TweetFollow Us on Twitter

TML Pascal Tricks
Volume Number:6
Issue Number:3
Column Tag:Pascal Procedures

TML Pascal Tricks

By Paul Diegenbach, Amsterdam, the Netherlands

XCMD - drawing in a Hypercard stack

The attractiveness of Hypercard is for a large part due to it graphical possibilities. Nice cards always mean nice graphics. The Hypertalk language allows drawing on the screen under program control. When we tear the tools menu off the menubar, we can actually see the actions as the tools flop from pen to brush to marquee and so on. Nice to watch, but oh so slow. Ever tried to draw a complicated graph in Hypercard? I tried it in an attempt to simulate the differentiation of an egg to all the different cells an embryo consists of. One of the theories implies the evaluation of some differential equations and then drawing a thousand points on the screen.

The idea was to let students be able to change the parameters in the equations and see the results in a user-friendly environment. The first step was to implement the equation solving in Hypertalk. Too slow, so an XCMD was quickly written. Drawing the results by Hypertalk: still to slow, so why not do the drawing in the XCMD as well? In a first result the drawing looks nice, but as soon as Hypercard updates the screen from its offscreen bitmap, the drawing disappears. The solution to this problem is to copy the drawing in the paste buffer (scrap) and paste it into Hypercard using the paste command from the menu. This combination works fine and quick. The skeleton for the XCMD is given below, in TML-Pascal, with a Fourier-demo in the drawing part to make it less dumb. In this demo we use parameters from Hypercard for the size of the rectangle and for the Fourier coefficients. Although not necessary, it is often handy to give the rectangle parameters. They can easily be estimated by having a temporary field of the same size and asking in the message window ‘put the size of card field tmp into msg’. The Hypercard stack with this demo implemented is on the source disk for this month.

To avoid flicker between the copy and paste, it is convenient to lock the screen before the XCMD is used. Users of other Pascals sometimes need to remove the ParamPtr parameter, that is the first parameter in every call to the glue routines:

{1}

UNIT PictToScrp;
(******************************************************      
This XCMD demodnstrates a method to plot and calculate in Pascal (perhaps 
with floating point processor enabled) and then copy and paste the picture 
in the card compile and link as follows (assuming Fourier is an existing 
stack):
  
  TMLPascal Fourier.p
or:  ( really fast on a mac II)
  TMLPascal Fourier.p  -MC68020 -MC68881 -d Elems881=true

  Link -w -t ‘STAK’ -c ‘WILD’ 
  -m FOURIER -rt XCMD=1282 -sg Fourier 
   Fourier.p.o 
   “{Libraries}”Runtime.o 
   “{Libraries}”Interface.o 
   “{TMLPLibraries}”TMLPasLib.o 
   “{Libraries}”HyperXLib.o 
   -o “Fourier”

 Hypercard call :
  set the lockscreen to true
  -- prevents flicker
  Fourier  330,14,480,319,10,7,5,3,4
  -- 330,14,480 is the area to draw into
  -- 10,7,5,3,4  are the fourier factors times 10
  set the lockscreen to false
 ******************************************************)

INTERFACE

  USES MemTypes, QuickDraw, OSIntf, ToolIntf, PackIntf, PasLibIntf, HyperXCMD;

  PROCEDURE Fourier(ParamPtr: XCMDPtr);

IMPLEMENTATION

  PROCEDURE PictScrap(ParamPtr: XCMDPtr); FORWARD;

  PROCEDURE Fourier(ParamPtr: XCMDPtr);
    BEGIN
      PictScrap(ParamPtr);
    END;

  PROCEDURE PictScrap(ParamPtr: XCMDPtr);
    VAR
      thePoint     : Point;
      hPicture     : PicHandle;
      rg           : rect;
      Piclength    : LONGINT;
      xoffset, yoffset: integer;
      str          : str255;
      xLeft, bot, top, xRight: LONGINT;
      one, two, three, four, five: LONGINT;
      x, y         : extended;
      z1, z2, z3, z4, z5: extended;

PROCEDURE MyDrawing;
 { all your drawing stuff goes here }
      VAR
        i            : integer;
        maxim, offset: extended;

      FUNCTION Sinus(x: extended): extended;
        BEGIN
          Sinus := sin(x) * z1 + sin(2 * x) * z2 + sin(3 * x) * z3 + 
sin(4 * x)  * z4 + sin(5 * x) * z5
 { the more, the better }
        END;

      BEGIN
        eraserect(rg);
        Framerect(rg); { optional }
        offset := top + (bot - top) / 2.0;
        z1 := one / 10.0;
        z2 := two / 10.0;
        z3 := three / 10.0;
        z4 := four / 10.0;
        z5 := five / 10.0;
        x := 0.02 {1 / 50} ;
        maxim := Sinus(x);
        FOR i := 2 TO 314 DO
          BEGIN
          IF i MOD 10 = 0 THEN
SendCardMessage(ParamPtr, ‘set cursor to busy’);
          x := i / 50;
          y := Sinus(x);
          IF maxim < y THEN
            maxim := y;
          END;

        x := 1 / 50;
        y := Sinus(x);
        maxim := 100 / maxim;
SendCardMessage(ParamPtr, ‘set cursor to busy’);
        moveto(xLeft + 1, round(y * maxim + offset));
        FOR i := 2 TO 314 DO
          BEGIN { for two pi }
          x := i / 50;
          y := Sinus(x);
lineto(i + xLeft + 1, round(y * maxim + offset))
          END;
SendCardMessage(ParamPtr, ‘set cursor to busy’);
        penpat(ltgray);
        moveto(xLeft + 1, round(offset));
        lineto(xRight - 2, round(offset));
        pennormal
      END;

    FUNCTION GetParameter(n: integer): LONGINT;
      VAR
        tmp          : LONGINT;
      BEGIN
        ZeroToPas(ParamPtr, ParamPtr^.params[n]^, str);
        stringToNum(str, tmp);
        GetParameter := tmp
      END;

    BEGIN
      IF ParamPtr^.paramCount <> 9 THEN
        SendCardMessage(ParamPtr, ‘put “wrong number of parameters” into 
msg’)
{ I think a more convenient way of error report than by ParamPtr^.ReturnValue 
}
      ELSE
        BEGIN
{get the drawing rectangle coordinates from hypercard }
        xLeft := GetParameter(1);
        top := GetParameter(2);
        xRight := GetParameter(3);
        bot := GetParameter(4);

{ In this example : get Fourier coëfficients from hypercard }
        one := GetParameter(5);
        two := GetParameter(6);
        three := GetParameter(7);
        four := GetParameter(8);
        five := GetParameter(9);
        setrect(rg, xLeft, top, xRight, bot);
        xoffset := xLeft + 5;
        yoffset := top + 5;
        cliprect(rg);
        hPicture := OpenPicture(rg);
        Showpen;
        MyDrawing; { here all your drawing }
        closepicture;
        Piclength := GethandleSize(handle(hPicture));
        IF ZeroScrap + putscrap(Piclength, ‘PICT’, ptr(hPicture^)) = 
NoErr THEN
     ParamPtr^.ReturnValue := PasToZero(ParamPtr, ‘’)
        ELSE
          ParamPtr^.ReturnValue := PasToZero(ParamPtr, ‘something wrong’);
SendCardMessage(ParamPtr, ‘choose select tool’);
SendCardMessage(ParamPtr, ‘domenu “Paste Picture”’);
SendCardMessage(ParamPtr, ‘choose browse tool’);
        END
    END;
END.

Small and Dirty “Write Always”

In the debugging of large programs we were accustomed to put a lot of ‘writeln’s’ in the source text to show what was happening. Although a workable solution on mainframes and mini’s, that’s not so easy in the Macintosh environment, there is not always a window available to write in. The following small subroutine (TML Pascal version) does the trick with some disadvantage: it overwrite all its lines on top of each other at the bottom of the screen in some kind of status line (bit like Online companion), but, sorry, the line is not automatically removed after leaving the program. Dirty isn’t it, so surely for debugging only. An ‘invalrect’ after each multifinder event and at the end of the program is sometimes a solution.

In the program source you write something like :

--2

 if dbg then DQText(‘now in procedure blahblah’)

(The clever one’s can write a MPW-script to put it after the first begin in every procedure or function) Dbg is used as a constant (or in a compiler directive).

The procedure (as a Pascal unit) looks like :

{3}

UNIT DQTextProcedure;
  INTERFACE
    USES
MemTypes, QuickDraw, OSIntf, ToolIntf, PackIntf, QDaccess;
 
{ Tml pascals QDaccess defines:
 TYPE  QDGlobalsPtr = ^QDGlobalsRec;
    QDGlobalsRec =
      record
        randSeed   :  LongInt;
        screenBits :  BitMap;
        arrow      :  Cursor;
        dkGray     :  Pattern;
        ltGray     :  Pattern;
        gray       :  Pattern;
        black      :  Pattern;
        white      :  Pattern;
        ThePort    :  GrafPtr;
      end;
function QDGlobals: QDGlobalsPtr;external;}

PROCEDURE DQText(Message: Str255);
  IMPLEMENTATION
PROCEDURE DQText(Message: Str255);
VAR
  SavedPort    : GrafPtr;
  LocalPort    : GrafPort;
  TheRect      : Rect;
BEGIN
  WITH QDGlobals^ DO
    BEGIN
      GetPort(SavedPort);
      OpenPort(@LocalPort);
      SetPort(@LocalPort);
      WITH ScreenBits.Bounds DO
 { this is QDGlobals^ s ScreenBits ! }
SetRect(TheRect, Left, Bottom-20, Right, Bottom);
      FillRect(TheRect, White);
      MoveTo(TheRect.Left, TheRect.Top);
      LineTo(TheRect.Right, TheRect.Top);
      MoveTo(TheRect.Left+7, TheRect.Bottom-7);
      DrawString(Message);
      ClosePort(@LocalPort);
      SetPort(SavedPort);
   END;
END;
END.

PROGRAM tstDQtext;
  { test the dqtext procedure : }
  USES MemTypes, QuickDraw, OSIntf, ToolIntf, PackIntf,
    PaslibIntf, QDaccess, DQtext;
  (*
  link as :
    Link  -t ‘APPL’ -c ‘????’ 
      DQtext.p.o 
      tstDQtext.p.o 
      “{Libraries}”Runtime.o 
      “{Libraries}”Interface.o 
      “{TMLPLibraries}”TMLPasLib.o 
      -o tstDQtext
  *)
  BEGIN
    textbook(NIL); { TML pascal simple window }
    writeln(‘ see bottom line’);
    writeln(‘ click mouse button’);
    PLFlush(output);
    DQtext(‘before’);
    REPEAT
    UNTIL button;
    DQtext(‘after mouse button’);
    writeln(‘ type return to end program’);
    readln
  END.

 
AAPL
$100.57
Apple Inc.
+0.04
MSFT
$44.95
Microsoft Corpora
-0.38
GOOG
$584.49
Google Inc.
-2.37

MacTech Search:
Community Search:

Software Updates via MacUpdate

Picasa 3.9.138 - Organize, edit, and sha...
Picasa and Picasa Web Albums allows you to organize, edit, and upload your photos to the Web from your computer in quick, simple steps. Arrange your photos into folders and albums and erase their... Read more
Tidy Up 3.0.15.0 - Find duplicate files...
Tidy Up is a complete duplicate finder and disk-tidiness utility. With Tidy Up you can search for duplicate files and packages by the owner application, content, type, creator, extension, time... Read more
Parallels Desktop 10.0 - Run Windows app...
Parallels Desktop is simply the world's bestselling, top-rated, and most trusted solution for running Windows applications on your Mac. With Parallels Desktop for Mac, you can seamlessly run both... Read more
Apple Final Cut Pro X 10.1.3 - Professio...
Apple Final Cut Pro X is a professional video editing solution.Completely redesigned from the ground up, Final Cut Pro adds extraordinary speed, quality, and flexibility to every part of the post-... Read more
Apple Compressor 4.1.3 - Adds power and...
Compressor adds power and flexibility to Final Cut Pro X export. Customize output settings, work faster with distributed encoding, and tap into a comprehensive set of delivery features. Powerful... Read more
Chromium 36.0.1985.143 - Fast and stable...
Chromium is an open-source browser project that aims to build a safer, faster, and more stable way for all Internet users to experience the web. FreeSMUG-Free OpenSource Mac User Group build is... Read more
Macgo Blu-ray Player 2.10.6.1691 - Blu-r...
Macgo Mac Blu-ray Player can bring you the most unforgettable Blu-ray experience on your Mac. Overview Macgo Mac Blu-ray Player can satisfy just about every need you could possibly have in a Blu-ray... Read more
Apple Motion 5.1.2 - Create and customiz...
Apple Motion is designed for video editors, Motion 5 lets you customize Final Cut Pro titles, transitions, and effects. Or create your own dazzling animations in 2D or 3D space, with real-time... Read more
A Better Finder Rename 9.39 - File, phot...
A Better Finder Rename is the most complete renaming solution available on the market today. That's why, since 1996, tens of thousands of hobbyists, professionals and businesses depend on A Better... Read more
PopChar X 6.6 - Floating window shows av...
PopChar X helps you get the most out of your font collection. With its crystal-clear interface, PopChar X provides a frustration-free way to access any font's special characters. Expanded... Read more

Latest Forum Discussions

See All

Invaders! From Outer Space (Games)
Invaders! From Outer Space 1.0 Device: iOS Universal Category: Games Price: $1.99, Version: 1.0 (iTunes) Description: | Read more »
Dementia: Book of the Dead (Games)
Dementia: Book of the Dead 1.00 Device: iOS Universal Category: Games Price: $2.99, Version: 1.00 (iTunes) Description: EXCLUSIVE CONTENT ONLY ON THE APP STORE. Medieval England. Times of knights, witches and hunters. What other... | Read more »
Wan Nyan Slash (Games)
Wan Nyan Slash 1.0 Device: iOS Universal Category: Games Price: $.99, Version: 1.0 (iTunes) Description: Wan Nyan Slash is an infinite adorable demon slaying slashing action game! Play as the wandering samurai Wan and Nyan as they... | Read more »
Fallin Love - The Game of Love (Games)
Fallin Love - The Game of Love 1.0 Device: iOS Universal Category: Games Price: $.99, Version: 1.0 (iTunes) Description: GRAVITATE AROUND LOVE | Read more »
Ancient Battle: Hannibal (Games)
Ancient Battle: Hannibal 1.0 Device: iOS Universal Category: Games Price: $.99, Version: 1.0 (iTunes) Description: | Read more »
Cubic Castles Review
Cubic Castles Review By Rob Thomas on August 20th, 2014 Our Rating: :: CASTLE CRAFTINGiPad Only App - Designed for the iPad Some ridiculously frustrating camera issues aside, Cubic Castles is a pretty neat, voxel-based crafting... | Read more »
Space Colors – Tips, Tricks, Strategies,...
Hello Cadets: Want to know what we thought about this hectic space combat/roguelike? Check out our Space Colors review! Space Colors is a cool shooter/roguelike from Team Chaos. You travel from planet to planet across a huge galaxy and complete a... | Read more »
Tap Sports Baseball – Tips, Tricks, and...
Tap Sports Baseball is a pretty simple game to learn, but that doesn’t mean it’s an easy game to master, by any means. To start your batting career off well, we thought we’d give you the heads up on some handy tips and tricks. Hey Batter-Batter:... | Read more »
Tap Sports Baseball Review
Tap Sports Baseball Review By Jennifer Allen on August 20th, 2014 Our Rating: :: LET'S PLAY BALLUniversal App - Designed for iPhone and iPad Tap Sports Baseball is briefly fun but lacks some important features.   | Read more »
Earn to Die 2 Set to Drive in to the App...
Earn to Die 2 Set to Drive in to the App Store Later This Year Posted by Ellis Spice on August 20th, 2014 [ permalink ] Not Doppler has announced that Earn to Die 2, a sequel to their successful game | Read more »

Price Scanner via MacPrices.net

Mac Backup Guru 2.0 Drive Backup/Cloneing Uti...
Mac Backup Guru developer MacDaddy has released Mac Backup Guru 2.0, offering new and enhanced advanced features, such as bootable backups, synchronised volumes and folders, and a Snapshot mode that... Read more
Operate GE’s New Free-Standing KItchen Range...
Think you accidentally left the oven on? Switch it off while on the go. The new free-standing Profile™ Series gas and electric ranges are GE’s second cooking appliances, following their wall oven, to... Read more
Apple now offering certified refurbished 2014...
 The Apple Store is now offering Apple Certified Refurbished 2014 MacBook Airs for up to $180 off the cost of new models. An Apple one-year warranty is included with each MacBook, and shipping is... Read more
Best Buy’s College Student Deals: $100 off Ma...
Take an additional $100 off all MacBooks and iMacs, $50 off iPad Airs and iPad minis, at Best Buy Online with their College Students Deals Savings, valid through September 6th. Anyone with a valid .... Read more
MacBook Airs on sale for $100 off MSRP, free...
B&H Photo has three 2014 MacBook Airs on sale for $100 off MSRP. Shipping is free, and B&H charges NY sales tax only. They also include free copies of Parallels Desktop and LoJack for Laptops... Read more
Razer Taipan Mouse For Gamers And Non-Gamers...
If you’re a serious gamer on either Mac or Windows PCs, a serious gaming mouse is a necessity for first-tier performance. However, even if like me you’re not much of a gamer, there’s still a strong... Read more
15-inch 2.2GHz MacBook Pro on sale for $1899,...
Adorama has the new 15″ 2.2GHz Retina MacBook Pro on sale for $1899 including free shipping plus NY & NJ sales tax only. Their price is $100 off MSRP, and it’s the lowest price available for this... Read more
Mid-Size Tablet Shootout Posted: iPad mini wi...
I ‘m curious about how many iPads Apple is actually selling these days. It’s been widely rumored and anticipated that new models with A8 SoCs, 2 GB of RAM, 8 megapixel cameras, and fingerprint... Read more
The 15 Biggest iPad Air Problems And How To A...
What’s this? Fifteen “biggest” problems with the iPad Air? Does that mean there are a lot of smaller problems as well? Say it isn’t so! My old iPad 2 has manifested no hardware problems in three... Read more
TYLT Syncable-Duo, 2-in-1 USB Cable With Appl...
TYLT has introduced the Syncable-Duo, a universal cable solution for charging and syncing data to smartphones and tablets. The Syncable-Duo eliminates the need for multiple cables by incorporating... Read more

Jobs Board

*Apple* Retail - Multiple Positions (US) - A...
Sales Specialist - Retail Customer Service and Sales Transform Apple Store visitors into loyal Apple customers. When customers enter the store, you're also the Read more
Senior Event Manager, *Apple* Retail Market...
…This senior level position is responsible for leading and imagining the Apple Retail Team's global event strategy. Delivering an overarching brand story; in-store, Read more
*Apple* Solutions Consultant - Apple (United...
**Job Summary** The ASC is an Apple employee who serves as an Apple brand ambassador and influencer in a Reseller's store. The ASC's role is to grow Apple Read more
Position Opening at *Apple* - Apple (United...
**Job Summary** Being a Business Manager at an Apple Store means you're the catalyst for businesses to discover and leverage the power, ease, and flexibility of Apple Read more
Position Opening at *Apple* - Apple (United...
**Job Summary** At the Apple Store, you connect business professionals and entrepreneurs with the tools they need in order to put Apple solutions to work in their Read more
All contents are Copyright 1984-2011 by Xplain Corporation. All rights reserved. Theme designed by Icreon.