TweetFollow Us on Twitter

Resize Objects
Volume Number:7
Issue Number:4
Column Tag:Jörg's Folder

Related Info: Quickdraw

Getting A Handle On Objects

By Jörg Langowski, MacTutor Editorial Board

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

“C++/MacApp - resizing objects”

As promised last month, this time we’ll start adding some code to our MacApp drawing program to change the basic shapes once they’ve been drawn. I have chosen to implement a resize operation; other functions, like changing colors and patterns, manipulating the order of objects, etc., will follow later.

We are going to use an interface similar to MacDraw, where a selected object has a number of small black squares connected with itself that can be used to change its shape. We’ll call them ‘tags’ in the following. Objects that can be circumscribed by a rectangle have eight tags: four on the corners and four on the centers of the edges. Dragging a corner tag will move the two sides of the rectangle adjacent to the corner, while dragging the edge tag will only move the side of the rectangle that contains the tag.

We’ll need code to display the tags, determine whether the mouse was clicked in one of them, and take action (track the mouse) depending on what tag it was clicked in. Of course, all operations should be undoable, but that’s almost implicit in MacApp.

Detecting the mouse click will proceed in two stages: first, we’ll check whether the mouse has been clicked in any one of the eight tags. If so, we’ll create a new command object of class TSizer, which then does the mouse tracking and track feedback. The command object determines where the mouse was clicked exactly, and the tracking and action will depend on the tag.

For the first phase - determining whether the mouse was clicked in one of the tags at all - it is convenient to create a region that consists of all the eight tags. This region is stored in a new instance variable of TBox, fTagRgn, and created when an object is selected and redrawn (see changes to the TBox::DrawShape method in listing 3). Also, the eight tags are stored individually as Rect instance variables.

The changes to the mouse down command handler are shown in listing 2. We shall now create a TSketcher, a TDragger, or a TSizer command object, depending on where the mouse was clicked - outside any object, inside a selected object, or inside one of the tags of a selected object.

In the TSizer::TrackMouse method we determine which of the eight tags was clicked in, and allow for changes in the top, bottom, left and right coordinates of the object (flags pT, pB, pL, pR). While those coordinates are continuously changed in the TrackMove phase of the TrackMouse method, the TrackFeedback method simply redraws the object rectangle in XOR mode. Undoing can be implemented very simply by remembering the old coordinates of the object.

Sounds simple? It is, and again the modifications are only to a very limited part of the total code - one of MacApp’s great advantages. We still have to add one more ‘Buzzword’ to the list of commands that appear after the Undo/Redo menu item (Listing 4), and extend the Make file a little. By now our code has grown too big to fit into one segment (compiling in Debug mode). Thus, you’ll also see how to segment a MacApp program.

I have put the code that is supposed to go into the new segment into the file TBox.cp, containing TSizer and all the Box/Shape classes. We then have to tell the MacApp builder that this file should be linked in under a different segment name. The necessary changes are shown in listing 5. We add the name of the new source file (TBox.cp) to the list of OtherInterfaces, and the corresponding object file (TBox.cp.o) to the list of OtherLinkFiles. Last, we add the dependency rule for generating the object file (also containing a comment line showing the build progress).

The drawing example will certainly still be extended over the next few months, but we’ll also take up some Forth again soon. Until then.

Listing 1: Changes to TEDrag.h

class TBox : public TObject {
public:
 Rect fLocation;
 BooleanfSelected;
 RgnHandlefTagRgn;
 Rect fTL,fTR,fBL,fBR,
 fT,fB,fL,fR;
 virtual pascal void IBox(Rect *itsLocation);
 virtual pascal void DrawShape();
 virtual pascal void NeedDiskSpace(long *data);
 virtual pascal void Read(short aRefNum);
 virtual pascal void Write(short aRefNum);
#ifdef qDebug
 virtual pascal void Fields(pascal void (*DoToField) 
 (StringPtr fieldName, Ptr fieldAddr, 
 short fieldType, void *link), void *link);
#endif
};

class TSizer : public TCommand {
public:
 TTEDocument   *fTEDocument;
 TTextView*fTextView;
 TBox   *fBox;   RectoldLocation;  RectnewLocation;      Point 
 fStart;  // mouse pressed here
 Point  fDelta;  // offset moved
 BooleanpT,pB,pL,pR; 
 // flags to indicate which coordinates to change
 pascal void ISizer(TBox *itsBox, 
 TTEDocument *itsDocument, TTextView *itsView);
 pascal struct TCommand *TrackMouse
 (TrackPhase aTrackPhase, VPoint *anchorPoint, 
 VPoint *previousPoint, VPoint *nextPoint, 
 Boolean mouseDidMove);
 pascal void TrackFeedback
 (VPoint *anchorPoint, VPoint *nextPoint,
 Boolean turnItOn, Boolean mouseDidMove);
 pascal void DoIt();
 pascal void RedoIt();
 pascal void UndoIt();
#ifdef qDebug
 virtual pascal void Fields(pascal void (*DoToField) 
 (StringPtr fieldName, Ptr fieldAddr, 
 short fieldType, void *link), void *link);
#endif
};
Listing 2: Change to TTextView::DoMouseCommand (file TEDrag.cp)
   
 if (aFindBoxStruct.myBox->fSelected)
 { if (info->theShiftKey) 
 { aFindBoxStruct.myBox->fSelected = false;
 InvalidRect (&aFindBoxStruct.myBox->fLocation);
 return inherited::DoMouseCommand
 (theMouse,info,hysteresis);   
 }
 else
 { if (PtInRgn(*theMouse,
 aFindBoxStruct.myBox->fTagRgn))
 { aSizer = new TSizer;
 FailNIL(aSizer);
 aSizer->ISizer (aFindBoxStruct.myBox,
  fTEDocument, this);
 return aSizer;   }
 else
 { aDragger = new TDragger;
 FailNIL(aDragger);
 aDragger->IDragger
 (aFindBoxStruct.myBox, fTEDocument, this);
 return aDragger;   }
 }
 }
 else
 {
 if (!info->theShiftKey) 
 { fTEDocument->ForEachShapeDo
 ((DoToObject)Deselect, &aSelectStruct); }
 aFindBoxStruct.myBox->fSelected = true;
 InvalidRect(&aFindBoxStruct.myBox-> fLocation);
 return inherited::DoMouseCommand
 (theMouse,info,hysteresis);
 }
   
Listing 3: TBox.cp
#include <UMacApp.h>
#include <UTEView.h>
#include <ToolUtils.h>
#include “TEDrag.h”

const int kBoxColor= redColor;
const int cSizer = 4001;
// Resizing support, JL 2/91
pascal void TSizer::ISizer(TBox *itsBox, 
 TTEDocument *itsDocument, TTextView *itsView)
{
 TScroller *aScroller;

 aScroller = itsView->GetScroller(true);
 ICommand(cSizer, itsDocument, itsView, aScroller);
 fTEDocument = itsDocument;
 fTextView = itsView;
 fBox = itsBox;  
 pT = false; pB = false; pL = false; pR = false;
 oldLocation = fBox->fLocation;
 newLocation = oldLocation;
}

pascal struct TCommand *TSizer::TrackMouse
 (TrackPhase aTrackPhase, VPoint *anchorPoint, 
 VPoint *previousPoint,  VPoint *nextPoint, 
 Boolean mouseDidMove)
{
 fStart = fTextView->ViewToQDPt(anchorPoint);
 
 if (aTrackPhase == trackPress) {
 if (PtInRect(fStart,&fBox->fTR)) { pT = true; pR = true; }
 else if (PtInRect(fStart,&fBox->fTL))
 { pT = true; pL = true; }
 else if (PtInRect(fStart,&fBox->fBR))
 { pB = true; pR = true; }
 else if (PtInRect(fStart,&fBox->fBL))
 { pB = true; pL = true; }
 else if (PtInRect(fStart,&fBox->fT)) { pT = true; }
 else if (PtInRect(fStart,&fBox->fB)) { pB = true; }
 else if (PtInRect(fStart,&fBox->fL)) { pL = true; }
 else if (PtInRect(fStart,&fBox->fR)) { pR = true; }
 }

 if ((aTrackPhase == trackMove) && mouseDidMove) {
 fDelta = fTextView->ViewToQDPt(nextPoint);
 SubPt(fTextView->ViewToQDPt(anchorPoint), &fDelta);
 
 if ( !((fDelta.h == 0) && (fDelta.v == 0)) ) {                
 if (pT){ newLocation.top = 
 oldLocation.top + fDelta.v;  }
 if (pB){ newLocation.bottom = 
 oldLocation.bottom + fDelta.v; }
 if (pL){ newLocation.left = 
 oldLocation.left + fDelta.h; }
 if (pR){ newLocation.right = 
 oldLocation.right + fDelta.h; }
 }
 }

 if ((aTrackPhase == trackRelease) && mouseDidMove) {
 fDelta = fTextView->ViewToQDPt(nextPoint);
 SubPt(fTextView->ViewToQDPt(anchorPoint), &fDelta);
 if ((fDelta.h == 0) && (fDelta.v == 0))
 { return gNoChanges; }
 fBox->fLocation = newLocation;
 }
 return this;
}

pascal void TSizer::TrackFeedback
 (VPoint *anchorPoint, VPoint *nextPoint,
 Boolean turnItOn, Boolean mouseDidMove)
{
 PenState oldState;
 
 if (mouseDidMove) {
 GetPenState(&oldState);
 PenNormal();
 PenMode(patXor);
 FrameRect(&newLocation);
 SetPenState(&oldState);
 }
}

pascal void TSizer::DoIt()
{fTextView->InvalidRect(&newLocation);
 fTextView->InvalidRect(&oldLocation);   }

pascal void TSizer::RedoIt()  
{  fBox->fLocation = newLocation; DoIt();    }

pascal void TSizer::UndoIt()
{fBox->fLocation = oldLocation; DoIt();      }

#ifdef qDebug
pascal void TSizer::Fields(pascal void (*DoToField) 
 (StringPtr fieldName, Ptr fieldAddr, 
 short fieldType, void *link), void *link)
{
 DoToField(“\pTSizer”, nil, bClass, link);
 DoToField(“\pfTEDocument”, 
 (Ptr) &fTEDocument, bObject, link);
 DoToField(“\pfTextView”, (Ptr) &fTextView, bObject, link);
 DoToField(“\pfBox”, (Ptr) &fBox, bObject, link);
 DoToField(“\poldLocation”, (Ptr) &oldLocation, bRect, link);
 DoToField(“\pnewLocation”, (Ptr) &newLocation, bRect, link);
 DoToField(“\pfStart”, (Ptr) &fStart, bPoint, link);
 DoToField(“\pfDelta”, (Ptr) &fDelta, bPoint, link);
 DoToField(“\ppT”, (Ptr) &pT, bBoolean, link);
 DoToField(“\ppB”, (Ptr) &pB, bBoolean, link);
 DoToField(“\ppL”, (Ptr) &pL, bBoolean, link);
 DoToField(“\ppR”, (Ptr) &pR, bBoolean, link);
 inherited::Fields(DoToField, link);
}
#endif

pascal void TBox::IBox(Rect *itsLocation)
 {    fLocation = *itsLocation; fSelected = false; }

pascal void TBox::DrawShape()
{
 if (fSelected) {
 short halfH, halfV;
 
 halfH = (fLocation.right-fLocation.left)/2;
 halfV = (fLocation.bottom-fLocation.top)/2;
 
 PenSize (1,1);
 ForeColor(blackColor);
 FrameRect(&fLocation);
 
 fTagRgn = MakeNewRgn();
 OpenRgn();
 
 fTL.top = fLocation.top;
 fTL.left = fLocation.left;
 fTL.bottom = fTL.top + 4;
 fTL.right = fTL.left + 4;
 FrameRect(&fTL);
 
 fT.top = fLocation.top;
 fT.bottom = fT.top + 4;
 fT.left = fLocation.left + halfH - 2;
 fT.right = fT.left + 4;
 FrameRect(&fT);
 
 fTR.top = fLocation.top;
 fTR.bottom = fTR.top + 4;
 fTR.right = fLocation.right;
 fTR.left = fTR.right - 4;
 FrameRect(&fTR);
 
 fBL.bottom = fLocation.bottom;
 fBL.top = fBL.bottom - 4;
 fBL.left = fLocation.left;
 fBL.right = fBL.left + 4;
 FrameRect(&fBL);
 
 fB.bottom = fLocation.bottom;
 fB.top = fB.bottom - 4;
 fB.left = fLocation.left + halfH - 2;
 fB.right = fB.left + 4;
 FrameRect(&fB);
 
 fBR.bottom = fLocation.bottom;
 fBR.top = fBR.bottom - 4;
 fBR.right = fLocation.right;
 fBR.left = fBR.right - 4;
 FrameRect(&fBR);
 
 fL.top = fLocation.top + halfV - 2;
 fL.bottom = fL.top + 4;
 fL.left = fLocation.left;
 fL.right = fL.left + 4;
 FrameRect(&fL);
 
 fR.top = fLocation.top + halfV - 2;
 fR.bottom = fR.top + 4;
 fR.right = fLocation.right;
 fR.left = fR.right - 4;
 FrameRect(&fR);
 
 CloseRgn(fTagRgn);
 FillRgn(fTagRgn,qd.black);
 ForeColor(kBoxColor);  }
}
   the rest of the file (TShape and following definitions) stays unchanged 
  
Listing 4: Change to TEDrag.r

#define cSizer   4001
resource ‘cmnu’ (128) {
 128, textMenuProc, allEnabled, enabled, “Buzzwords”,          /* these 
words appear after Undo in the Edit menu */
  {
 “Page Setup Change”, noIcon, noKey, 
 noMark, plain, cChangePrinterStyle;
 “Typing”, noIcon, noKey, noMark, plain, cTyping;
 “Drawing”,  noIcon, noKey, 
 noMark, plain, cDrawBox;
 “Dragging”,  noIcon, noKey, 
 noMark, plain, cDragBox;
 “Resize”,  noIcon, noKey, noMark, plain, cSizer
 }
};
Listing 5: TEDrag.MAMake
AppName = TEDrag
OtherInterfaces =  
 “{SrcApp}TBox.cp”
OtherLinkFiles = 
 “{ObjApp}TBox.cp.o”
“{ObjApp}TBox.cp.o”ƒ 
 “{SrcApp}TBox.cp” 
 “{SrcApp}TEDrag.MAMake” 
  {MacAppIntf} 
  {BuildingBlocksIntf}
 {MAEcho} {EchoOptions} “Compiling:     TBox.cp”
 {MACPlus} 
 {CPlusOptions} 
 -s TBox 
 -i “{SrcApp}” 
 -i “{MACIncludes}” 
 -o “{ObjApp}TBox.cp.o” 
 “{SrcApp}TBox.cp”
OtherRsrcFiles = 
 “{MAObj}Printing.rsrc” 
 “TEOther.rsrc”

 

Community Search:
MacTech Search:

Software Updates via MacUpdate

Air Video Server HD 2.1.0 - Stream video...
Air Video Server HD streams videos instantly from your computer on your iPhone, iPad, iPod touch or Apple TV. No need to worry about converting or transferring files. We took everything that was... Read more
Duplicate Annihilator 5.7.5 - Find and d...
Duplicate Annihilator takes on the time-consuming task of comparing the images in your iPhoto library using effective algorithms to make sure that no duplicate escapes. Duplicate Annihilator... Read more
BusyContacts 1.0.2 - Fast, efficient con...
BusyContacts is a contact manager for OS X that makes creating, finding, and managing contacts faster and more efficient. It brings to contact management the same power, flexibility, and sharing... Read more
Capture One Pro 8.2.0.82 - RAW workflow...
Capture One Pro 8 is a professional RAW converter offering you ultimate image quality with accurate colors and incredible detail from more than 300 high-end cameras -- straight out of the box. It... Read more
Backblaze 4.0.0.872 - Online backup serv...
Backblaze is an online backup service designed from the ground-up for the Mac.With unlimited storage available for $5 per month, as well as a free 15-day trial, peace of mind is within reach with... Read more
Little Snitch 3.5.2 - Alerts you about o...
Little Snitch gives you control over your private outgoing data. Track background activity As soon as your computer connects to the Internet, applications often have permission to send any... Read more
Monolingual 1.6.4 - Remove unwanted OS X...
Monolingual is a program for removing unnecesary language resources from OS X, in order to reclaim several hundred megabytes of disk space. If you use your computer in only one (human) language, you... Read more
CleanApp 5.0 - Application deinstaller a...
CleanApp is an application deinstaller and archiver.... Your hard drive gets fuller day by day, but do you know why? CleanApp 5 provides you with insights how to reclaim disk space. There are... Read more
Fantastical 2.0 - Create calendar events...
Fantastical is the Mac calendar you'll actually enjoy using. Creating an event with Fantastical is quick, easy, and fun: Open Fantastical with a single click or keystroke Type in your event details... Read more
Cocktail 8.2 - General maintenance and o...
Cocktail is a general purpose utility for OS X that lets you clean, repair and optimize your Mac. It is a powerful digital toolset that helps hundreds of thousands of Mac users around the world get... Read more

Pie In The Sky: A Pizza Odyssey (Games)
Pie In The Sky: A Pizza Odyssey 1.0 Device: iOS Universal Category: Games Price: $2.99, Version: 1.0 (iTunes) Description: A game about delivering pizza. In space. | Read more »
Chosen Gives Hopeful Singers, Songwriter...
If YouTube videos and reality TV shows like The Voice have taught us one thing, it’s that there are a lot of people out there who are anxious to show the world their talents. And if they’ve taught us a second thing, it’s that there’s an almost... | Read more »
Android's Popular OfficeSuite Now A...
Once only available for Android devices, OfficeSuite has finally landed on the app store. The Mobile Systems app lets you view, edit, create, and share Word, Excel, and PowerPoint documents as well as convert them to/from PDFs. It's touted as being... | Read more »
Warhammer: Arcane Magic is Coming Soon,...
Turbo Tape Games has announced that they're joining forces with Games Workshop to bring the turn-based strategy board game, Warhammer: Arcane Magic, to life on the iOS. | Read more »
Fast & Furious: Legacy's Creati...
| Read more »
N-Fusion and 505's Ember is Totally...
| Read more »
These are All the Apple Watch Apps and G...
The Apple Watch is less than a month from hitting store shelves, and once you get your hands on it you're probably going to want some apps and games to install. Fear not! We've compiled a list of all the Apple Watch apps and games we've been able to... | Read more »
Appy to Have Known You - Lee Hamlet Look...
Being at 148Apps these past 2 years has been an awesome experience that has taught me a great deal, and working with such a great team has been a privilege. Thank you to Rob Rich, and to both Rob LeFebvre and Jeff Scott before him, for helping me... | Read more »
Hands-On With Allstar Heroes - A Promisi...
Let’s get this out of the way quickly. Allstar Heroes looks a lot like a certain other recent action RPG release, but it turns out that while it’s not yet available here, Allstar Heroes has been around for much longer than that other title. Now that... | Read more »
Macho Man and Steve Austin Join the Rank...
WWE Immortals, by Warner Bros. Interactive Entertainment and WWE, has gotten a superstar update. You'll now have access to Macho Man Randy Savage and Steve Austin. Both characters have two different versions: Macho Man Randy Savage Renegade or Macho... | Read more »

Price Scanner via MacPrices.net

Apple offering refurbished 27-inch 5K iMacs f...
The Apple Store is offering Apple Certified Refurbished 27″ 3.5GHz 5K iMacs for $2119 including free shipping. Their price is $380 off the price of new models, and it’s the lowest price available for... Read more
16GB iPad mini on sale for $199, save $50
Walmart has 16GB iPad minis (1st generation) available for $199.99 on their online store, including free shipping. Their price is $50 off MSRP. Online orders only. Read more
New 128GB MacBook Airs on sale for $50 off MS...
 B&H Photo has 128GB 11″ and 13″ 2015 MacBook Airs on sale today for $50 off MSRP including free shipping plus NY sales tax only: - 11″ 1.6GHz/128GB MacBook Air (Model #MJVM2LL/A): $849 $50 off... Read more
13-inch 2.6GHz Retina MacBook Pro (refurbishe...
The Apple Store has Apple Certified Refurbished 13″ 2.6GHz/128GB Retina MacBook Pros available for $979 including free shipping. Original MSRP for this model was $1299. Read more
Save up to $600 with Apple refurbished Mac Pr...
The Apple Store is offering Apple Certified Refurbished Mac Pros for up to $600 off the cost of new models. An Apple one-year warranty is included with each Mac Pro, and shipping is free. The... Read more
Samsung Galaxy S 6 and Galaxy S 6 edge U.S. P...
Samsung Electronics America, Inc. has announced the Galaxy S 6 and Galaxy S 6 edge will be available in the U.S. beginning April 10, with pre-orders being accepted now. “We have completely reimagined... Read more
13-inch 2.5GHz MacBook Pro (refurbished) avai...
The Apple Store has Apple Certified Refurbished 13″ 2.5GHz MacBook Pros available for $829, or $270 off the cost of new models. Apple’s one-year warranty is standard, and shipping is free: - 13″ 2.... Read more
Save up to $80 on iPad Air 2s, NY tax only, f...
 B&H Photo has iPad Air 2s on sale for $80 off MSRP including free shipping plus NY sales tax only: - 16GB iPad Air 2 WiFi: $469.99 $30 off - 64GB iPad Air 2 WiFi: $549.99 $50 off - 128GB iPad... Read more
iMacs on sale for up to $205 off MSRP
B&H Photo has 21″ and 27″ iMacs on sale for up to $205 off MSRP including free shipping plus NY sales tax only: - 21″ 1.4GHz iMac: $1019 $80 off - 21″ 2.7GHz iMac: $1189 $110 off - 21″ 2.9GHz... Read more
Färbe Technik Offers iPhone Battery Charge LI...
Färbe Technik, which manufactures and markets of mobile accessories for Apple, Blackberry and Samsung mobile devices, is offering tips on how to keep your iPhone charged while in the field: •... Read more

Jobs Board

DevOps Software Engineer - *Apple* Pay, iOS...
**Job Summary** Imagine what you could do here. At Apple , great ideas have a way of becoming great products, services, and customer experiences very quickly. Bring Read more
*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
Sr. Technical Services Consultant, *Apple*...
**Job Summary** Apple Professional Services (APS) has an opening for a senior technical position that contributes to Apple 's efforts for strategic and transactional Read more
Lead *Apple* Solutions Consultant - Retail...
**Job Summary** Job Summary The Lead ASC is an Apple employee who serves as the Apple business manager and influencer in a hyper-business critical Reseller's store Read more
*Apple* Pay - Site Reliability Engineer - Ap...
**Job Summary** Imagine what you could do here. At Apple , great ideas have a way of becoming great products, services, and customer experiences very quickly. Bring Read more
All contents are Copyright 1984-2011 by Xplain Corporation. All rights reserved. Theme designed by Icreon.