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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
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<a href="http://developer.apple.com/">ADC Home</a> > <a href="../../referencelibrary/index.html">Reference Library</a> > <a href="../../samplecode/index.html">Sample Code</a> > <a href="../../samplecode/LegacyTechnologies/index.html">Legacy Documents</a> > <a href="../../samplecode/LegacyTechnologies/idxGraphicsImaging-date.html">Graphics & Imaging</a> > <A HREF="javascript:location.replace('index.html');">ZoomRecter</A> >
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<div style="width:100%; position:fixed;"><div align="center" id="watermark" style="position: relative; margin-left:auto; margin-right:auto; z-index:20; width:500px;"><div class="legacybox"><h1>Legacy Document<span class=closebutton><a href="javascript:closeWatermark()"><img src="../../images/closebutton.png" width="14" height="14" border="0" alt="close button"></a></span></h1>
<p><strong>Important: </strong>This document is part of the Legacy section of the ADC Reference Library. This information should not be used for new development.</p>
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<p>Current information on this Reference Library topic can be found here:</p>
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<h2>/CodeWarrior (OS 9)/ZoomRecter.c</h2>
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<p><strong><a href="ZoomRecter.zip">Download Sample</a></strong> (“ZoomRecter.zip”, 44.7K)<BR>
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<pre class="sourcecodebox">/* File: ZoomRecter.c Contains: This snippet shows how to do "Finder" style zooming between two rectangles. The boolean flag "kZoomLarger" controls the proportional direction of the zooming. To get the two rectangles, you drag them out rubberbanded, and the zoom occurs between them. To quit, click the close box. If you want to do zooms between windows, open up a port with the dimensions of the desktop (from GetGrayRgn()). DON'T use this as a sample of how to do rubberband drawing!!! It's sort of hacked together bypassing the event mechanism and just using Button(). Written by: SF Copyright: Copyright © 1992-1999 by Apple Computer, Inc., All Rights Reserved. You may incorporate this Apple sample source code into your program(s) without restriction. This Apple sample source code has been provided "AS IS" and the responsibility for its operation is yours. You are not permitted to redistribute this Apple sample source code as "Apple sample source code" after having made changes. If you're going to re-distribute the source, we require that you make it clear in the source that the code was descended from Apple sample source code, but that you've made changes. Change History (most recent first): 08/2000 JM Carbonized, non-Carbon code is commented out for demonstration purposes. Changed basic code significantly so it would simply work better..... 7/14/1999 KG Updated for Metrowerks Codewarror Pro 2.1 */#include "CarbonPrefix.h"#include <Dialogs.h>#include <Fonts.h> #define kNumSteps 14#define kRectsVisible 4#define kZoomRatio .7#define kDelayTicks 1#define kZoomLarger true // change this to zoom "inward"void InitStuff(void);void ZoomRect(Boolean zoomOut,Rect *smallRect, Rect *bigRect);void CalcRect(Rect *theRect,Rect *smallRect,Rect *bigRect,double stepValue);//Boolean GetRects(Rect *zoomFrom,Rect *zoomTo);void FixRect(Rect *theRect,Rect *rightRect);void doEventLoop();void GetRect(Rect *zoomFrom, Rect *zoomTo);Boolean gDone = false;WindowPtr gWindow;void main(void){ Rect bounds = {44,12,330,500}/*,zoomFrom,zoomTo*/; //Rect tempRect1; //used for carbonization InitStuff(); gWindow = NewWindow(nil,&bounds,"\pDrag Two Rects to Zoom",true,documentProc,(WindowPtr)-1L,true,0); //SetPort(window); SetPortWindowPort(gWindow); /*do { if (GetRects(&zoomFrom,&zoomTo)) ZoomRect(kZoomLarger,&zoomFrom,&zoomTo); //EraseRect(&window->portRect); EraseRect(GetPortBounds(GetWindowPort(window), &tempRect1)); } while (!gDone);*/ doEventLoop(); FlushEvents(everyEvent,0);} void InitStuff(void){ //InitGraf(&qd.thePort); //InitFonts(); //InitWindows(); //InitMenus(); //TEInit(); //InitDialogs(nil); InitCursor(); FlushEvents(everyEvent,0);}void ZoomRect(Boolean zoomLarger,Rect *smallRect, Rect *bigRect){ double firstStep,stepValue,trailer,zoomRatio; short i,step; Rect curRect; unsigned long ticks; Pattern grayPattern; //used in carbonization RgnHandle rgnHandle = NewRgn(); GrafPtr oldPort; Rect tempRect1; GetPort(&oldPort); SetPort(GetWindowPort(gWindow)); //PenPat(&qd.gray); PenPat(GetQDGlobalsGray(&grayPattern)); PenMode(patXor); firstStep=kZoomRatio; for (i=0; i<kNumSteps; i++) { firstStep *= kZoomRatio; } if (!zoomLarger) { zoomRatio = 1.0/kZoomRatio; firstStep = 1.0-firstStep; } else zoomRatio = kZoomRatio; trailer = firstStep; stepValue = firstStep; for (step=0; step<(kNumSteps+kRectsVisible); step++) { // draw new frame if (step<kNumSteps) { stepValue /= zoomRatio; CalcRect(&curRect,smallRect,bigRect,stepValue); FrameRect(&curRect); } // erase old frame if (step>=kRectsVisible) { trailer /= zoomRatio; CalcRect(&curRect,smallRect,bigRect,trailer); FrameRect(&curRect); } QDFlushPortBuffer(GetWindowPort(gWindow), GetPortVisibleRegion(GetWindowPort(gWindow), rgnHandle)); Delay(kDelayTicks,&ticks); } PenNormal(); DisposeRgn(rgnHandle); smallRect->top = bigRect->top = -1; EraseRect(GetPortBounds(GetWindowPort(gWindow), &tempRect1)); SetPort(oldPort);}void CalcRect(Rect *theRect,Rect *smallRect,Rect *bigRect,double stepValue){ theRect->left = smallRect->left + (short)((double)(bigRect->left-smallRect->left)*stepValue); theRect->top = smallRect->top + (short)((double)(bigRect->top-smallRect->top)*stepValue); theRect->right = smallRect->right + (short)((double)(bigRect->right-smallRect->right)*stepValue); theRect->bottom = smallRect->bottom + (short)((double)(bigRect->bottom-smallRect->bottom)*stepValue);}// Old version, would require that you drag 2 rects before letting the event loop continue/*Boolean GetRects(Rect *zoomFrom,Rect *zoomTo){ short numRects = 0; //EventRecord ev; Rect theRect,drawRect; Point firstPt,curPt,oldPt,globalPt; //KeyMap theKeys; WindowPtr window; Boolean result = true; RgnHandle rgnHandle = NewRgn(); PenMode(patXor); do { while (!Button()) { GetMouse(&globalPt); LocalToGlobal(&globalPt); if ((FindWindow(globalPt,&window)==inGoAway) && window==FrontWindow()) { gDone = true; result = false; } GetMouse(&firstPt); oldPt = firstPt; SetRect(&theRect,firstPt.h,firstPt.v,firstPt.h,firstPt.v); } if (gDone) break; while (Button()) { GetMouse(&curPt); if (!EqualPt(curPt,oldPt)) { FixRect(&theRect,&drawRect); FrameRect(&drawRect); oldPt = curPt; theRect.right = curPt.h; theRect.bottom = curPt.v; FixRect(&theRect,&drawRect); FrameRect(&drawRect); } } FixRect(&theRect,&drawRect); if (numRects==0) *zoomFrom = drawRect; else *zoomTo = drawRect; numRects++; QDFlushPortBuffer(GetWindowPort(window), GetPortVisibleRegion(GetWindowPort(window), rgnHandle)); } while (numRects<2); PenNormal(); DisposeRgn(rgnHandle); return result;}*/// New Version of GetRect(s), modified from original to only handle one dragged rect at a time.void GetRect(Rect *zoomFrom, Rect *zoomTo){ static short numRects = 0; Rect theRect,drawRect; Point firstPt,curPt,oldPt; RgnHandle rgnHandle = NewRgn(); GrafPtr oldPort; GetPort(&oldPort); SetPort(GetWindowPort(gWindow)); PenMode(patXor); GetMouse(&firstPt); oldPt = firstPt; SetRect(&theRect,firstPt.h,firstPt.v,firstPt.h,firstPt.v); while (Button()) { GetMouse(&curPt); if (!EqualPt(curPt,oldPt)) { FixRect(&theRect,&drawRect); FrameRect(&drawRect); oldPt = curPt; theRect.right = curPt.h; theRect.bottom = curPt.v; FixRect(&theRect,&drawRect); FrameRect(&drawRect); QDFlushPortBuffer(GetWindowPort(gWindow), GetPortVisibleRegion(GetWindowPort(gWindow), rgnHandle)); } } FixRect(&theRect,&drawRect); if (numRects==0) *zoomFrom = drawRect; else *zoomTo = drawRect; numRects++; QDFlushPortBuffer(GetWindowPort(gWindow), GetPortVisibleRegion(GetWindowPort(gWindow), rgnHandle)); if (numRects >= 2) { ZoomRect(kZoomLarger, zoomFrom, zoomTo); numRects = 0; } PenNormal(); DisposeRgn(rgnHandle); SetPort(oldPort);}void FixRect(Rect *theRect,Rect *rightRect){ if (theRect->right > theRect->left) { rightRect->right = theRect->right; rightRect->left = theRect->left; } else { rightRect->right = theRect->left; rightRect->left = theRect->right; } if (theRect->bottom > theRect->top) { rightRect->bottom = theRect->bottom; rightRect->top = theRect->top; } else { rightRect->bottom = theRect->top; rightRect->top = theRect->bottom; } }void doEventLoop(){ EventRecord anEvent; WindowPtr evtWind; short clickArea; Rect screenRect; Point thePoint; Rect zoomFrom, zoomTo; zoomFrom.top = zoomTo.top = -1; while (!gDone) { if (WaitNextEvent( everyEvent, &anEvent, 0, nil )) { if (anEvent.what == mouseDown) { clickArea = FindWindow( anEvent.where, &evtWind ); if (clickArea == inDrag) { GetRegionBounds( GetGrayRgn(), &screenRect ); DragWindow( evtWind, anEvent.where, &screenRect ); } else if (clickArea == inContent) { if (evtWind != FrontWindow()) SelectWindow( evtWind ); else { thePoint = anEvent.where; GlobalToLocal( &thePoint ); //Handle click in window content here GetRect(&zoomFrom, &zoomTo); } } else if (clickArea == inGoAway) if (TrackGoAway( evtWind, anEvent.where )) gDone = true; } else if (anEvent.what == updateEvt) { evtWind = (WindowPtr)anEvent.message; SetPortWindowPort( evtWind ); BeginUpdate( evtWind ); //Call Draw Function here.... if (zoomFrom.top != -1) FrameRect(&zoomFrom); if (zoomTo.top != -1) FrameRect(&zoomTo); EndUpdate (evtWind); } } }}</pre>
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