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Spiffy Color 1
Volume Number:6
Issue Number:11
Column Tag:Color Workshop

Related Info: Color Quickdraw Memory Manager

Spiffy Color Demo

By John A. Love, III, Springfield, VA

Note: Source code files accompanying article are located on MacTech CD-ROM or source code disks.

Spiffy Color Effects Demo

Part I

[John is a member of theWashington Apple Pi Users’ Group from the greater Washington D.C. metropolitan area and can be reached on Applelink {D3471} and on GEnie {J.LOVE7}]

Although the application file on the MacTutor disk is named “Rotation Demo”, the color effects illustrated are more inclusive, as follows:

a) Rotation.

b) Dissolve.

c) Text Scrolling & Un-Rolling. Select the “About ...” Menu item to observe these.

d) PICT/PICT2 scrolling.

e) Just for hex, press “z” or “Z” and enjoy!!

In addition, you’ll observe color menus, color windows, color icons, color Scroll Bars, color CuRSoRs and rotating CURSors (sorry, the latter are in “yucky” black-and-white). Found the hidden treasure(e) in the source listing yet-- I know it’s old stuff to some of you, but I’m still fascinated by it. Finally, you’ll listen to the joyous sound of Macintosh Developer Tech Support’s (MacDTS) mascot, DogCow™. All of this is in a MultiFinder™-aware demo package.

By the way, this daggum demo has successfully run on a:

• Mac IIx with Apple’s standard color monitor

• Mac IIci with Raster Op’s monitor & their 24-bit color card { will miracles never cease ????? }

• MacIIci mated with Radius’ Two Page Display and Apple’s standard color monitor, with my window entirely on one or the other. Pleeeeese don’t ask about my window overlapping both !!!!!

• I’m still looking for some rich soul with a Mac IIfx

I wrote this demo using Symantec’s THINKPascal© {Version 3.Ø} in conjunction with my all-time favorite assembler, “McAssembly©”, authored by Dave McWherter and formerly distributed by Signature Software. Followers of MacTutor may recall an article of mine in April, 1989, wherein I described “McAssembly©” in reasonable detail. Dave also authored a super text-processing DA, Vantage™, distributed by Preferred Publishers, which I also talked about in that same article.

As a programmer, I have only one regret; namely, I have just received Version 3.Ø of THINKPascal© which is MacApp™-compatible. I am still learning MacApp™ so I wrote the demo in the procedural mode. Since it is now April, maybe by the time this article is printed, I will feel more at ease with MacApp™.

Speaking of MacApp™, if you’re just beginning to program using MacApp™ or are thinking of starting but the thought scares ‘the-heck-out-of-you’ because of its reported complexity, I whole-heartedly suggest you get the following docs from APDA:

a) Introduction to MacApp v. 2.0 and Object-Oriented- Programming, Beta Draft

b) MacApp v. 2.0 Tutorial, Beta Draft

c) MacApp v. 2.0 Cookbook, Beta Draft

They are really excellent!!! They cover the waterfront, yet adhere to the KISS principle.

Before I progress to some of the programming goodies, let me say that beyond any doubt whatsoever, I would never have ‘gotten to first base’ without the patient assists of Mr. Jon Zap from MacDTS. His tutorials via Applelink™ were superb. In addition, take a gander at some of Mr. SkippyWhite’s great off-screen device code on “Phil and Dave’s Excellent CD”. Because I relied principally on off-screen pixmaps, vice off-screen devices, I used only a tiny portion of Skippy White’s code. ‘How-some-ever’, I learned a heck-of-a-lot. Good stuff ... Thanks Jon & Skippy!!!!!

Before I end this thing, I would like to share with you some of my findings while working in the color world. I’ll try to be brief simply because by the time the source listings end below, Kirk Chase will be ready to kill me:

Color Controls

Some wierd goings-on here as described in the following code-segment in my “UpActionProc”:

{1}

newCtlValue := oldCtlValue - 1;    { Decrement 1 line }
{ _SetCtlValue appears buggy for a Mac II set to black-and- }
{ white.  Works okay in color, though ?????                 }
temp := ctl^^.contrlRect;
InsetRect(temp, 1, 1);
ClipRect(temp);
SetCtlValue(ctl, newCtlValue);
ClipRect(ctl^^.contrlOwner^.portRect); { Reset. }

Actually the above craziness is necessary anytime I call _SetCtlValue or something comparable such as _SetCtlMax; for example, in my “DoPeriodic” PROC wherein I look to see if the ctlMax needs to be reset which it must be when I either resize the window or zoom it. Please don’t ask me why this craziness is required!!!!! By the way, my scrolling code is simply Dan Weston’s Assembly code converted to Pascal (see his positively super two book series about programming in Assembly).

Color Menus

Nothing fancy here. I simply used RMaker™ to construct a “mctb” resource with ID=0 because that is the resource loaded when _InitMenus is executed. Within this resource, the so-called menubar entry led, followed by the appropriate exceptions to this menubar entry; for example, a particular menu title or a particular menu item. Without these exceptions, the leading menubar entry takes care of the whole thing.

I suppose I could have constructed “mctb” resources for each individual menu, with matching IDs. These resources are loaded by _GetMenu. However, since the effect for my particular demo is the same, I chose the “ID=0” approach.

Rotation in Color

I used John Olsen’s bit rotation scheme as originally published in MacTutor (February,1988). John’s code was in Assembly language, so I continued his example. Its conversion to color turned out to be a bear because I kept getting bus errors. There is nothing fancy about its conversion to color -- simply rotate pixels, rather than bits.

Dissolve in Color

I used Mike Morton’s dissolve scheme that he wrote in Assembly language and originally published in MacTutor (December,1985). Dig up this oldie and track down Mike’s subroutine that he entitles “Convert” and that’s the only place that multiple bits-per-pixel enter the picture. It took me longer to find that ‘antique’ issue of MacTutor than it did to implement the required changes.

Scrolling PICTs ...

Just to convey some idea of the speed & resultant efficiency of creating and using off-screen bitmaps/pixmaps, the following code could have been used to scroll the PICT drawn in the content region of the active window in response to a mouseDown Event in one of its scroll bars:

{2}

PROCEDURE ScrollContents (ctl: ControlHandle; dh, dv: INTEGER);
 VAR
  window: WindowPtr;
  oldClip: RgnHandle;
  myPic: PicHandle;
BEGIN
 window := ctl^^.contrlOwner;  { We KNOW this is the GrafPort.}
 oldClip := NewRgn;
 GetClip(oldClip);
{ I placed it here, vice in the windowPic field--so sue me. }
 myPic := PicHandle(WindowPeek(window)^.refCon);
 ;
 ClipRect(windPICTrect);  { These rects are globals. }
 EraseRect(windPICTrect);
 OffsetRect(scrolledFullPICTrect, dh, dv);
 DrawPicture(myPic, scrolledFullPICTrect);
 ;
 SetClip(oldClip);
 ValidRect(windPICTrect); { NO updates please !! }
 DisposeRgn(oldClip);
END;   { ScrollContents }

This works; however, the effects of _EraseRect are visible. In short, as you scroll the PICT, the image blinks ... even on a MacII set to black-and-white. The method of choice then becomes creating an off-screen bitmap/pixmap, scrolling it off-screen and finally _CopyBits-ing it on-screen. Granted ... in color the PICT does blink, but only slightly and in black-and-white on a MacII there is no blinking that I can discern, anyway.

Zooming a window in response to a keypress

This last ‘goodie’ has nothing to do with strictly color, but applies also to black-and-white. “Inside Macintosh”, Volume IV, stipulates that “ZoomWindow is in no way tied to the TrackBox function...”. Neat!! So, take a gander:

{3}

 PROCEDURE HandleKey;
  VAR
   keyASCII: INTEGER;
   key: char;
 BEGIN
  IF NOT applWind THEN     
   EXIT(HandleKey);
  ;
  IF BitAnd(Event.modifiers, $0F00) = cmdKey THEN { ONLY the Command 
Key }
   HandleMenu
  ELSE
  BEGIN
   keyASCII := BitAnd(Event.message, CharCodeMask);
   key := CHR(keyASCII);
   IF (key = ‘z’) | (key = ‘Z’) THEN     
    doZoom(FrontWindow, nextState) { More on “nextState” below. }
   ELSE
    SysBeep(10);
  END;   { ELSE no leading Command key }
 END;   { HandleKey }

The key is to keep your ‘doZoom’ PROC separate so your ‘HandleMouse’ PROC looks something like:

{4}

 PROCEDURE HandleMouse;
  VAR
   ...
 BEGIN
  CASE windowLoc OF   { windowLoc + others below = Globals }
   ...
   inZoomOut, inZoomIn:
    IF TrackBox(TheWindow, Event.where, windowLoc) THEN
     doZoom(TheWindow, windowLoc);
   ...
  END;   { CASE }
 END;   { HandleMouse }

But ... (there’s always one!! in every crowd) ... I’ve got to determine what ‘state’ the window is currently in, the userState that depicts the to-be-zoomed-out state or the stdState that depicts the to-be-zoomed-in state. Well, that part’s easy--my “nextState” global (see my HandleKey PROC above) is:

a) initialized to inZoomOut upon start--up.

b) set to inZoomOut at the end of my windowLoc: inZoomIn code.

c) set to inZoomIn at the end of my windowLoc: inZoomOut code.

d) set to inZoomOut at the end of my ‘doGrow’ PROC.

The real rub comes within the windowLoc = ‘inDrag’ part of my ‘HandleMouse’ PROC:

{6}

 inDrag: 
 BEGIN
  ...
{ DragWindow forces the Mouse to stay inside of tempRect }
{ which has already been quantified                      }
  DragWindow(TheWindow, Event.where, tempRect);

{ The following craziness ????? is required ’cause I zoom  }
{ the window in response to a keypress. I call SizeWindow  }
{ with NO effective change just to re-quantify the user    }
{ State in the WStateRec(ord.                              }

   WITH TheWindow^.portRect DO
    SizeWindow(TheWindow, right - left, bottom - top, FALSE); { NO update 
!! }

       GetMouse(mouseLoc);
    LocalToGlobal(mouseLoc);
    IF PtInRect(mouseLoc, tempRect) THEN
 { It’s a drag, allright !! }
        nextState := inZoomOut;
  { ELSE NO change !! }

 END;   { inDrag }

Color CuRSoRs

Color Cursors are wierd, just plain wierd. In the black-and-white world, the call to change the Cursor is always to the ROM pair, _GetCursor and _SetCursor. Watch out, color

a) _GetCCursor once and only upon an Activate/Resume Event.

b) _DisposCCursor upon a DeActivate/Suspend Event.

c) _SetCCursor when your _PtInRect call returns TRUE but also set a flag, to whit:

{7}

IF NOT stillColorCrsr AND PtInRect( ) THEN
BEGIN
 SetCCursor(yourCrsrHdl);
 stillColorCrsr := TRUE;
END;

As I said, ‘Watch Out!!!

Just in case the sub-title of this article failed to catch your eye, namely the “Part I”, there’s something deliberately missing from this month’s article due to length restrictions. That which is missing is ALL the assembly source code and the “RMaker” source code your patience will be rewarded next month.

Figured out the treasure hidden in (e) yet ... if not, read on, for the source now begins:

Listing:  rotInterface.p

UNIT rotInterface;

INTERFACE

{ ----------------------}
{ Memory Manager stuff: }
{ ----------------------}

 FUNCTION NewClearHandle (logicalSize: Size): Handle;
 INLINE

{ The PASCAL-supplied interface is             }
{ denoted with "***":                          }
{                                              }
{ ***   subq.w    #4,sp             }
{ ***   move.l    logicalSize,-(sp) }
{ $201F:move.l    (sp)+,d0          }
{ $A322:  _NewHandle,clear            }
{ $31C00220:move.w    d0,MemErr         }
{ $2E88:move.l    a0,(sp)           }
{ ***   move.l    (sp)+,xxxx        }

 $201F, $A322, $31C0, $0220, $2E88;

FUNCTION NewSysHandle (logicalSize: Size): Handle;
INLINE
 $201F, $A522, $31C0, $0220, $2E88;


FUNCTION NewSysClearHandle (logicalSize: Size): Handle;
INLINE
 $201F, $A722, $31C0, $0220, $2E88;

FUNCTION NewClearPtr (logicalSize: Size): Ptr;
INLINE
 $201F, $A31E, $31C0, $0220, $2E88;
FUNCTION NewSysPtr (logicalSize: Size): Ptr;
INLINE
 $201F, $A51E, $31C0, $0220, $2E88;

FUNCTION NewSysClearPtr (logicalSize: Size): Ptr;
INLINE
 $201F, $A71E, $31C0, $0220, $2E88;

{ ------------------ }
{ Keeping A5 around: }
{ ------------------ }

 PROCEDURE PushA5; 
 INLINE
 $2F0D;               { MOVE.L A5,-(SP) }

 PROCEDURE PopA5;
 INLINE
 $2A5F;               { MOVE.L (SP)+,A5 }

{ will point to our parmeter block.  Therefore, the value    }
{ of CurrentA5 that we stored will be at - 4(A0).            }       
         

 PROCEDURE GetMyA5;
 INLINE
 $2A68, $FFFC; { MOVE.L -4(A0),A5 }

{ ---------------------------------------------------- }
{ Assembly Language routines }
{ -> in “rotAsm.Lib”:        }
{ ---------------------------------------------------- }

 FUNCTION RotateBits (srcBits, dstBits: BitMap): OSErr;

 PROCEDURE DissBits (srcBits, dstBits: BitMap; srcRect, dstRect: Rect);

IMPLEMENTATION

 FUNCTION RotateBits (srcBits, dstBits: BitMap): OSErr;
 external;

 PROCEDURE DissBits (srcBits, dstBits: BitMap; srcRect, dstRect: Rect);
 external;

END.   { UNIT = rotInterface }
Listing:  rotGlobals.p

UNIT rotGlobals;

INTERFACE
 USES
 Palettes;

{ --------------------------------- }
{ Global constants: }
{ --------------------------------- }

 CONST
 SP = ' ';
 CurrentA5 = $904;   { low-mem globals... }
 GrayRgn = $9EE;     { Handle to region drawn as desktop. }
 ROM85Loc = $28E; 
 mBarHeightLoc = $BAA;

 AppleMenuID = 1001;   { My specific constants ... }
 AboutItem = 1;
 AdisabledItem = 2;

 EditMenuId = 1002;
 UndoItem = 1;
 EdisabledItem = 2;
 CutItem = 3;
 CopyItem = 4;
 PasteItem = 5;
 ClearItem = 6;

 GraphicsMenuID = 1003;
 RotateItem = 1;
 DissolveItem = 2;
 GdisabledItem = 3;
 QuitItem = 4;

 monsterID = 128;       { PICTs ... }
 bwGigantorID = 129;
 colorGigantorID = 130;
 logoID = 131;

 acurWorld = 128;   { Rotating CURSors... }
 acurDogCow = 129;

 mainWindowID = 128;
 horizScrollID = 128;   { ... also, the CNTL’s refCon. }
 vertScrollID = 129;
 growBoxSize = 15;
 scrollWidth = 16;      { Samo-Samo }
 scrollHeight = 16;
  { ---------- }
 logoWindowID = 129;

 pmWhite = 0;  {Palette Mgr stuff...}
 pmBlack = 1;
 pmYellow = 2;
 pmMagenta = 3;
 pmRed = 4;
 pmCyan = 5;
 pmGreen = 6;
 pmBlue = 7;
 pmLtBlue = 8;
 pmLtGray = 9;

 IACScicnID = 128;
 HANDcrsrID = 129;

{ -------------------------------------------------------------------------------------------------------------- 
}
{ ... for Error handling in my Off-screen map routine(s): }
{ -------------------------------------------------------------------------------------------------------------- 
}

 NewPtrError = -10000;
 NewHdlError = -15000;
 CloneHdlError = -20000;
 MaxDevError = -25000;

{ ------------------------------------ }
{ MultiFinder stuff: }
{ ------------------------------------ }

 _WaitNextEvent = $A860;
 _Unimplemented = $A89F;
 SysEnvironsVersion = 1;

{ OSEvent is the event number of the suspend/resume and   }
{ mouse-moved Events sent by MultiFinder.  Once you       } 
{ determine that an event is an OSEvent, look at the High }
{ byte of the message sent with the event to determine    } 
{ which kind it is.  To differentiate between suspend &   }
{ resume, look at resumeMask bit.                         }

 OSEvent = app4Evt;
 suspendResumeMessage = 1;
 mouseMovedMessage = $FA;
 resumeMask = 1;
{ -------------------------- }
{ Global types: }
{ -------------------------- }

 TYPE
 RgnHandlePtr = ^RgnHandle;
 wordPtr = ^INTEGER;
 longPtr = ^LONGINT;
 BitMapPtr = ^BitMap;

 MyVBLType = RECORD
 CurrA5: LONGINT; { Lost & Found!! }
 MyVBL: VBLTask; { The actual Task }
 END;   { MyVBLType }

 acurType = RECORD {Poetry in motion!!}
 nbrCursors: INTEGER;
 frameCounter: INTEGER;
 cursorIDs: ARRAY[0..0] OF LONGINT;  {in High word. }
 END;   { acurType }
 acurPtr = ^acurType;
 acurHandle = ^acurPtr;

 WStatePtr = ^WStateData;   { For zooming the window in }
 WStateHdl = ^WStatePtr;    { response to a keypress. }

{ -------------------------------------- }
{ Global variables:   }
{ -------------------------------------- }

 VAR
 screen: Rect;
 ROM: wordPtr;
 mBarHt: INTEGER;
 AppleMenu, EditMenu, GraphicsMenu: MenuHandle;
 aMac2: BOOLEAN;
 colorDepth: INTEGER;
 monsterPicHdl: PicHandle;
 fullPICTrect, windPICTrect: Rect;
 TheWindow: WindowPtr;
 windDef: INTEGER; { Variation Code }
 horizControl, vertControl: ControlHandle;
 Event: EventRecord;
 windowLoc: INTEGER;
 daWind, applWind: BOOLEAN;
 currEdit, currGraphics: BOOLEAN;
 myVBLRec: MyVBLType;
 acurHdl: Handle;
 CURS_ID0, nbrGlobe: INTEGER;
 Done, InWindow: BOOLEAN;
 WNE, InForeGround, justOpened, justBragging: BOOLEAN;
 Sleep, finalTicks: LONGINT;
 colorHandCrsr: CCrsrHandle;
 stillColorCrsr: BOOLEAN;
 CreateOffScreenError: OSErr; { usual off-screen stuff  }
 oldDevice, myMaxDevice: GDHandle;
 offBitMapPtr, onScreenBitsPtr: BitMapPtr;
 myBits: Ptr;
 offGrafPort: GrafPort;
 offGrafPtr, onBWScreen: GrafPtr;
 offCGrafPort: CGrafPort;
 offCGrafPtr, onCScreen: CGrafPtr;
 ourCTHandle: CTabHandle;
 scrolledFullPICTrect: Rect;  { For scrolling. }
 zoomBackIn: Rect;            { For zooming ... }
 nextState: INTEGER;
 stateHandle: WStateHdl;
 saveWindPICTrect, saveFullPICTrect, 
 saveScrolledFullPICTrect: Rect;

IMPLEMENTATION

END.   { UNIT = rotGlobals }
Listing:  rotMiscSubs.p

UNIT rotMiscSubs;

INTERFACE
 USES
 Palettes, Retrace, Sound, rotInterface, rotGlobals;

 PROCEDURE InitManagers;
 FUNCTION TestForMac2: BOOLEAN;
 FUNCTION TestForColor: INTEGER;
 PROCEDURE LocalGlobal (VAR r: Rect);
 PROCEDURE GlobalLocal (VAR r: Rect);
 FUNCTION WNEisImplemented: BOOLEAN;
 PROCEDURE PlaySound (mySound: Str255);
 PROCEDURE InstallVBLTask (rsrcID: INTEGER);
 PROCEDURE RemoveVBLTask;
 FUNCTION GetMouseMovement (gMouse0: Point): Size;
 FUNCTION DoubleClick: BOOLEAN;

IMPLEMENTATION

 PROCEDURE FatalSystemCrash;
 BEGIN
 ExitToShell;
 END;   { FatalSystemCrash }

 PROCEDURE InitManagers;
 BEGIN
 MoreMasters;
 MoreMasters;
 MoreMasters;
 MoreMasters;
 InitGraf(@thePort);
 InitFonts;
 InitWindows;
 InitMenus;
 TEInit;
 InitDialogs(@FatalSystemCrash);
 ;
 FlushEvents(everyEvent, 0);
 InitCursor;
 END;   { InitManagers }

{ ============================================== }
{ Test for a Mac II, or an SE30 for that matter: }
{ ============================================== }

 FUNCTION TestForMac2: BOOLEAN;

 VAR
 theWorld: SysEnvRec;
 error: OSErr;

 BEGIN
 TestForMac2 := FALSE;   { Assume the old stuff !! }

 error := SysEnvirons(1, theWorld);
 IF error <> 0 THEN
 EXIT(TestForMac2);
 IF theWorld.machineType >= envMacII THEN
 TestForMac2 := TRUE;
 END;  { TestForMac2 }

{ ======================================================== }
{ Test for the presence of a Mac with Color QuickDraw and  }
{ a Color Monitor set to Color via the Control Panel or    } 
{ using the “Switch-A-Roo” FKEY.  Return the color depth:  } 
{ ======================================================== }

 FUNCTION TestForColor: INTEGER;

 LABEL
 100;
 VAR
 theWorld: SysEnvRec;
 error: OSErr;

 BEGIN
 TestForColor := 1;{ Assume B&W }

 error := SysEnvirons(1, theWorld);
 IF error <> 0 THEN
 EXIT(TestForColor);
 IF NOT theWorld.hasColorQD THEN
 GOTO 100;
 TestForColor := GetGDevice^^.gdPMap^^.pixelSize;

100:
 END;  { TestForColor }

{ =================== }
{ A short-cut or two: }
{ =================== }
 PROCEDURE LocalGlobal (VAR r: Rect);
 BEGIN
 LocalToGlobal(r.topLeft);
 LocalToGlobal(r.botRight);
 END;   { LocalGlobal }

 PROCEDURE GlobalLocal (VAR r: Rect);
 BEGIN
 GlobalToLocal(r.topLeft);
 GlobalToLocal(r.botRight);
 END;   { GlobalLocal }

{ =================================== }
{ Common to the routines that follow: }
{ =================================== }

 FUNCTION TrapAvailable (myTrapNbr: INTEGER; myTrapType:
 TrapType): BOOLEAN;
 VAR
 UnimplementedTrapNbr: INTEGER;

 BEGIN
 { LONGINT -> INTEGER }
 UnimplementedTrapNbr := LoWord(BXOR(_Unimplemented, $A800)); 
 TrapAvailable := (NGetTrapAddress(myTrapNbr, myTrapType) <> GetTrapAddress(UnimplementedTrapNbr));
 END;  { TrapAvailable }

{ ============================================== }
{ Check to see if _WaitNextEvent is implemented: }
{ ============================================== }

 FUNCTION WNEisImplemented: BOOLEAN;

 VAR
 WNEtrapNbr: INTEGER;
 theWorld: SysEnvRec;
 discardError: OSErr;

 BEGIN
 WNEtrapNbr := LoWord(BXOR(_WaitNextEvent, $A800));

{ Since _WaitNextEvent and _HFSDispatch have the same trap }
{ number ( = $60 ), we can call “TrapAvailable” for        }
{ _WaitNextEvent ONLY if we are on a machine that supports }
{  separate OS and ToolBox trap tables.  Therefore, we     }
{ need to check for a machineType that is >= 0.  NOTE that }
{ even if we get an error calling _SysEnvirons, the        }
{ compiler’s glue has filled-in the machineType field:     }         
         
 discardError := SysEnvirons(SysEnvironsVersion, theWorld);
 IF theWorld.machineType < 0 THEN
 WNEisImplemented := FALSE
 ELSE
 WNEisImplemented := TrapAvailable(WNEtrapNbr, ToolTrap);
 END;  { WNEisImplemented }


{ ===================== }
{ Play it again, Sam !! }
{ ===================== }

 PROCEDURE PlaySound (mySound: Str255);
 CONST
 _SndPlay = $A805;
 VAR
 SndPlayTrapNbr: INTEGER;
 theWorld: SysEnvRec;
 discardError: OSErr;
 SndPlayIsImplemented: BOOLEAN;
 sndHandle: Handle;
 BEGIN
 SndPlayTrapNbr := LoWord(BXOR(_SndPlay, $A800));
 discardError := SysEnvirons(SysEnvironsVersion, theWorld);
 IF theWorld.machineType < 0 THEN
 SndPlayIsImplemented := FALSE
 ELSE
 SndPlayIsImplemented := TrapAvailable(SndPlayTrapNbr, ToolTrap);
 ;
 sndHandle := GetNamedResource(‘snd ‘, mySound);
 IF NOT SndPlayIsImplemented | (sndHandle = NIL) THEN
 EXIT(PlaySound);

 discardError := SndPlay(NIL, sndHandle, FALSE);
 END;  { PlaySound }

{ ======================== }
{ My spinning CURSor Task: }
{ ======================== }
 PROCEDURE SpinTheBottle; { Love it !!! }
 VAR
 globe: cursHandle;
 globeID: INTEGER;
 BEGIN
 PushA5;
 GetMyA5;

 globeID := CURS_ID0 + nbrGlobe - 1;
 globe := GetCursor(globeID);
 SetCursor(globe^^);

 nbrGlobe := nbrGlobe - 1;   { Reset stuff for next time  }

 IF nbrGlobe = 0 THEN
 nbrGlobe := acurHandle(acurHdl)^^.nbrCursors;
 
 myVBLRec.MyVBL.vblCount := 10;

 PopA5;
 END;   { SpinTheBottle }

{ ============================= }
{ Round-and-around she goes ... }
{ ============================= }
 PROCEDURE InstallVBLTask (rsrcID: INTEGER);
 VAR
 watch: cursHandle;
 ignore: INTEGER;

 BEGIN
 acurHdl := GetResource(‘acur’, rsrcID);
 IF acurHdl = NIL THEN
 BEGIN
 watch := GetCursor(watchCursor);
 SetCursor(watch^^);    { Reset later by HandleCursor. }
 END   { IF acurHdl = NIL }
 ELSE
 BEGIN
 CURS_ID0 := HiWord(acurHandle(acurHdl)^^.cursorIDs[0]);
 nbrGlobe := acurHandle(acurHdl)^^.nbrCursors;
 ;
 WITH myVBLRec, MyVBL DO
 BEGIN
 CurrA5 := longPtr(CurrentA5)^;
 vblAddr := @SpinTheBottle;
 vblCount := 10;   { Six times every second. }
 qType := ORD(vType);
 vblPhase := 0;
 END;   { WITH }
 
 ignore := VInstall(@myVBLRec.MyVBL);
 END;   { ELSE }
 END;   { InstallVBLTask }

 PROCEDURE RemoveVBLTask;
 VAR
 ignore: INTEGER;
 BEGIN
 IF acurHdl <> NIL THEN
 ignore := VRemove(@myVBLRec.MyVBL);
 acurHdl := NIL;      { Mark as gone. }

   { CURSor reset later by “HandleCursor”.}
 Sleep := 1;   { ... so above happens under MultiFinder. }
 
 stillColorCrsr := FALSE;   { See “HandleCursor”. }
 END;   { RemoveVBLTask }

{ ===================================================== }
{ Returns vertical movement in High word and horizontal }
{ movement in low word, similar to _GrowWindow.         }
{                                                       }
{ Note the input Point is in GLOBAL coordinates.        }
{ Otherwise, dragging a window will return 0 movement.  }
{ ===================================================== }


 FUNCTION GetMouseMovement (gMouse0: Point): Size;
 VAR
 mouseLoc: Point;
 mouseDH, mouseDV: INTEGER;
 sizeMove: Size;
 BEGIN
 GetMouse(mouseLoc);
 LocalToGlobal(mouseLoc);
 mouseDH := mouseLoc.h - gMouse0.h;
 mouseDV := mouseLoc.v - gMouse0.v;
 IF mouseDH < 0 THEN  { Abs vals   }
 mouseDH := -mouseDH;
 IF mouseDV < 0 THEN
 mouseDV := -mouseDV;
 
 sizeMove := mouseDV;
 sizeMove := BSL(sizeMove, 16); 
 sizeMove := sizeMove + mouseDH;
 GetMouseMovement := sizeMove;
 END;   { GetMouseMovement }

{ ================================= }
{ Note that the algorithm I used    }
{ returns FALSE if we are dragging. }
{ ================================= }

 FUNCTION DoubleClick: BOOLEAN;
 VAR
 startTime, endTime, doubleTime: LONGINT;
 mouseLoc0: Point;
 sizeMove: Size;
 BEGIN   { DoubleClick }
 DoubleClick := FALSE; {Assume Nada!!}
 doubleTime := GetDblTime;

   startTime := TickCount;   { Initial time. }
 endTime := startTime;
 GetMouse(mouseLoc0);      { Initial mouse location. }
 LocalToGlobal(mouseLoc0);

 WHILE StillDown & ((endTime - startTime) <= doubleTime) DO { 1st mouse 
click. }
 endTime := TickCount;  { Times out if dragging ... }

 sizeMove := GetMouseMovement(mouseLoc0);
 
 WHILE ((endTime - startTime) <= doubleTime) & (LoWord(sizeMove) <= 5) 
& (HiWord(sizeMove) <= 5) DO
 BEGIN
 IF Button THEN
 BEGIN
 DoubleClick := TRUE; { 2nd time’s a charm !! }
 Leave;
 END;   { IF Button }
 
 endTime := TickCount;
 sizeMove := GetMouseMovement(mouseLoc0);
 END; { WHILE small delta Time AND small delta movement}
 END;   { DoubleClick }

END.   { UNIT = rotMiscSubs }


Listing:  OffscreenSubs.p

{ -------------------------------------------------------------------------- 
}
{ From: Apple MacDTS                    }                     
{                                       }
{ Some of “Skippy White’s Famous High   } 
{ Level Off-Screen Map Routines”        }
{                                       }
{ These routines provide a high-level   } 
{ interface to the QuickDraw & Color    }
{ Manager routines which allow the      }
{ creation and manipulation of          }
{ off-screen bitmaps and pixmaps. They  } 
{ are designed to run on any machine    } 
{ with  128K or later ROMs.             }
{                                       }
{ NOTE that I’ve modified some of       }
{ Skippy’s routines and, therefore, any } 
{ resultant errors in syntax or logic   }      
{ belong solely to me.                  }
{ -------------------------------------------------------------------------- 
}

UNIT OffscreenSubs;

INTERFACE
 USES
 rotInterface, rotGlobals, rotMiscSubs;

 FUNCTION GetMaxAreaDevice (globalRect: Rect): GDHandle;
 FUNCTION CreateOffScreen (VAR myRect: Rect): OSErr;
 PROCEDURE ToOnScreen;
 PROCEDURE DisposOffScreen;

IMPLEMENTATION

{ ********** }
 FUNCTION GetMaxAreaDevice (globalRect: Rect): GDHandle;
{ Find largest overlap device for given global rectangle. } 
        
 VAR
 area: LONGINT;
 maxArea: LONGINT;
 device: GDHandle;
 intersection: Rect;

 BEGIN
 GetMaxAreaDevice := NIL;
 maxArea := 0;
 device := GetDeviceList;
 WHILE device <> NIL DO
 BEGIN
 IF TestDeviceAttribute(device, screenDevice) THEN
 IF TestDeviceAttribute(device, screenActive) THEN

 IF SectRect(globalRect, device^^.gdRect, intersection) THEN
 BEGIN
 WITH intersection DO
 area := LONGINT(right - left) * LONGINT(bottom - top);
 IF area > maxArea THEN
 BEGIN
 GetMaxAreaDevice := device;
 maxArea := area;
 END;   { IF area > maxArea }
 END;   { IF SectRect ... }

 device := GetNextDevice(device);
 END;   { WHILE device <> NIL }

 END;   { GetMaxAreaDevice }

{ ************************************* }
{ For scrolling & other nifty stuff ... }
{ ************************************* }
 FUNCTION CreateOffScreen (VAR myRect: Rect): OSErr;
{ Reference: Tech Note #120                            }
{ with special thanks to Jon Zap of MacDTS            }
{ NOTE: Local window coords are input but local screen }
{ coordinates are returned for drawing purposes.       }

 VAR
 offRowBytes: LONGINT;
 sizeOfOff: LONGINT;
 localRect, globRect: Rect;
 i, maxDepth: INTEGER;
 err: OSErr;

 PROCEDURE ErrorOut (error: OSErr);
 BEGIN
 CreateOffScreen := error;
 EXIT(CreateOffScreen);
 END;   { ErrorOut }

 BEGIN   { CreateOffScreen }
 CreateOffScreen := noErr;

 globRect := myRect; 
   { We’re about to switch the Port to off-screen: }
 LocalGlobal(globRect);

 IF colorDepth = 1 THEN
 BEGIN
 offGrafPtr := @offGrafPort;
 OpenPort(offGrafPtr);
 maxDepth := 1;
 END   { IF colorDepth = 1 }

 ELSE

 BEGIN
 myMaxDevice := GetMaxAreaDevice(globRect);
 IF myMaxDevice = NIL THEN
 ErrorOut(MaxDevError);
 
 oldDevice := GetGDevice;
 SetGDevice(myMaxDevice);
 
 offCGrafPtr := @offCGrafPort;  { Initialize this guy. }
 OpenCPort(offCGrafPtr);
 maxDepth := offCGrafPtr^.portPixMap^^.pixelSize;
 END;   { ELSE: colorDepth > 1 }
{ Before we do ANYthing more, we set the off-screen’s  }
{ visRgn to the FULL size of the input rect so the     } 
{ image stays whole if the window has been dragged     }
{ partly beyond the physical edge(s) of the screen.    } 
{ Otherwise, the visRgn^^.rgnBBox in local coordinates }
{ remains equal to screenBits.bounds as inited when    }
{ _Open(C)Port was called:                             }

 IF colorDepth > 1 THEN
 RectRgn(offCGrafPort.visRgn, globRect)
 ELSE
 RectRgn(offGrafPort.visRgn, globRect);

 localRect := globRect;
 GlobalLocal(localRect);

 WITH localRect DO
 BEGIN
 offRowBytes := (maxDepth * (right - left) + 15) DIV 16;   { # of words. 
}
 IF ODD(offRowBytes) THEN          {Made even.}
 offRowBytes := offRowBytes + 1;
        offRowBytes := offRowBytes * 2;    { Back to bytes. }
 sizeOfOff := LONGINT(bottom - top) * offRowBytes;
 END;   { WITH }

 myBits := NewClearPtr(sizeOfOff);  { Allocate space for the pixel image.}
 IF MemError <> noErr THEN
 ErrorOut(NewPtrError);

{ NOTE that we’re filling in the BitMap/PixMap fields of }
{ the new Port directly, so we do NOT call _ SetPortBits }
{ or _SetCPortPix later:   }

 IF colorDepth > 1 THEN
 BEGIN
 WITH offCGrafPtr^.portPixMap^^ DO
 BEGIN
 baseAddr := myBits;
 rowBytes := offRowBytes + $8000; { Be a PixMap. }
 bounds := localRect;
 END;   { WITH }

 offBitMapPtr := BitMapPtr(offCGrafPtr^.portPixMap^);
 END   { IF colorDepth > 1 }

 ELSE   { “Yucky” black-and-white. }

 BEGIN
 WITH offGrafPtr^.portBits DO
 BEGIN
 baseAddr := myBits;
 rowBytes := offRowBytes;
 bounds := localRect;
 END;

 offBitMapPtr := @offGrafPtr^.portBits;
 END;

 IF colorDepth > 1 THEN
 BEGIN

{ Next, we clone the color table of the maxDevice }
{ and put it into our off-screen pixel map.       }

 ourCTHandle := myMaxDevice^^.gdPMap^^.pmTable;
 err := HandToHand(Handle(ourCTHandle));

 IF err <> noErr THEN
 ErrorOut(CloneHdlError);

 FOR i := 0 TO ourCTHandle^^.ctSize DO
 ourCTHandle^^.ctTable[i].value := i;
{ The following is required to convert }
{ GDevice cluts to Pixmap cluts.       }

 ourCTHandle^^.ctFlags:= 
BAND(ourCTHandle^^.ctFlags, $7FFF);
 ourCTHandle^^.ctSeed := GetCTSeed;
 offCGrafPtr^.portPixMap^^.pmTable := 
ourCTHandle;      { --> the off-screen map. }

 END;   { IF colorDepth > 1 }

 myRect := localRect;  { Return local screen coordinates.}

  END;   { CreateOffScreen }

{ ******************* }
{ Back to “Square 1”: }
{ ******************* }

 PROCEDURE ToOnScreen;

 BEGIN
 IF colorDepth > 1 THEN
 BEGIN
 GetCWMgrPort(onCScreen);
 SetPort(GrafPtr(onCScreen));
 SetGDevice(oldDevice);
 onScreenBitsPtr := BitMapPtr(onCScreen^.portPixMap^);
 END   { IF colorDepth > 1 }

 ELSE

 BEGIN
 GetWMgrPort(onBWScreen);
 SetPort(onBWScreen);
 onScreenBitsPtr := @onBWScreen^.portBits;
 END;   { ELSE = “Yucky” black-and-white }

 END;   { ToOnScreen}

{ **************************** }
{ Out with the new.            }
{ Whoops -- I meant the old !!  }
{ **************************** }

 PROCEDURE DisposOffScreen;

 LABEL
 100, 200;

 BEGIN

 IF CreateOffScreenError = MaxDevError THEN
 EXIT(DisposOffScreen)
 ELSE IF CreateOffScreenError = NewPtrError THEN
 GOTO 200
 ELSE IF CreateOffScreenError = CloneHdlError THEN
 GOTO 100;
  { noErr ... }
 IF colorDepth > 1 THEN
 DisposHandle(Handle(ourCTHandle));
100:
 DisposPtr(myBits);
200:
 IF colorDepth > 1 THEN 
 CloseCPort(offCGrafPtr)
 ELSE
 ClosePort(offGrafPtr);

 END;   { DisposOffScreen }

END. { UNIT = OffscreenSubs }

Continued in next frame
Volume Number:6
Issue Number:11
Column Tag:Color Workshop

Related Info: Color Quickdraw Memory Manager

Spiffy Color Demo (code)

By John A. Love, III, Springfield, VA


Listing:  rotScrollSubs.p

UNIT rotScrollSubs;          { Thanks, Dan Weston !!!!! }

INTERFACE
 USES
 Palettes, rotGlobals, rotMiscSubs, OffScreenSubs;

 PROCEDURE ScrollText (myText: QDPtr; box: Rect);
 PROCEDURE Scroll (ctl: ControlHandle; part: INTEGER; Pt: Point);
 FUNCTION DrawMyControl (ctl: ControlHandle): BOOLEAN;
 FUNCTION ScrollHoriz (windPtr: WindowPtr): ControlHandle;
 FUNCTION ScrollVert (windPtr: WindowPtr): ControlHandle;
 PROCEDURE ScrollShow (windPtr: WindowPtr);
 PROCEDURE ScrollHide (windPtr: WindowPtr);
 PROCEDURE InvalidScroll (windPtr: WindowPtr);
 PROCEDURE ValidScroll (windPtr: WindowPtr);
 PROCEDURE ScrollResize (windPtr: WindowPtr);
 PROCEDURE SetMaxCtls (windPtr: WindowPtr);
 PROCEDURE SetCtlsToMin (windPtr: WindowPtr);

 VAR
 window: WindowPtr;
 VertOrHoriz: LONGINT;
 oldCtlValue: INTEGER;
 stillThere: INTEGER;
 temp: Rect;

IMPLEMENTATION

{ ---------------------------------------------------------------------------------------- 
}
{ Scrolls your text string from right to left. }
{ ---------------------------------------------------------------------------------------- 
}
 PROCEDURE ScrollText (myText: QDPtr; box: Rect);

 LABEL
 100, 200, 300, 400, 500, 600;
 VAR
 myPort: GrafPtr;
 buffer: ARRAY[0..255] OF SignedByte;
 textBuf: QDPtr;
 boxWidth: INTEGER;
 leftJustify: BOOLEAN;
 x0, y0: INTEGER;
 widthSpace: INTEGER;
 textLen: SignedByte;
 bufWidth: INTEGER;
 firstChar: INTEGER;
 lastChar: INTEGER;
 charCount: INTEGER;
 finalTicks: LONGINT;

 BEGIN
 GetPort(myPort);
 ClipRect(myPort^.portRect);

 textLen := myText^;
 IF textLen = 0 THEN   { Null string. }
 EXIT(ScrollText);
 
 textBuf := QDPtr(ORD4(@buffer));
 { Include the length byte. }
   textLen := SignedByte(ORD(textLen) + 1);
 BlockMove(Ptr(myText), Ptr(textBuf), size(textLen));
 ;
 buffer[0] := textLen; { textLen = textLen + 1 from above.}
 { Add a trailing space. }
 buffer[ORD(textLen)] := SignedByte(SP);

 widthSpace := CharWidth(SP);
 WITH box DO
 BEGIN
 boxWidth := right - left;
 y0 := bottom - top;
 IF y0 < 10 THEN { NOT tall enough !! }
 EXIT(ScrollText);
 y0 := (y0 - 6) DIV 2;
 y0 := bottom - y0;  { y0 = bottom - 7 for box.tall=20 }
 END;
 leftJustify := FALSE;    { Assume right-justified text. }
 ;
 firstChar := 1; { Start AFTER length byte. }
 lastChar := 1;
 charCount := 1;

{ Scroll the text: }
100:
 bufWidth := TextWidth(textBuf, firstChar, charCount);

 IF bufWidth > boxWidth THEN       { Text does NOT fit !! }
 BEGIN
 firstChar := firstChar + 1;  { Drop 1st character and }
 charCount := charCount - 1;  { try for fit again.     }
 leftJustify := TRUE;
 GOTO 100;
 END;   { IF bufWidth > boxWidth }

{ it Fits }
200:
 EraseRect(box);
 x0 := box.right - bufWidth;
 IF x0 < box.left THEN 
 { Needed ONLY for very short strings. }
 leftJustify := TRUE;

 IF leftJustify THEN
 x0 := box.left;
   { y0 := box.bottom - 7; }
 MoveTo(x0, y0);
 DrawText(textBuf, firstChar, charCount);
 lastChar := lastChar + 1;

 IF lastChar <= ORD(textLen) THEN  
 { Haven’t reached end of string. }
 GOTO 400;

 IF leftJustify THEN   { We’ve reached the left edge. }
 GOTO 300;

{ Not to left edge yet. }

 bufWidth := bufWidth + widthSpace;
 Delay(10, finalTicks);   { ... otherwise too quick. }
 GOTO 200;

{ At left edge. }
300:
 firstChar := firstChar + 1;
 charCount := charCount - 1;
 IF charCount = 0 THEN    { All characters moved left. }
 GOTO 600;   { Fini !! }
 GOTO 500;

{ Next character. }
400:
 charCount := charCount + 1;   { Bump the length. }

500:
 Delay(10, finalTicks);   { ... otherwise too quick. }
 GOTO 100;   { Scroll again. }

{ Fini!! }
600:
 ValidRect(box); { No Updates, please }

 END;   { ScrollText }
{ -------------------------------------------------------- }
{ Scroll PICTure displayed in  }
{ the window’s content region: }
{ -------------------------------------------------------- }
 PROCEDURE ScrollContents (ctl: ControlHandle; dh, dv: INTEGER);
 VAR
 oldClip: RgnHandle;
 myPic: PicHandle;
 gWindPICTrect, kWindPICTrect, oldScrolledRect, newScrolledRect: Rect;
 BEGIN
 { GetPort(oldPort); -- we KNOW it’s the passed window. }
 { window := ctl^^.contrlOwner;                        }
 oldClip := NewRgn;
 GetClip(oldClip);
 myPic := PicHandle(WindowPeek(window)^.refCon);

 gWindPICTrect := windPICTrect;
 LocalGlobal(gWindPICTrect);
 oldScrolledRect := scrolledFullPICTrect;
 
 CreateOffScreenError := CreateOffScreen(oldScrolledRect);
 
 kWindPICTrect := gWindPICTrect;
 WITH screenBits.bounds DO    { See “DoRotate”. }
 OffsetRect(kWindPICTrect, left, top);

 IF CreateOffScreenError = noErr THEN
 BEGIN
 ClipRect(oldScrolledRect);   { Same ole stuff ... }
 EraseRect(oldScrolledRect);
 DrawPicture(myPic, oldScrolledRect);
 ;
 ToOnScreen;
 ;
 { Scrolling up & down the avenue. } 
 newScrolledRect := oldScrolledRect;
 OffsetRect(newScrolledRect, dh, dv);
 OffsetRect(scrolledFullPICTrect, dh, dv);   { ... for next time. }
 ;
 BackColor(whiteColor);
 ForeColor(blackColor);
 ClipRect(kWindPICTrect);
 EraseRect(kWindPICTrect);   { Erase old image. }
 CopyBits(offBitMapPtr^, onScreenBitsPtr^, oldScrolledRect, newScrolledRect, 
srcCopy, NIL);
 END;   { IF CreateOffScreenError = noErr }

 DisposOffScreen;

 SetPort(window);   { Re-group ... }
 SetClip(oldClip);
 ValidRect(windPICTrect);   { NO updates please !! }
 DisposeRgn(oldClip);

 END;   { ScrollContents }

{ ------------------------------------------------------------------------------------------------------------ 
}
{ Mouse clicked on the line arrows:                      }
{                                                        }
{ NOTE: As a matter of academic principle, avoid speed   }
{ penalities associated with TRAP overhead if possible.  }           
           { ------------------------------------------------------------------------------------------------------------ 
}

 PROCEDURE UpActionProc (ctl: ControlHandle; part: INTEGER);
 VAR
 newCtlValue: INTEGER;         { # of lines }
 dv, dh, difference: INTEGER;  { # of pixels }

 BEGIN
 IF part = 0 THEN { Mouse moved OUTSIDE the Control !! }
 EXIT(UpActionProc);
 oldCtlValue := ctl^^.contrlValue;
 dv := 12;  {Vertical, NOT sideways !!}
 dh := 0;

 difference := (oldCtlValue - ctl^^.contrlMin) * 12;
 IF difference = 0 THEN    { Prevent flickering. }
 EXIT(UpActionProc);
 IF difference < dv THEN
 dv := difference;

 { Decrement one line’s worth. }
    newCtlValue := oldCtlValue - 1;
   temp := ctl^^.contrlRect;
 { Just because SetCtlValue is buggy for a Mac II set to  }
  { black-and-white.  Set to color, it works okay, though? }
 InsetRect(temp, 1, 1);  
 ClipRect(temp);
 SetCtlValue(ctl, newCtlValue);
 ClipRect(window^.portRect); { Reset. }

 IF VertOrHoriz = horizScrollID THEN
 BEGIN
 dh := dv; {Sideways, NOT vertical !}
 dv := 0;
 END;   { IF }

 ScrollContents(ctl, dh, dv);

 Delay(8, finalTicks);    { ... otherwise too fast. }

 END;   { UpActionProc }

{ ------------------------------------------------------------------ 
}
{ Mouse clicked on the line arrows: }
{ ------------------------------------------------------------------ 
}
 PROCEDURE DownActionProc (ctl: ControlHandle; part: INTEGER);
 VAR
 newCtlValue: INTEGER;
 dv, dh, difference: INTEGER;

 BEGIN
 IF part = 0 THEN { Mouse moved OUTSIDE the Control !! }
 EXIT(DownActionProc);

 oldCtlValue := ctl^^.contrlValue;
 dv := 12;   {Vertical, NOT sideways !}
 dh := 0;

 difference := (ctl^^.contrlMax - oldCtlValue) * 12;
 IF difference = 0 THEN   { Prevent flickering. }
 EXIT(DownActionProc);
 IF difference < dv THEN
 dv := difference;

 { Bump it one line’s worth. }
        newCtlValue := oldCtlValue + 1;
 temp := ctl^^.contrlRect;
 InsetRect(temp, 1, 1);
 ClipRect(temp);
 SetCtlValue(ctl, newCtlValue);
 ClipRect(window^.portRect); { Reset. }

 IF VertOrHoriz = horizScrollID THEN
 BEGIN
 dh := dv; {Sideways, NOT vertical !}
 dv := 0;
 END;   { IF }

 ScrollContents(ctl, -dh, -dv);

 Delay(8, finalTicks);

 END;   { DownActionProc }
{ ------------------------------------------------------ }
{ Our main Scrolling routine: }
{ ------------------------------------------------------ }

 PROCEDURE Scroll (ctl: ControlHandle; part: INTEGER; Pt: Point);

{ ------------------------------------------------------------------ 
}
{ Scroll contents of window to      }
{ match pre-set Scroll Bar setting: }
{ ------------------------------------------------------------------ 
}
 PROCEDURE ScrollToThumbPosition (ctl: ControlHandle);
 VAR
 newCtlValue, dh, dv: INTEGER;
 BEGIN
 dh := 0;
 dv := 0;
 newCtlValue := ctl^^.contrlValue;

 IF VertOrHoriz = horizScrollID THEN
 dh := -(newCtlValue - oldCtlValue) * 12   { Normally, * teLineHite }
 ELSE   { = vertScrollID }
 dv := -(newCtlValue - oldCtlValue) * 12;

 ScrollContents(ctl, dh, dv);

 Delay(8, finalTicks);
 END;   { ScrollToThumbPosition }

{ ---------------------------------------------------------------------------------------------- 
}
{ Thumb goes UP; text, PICTure etc. scrolls DOWN: }
{ ---------------------------------------------------------------------------------------------- 
}
 PROCEDURE DoPageUp (ctl: ControlHandle);
 VAR
 partControl, newCtlValue, dv, ctlDelta: INTEGER;
 newPoint: Point;
 BEGIN
 WITH window^.portRect DO
 BEGIN
 IF VertOrHoriz = horizScrollID THEN
 dv := right - left - growBoxSize;
 { = (right+1-left) - scrollWidth }
 IF VertOrHoriz = vertScrollID THEN
 dv := bottom - top - growBoxSize;
 { = (bottom+1-top) - scrollHeight }
 END;   { WITH window^.portRect }

 ctlDelta := dv;
{ Normally divide by teLineHite, a field of TERecord whose   }
{ Handle is usually stored in wRefCon field of WindowRecord: }       
                                   ctlDelta := (ctlDelta DIV 12) - 1; 
 { Leave 1 line  }

 WHILE StillDown DO
 BEGIN

 GetMouse(newPoint);
 partControl := TestControl(ctl, newPoint);
 IF partControl = inPageUp THEN 
        { Still INSIDE Control ... }
 BEGIN
 oldCtlValue := ctl^^.contrlValue;
 newCtlValue := oldCtlValue - ctlDelta;
 temp := ctl^^.contrlRect;
 InsetRect(temp, 1, 1);
 ClipRect(temp);
 { Compensates if newCtlValue overshoots ctlMin. }
 SetCtlValue(ctl, newCtlValue);
 ClipRect(window^.portRect); 
 ScrollToThumbPosition(ctl);
 END;  { IF partControl = inPageUp }

 END;   { WHILE StillDown }

 END;   { DoPageUp }
{ ---------------------------------------------------------------------------------------------- 
}
{ Thumb goes DOWN; text, PICTure etc. scrolls UP: }
{ ---------------------------------------------------------------------------------------------- 
}
 PROCEDURE DoPageDown (ctl: ControlHandle);
 VAR
 partControl, newCtlValue, dv, ctlDelta: INTEGER;
 newPoint: Point;

 BEGIN
 WITH window^.portRect DO
 BEGIN
 IF VertOrHoriz = horizScrollID THEN
 dv := right - left - growBoxSize
 ELSE   { = vertScrollID }
 dv := bottom - top - growBoxSize;
 END;   { WITH window^.portRect }

 ctlDelta := (dv DIV 12) - 1;

 WHILE StillDown DO
 BEGIN
 GetMouse(newPoint);
 partControl := TestControl(ctl, newPoint);
 IF partControl = inPageDown THEN 
 { Still INSIDE Control ... }
 BEGIN
 oldCtlValue := ctl^^.contrlValue;
 newCtlValue := oldCtlValue + ctlDelta;
 temp := ctl^^.contrlRect;
 InsetRect(temp, 1, 1);
 ClipRect(temp);
 { Compensates if newCtlValue overshoots ctlMax. }
 SetCtlValue(ctl, newCtlValue);
 ClipRect(window^.portRect); 
 ScrollToThumbPosition(ctl);
 END;   { IF partControl = inPageDown }
 END;   { WHILE StillDown }

 END;   { DoPageDown }

 BEGIN   { Scroll }

 window := ctl^^.contrlOwner;
 SetPort(window);
 VertOrHoriz := ctl^^.contrlRFcon; {Up/Down or sideways??}
 oldCtlValue := GetCtlValue(ctl);

 CASE part OF

 inUpButton: 
 stillThere := TrackControl(ctl, Pt, @UpActionProc);
 inDownButton: 
 stillThere := TrackControl(ctl, Pt, @DownActionProc);
 inPageUp: 
 DoPageUp(ctl);
 inPageDown: 
 DoPageDown(ctl);
 inThumb: 
 BEGIN
 temp := ctl^^.contrlRect;
 InsetRect(temp, 1, 1);
 ClipRect(temp);
 IF TrackControl(ctl, Pt, NIL) <> 0 THEN
 ScrollToThumbPosition(ctl);
 ClipRect(window^.portRect);   { Reset. }
 END;   { InThumb }

 OTHERWISE
 BEGIN
 END;   { OTHERWISE }

 END;   { CASE }

 END;   { Scroll }
 ------------------------------------------------------ }
{ Does she or doesn’t she ?? }
{ ---------------------------------------------------- }
 FUNCTION DrawMyControl (ctl: ControlHandle): BOOLEAN;
 BEGIN
 IF (ctl <> NIL) & (ctl^^.contrlMax > ctl^^.contrlMin) THEN
 DrawMyControl := TRUE
 ELSE
 DrawMyControl := FALSE;
 END;   { DrawMyControl }

{ ---------------------------------------------------------------- }
{ Retrieve Control Handle, if any: }
{ ---------------------------------------------------------------- }
 FUNCTION ScrollHoriz (windPtr: WindowPtr): ControlHandle;
 VAR
 ourControl: ControlHandle;
 BEGIN
 ourControl := WindowPeek(windPtr)^.controlList;

 WHILE ourControl <> NIL DO
 BEGIN
 IF ourControl^^.contrlRFcon = horizScrollID THEN
 LEAVE;
 ourControl := ourControl^^.nextControl;
 END;   { WHILE ourControl <> NIL }

 ScrollHoriz := ourControl;
 END;   { ScrollHoriz }

 FUNCTION ScrollVert (windPtr: WindowPtr): ControlHandle;
 VAR
 ourControl: ControlHandle;
 BEGIN
 ourControl := WindowPeek(windPtr)^.controlList;

 WHILE ourControl <> NIL DO
 BEGIN
 IF ourControl^^.contrlRFcon = vertScrollID THEN
 LEAVE;
 ourControl := ourControl^^.nextControl;
 END;   { WHILE }

 ScrollVert := ourControl;
 END;   { ScrollVert }

{ ------------------------------------ }
{ Hello, or GoodBye: }
{ ------------------------------------ }
 PROCEDURE ScrollShow (windPtr: WindowPtr);
 VAR
 ctlHndl: ControlHandle;
 BEGIN
 ctlHndl := ScrollVert(windPtr);
 
 IF DrawMyControl(ctlHndl) THEN {Tests for NIL ctlHndl.}
 ShowControl(ctlHndl);
    { ---------- }
 ctlHndl := ScrollHoriz(windPtr);
 ;
 IF DrawMyControl(ctlHndl) THEN
 ShowControl(ctlHndl);
 END;   { ScrollShow }

 PROCEDURE ScrollHide (windPtr: WindowPtr);
 VAR
 ctlHndl: ControlHandle;
 BEGIN
 ctlHndl := ScrollVert(windPtr);
 
 IF DrawMyControl(ctlHndl) THEN
 HideControl(ctlHndl);
  { ---------- }
 ctlHndl := ScrollHoriz(windPtr);
 ;
 IF DrawMyControl(ctlHndl) THEN
 HideControl(ctlHndl);
 END;   { ScrollHide }

{ ---------------------------------------------------------------------------------------------------- 
}
{ Explicitly include the Scroll Bars in the window’s }
{ Update region.  This Update region will purposely  } 
{ overlap  the Grow Box.                             }
{ ---------------------------------------------------------------------------------------------------- 
}

 PROCEDURE InvalidScroll (windPtr: WindowPtr);

 VAR
 updateRect: rect;

 BEGIN
 IF DrawMyControl(ScrollVert(windPtr)) THEN
 BEGIN
 updateRect := windPtr^.portRect;
 InsetRect(updateRect, -1, -1); { Include window frame. }
 updateRect.left := updateRect.right - scrollWidth;
 InvalRect(updateRect);
 END;   { IF }
 
 IF DrawMyControl(ScrollHoriz(windPtr)) THEN
 BEGIN
 updateRect := windPtr^.portRect;
 InsetRect(updateRect, -1, -1);
 updateRect.top := updateRect.bottom - scrollHeight;
 InvalRect(updateRect);
 END;   { IF }
 END;   { InvalidScroll }

 PROCEDURE ValidScroll (windPtr: WindowPtr);
 VAR
 updateRect: rect;

 BEGIN
 IF DrawMyControl(ScrollVert(windPtr)) THEN
 BEGIN
 updateRect := windPtr^.portRect;
 InsetRect(updateRect, -1, -1);
 updateRect.left := updateRect.right - scrollWidth;
 ValidRect(updateRect);
 END;   { IF }
 
 IF DrawMyControl(ScrollHoriz(windPtr)) THEN
 BEGIN
 updateRect := windPtr^.portRect;
 InsetRect(updateRect, -1, -1);
 updateRect.top := updateRect.bottom - 
scrollHeight;
 ValidRect(updateRect);
 END;   { IF }
 END;   { ValidScroll }

 PROCEDURE ScrollResize (windPtr: WindowPtr);

 VAR
 contentRect: Rect;
 ctlHndl: ControlHandle;
 ctlWidth, ctlHeight, ctlTop, ctlLeft: INTEGER;

 BEGIN
 contentRect := windPtr^.portRect;

 { Remember, the portRect does NOT include the window frame, }
 { whereas the Scroll Bar and Grow Box sizes do:             }

 InsetRect(contentRect, -1, -1);
 ClipRect(contentRect);    { Sigh !! }
 
 ScrollHide(windPtr);   { Hide-and-Go Seek !! }

 ctlHndl := ScrollVert(windPtr);
 IF ctlHndl <> NIL THEN
 BEGIN

 WITH contentRect DO
 BEGIN
 ctlHeight := bottom - top - growBoxSize;
 ctlTop := top;
 ctlLeft := right - scrollWidth;
 END;   { WITH contentRect }

 SizeControl(ctlHndl, scrollWidth, ctlHeight);
 MoveControl(ctlHndl, ctlLeft, ctlTop);
 END;   { IF ctlHndl <> NIL }

  { ---------- }

 ctlHndl := ScrollHoriz(windPtr);
 IF ctlHndl <> NIL THEN
 BEGIN

 WITH contentRect DO
 BEGIN
 ctlWidth := right - left - growBoxSize;
 ctlTop := bottom - scrollHeight;
 ctlLeft := left;
 END;   { WITH contentRect }

 SizeControl(ctlHndl, ctlWidth, scrollHeight);
 MoveControl(ctlHndl, ctlLeft, ctlTop);
 END;   { IF ctlHndl <> NIL }

 ScrollShow(windPtr);{ Peek-a-Boo !! }
 ValidScroll(windPtr);

 ClipRect(windPtr^.portRect);  { Reset. }

 END;   { ScrollResize }

{ -------------------------------------------------------------------------------------------------------------- 
}
{ Set ONLY the maximum value(s) because the attached CNTL }
{ resources(s) specify the minimum -- generally zero.      }
{ -------------------------------------------------------------------------------------------------------------- 
}
 PROCEDURE SetMaxCtls (windPtr: WindowPtr);
 VAR
 oldClip: RgnHandle;
 ctlHndl: ControlHandle;
 dest, view: INTEGER;

 PROCEDURE SetMaxCtlValue (ctl: ControlHandle; excess: INTEGER);
 VAR
 maxValue: INTEGER;
 temp: Rect;

 BEGIN
 IF excess <= 0 THEN
 maxValue := ctl^^.contrlMin 
 { Inactivates Control since max = min. }
 ELSE  { PICTure taller than window }
 maxValue := (excess + 11) DIV 12; 
 { ... by this much [rounded up]. }

 IF maxValue <> ctl^^.contrlMax THEN
 BEGIN
 temp := ctl^^.contrlRect;
 InsetRect(temp, 1, 1);
 ClipRect(temp);
 SetCtlMax(ctl, maxValue);
 END;
 END;   { SetMaxCtlValue }

 BEGIN   { SetMaxCtls }

 oldClip := NewRgn;
 GetClip(oldClip);

 ctlHndl := ScrollVert(windPtr);
 IF ctlHndl <> NIL THEN
 BEGIN
 WITH windPICTrect DO    {  from my GetPicRects Proc. }
 view := bottom - top;
 WITH fullPICTrect DO    { Ditto. }
 dest := bottom - top;

 SetMaxCtlValue(ctlHndl, dest - view);
 END;   { IF ctlHndl <> NIL }

  { ---------- }

 ctlHndl := ScrollHoriz(windPtr);
 IF ctlHndl <> NIL THEN
 BEGIN
 WITH windPICTrect DO
 view := right - left;

 WITH fullPICTrect DO
 dest := right - left;

 SetMaxCtlValue(ctlHndl, dest - view);
 END;   { IF ctlHndl <> NIL }

 SetClip(oldClip);
 DisposeRgn(oldClip);

 END;   { SetMaxCtls }

{ -------------------------------------------------------------------- 
}
{ Called by the “HandleMouse” PROC:  }
{ -------------------------------------------------------------------- 
}

 PROCEDURE SetCtlsToMin (windPtr: WindowPtr);
 VAR
 oldClip: RgnHandle;

 PROCEDURE SetCtlValueToMin (ctl: ControlHandle);
 VAR
 temp: Rect;

 BEGIN
 IF ctl = NIL THEN
 EXIT(SetCtlValueToMin);

 temp := ctl^^.contrlRect;
 InsetRect(temp, 1, 1); {See comments in “UpActionProc”.}
 ClipRect(temp);
 SetCtlValue(ctl, GetCtlMin(ctl));
 END;   { SetCtlValueToMin }

 BEGIN   { SetCtlsToMin }

 oldClip := NewRgn;
 GetClip(oldClip);
 ;
 SetCtlValueToMin(ScrollHoriz(windPtr));
 SetCtlValueToMin(ScrollVert(windPtr));
 ;
 SetClip(oldClip);
 DisposeRgn(oldClip);

 END;   { SetCtlsToMin }

END.   { UNIT = rotScrollSubs }

Listing:  rotWindowSubs.p

UNIT rotWindowSubs;

INTERFACE

 USES
 Palettes, rotInterface, rotGlobals, rotMiscSubs, rotScrollSubs;

 FUNCTION GetWindowPartColor (window: WindowPtr; part: INTEGER; VAR color: 
RGBColor): BOOLEAN;
 PROCEDURE SetWindowPalette (wPtr: WindowPtr; plttID: INTEGER);
 PROCEDURE CalcWindowFrame (window: WindowPtr; VAR r: Rect);
 PROCEDURE DisplayWindow (window: WindowPtr);
 PROCEDURE CloseOurWindow (wPtr: WindowPtr);
 PROCEDURE DoCloseAll;
 PROCEDURE ZoomRect (sourceR, destR: Rect);

IMPLEMENTATION

{ ---------------------------------------- }
{ Finder’s keepers ... }
{ ---------------------------------------- }

 FUNCTION GetWindowPartColor (window: WindowPtr; part: INTEGER; VAR color: 
RGBColor): BOOLEAN;

 VAR
 auxWindowHdl: AuxWinHndl;
 windowCTab: CTabHandle;

 BEGIN
   { Assume NADA !! }
 GetWindowPartColor := FALSE;

 IF GetAuxWin(window, auxWindowHdl) THEN
 BEGIN
 windowCTab := auxWindowHdl^^.awCTable;
 IF (part < 0) | (part > windowCTab^^.ctSize) THEN
 { Color me paranoid !! }
 EXIT(GetWindowPartColor);
 color := windowCTab^^.ctTable[part].rgb;
 GetWindowPartColor := TRUE;
 END;   { IF window has a AuxWinRec }

 END;   { GetWindowPartColor }

{ ---------------------------------------------- }
{ ... in living Color !!  }
{ ---------------------------------------------- }

 PROCEDURE SetWindowPalette (wPtr: WindowPtr; plttID: INTEGER);

 VAR
 pal: PaletteHandle;

 BEGIN
 IF NOT aMac2 THEN
 EXIT(SetWindowPalette);

 pal := GetNewPalette(plttID);
 IF Handle(pal) <> NIL THEN
 BEGIN
 SetPalette(wPtr, pal, TRUE);
 ActivatePalette(wPtr);
 END;   { IF Handle(pal) <> NIL }

 END;   { SetWindowPalette }
{ ------------------------------------------------------------------------ 
}
{ CanNOT use the “structRgn” field of  }
{ window since this region hdl will be }
{ NIL if the window is NOT visible.    }
{ ------------------------------------------------------------------------ 
}

 PROCEDURE CalcWindowFrame (window: WindowPtr; VAR r: Rect);
 CONST
 frame = 1;
 shadow = 1;
 title = 18;
 VAR
 windDef: INTEGER;

 BEGIN
 windDef := GetWVariant(window);

 r := window^.portRect;
 InsetRect(r, -frame, -frame);
 IF (windDef = 0) OR (windDef > 3) THEN
 r.top := r.top - title;   { Window has a title bar. }
 IF (windDef = documentProc) OR (windDef = altDBoxProc) OR (windDef = 
noGrowDocProc) OR (windDef = zoomDocProc) THEN
 BEGIN
 r.bottom := r.bottom + shadow;
 r.right := r.right + shadow;
 END;   { Window has a shadow frame. }

 END;   { CalcWindowFrame }

{ ---------------------------------------------------- }
{ Before showing the window, }
{ center it on the screen.   }
{ ---------------------------------------------------- }

 PROCEDURE DisplayWindow (window: WindowPtr);
 CONST
 frame = 1;
     { shadow = 1;  - considered within CalcWindowFrame PROC }
 title = 18;
 VAR
 wFrameRect: rect;
 temp: INTEGER;
 Pt: Point;

 BEGIN
 CalcWindowFrame(window, wFrameRect);
 ;
 windDef := GetWVariant(window);  { In DoActivate, also. }

 WITH screen DO
 temp := bottom - top;
 WITH wFrameRect DO
 temp := temp - (bottom - top); { screen ht - window ht }
{ temp := temp + mBarHt;   --  NO!! because }
{ screen based on GrayRgn, NOT screenBits. }
 temp := temp DIV 2;
 temp := temp + frame;
 IF (windDef = 0) OR (windDef > 3) THEN
 temp := temp + title;  { Window has a title bar. }
 Pt.v := screen.top + temp;
 { ---------- }
 WITH screen DO
 temp := right - left;
 WITH wFrameRect DO
 temp := temp - (right - left); { screen - window width }
 Pt.h := screen.left + temp DIV 2;

 MoveWindow(window, Pt.h, Pt.v, TRUE);
 ShowWindow(window);
 ScrollResize(window);

 END;   { DisplayWindow }

{ ---------------------------------------------- }
{ One at a time, folks !! }
{ ---------------------------------------------- }
 PROCEDURE CloseOurWindow (wPtr: WindowPtr);

 VAR
 myPic: PicHandle;
 pal: PaletteHandle;
 aux: BOOLEAN;
 auxWind: AuxWinHndl;

 BEGIN
 IF aMac2 THEN
 BEGIN
 pal := GetPalette(wPtr);
 IF pal <> NIL THEN
 DisposePalette(pal);
 aux := GetAuxWin(wPtr, auxWind);
 IF aux THEN
 ReleaseResource(Handle(auxWind));
 END;    { IF aMac2 }

 myPic := GetWindowPic(wPtr);
 IF myPic <> NIL THEN
 BEGIN
 HUnlock(Handle(myPic));
 ReleaseResource(Handle(myPic));
 END;   { IF myPic <> NIL }

 horizControl := ScrollHoriz(wPtr);
 IF horizControl <> NIL THEN
    { Calls ReleaseResource(Handle(AuxCtlHndl)); }
 DisposeControl(horizControl);
  { -------- }
 vertControl := ScrollVert(wPtr);
 IF vertControl <> NIL THEN
 DisposeControl(vertControl);
  { -------- }
 DisposeWindow(wPtr);

 END;   { CloseOurWindow }

{ -------------------------------------------------------------------------------------------------------- 
}
{ DoCloseAll is called from the “Quit” command on the  }
{ main Menu, and when we close our main window.        }
{ -------------------------------------------------------------------------------------------------------- 
}
 PROCEDURE DoCloseAll;
 VAR
 window: WindowPeek;

 BEGIN
 window := WindowPeek(FrontWindow);

 WHILE window <> NIL DO
 BEGIN
 IF window^.windowKind < 0 THEN
 CloseDeskAcc(window^.windowKind)
 ELSE
 CloseOurWindow(WindowPtr(window));

 window := window^.nextWindow;
 END;   { WHILE window <> NIL }

 END;   { DoCloseAll }

 PROCEDURE ZoomRect (sourceR, destR: Rect);  {Global coords}
 CONST
 DragPatternLoc = $A34;
 pixPatID = 128;
 VAR
 oldPort: GrafPtr;
 oldWindow: WindowPtr;
 bigGrafPort: GrafPort;
 bigGrafPtr: GrafPtr;
 bigCGrafPort: CGrafPort;
 bigCGrafPtr: CGrafPtr;
 union, srcRect, dstRect, box: Rect;
 increment, delTop, delLeft, delBottom, delRight, i: INTEGER;
 aux: BOOLEAN;
 frameColor: RGBColor;
 bwDragPattern: Pattern;
 cDragPattern: PixPatHandle;

 BEGIN
 IF EqualRect(sourceR, destR) THEN
 EXIT(ZoomRect);
 
 UnionRect(sourceR, destR, union);
 IF (NOT EqualRect(union, sourceR)) & (NOT EqualRect(union, destR)) THEN
 EXIT(ZoomRect); { One does NOT enclose the other !! }

 GetPort(oldPort);

 oldWindow := FrontWindow;
 IF (oldWindow <> NIL) & (colorDepth > 1) THEN
 aux := GetWindowPartColor(oldWindow, wFrameColor, frameColor);

 IF colorDepth = 1 THEN
 BEGIN
 bigGrafPtr := @bigGrafPort;
 OpenPort(bigGrafPtr);
 SetPort(bigGrafPtr);
 END   { IF colorDepth = 1 }
 ELSE
 BEGIN
 bigCGrafPtr := @bigCGrafPort;
 OpenCPort(bigCGrafPtr);
 SetPort(GrafPtr(bigCGrafPtr));
 END;

 srcRect := sourceR;
 dstRect := destR;
 GlobalLocal(srcRect);
 GlobalLocal(dstRect);

 increment := 5;
 delTop := (dstRect.top - srcRect.top) DIV increment;
 delLeft := (dstRect.left - srcRect.left) DIV increment;
 delBottom := (dstRect.bottom - srcRect.bottom) DIV increment;
 delRight := (dstRect.right - srcRect.right) DIV increment;

 bwDragPattern := PatPtr(DragPatternLoc)^;
 PenPat(bwDragPattern); { My default state ... }
 PenMode(patXor);

 IF colorDepth > 1 THEN   { in color }
 BEGIN
 cDragPattern := GetPixPat(pixPatID);

 IF cDragPattern <> NIL THEN
 BEGIN
 IF (oldWindow <> NIL) & aux THEN
 MakeRGBPat(cDragPattern, frameColor);
 PenPixPat(cDragPattern);
 END;   { IF cDragPattern <> NIL }

 END;   { in color }

  { Start AWAY from source AND stop short of destination. }
 box := srcRect;

 FOR i := 1 TO (increment - 1) DO
 BEGIN
 WITH box DO
 SetRect(box, left + delLeft, top + delTop, right + delRight, bottom 
+ delBottom);

 FrameRect(box);
 ;
 Delay(15, finalTicks);   { Hang on, Mac !! }
 END;   { FOR }

 PenNormal;

 IF colorDepth > 1 THEN
 BEGIN
 CloseCPort(bigCGrafPtr);
  { Done by _CloseCPort:         }
  { IF cDragPattern <> NIL THEN  }
    {  DisposPixPat(cDragPattern); }
                          
 END
 ELSE   { B&W }
 ClosePort(bigGrafPtr);
 
 SetPort(oldPort);
 END;   { ZoomRect }

END.   { UNIT = rotWindowSubs }


Listing:  Rotate.p

PROGRAM Rotate;
{$I-}
 USES
 Palettes, rotInterface, rotGlobals, rotMiscSubs, OffscreenSubs, rotScrollSubs, 
rotWindowSubs;
 LABEL
 100;

{ ---------------------------------------------- }
{ Guess what this does ?? }
{ ---------------------------------------------- }
 PROCEDURE HandleCursor;
 
 VAR
 mouse: Point;
 CURS_Hdl: CursHandle;

 BEGIN
 IF daWind OR NOT InForeGround THEN
 EXIT(HandleCursor);
 { DAs & other applications roll their own }

 GetMouse(mouse);
 IF PtInRect(mouse, FrontWindow^.portRect) THEN
 BEGIN
 InWindow := TRUE;
 ;
 IF aMac2 THEN
 BEGIN
 IF colorHandCrsr <> NIL THEN  {Activate Event 1st! }
 IF NOT stillColorCrsr THEN  { ROM problem. }
 BEGIN
 SetCCursor(colorHandCrsr);
 stillColorCrsr := TRUE;
 END;   { IF...IF }
 END   { IF aMac2 }
 ELSE  { NOT aMac2 }
 InitCursor;

 END   { IF PtInRect(...) }

 ELSE   { NOT PtInRect() }

 BEGIN
 InWindow := FALSE;
 InitCursor;
 stillColorCrsr:= FALSE
 END;   { ELSE }

END;   { HandleCursor }

{ ------------------------------------------ }
{ To be or not to be !! }
{ ------------------------------------------ }
 PROCEDURE SetEnable (menu: MenuHandle; item: INTEGER; enabled: BOOLEAN);
 BEGIN
 IF enabled THEN
 EnableItem(menu, item)
 ELSE
 DisableItem(menu, item);
 END;   { SetEnable }

{ -------------------------------------------------------------------------------------------------------------- 
}
{ PeriodicMenus is called before action is taken on menu  }
{ commands to correctly enable or disable the “Edit” Menu }
{ in case a Desk Accessory owns the front window or no    }
{ window is up,  respectively.  The latter affects        } 
{ individual items in other Menu(s).                      }
{---------------------------------------------------------------------------------------------------------------- 
}
 PROCEDURE PeriodicMenus;
 VAR
 FW: WindowPeek;

 BEGIN
 FW := WindowPeek(FrontWindow);
 daWind := (FW <> NIL) & (FW^.windowKind < 0);
 { Used by HandleCursor. }
 applWind := (FW <> NIL) & (NOT daWind);

 IF applWind <> currGraphics THEN
 { No need to repeat yourself !! }
 BEGIN
 SetEnable(GraphicsMenu, RotateItem, applWind);
 SetEnable(GraphicsMenu, DissolveItem, applWind);
 currGraphics := applWind;   { Reset. }
 END;

 IF daWind = currEdit THEN 
 { Avoid a flickering Menu Bar. }
 EXIT(PeriodicMenus);
 currEdit := daWind;   { Reset. }

 IF daWind THEN  { the WHOLE thing !! }
 EnableItem(EditMenu, 0)
 ELSE
 DisableItem(EditMenu, 0);
 DrawMenuBar;
 END;   { PeriodicMenus }

{ -------------------- }
{ Bye-Bye !! }
{ -------------------- }

 PROCEDURE DoQuit;
 BEGIN
 HUnlock(Handle(monsterPicHdl));
 ReleaseResource(Handle(monsterPicHdl));
 IF aMac2 & (colorHandCrsr <> NIL) THEN
 DisposCCursor(colorHandCrsr);
 DoCloseAll;
 
 Done := TRUE;
 END;   { DoQuit }

{ ---------------- }
{ Enjoy !! }
{ ---------------- }

 PROCEDURE SpiffyRoll;
 LABEL
 100, 200, 300;
 VAR
 bragging: WindowPtr;
 logoPicHdl: PicHandle;
 bragRect: Rect;
 tempX, tempY: INTEGER;
 rollRect: Rect;
 maskPercent: INTEGER;

 BEGIN
 { I get here ONLY when I have a window. }
 bragging := FrontWindow;
 IF bragging = NIL THEN    { ... but just in case !! }
 GOTO 300;
 
 logoPicHdl := PicHandle(GetWRefCon(bragging));
 IF logoPicHdl = NIL THEN
 GOTO 200;

 bragRect := bragging^.portRect;

 WITH bragRect DO
 BEGIN
 IF (ScrollVert(bragging) <> NIL) | (ScrollHoriz(bragging) <> NIL) THEN
 BEGIN
 right := (right + 1) - scrollWidth;
 bottom := (bottom + 1) - scrollHeight;
 END;   { IF there are Scroll Bar(s) }
 
 tempX := right - left;
 tempY := bottom - top;
 END;   { WITH bragRect }

{ Because I know my WINDow & PICT sizes, }   
{ tempX & tempY are always > 0:          }

 WITH logoPicHdl^^.picFrame DO
 BEGIN
 tempX := tempX - (right - left);
 tempY := tempY - (bottom - top);
 END;   { WITH logoPicHdl^^.picFrame }

 WITH bragRect DO
 BEGIN
 top := top + tempY DIV 2;
 bottom := top + (logoPicHdl^^.picFrame.bottom - logoPicHdl^^.picFrame.top);
 left := left + tempX DIV 2;
 right := left + (logoPicHdl^^.picFrame.right - logoPicHdl^^.picFrame.left);
 END;   { WITH bragRect }

  { ------------------------------------------------ }
  { Place my PICTure into an }
  { off screen BitMap.       }
  { ------------------------------------------------ }

{ Local window coordinates are input;   }
{ local screen coordinates are returned.}

 CreateOffScreenError := CreateOffScreen(bragRect);
 IF CreateOffScreenError <> noErr THEN
 GOTO 100;

 ClipRect(bragRect);     { Draw off-screen. }                  
 EraseRect(bragRect);    { Eliminate all stray matter. }
 DrawPicture(logoPicHdl, bragRect);

 ToOnScreen;    { Back to “Square 1”. }

 BackColor(whiteColor);
 ForeColor(blackColor);
  { ---------- }
 ClipRect(bragRect);
 rollRect := bragRect;
 maskPercent := 1;

 WHILE maskPercent <= 100 DO
 BEGIN
 WITH bragRect DO
 rollRect.bottom := top + ((bottom - top) * maskPercent) DIV 100;
 CopyBits(offBitMapPtr^, onScreenBitsPtr^, rollRect, rollRect, srcCopy, 
NIL);
 
 IF colorDepth = 1 THEN
 Delay(10, finalTicks)   { Black-and-white too doggone fast !! }
 ELSE
 Delay(7, finalTicks);   { Color a tad better. }
 
 maskPercent := maskPercent + 1;
 END;   { WHILE maskPercent <= 100 }
  { ---------- }
 Delay(240, finalTicks); {Take a gander at its beauty !!}

100:
 DisposOffScreen;
 HUnlock(Handle(logoPicHdl));
 ReleaseResource(Handle(logoPicHdl));
200:
 CloseOurWindow(bragging); {Activates window behind it.}
300:
 RemoveVBLTask;
 SysBeep(10);               { Wake Up Call !! }
 END;   { SpiffyRoll }

{ -------------------------------------------------------- }
{ Now for Mike Morton’s spiffy }
{ dissolve stuff ...           }
{ -------------------------------------------------------- }
 PROCEDURE SpiffyDissolve;
 LABEL
 100, 200;
 VAR
 oldPort: GrafPtr;
 gigantorPicHdl: picHandle;
 gigantorRect: Rect;
 tempX, tempY: INTEGER;
 offBitMap, onScreenBits: BitMap;
 BEGIN
 GetPort(oldPort);
 IF colorDepth > 1 THEN
 gigantorPicHdl := GetPicture(colorGigantorID)
 { They’re SO ugly, they’re cute !! }
 ELSE
 gigantorPicHdl := GetPicture(bwGigantorID);
 
 IF gigantorPicHdl = NIL THEN
 GOTO 200;

 HLock(Handle(gigantorPicHdl));

 WITH gigantorPicHdl^^.picFrame DO
 { First, center the PICTure ... }
 BEGIN
 tempX := right - left;
 tempY := bottom - top;
 END;

 WITH oldPort^.portRect DO
 BEGIN
 tempX := right - left - tempX;
 tempX := left + tempX DIV 2;
 tempY := bottom - top - tempY;
 tempY := top + tempY DIV 2;
 END;
{ I KNOW that the portRect of the attached WINDow is larger }
{ than the PICT, so I did NOT need to test above for fit.   }
 WITH gigantorRect DO
 BEGIN
 top := tempY;
 left := tempX;
 bottom := top + gigantorPicHdl^^.picFrame.bottom - gigantorPicHdl^^.picFrame.top;
 right := left + gigantorPicHdl^^.picFrame.right - gigantorPicHdl^^.picFrame.left;
 END;

  { -------------------------------------------------------------------------------------- 
}
  { Place my PICTure into an off screen BitMap  }
  { -------------------------------------------------------------------------------------- 
}
 CreateOffScreenError := CreateOffScreen(gigantorRect);
 IF CreateOffScreenError <> noErr THEN
 GOTO 100;

 ClipRect(gigantorRect);   { Draw off-screen ... }
 EraseRect(gigantorRect);
 DrawPicture(gigantorPicHdl, gigantorRect);

 ToOnScreen;   { Then, back to “Square 1” ... }
 ClipRect(gigantorRect);

{ So funny colorization doesn’t happen. }

 BackColor(whiteColor);
 ForeColor(blackColor);
 
 DissBits(offBitMapPtr^, onScreenBitsPtr^, gigantorRect, gigantorRect);

  { -------------------------------------------------------------- }
  { Now, wasn’t that neat, folks !! }
  { -------------------------------------------------------------- }
100:
 DisposOffScreen;
 SetPort(oldPort);
 HUnlock(Handle(gigantorPicHdl));
 ReleaseResource(Handle(gigantorPicHdl));
200:
 Delay(60, finalTicks);
 END;   { SpiffyDissolve }

{ -------------------------------------------------------------------------- 
}
{ DoApple is the code for the “Apple”   }
{ Menu.  The other two Menus follow.    }
{ NOTE: CanNOT use “TheWindow” from the }
{ FindWindow call in the MainEventLoop  }
{ because TheWindow = NIL for a         }
{ windowLoc = inMenuBar:                }
{ -------------------------------------------------------------------------- 
}
 PROCEDURE DoApple (item: INTEGER);
 CONST
 MyString = ‘Programming by I•A•C•S Software and John A. Love, III of 
the Washington Apple Pi Users’ Group’;
 VAR
 oldPort: GrafPtr;
 window, bragging: WindowPtr;
 logoPicHdl: PicHandle;
 skipScroll: BOOLEAN;
 scrollStr: Str255;
 IACSBuffer: QDPtr;
 IACSBox: Rect;
 tempX, tempY: INTEGER;
 accName: Str255;
 accNumber: INTEGER;
 oldForeColor, oldBackColor, contentColor: RGBColor;

 BEGIN
 CASE item OF
 AboutItem: 
 BEGIN
 IF NOT applWind THEN      { NO window. }
 EXIT(DoApple);
 skipScroll := FALSE;      { Everything's cool !! }
 window := FrontWindow;

      { Determine the visible part of the window's }
      { content region, LESS any Scroll Bar(s):    }
 IACSBox := window^.portRect;    { For starters ... }
 ;
 WITH IACSBox DO
 BEGIN
 IF (ScrollVert(window) <> NIL) | (ScrollHoriz(window) <> NIL) THEN
 BEGIN
 right := (right + 1) - scrollWidth;
 bottom := (bottom + 1) - scrollHeight;
 END;   { IF }
 END;   { WITH IACSBox }
 ;
 LocalGlobal(IACSBox);
 WITH screenBits.bounds DO
 BEGIN
 IF IACSBox.top < top THEN
 IACSBox.top := top;
 IF IACSBox.left < left THEN
 IACSBox.left := left;
 IF IACSBox.bottom > bottom THEN
 IACSBox.bottom := bottom;
 IF IACSBox.right > right THEN
 IACSBox.right := right;
 END;   { WITH screenBits.bounds }
 GlobalLocal(IACSBox);
 ;
 WITH IACSBox DO
 BEGIN
 tempX := right - left;
 tempY := bottom - top;
 top := top + (tempY - 20) DIV 2;
 bottom := top + 20;
 left := left + 10;
 right := right - 10;
 END;
 ;
 IF (tempX < 40) OR (tempY < 20) THEN
 skipScroll := TRUE;  { NOT wide or tall enough !! }

 InstallVBLTask(acurWorld);

      { ========== }
 IF NOT skipScroll THEN
 BEGIN

 scrollStr := MyString;
 IACSBuffer := QDPtr(ORD4(@scrollStr));

 IF colorDepth > 1 THEN
 BEGIN
 GetBackColor(oldBackColor);
 PmBackColor(pmLtGray);
 GetForeColor(oldForeColor);
 PmForeColor(pmRed);
 END;   { IF colorDepth > 1 }
 ScrollText(IACSBuffer, IACSBox);    { ********** }

 IF colorDepth > 1 THEN
 BEGIN
 IF GetWindowPartColor(window, wContentColor, contentColor) THEN
 RGBBackColor(contentColor)
 ELSE
 RGBBackColor(oldBackColor);

 RGBForeColor(oldForeColor);
 END;   { IF colorDepth > 1 }
 ;
 EraseRect(IACSBox);  { In above background color. }
 InvalRect(IACSBox);  { --> an Update Event.       }

 END;   { IF NOT skipScroll }
      { ========== }

 bragging := GetNewWindow(logoWindowID, NIL, WindowPtr(-1));

      { ////////// }
 IF bragging <> NIL THEN
 BEGIN
 logoPicHdl := GetPicture(logoID);
 SetWRefCon(bragging, LONGINT(logoPicHdl));   { Save for retrieval in 
"SpiffyRoll". }

 IF logoPicHdl <> NIL THEN
 BEGIN
 HLock(Handle(logoPicHdl));
 ;
 SetPort(bragging);
 DisplayWindow(bragging);
 ;
 justBragging := TRUE;
 ValidRect(bragging^.portRect);      { ... so we don't draw in the darn 
thing !! }
 END;  { IF logoPicHdl <> NIL }

 END;  { IF bragging <> NIL }
      { ////////// }
 END;   { AboutItem }

 { NEVER seen -- shown for completeness, only. }
 AdisabledItem:
 BEGIN
 END;   { AdisabledItem }
 OTHERWISE
 BEGIN
 GetPort(oldPort);
 ;
 GetItem(AppleMenu, item, accName);
 accNumber := OpenDeskAcc(accName);
 ;
 SetPort(oldPort);
 END;   { OTHERWISE }
 END;   { CASE...OF }
 END;   { DoApple }

 PROCEDURE DoEdit (item: INTEGER);
 BEGIN
 IF SystemEdit(item - 1) THEN
 EXIT(DoEdit);   { DAs do their own thing !! }
 CASE item OF
 UndoItem, EdisabledItem, CutItem, CopyItem, PasteItem, ClearItem: 
 BEGIN
 END;
 END;   { CASE...OF }
 END;   { DoEdit }

{ -------------------------------------------------------------------------------------------- 
}
{ Jon Zap definitely scored a homer on this one: }
{ This is truly a journey into CopyBits ‘Hell’   }
{ -------------------------------------------------------------------------------------------- 
}
 PROCEDURE DoGraphics (item: INTEGER);
 LABEL
 100, 200;
 VAR
 oldPort: GrafPtr;
 kFullPICTrect, gWindPICTrect, kWindPICTrect: Rect;   {g:global & k:local}
 offBitMap, rotBitMap1, rotBitMap2,
 rotBitMap3, rotBitMap4: BitMap;
 rotBitMapPtr1, rotBitMapPtr2,
 rotBitMapPtr3, rotBitMapPtr4: BitMapPtr;
 onScreenRgn: Rgnhandle;
 copyRect: Rect;
 myRotHdl1, myRotHdl2, myRotHdl3, myRotHdl4: Handle;
 rotPixMap1, rotPixMap2,
 rotPixMap3, rotPixMap4: PixMapHandle;
 err: OSErr;
 toooooFast: BOOLEAN;

 PROCEDURE ErrorOut (iteration: INTEGER; rotBitMap: BitMap; error: OSErr);
 VAR
 rotHandle: Handle;
 BEGIN
 IF iteration > 1 THEN   
 { Disposes of stuff even if NO error. }
 BEGIN
 rotHandle := RecoverHandle(rotBitMap.baseAddr);
 HUnlock(rotHandle);
 DisposHandle(rotHandle);
 END;   { IF }

 IF error = memFullErr THEN
 GOTO 100;
 END;   { ErrorOut }

 BEGIN   { DoGraphics }
 CASE item OF
 RotateItem: 
 BEGIN
 IF NOT applWind THEN  { Whoops !! }
 EXIT(DoRotate);
 GetPort(oldPort);  { Where in the ?!*!? are we }

{ ------------------------------------------------------------------------ 
}
{ Place my PICTure into an off screen  }
{ BitMap so we can rotate this dude !! }
{                                      }
{ ... should be old-hat by now.        }
{ ------------------------------------------------------------------------ 
}
 SetPort(FrontWindow);
 InstallVBLTask(acurDogCow);
 { Round-and-around she goes ... }

{ We’re about to switch the Port off-screen:        }
{ NOTE: keep original rects intact by using copies. }
 kFullPICTrect := scrolledFullPICTrect;
 gWindPICTrect := windPICTrect;
 LocalGlobal(gWindPICTrect);
 
 CreateOffScreenError := CreateOffScreen(kFullPICTrect);
 IF CreateOffScreenError <> noErr THEN
 GOTO 200;
 
 offBitMap := offBitMapPtr^;

{ We canNOT call _GlobalToLocal here because we’ve changed   }
{ the portBits.bounds rect of our off-screen port within     }
{ “CreateOffScreen”. See “_GlobalToLocal” within Inside Mac. }   
 kWindPICTrect := gWindPICTrect;
 WITH screenBits.bounds DO { Bounds BEFORE change. }
 OffsetRect(kWindPICTrect, left, top);

 IF colorDepth > 1 THEN
 BEGIN
 rotPixMap1 := NewPixMap; { Everything but the Color Table.  It comes 
next ...}
 CopyPixMap(offCGrafPtr^.portPixMap, rotPixMap1);
 rotBitMapPtr1 := BitMapPtr(rotPixMap1^);
 ;
 rotPixMap2 := NewPixMap;
 CopyPixMap(offCGrafPtr^.portPixMap, rotPixMap2);
 rotBitMapPtr2 := BitMapPtr(rotPixMap2^);
 ;
 rotPixMap3 := NewPixMap;
 CopyPixMap(offCGrafPtr^.portPixMap, rotPixMap3);
 rotBitMapPtr3 := BitMapPtr(rotPixMap3^);
 ;
 rotPixMap4 := NewPixMap;
 CopyPixMap(offCGrafPtr^.portPixMap, rotPixMap4);
 rotBitMapPtr4 := BitMapPtr(rotPixMap4^);
 END   { IF colorDepth > 1 }

 ELSE

 BEGIN
 rotBitMapPtr1 := BitMapPtr(NewClearPtr(SIZEOF(BitMap)));
 rotBitMapPtr2 := BitMapPtr(NewClearPtr(SIZEOF(BitMap)));
 rotBitMapPtr3 := BitMapPtr(NewClearPtr(SIZEOF(BitMap)));
 rotBitMapPtr4 := BitMapPtr(NewClearPtr(SIZEOF(BitMap)));
 END;   { ELSE }

 rotBitMap1 := rotBitMapPtr1^;
 rotBitMap2 := rotBitMapPtr2^;
 rotBitMap3 := rotBitMapPtr3^;
 rotBitMap4 := rotBitMapPtr4^;

      { -------------------------------------- }
      { Draw off-screen ... }
      { -------------------------------------- }
 ClipRect(kFullPICTrect);
 { Eliminate all stray matter. }
 EraseRect(kFullPICTrect);
 DrawPicture(monsterPicHdl, kFullPICTrect);

      { -------------------------------------------- }
      { Back to “Square 1” ... }
      { -------------------------------------------- }
 ToOnScreen;
 ClipRect(kWindPICTrect);

      { ---------------------------------------------------- }
      { Now, for the fun stuff ... }
      { ---------------------------------------------------- }
 { So funny colorization doesn’t happen. }
 BackColor(whiteColor);
 ForeColor(blackColor);
    { Black-and-white TOOOOO fast !! } toooooFast := aMac2 & (colorDepth 
= 1);

 err := RotateBits(offBitMap, rotBitMap1);
 ErrorOut(1, offBitMap, err);
 IF colorDepth > 1 THEN
 BlockMove(Ptr(@rotBitMap1), Ptr(rotPixMap1^), SIZEOF(BitMap));
 EraseRect(kWindPICTrect);
 copyRect := rotBitMap1.bounds;
 IF colorDepth = 1 THEN
 CopyBits(rotBitMap1, onBWScreen^.portBits, copyRect, copyRect, srcCopy, 
NIL)
 ELSE
 CopyBits(BitMapPtr(rotPixMap1^)^, BitMapPtr(onCScreen^.portPixMap^)^, 
copyRect, copyRect, srcCopy, NIL);
 IF toooooFast THEN
 Delay(90, finalTicks);

      { +++++ }
 err := RotateBits(rotBitMap1, rotBitMap2);
 ErrorOut(2, rotBitMap1, err);
 IF colorDepth > 1 THEN
 BlockMove(Ptr(@rotBitMap2), Ptr(rotPixMap2^), SIZEOF(BitMap));
 EraseRect(kWindPICTrect);
 copyRect := rotBitMap2.bounds;
 IF colorDepth = 1 THEN
 CopyBits(rotBitMap2, onBWScreen^.portBits, copyRect, copyRect, srcCopy, 
NIL)
 ELSE
 CopyBits(BitMapPtr(rotPixMap2^)^, BitMapPtr(onCScreen^.portPixMap^)^, 
copyRect, copyRect, srcCopy, NIL);
 IF toooooFast THEN
 Delay(90, finalTicks);

      { +++++ }
 err := RotateBits(rotBitMap2, rotBitMap3);
 ErrorOut(3, rotBitMap2, err);
 IF colorDepth > 1 THEN
 BlockMove(Ptr(@rotBitMap3), Ptr(rotPixMap3^), SIZEOF(BitMap));
 EraseRect(kWindPICTrect);
 copyRect := rotBitMap3.bounds;
 IF colorDepth = 1 THEN
 CopyBits(rotBitMap3, onBWScreen^.portBits, copyRect, copyRect, srcCopy, 
NIL)
 ELSE
 CopyBits(BitMapPtr(rotPixMap3^)^, BitMapPtr(onCScreen^.portPixMap^)^, 
copyRect, copyRect, srcCopy, NIL);
 IF toooooFast THEN
 Delay(90, finalTicks);

      { +++++ }
 err := RotateBits(rotBitMap3, rotBitMap4);
 ErrorOut(4, rotBitMap3, err);
 IF colorDepth > 1 THEN
 BlockMove(Ptr(@rotBitMap4), Ptr(rotPixMap4^), SIZEOF(BitMap));
 EraseRect(kWindPICTrect);
 copyRect := rotBitMap4.bounds;

 IF colorDepth = 1 THEN
 CopyBits(rotBitMap4, onBWScreen^.portBits, copyRect, copyRect, srcCopy, 
NIL)
 ELSE
 CopyBits(BitMapPtr(rotPixMap4^)^, BitMapPtr(onCScreen^.portPixMap^)^, 
copyRect, copyRect, srcCopy, NIL);

 myRotHdl4 := RecoverHandle(rotBitMap4.baseAddr);
 { The last straggler ... }
 HUnlock(myRotHdl4);
 DisposHandle(myRotHdl4);

      { -------------------------------------------------------------- 
}
      { Now, wasn’t that neat, folks !! }
      { -------------------------------------------------------------- 
}
100:
 IF colorDepth > 1 THEN
 BEGIN
 DisposHandle(Handle(ourCTHandle));
 DisposPixMap(rotPixMap1);
 DisposPixMap(rotPixMap2);
 DisposPixMap(rotPixMap3);
 DisposPixMap(rotPixMap4);
 END   { IF colorDepth > 1 }
 ELSE
 BEGIN
 DisposPtr(Ptr(rotBitMapPtr1));
 DisposPtr(Ptr(rotBitMapPtr2));
 DisposPtr(Ptr(rotBitMapPtr3));
 DisposPtr(Ptr(rotBitMapPtr4));
 END;   { ELSE }
200:
 DisposOffScreen;
 SetPort(oldPort);
 RemoveVBLTask;
 END;   { RotateItem }
 DissolveItem: 
 BEGIN

 IF NOT applWind THEN  { Whoops !! }
 EXIT(DoGraphics);
 ;
 GetPort(oldPort);

      { ------------------- }
      { Here we go again !! }
      { ------------------- }
 kFullPICTrect := scrolledFullPICTrect;
 LocalGlobal(kFullPICTrect);
 ;
 kWindPICTrect := windPICTrect;
 CreateOffScreenError := CreateOffScreen(kWindPICTrect);
 IF CreateOffScreenError <> noErr THEN
 GOTO 300;
 ;
 WITH screenBits.bounds DO           
     { _GlobalToLocal }
 OffsetRect(kFullPICTrect, left, top);

 ClipRect(kWindPICTrect);
 EraseRect(kWindPICTrect); { ... a clean slate. }
 ;
 BackColor(whiteColor);
 ForeColor(blackColor);
 ;
 onScreenRgn := NewRgn;
 RectRgn(onScreenRgn, screenBits.bounds);

 CopyBits(oldPort^.portBits, offBitMapPtr^, windPICTrect, kWindPICTrect, 
srcCopy, onScreenRgn);
 DisposeRgn(onScreenRgn);

 ToOnScreen;

 ClipRect(kWindPICTrect);
 EraseRect(kWindPICTrect);

 WITH screenBits.bounds DO  { Bomb-aroo if dissolving OFF screen !! }
 BEGIN
 IF kWindPICTrect.top < top THEN
 kWindPICTrect.top := top;
 IF kWindPICTrect.left < left THEN
 kWindPICTrect.left := left;
 IF kWindPICTrect.bottom > bottom THEN
 kWindPICTrect.bottom := bottom;
 IF kWindPICTrect.right > right THEN
 kWindPICTrect.right := right;
 END;   { WITH }
 ;
 ignore := SectRect(kWindPICTrect, kFullPICTrect, kFullPICTrect);   { 
Just the pic. }

 DissBits(offBitMapPtr^, onScreenBitsPtr^, kFullPICTrect, kFullPICTrect);
300:
 DisposOffScreen;

 SetPort(oldPort);
 END;   { DissolveItem }

 GdisabledItem: 
 BEGIN
 END;   { RdisabledItem }
 QuitItem: 
 DoQuit;
 OTHERWISE
 BEGIN
 END;   { OTHERWISE }
 END;   { CASE...OF }
 END;   { DoGraphics }

{ -------------------------------------------------------------------------- 
}
{ HandleMenu is the top level dispatch  }
{ routine for menu commands.  The item  }
{ selected is passed to the appropriate }
{ menu handler.                         }
{ -------------------------------------------------------------------------- 
}
 PROCEDURE HandleMenu;
 VAR
 menuCode: LONGINT;
 charCode: INTEGER;
 BEGIN
 IF Event.what = MouseDown THEN
 menuCode := MenuSelect(Event.where)
 ELSE
 BEGIN
 charCode := BitAnd(Event.message, CharCodeMask);
 menuCode := MenuKey(CHR(charCode));
 END;   { ELSE }
 CASE HiWord(menuCode) OF
 AppleMenuID: 
 DoApple(LoWord(menuCode));
 EditMenuID: 
 DoEdit(LoWord(menuCode));
 GraphicsMenuID: 
 DoGraphics(LoWord(menuCode));
 OTHERWISE
 IF Event.what = KeyDown THEN
 SysBeep(10);
 END;   { CASE }

 HiLiteMenu(0)
 END;   { HandleMenu }

 PROCEDURE SetUpMenus;
 BEGIN
 AppleMenu := GetMenu(AppleMenuID);
 InsertMenu(AppleMenu, 0);
 AddResMenu(AppleMenu, ‘DRVR’);  { + DAs }
 ;
 EditMenu := GetMenu(EditMenuID);
 InsertMenu(EditMenu, 0);
 DisableItem(EditMenu, 0);  { The WHOLE thing !! }
 currEdit := FALSE;
 ;
 GraphicsMenu := GetMenu(GraphicsMenuID);
 InsertMenu(GraphicsMenu, 0);
 currGraphics := TRUE;

 DrawMenuBar;
 END;   { SetUpMenus }

{ ---------------------------------------------------------------------------------------------------------------- 
}
{ Quantify two rectangles for our PICTure.  The 1st is the }
{ window’s portRect, less any Scroll Bar area.  The 2nd is }
{ for the full PICTure centered in the window.  If the     }
{ PICTure is too large to fit, then he topLeft of this     }
{ “fullPICTrect”  is shoved toward the window's topLeft.   }
{ ---------------------------------------------------------------------------------------------------------------- 
}
 PROCEDURE GetPicRects (window: WindowPtr);
 LABEL
 100;
 VAR
 myWindowPic: picHandle;
 tempX, tempY: INTEGER;
 BEGIN
 windPICTrect := window^.portRect;
 ;
 WITH windPICTrect DO {Clip to this before drawing PICT.}
 BEGIN
 IF (ScrollVert(window) <> NIL) | (ScrollHoriz(window) <> NIL) THEN
 BEGIN
 right := (right + 1) - scrollWidth;
 bottom := (bottom + 1) - scrollHeight;
 END;   { IF }
 END;   { WITH }

 myWindowPic := picHandle(GetWRefCon(window));
 IF myWindowPic = NILTHEN
 BEGIN
 fullPICTrect := windPICTrect;
 GOTO 100;
 END;   { IF myWindowPic = NIL }

 WITH windPICTrect DO
 BEGIN
 tempX := right - left;
 tempY := bottom - top;
 END;   { WITH }

 WITH myWindowPic^^.picFrame DO
 BEGIN
 tempX := tempX - (right - left); {window - PICT width}
 tempY := tempY - (bottom - top); {window - PICT height}
 END;   { WITH }
 IF tempX < 0 THEN
 tempX := 0;
 IF tempY < 0 THEN
 tempY := 0;

 WITH fullPICTrect DO {_DrawPicture within this for 1:1}
 BEGIN
 top := windPICTrect.top + tempY DIV 2;
 bottom := top + (myWindowPic^^.picFrame.bottom - myWindowPic^^.picFrame.top);
 left := windPICTrect.left + tempX DIV 2;
 right := left + (myWindowPic^^.picFrame.right - myWindowPic^^.picFrame.left);
 END;   { WITH }
100:
 scrolledFullPICTrect := fullPICTrect;
{ I lied ... a 3rd rect for scrolling. }

 END;   { GetPicRects }

 PROCEDURE RememberPicRects;
 BEGIN
 saveWindPICTrect := windPICTrect;
 saveFullPICTrect := fullPICTrect;
 saveScrolledFullPICTrect := scrolledFullPICTrect;
 END;   { RememberPicRects }
{ ---------- }
 PROCEDURE ResetPicRects;
 BEGIN
 windPICTrect := saveWindPICTrect;
 fullPICTrect := saveFullPICTrect;
 scrolledFullPICTrect := saveScrolledFullPICTrect;
 END;   { ResetPicRects }
{ ---------- }
 PROCEDURE ResetCtls (windPtr: WindowPtr);
 VAR
 oldClip: RgnHandle;
 HCtlValue, VCtlValue: INTEGER;
 PROCEDURE SetMyCtlValue (ctlHndl: ControlHandle; value: INTEGER);
 VAR
 temp: Rect;
 BEGIN
 IF ctlHndl = NIL THEN
 EXIT(SetMyCtlValue);
 
 temp := ctlHndl^^.contrlRect;
 InsetRect(temp, 1, 1);
 ClipRect(temp);
 SetCtlValue(ctlHndl, value);
 END;   { SetMyCtlValue }
 BEGIN   { ResetCtls }
 oldClip := NewRgn;
 GetClip(oldClip);
 
 HCtlValue := -(scrolledFullPICTrect.left - fullPICTrect.left) DIV 12;
 VCtlValue := -(scrolledFullPICTrect.top - fullPICTrect.top) DIV 12;
 SetMyCtlValue(ScrollHoriz(windPtr), HCtlValue);
 SetMyCtlValue(ScrollVert(windPtr), VCtlValue);
 SetClip(oldClip);
 DisposeRgn(oldClip);
 END;   { ResetCtls }

{ -------------------------------------------------------------------------------------------------------- 
}
{ Make a separate PROC so we can zoom independently of }
{ _TrackBox, for example, in response to a Menu        }
{ selection or a keypress:                             }
{ -------------------------------------------------------------------------------------------------------- 
}
 PROCEDURE doZoom (window: WindowPtr; partCode: INTEGER);
 VAR
 oldPort: GrafPtr;
 tempRect, srcZoomRect, dstZoomRect: Rect;
 PROCEDURE AdjustWindRect (window: WindowPtr; VAR r: Rect);
 CONST
 frame = 1;
 shadow = 1;
 title = 18;
 VAR
 windDef: INTEGER;
 BEGIN   { AdjustWindRect }
 windDef := GetWVariant(window);
 InsetRect(r, -frame, -frame);
    { ---- }
 IF (windDef = 0) OR (windDef > 3) THEN
 r.top := r.top - title;  { Window has a title bar. }
    { ---- }
 IF (windDef = documentProc) OR (windDef = altDBoxProc) OR (windDef = 
noGrowDocProc) OR (windDef = zoomDocProc) THEN
 WITH r DO   { Window has a shadow frame. }
 BEGIN
 bottom := bottom + shadow;
 right := right + shadow;
 END;   { WITH r }
 END;   { AdjustWindRect }

 BEGIN   { doZoom }
 IF NOT applWind THEN
 EXIT(doZoom);
 
 GetPort(oldPort);
 SetPort(window);

 CASE partCode OF
 inZoomOut: 
 BEGIN
 IF NOT WindowPeek(window)^.spareFlag THEN
 BEGIN   { no Zoom box. }
 tempRect := screen;
 InsetRect(tempRect, 2, 2);   { Max zoom rect. }
 
 CalcWindowFrame(window, srcZoomRect);
 LocalGlobal(srcZoomRect);
 zoomBackIn := srcZoomRect;   { Save for ... }
 dstZoomRect := tempRect;
 END

 ELSE   { has a Zoom box. }

 BEGIN
 stateHandle := WStateHdl(WindowPeek(window)^.dataHandle);
 
 WITH stateHandle^^ DO
 BEGIN
 srcZoomRect := userState;
 dstZoomRect := stdState;
 { ONLY portRects ... so we need to adjust the sizes: }
 AdjustWindRect(window, srcZoomRect);
 AdjustWindRect(window, dstZoomRect);
 END;   { WITH stateHandle^^ }
 END;   { ELSE has a Zoom box }
      { ---------- }
 ZoomRect(srcZoomRect, dstZoomRect);
 PlaySound('ZoomOut');

 ShowHide(window, FALSE); { NOW, wave the magic wand.}
 InvalidScroll(window);
 RememberPicRects;
 ZoomWindow(window, partCode, TRUE);
 GetPicRects(window);  { ... for NEW portRect. }
 ScrollResize(window);
 
 InvalidScroll(window);
 ShowHide(window, TRUE);

 nextState := inZoomIn;
 END;   { inZoomOut }
 inZoomIn: 
 BEGIN
 IF NOT WindowPeek(window)^.spareFlag THEN
 BEGIN
 tempRect := screen;
 InsetRect(tempRect, 2, 2);   { Max zoom rect. }
 srcZoomRect := tempRect;
 dstZoomRect := zoomBackIn;
 END   { no Zoom box. }
 ELSE
 BEGIN
 stateHandle := WStateHdl(WindowPeek(window)^.dataHandle);
 
 WITH stateHandle^^ DO
 BEGIN
 srcZoomRect := stdState;
 dstZoomRect := userState;
 
 AdjustWindRect(window, srcZoomRect);
 AdjustWindRect(window, dstZoomRect);
 END;   { WITH stateHandle^^ }
 END;   { ELSE has a Zoom box }
      { ---------- }
 ZoomRect(srcZoomRect, dstZoomRect);
 PlaySound('ZoomIn');

 ShowHide(window, FALSE);  { Magic wand time !! }
 InvalidScroll(window);
 
 ZoomWindow(window, partCode, TRUE);
 ScrollResize(window);
 ResetPicRects;
 SetMaxCtls(window);{ For IMMEDIATE seeing of    }
 ResetCtls(window); {former control values -- SIGH!!}
 
 InvalidScroll(window);
 ShowHide(window, TRUE);

 nextState := inZoomOut;
 END;   { inZoomIn }

 OTHERWISE               { Nada !! }
 BEGIN
 END;

 END;   { CASE }
 SetPort(oldPort);
 END;   { doZoom }

 PROCEDURE HandleMouse;
 VAR
 tempRect: rect;
 newSize: LONGINT;
 windWidth, windHt: INTEGER;
 mouseLoc: Point;
 theControl: ControlHandle;
 partControl: INTEGER;
 BEGIN
 CASE windowLoc OF
 inDesk: 
 BEGIN
 END;   { inDesk }
 inMenuBar: 
 HandleMenu;
 inSysWindow: 
 SystemClick(Event, TheWindow);   { A DA window. }
 inContent: 
 BEGIN
 IF TheWindow <> FrontWindow THEN
 BEGIN
 SelectWindow(TheWindow);
 { Generates an Activate Event. }
 EXIT(HandleMouse);
 END;   { IF TheWindow <> FrontWindow }

 mouseLoc := Event.where;
 GlobalToLocal(mouseLoc);
 partControl := FindControl(mouseLoc, TheWindow, theControl);
 IF partControl <> 0 THEN
 Scroll(theControl, partControl, mouseLoc)
 ELSE IF DoubleClick THEN
 doGraphics(QuitItem);
 END;   { inContent }
 inDrag: 
 BEGIN
 IF DoubleClick & (nextState = inZoomOut) THEN
 BEGIN
 doZoom(TheWindow, inZoomOut);
 EXIT(HandleMouse);
 END;   { IF ... }

 tempRect := screen;
 WITH TheWindow^.portRect DO
 BEGIN
 windWidth := right - left;
 windHt := bottom - top;
 END;   { WITH TheWindow^.portRect }
 
 WITH tempRect DO
 BEGIN
 left := left + windWidth DIV 10;
 right := right - windWidth DIV 10;

 IF (windHt DIV 10 > mBarHt) THEN
 BEGIN
 top := top + windHt DIV 10;
 bottom := bottom - windHt DIV 10;
 END
 ELSE
 BEGIN
 top := top + mBarHt;
 bottom := bottom - mBarHt;
 END;   { ELSE }

 END;   { WITH tempRect }

 { _DragWindow forces the Mouse to stay inside of tempRect. }
 DragWindow(TheWindow, Event.where, tempRect);

    { This craziness ????? is required because I zoom the   }
    { window in response to a keypress.  I call _SizeWindow }
    { with NO effective change just to re-quantify the      }
    { userState in the WStateRec(ord).                      }
 WITH TheWindow^.portRect DO
 SizeWindow(TheWindow, right - left, bottom - top, FALSE); { NO update 
!! }

 GetMouse(mouseLoc);
 LocalToGlobal(mouseLoc);
 IF PtInRect(mouseLoc, tempRect) THEN
 { It’s a drag, allright !! }
 nextState := inZoomOut;
      { ELSE NO change !! }
 END;   { inDrag }

 inGrow: 
 BEGIN
 WITH screen DO
 BEGIN
 SetRect(tempRect, left, top, right - left, bottom - top);
 InsetRect(tempRect, mBarHt, mBarHt);
 END;   { WITH screen }

 newSize := GrowWindow(TheWindow, Event.where, tempRect);
 IF newSize = 0 THEN
 EXIT(HandleMouse); { NO change. }

 EraseRect(TheWindow^.portRect); { The OLD portRect.}
       { InvalRect(TheWindow^.portRect);   --   passed TRUE to _SizeWindow. 
}
 SizeWindow(TheWindow, LoWord(newSize), HiWord(newSize), TRUE);
 GetPicRects(TheWindow); 
 {_SizeWindow’s NEW portRect affects our picFrame.}
 ScrollResize(TheWindow);
 SetCtlsToMin(TheWindow);
 InvalRect(TheWindow^.portRect);

 nextState := inZoomOut;
 END;   { inGrow }

 inGoAway: 
 BEGIN
 IF TrackGoAway(TheWindow, Event.where) THEN
 DoQuit;
 END;   { inGoAway }

 inZoomOut, inZoomIn: 
 IF TrackBox(TheWindow, Event.where, windowLoc) THEN
 doZoom(TheWindow, windowLoc);

 END;   { CASE }

 END;   { HandleMouse }

 PROCEDURE HandleKey;
 VAR
 keyASCII: INTEGER;
 key: char;
 BEGIN
 IF NOT applWind THEN
 EXIT(HandleKey);

 IF BitAnd(Event.modifiers, $0F00) = cmdKey THEN
 { ONLY the Command Key }
 HandleMenu
 ELSE
 BEGIN
 keyASCII := BitAnd(Event.message, CharCodeMask);
 key := CHR(keyASCII);
 IF (key = ‘z’) | (key = ‘Z’) THEN
 doZoom(FrontWindow, nextState)
 ELSE
 SysBeep(10);
 END;   { ELSE no Command Key }
 END;   { HandleKey }

{ ===================================================== }
{ HandleUpdate re-draws any controls, text, or PICTs as }
{ well as the Grow Icon.                                }
{ ===================================================== }
 PROCEDURE HandleUpdate;
 VAR
 oldPort: GrafPtr;
 window: WindowPtr;
 HcntlHdl, VcntlHdl: ControlHandle;
 BEGIN
 GetPort(oldPort);
 window := WindowPtr(Event.message);
 SetPort(window);
 HcntlHdl := ScrollHoriz(window);
 VcntlHdl := ScrollVert(window);

 BeginUpDate(window);
 
 ClipRect(window^.portRect);
 EraseRect(window^.portRect);
 DrawControls(window);
 IF (HcntlHdl <> NIL) | (VcntlHdl <> NIL) THEN
 DrawGrowIcon(window);
 { Clip to the window LESS Scroll Bar(s). }
 ClipRect(windPICTrect); 
 DrawPicture(monsterPicHdl, scrolledFullPICTrect); 
 { ... but still draw 1:1 }
 ClipRect(window^.portRect); 
{ Reset to see Scroll Bars move and be highlighted -- Sigh !! }
 EndUpdate(window);

 SetPort(oldPort)
 END;   { HandleUpdate }

{ ---------------------------------------------------------------------------------------------------- 
}
{ Need to separate them because we’re trying to make }
{ this blasted thing MultiFinder-compatible:         }
{ ---------------------------------------------------------------------------------------------------- 
}
 PROCEDURE DoActivate (window: WindowPtr);
 VAR
 HcntlHdl, VcntlHdl: ControlHandle;
 BEGIN
 SetPort(window);
 windDef := GetWVariant(window); {In DisplayWindow, also.}

 HcntlHdl := ScrollHoriz(window);
 IF HcntlHdl <> NIL THEN
 HiliteControl(HcntlHdl, 0);
 VcntlHdl := ScrollVert(window);
 IF VcntlHdl <> NIL THEN
 HiliteControl(VcntlHdl, 0);

 IF (HcntlHdl <> NIL) | (VcntlHdl <> NIL) THEN
 DrawGrowIcon(window);

 IF aMac2 & (colorHandCrsr = NIL) THEN
 { Color me paranoid !! }
 colorHandCrsr := GetCCursor(HANDcrsrID);
 END;   { DoActivate }

 PROCEDURE DoDeactivate (window: WindowPtr);
 VAR
 HcntlHdl, VcntlHdl: ControlHandle;
 BEGIN
 HcntlHdl := ScrollHoriz(window);
 IF HcntlHdl <> NIL THEN
 HiliteControl(HcntlHdl, 255);
 
 VcntlHdl := ScrollVert(window);
 IF VcntlHdl <> NIL THEN
 HiliteControl(VcntlHdl, 255);

 IF (HcntlHdl <> NIL) | (VcntlHdl <> NIL) THEN
 DrawGrowIcon(window);

 IF aMac2 & (colorHandCrsr <> NIL) THEN
 BEGIN
 DisposCCursor(colorHandCrsr);
 colorHandCrsr := NIL;   { Mark as gone !! }
 stillColorCrsr := FALSE;
 END;   { IF aMac2 & () }
 END;   { DoDeactivate }

 PROCEDURE HandleActivate;
 VAR
 window: WindowPtr;
 BEGIN
 window := WindowPtr(Event.message);

 IF ODD(Event.modifiers) THEN
 DoActivate(window)
 ELSE
 DoDeactivate(window);
 END;   { HandleActivate }

 PROCEDURE DoPeriodic;
 VAR
 ignoreError: OSErr;
 BEGIN
 IF NOT WNE THEN
 SystemTask;

 colorDepth := TestForColor;
 PeriodicMenus;  { Feeds HandleCursor. }
 HandleCursor;
 
 IF Sleep = 1 THEN
 Sleep := GetCaretTime;  { Reset after special effects. }
 
 IF applWind & InForeGround THEN
 BEGIN
 SetMaxCtls(FrontWindow);

 IF justOpened THEN
 BEGIN
        justOpened := FALSE;{ Just once, Sam !! }
 SpiffyDissolve;

 { Retrieve Scroll Bars AFTER the        }
 { dissolve so they don’t get in the way:}           
 horizControl := GetNewControl(horizScrollID, TheWindow);
 vertControl := GetNewControl(vertScrollID, TheWindow);
 ScrollResize(TheWindow);
 GetPicRects(TheWindow);

 InvalRect(TheWindow^.portRect); {NOW do Update !!}
 END;   { IF justOpened }

 IF justBragging THEN
 BEGIN
 justBragging := FALSE;
 SpiffyRoll;
 END;   { IF justBragging }

 END;   { IF applWind & InForeGround }

 END;   { DoPeriodic }
 PROCEDURE MainEventLoop;
 VAR
 ignoreResult: BOOLEAN;
 BEGIN
 REPEAT
 IF WNE THEN
 ignoreResult := WaitNextEvent(everyEvent, Event, Sleep, NIL)
 ELSE
 ignoreResult := GetNextEvent(everyEvent, Event);

 CASE Event.what OF
 NullEvent: 
 DoPeriodic;
 MouseDown: 
 BEGIN
        { Fills in 'TheWindow'. }
 windowLoc := FindWindow(Event.where, TheWindow);
 HandleMouse;
 END;
 MouseUp: 
 BEGIN
 END;
 KeyDown, AutoKey: 
 HandleKey;
 KeyUp: 
 BEGIN
 END;
 UpdateEvt: 
 HandleUpdate;
 DiskEvt: 
 BEGIN
 MouseDown: 
 BEGIN
 windowLoc := FindWindow(Event.where, TheWindow);
 { Fills in ‘TheWindow’. }
 HandleMouse;
 END;
 MouseUp: 
 BEGIN
 END;
 KeyDown, AutoKey: 
 HandleKey;
 KeyUp: 
 BEGIN
 END;
 UpdateEvt: 
 HandleUpdate;
 DiskEvt: 
 BEGIN
 END;
 ActivateEvt: 
 HandleActivate;
 NetworkEvt, DriverEvt: 
 BEGIN
 END;
 App1Evt, App2Evt, App3Evt: 
 BEGIN
 END;
 OSEvent:   { MultiFinder Event = app4Evt }
 BEGIN
 CASE BSR(Event.message, 24) OF   { High byte }
 mouseMovedMessage: 
 HandleCursor;

 suspendResumeMessage: 
 BEGIN
 IF BAND(Event.message, resumeMask) <> 0 THEN
 BEGIN
 InForeGround := TRUE;
 DoActivate(FrontWindow)
 END   { Resume }
 ELSE   { Suspend }
 BEGIN
 InForeGround := FALSE;
 DoDeactivate(FrontWindow);
 END;   { ELSE }
 END;   { suspendResumeMessage }

 OTHERWISE
 END;   { CASE BSR(Event.message, 24) OF }
 END;   { MultiFinder Event }

 OTHERWISE
 END;  { CASE Event.what OF }
 UNTIL Done;
 END;   { MainEventLoop }

BEGIN   { Program }
 InitManagers;   { The usual stuff ... }

 PlaySound(‘Oops’);

 Done := FALSE;
 aMac2 := TestForMac2;
 colorHandCrsr := NIL;
 stillColorCrsr := FALSE;
 InForeGround := TRUE;   { Assume UniFinder. }
 WNE := WNEisImplemented;
 Sleep := GetCaretTime;
 acurHdl := NIL;   { See “RemoveVBLTask”. }
 nextState := inZoomOut;
 SetUpMenus;

 screen := RgnHandlePtr(GrayRgn)^^^.rgnBBox;
 
 ROM := wordPtr(ROM85Loc);
 IF ROM^ > 0 THEN
 mBarHt := wordPtr(mBarHeightLoc)^
 ELSE
 mBarHt := 20;

 monsterPicHdl := GetPicture(monsterID);
 IF Handle(monsterPicHdl) = NIL THEN
 GOTO 100;
 HLock(Handle(monsterPicHdl));

 IF aMac2 THEN
 TheWindow := GetNewCWindow(mainWindowID, NIL, WindowPtr(-1))
 ELSE
 TheWindow := GetNewWindow(mainWindowID, NIL, WindowPtr(-1));

 IF TheWindow = NIL THEN
 BEGIN
 HUnlock(Handle(monsterPicHdl));
 ReleaseResource(Handle(monsterPicHdl));
 GOTO 100;
 END;   { IF TheWindow = NIL }
 SetPort(TheWindow);

{ Retrieve Scroll Bars AFTER the dissolve }
{ so they don’t get drawn pre-maturely.   }
 SetWindowPalette(TheWindow, mainWindowID);
 { Palette ID = Window ID. }
 SetWRefCon(TheWindow, LONGINT(monsterPicHdl)); 
 { Save for scrolling later. }
 DisplayWindow(TheWindow);
 ValidRect(TheWindow^.portRect); 
 { Postpone Update until AFTER the dissolve. }
 justOpened := TRUE;  { See “DoPeriodic” ... }
 justBragging := FALSE;

 MainEventLoop;
 PlaySound(‘Moof’);
100:
 ExitToShell;
END.   { Program }

 
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