source: trunk/doc/html/canvas-example.html

Last change on this file was 190, checked in by rudi, 14 years ago

reference documentation added
File size: 39.2 KB
RevLine 
[190]1<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
2<!-- /home/espenr/tmp/qt-3.3.8-espenr-2499/qt-x11-free-3.3.8/examples/canvas/canvas.doc:1 -->
3<html>
4<head>
5<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
6<title>Canvas Example</title>
7<style type="text/css"><!--
8fn { margin-left: 1cm; text-indent: -1cm; }
9a:link { color: #004faf; text-decoration: none }
10a:visited { color: #672967; text-decoration: none }
11body { background: #ffffff; color: black; }
12--></style>
13</head>
14<body>
15
16<table border="0" cellpadding="0" cellspacing="0" width="100%">
17<tr bgcolor="#E5E5E5">
18<td valign=center>
19 <a href="index.html">
20<font color="#004faf">Home</font></a>
21 | <a href="classes.html">
22<font color="#004faf">All&nbsp;Classes</font></a>
23 | <a href="mainclasses.html">
24<font color="#004faf">Main&nbsp;Classes</font></a>
25 | <a href="annotated.html">
26<font color="#004faf">Annotated</font></a>
27 | <a href="groups.html">
28<font color="#004faf">Grouped&nbsp;Classes</font></a>
29 | <a href="functions.html">
30<font color="#004faf">Functions</font></a>
31</td>
32<td align="right" valign="center"><img src="logo32.png" align="right" width="64" height="32" border="0"></td></tr></table><h1 align=center>Canvas Example</h1>
33
34
35<p>
36This example shows a <a href="qcanvas.html">QCanvas</a> and some <a href="qcanvasitem.html">QCanvasItem</a>s in action.
37You can do a lot more with QCanvas than we show here, but the
38example provides a taste of what can be done.
39<p> <hr>
40<p> Header file:
41<p> <pre>#ifndef EXAMPLE_H
42#define EXAMPLE_H
43
44#include &lt;<a href="qpopupmenu-h.html">qpopupmenu.h</a>&gt;
45#include &lt;<a href="qmainwindow-h.html">qmainwindow.h</a>&gt;
46#include &lt;<a href="qintdict-h.html">qintdict.h</a>&gt;
47#include &lt;<a href="qcanvas-h.html">qcanvas.h</a>&gt;
48
49class BouncyLogo : public <a href="qcanvassprite.html">QCanvasSprite</a> {
50 void initPos();
51 void initSpeed();
52public:
53 BouncyLogo(QCanvas*);
54 void advance(int);
55 int rtti() const;
56};
57
58
59class FigureEditor : public <a href="qcanvasview.html">QCanvasView</a> {
60 <a href="metaobjects.html#Q_OBJECT">Q_OBJECT</a>
61
62public:
63 FigureEditor(QCanvas&amp;, QWidget* parent=0, const char* name=0, WFlags f=0);
64 void clear();
65
66protected:
67 void contentsMousePressEvent(QMouseEvent*);
68 void contentsMouseMoveEvent(QMouseEvent*);
69
70signals:
71 void status(const <a href="qstring.html">QString</a>&amp;);
72
73private:
74 <a href="qcanvasitem.html">QCanvasItem</a>* moving;
75 <a href="qpoint.html">QPoint</a> moving_start;
76};
77
78class Main : public <a href="qmainwindow.html">QMainWindow</a> {
79 Q_OBJECT
80
81public:
82 Main(QCanvas&amp;, QWidget* parent=0, const char* name=0, WFlags f=0);
83 ~Main();
84
85public slots:
86 void help();
87
88private slots:
89 void aboutQt();
90 void newView();
91 void clear();
92 void init();
93
94 void addSprite();
95 void addCircle();
96 void addHexagon();
97 void addPolygon();
98 void addSpline();
99 void addText();
100 void addLine();
101 void addRectangle();
102 void addMesh();
103 void addLogo();
104 void addButterfly();
105
106 void enlarge();
107 void shrink();
108 void rotateClockwise();
109 void rotateCounterClockwise();
110 void zoomIn();
111 void zoomOut();
112 void mirror();
113 void moveL();
114 void moveR();
115 void moveU();
116 void moveD();
117
118 void print();
119
120 void toggleDoubleBuffer();
121
122private:
123 <a href="qcanvas.html">QCanvas</a>&amp; canvas;
124 FigureEditor *editor;
125
126 <a href="qpopupmenu.html">QPopupMenu</a>* options;
127 <a href="qprinter.html">QPrinter</a>* printer;
128 int dbf_id;
129};
130
131#endif
132</pre>
133
134<p> <hr>
135<p> Implementation:
136<p> <pre>#include &lt;<a href="qdatetime-h.html">qdatetime.h</a>&gt;
137#include &lt;<a href="qmainwindow-h.html">qmainwindow.h</a>&gt;
138#include &lt;<a href="qstatusbar-h.html">qstatusbar.h</a>&gt;
139#include &lt;<a href="qmessagebox-h.html">qmessagebox.h</a>&gt;
140#include &lt;<a href="qmenubar-h.html">qmenubar.h</a>&gt;
141#include &lt;<a href="qapplication-h.html">qapplication.h</a>&gt;
142#include &lt;<a href="qpainter-h.html">qpainter.h</a>&gt;
143#include &lt;<a href="qprinter-h.html">qprinter.h</a>&gt;
144#include &lt;<a href="qlabel-h.html">qlabel.h</a>&gt;
145#include &lt;<a href="qimage-h.html">qimage.h</a>&gt;
146#include &lt;<a href="qprogressdialog-h.html">qprogressdialog.h</a>&gt;
147#include "canvas.h"
148
149#include &lt;stdlib.h&gt;
150
151// We use a global variable to save memory - all the brushes and pens in
152// the mesh are shared.
153static QBrush *tb = 0;
154static QPen *tp = 0;
155
156class EdgeItem;
157class NodeItem;
158
159class EdgeItem: public <a href="qcanvasline.html">QCanvasLine</a>
160{
161public:
162 EdgeItem( NodeItem*, NodeItem*, QCanvas *canvas );
163 void setFromPoint( int x, int y ) ;
164 void setToPoint( int x, int y );
165 static int count() { return c; }
166 void moveBy(double dx, double dy);
167private:
168 static int c;
169};
170
171static const int imageRTTI = 984376;
172
173
174class ImageItem: public <a href="qcanvasrectangle.html">QCanvasRectangle</a>
175{
176public:
177 ImageItem( <a href="qimage.html">QImage</a> img, QCanvas *canvas );
178 int rtti () const { return imageRTTI; }
179 bool hit( const <a href="qpoint.html">QPoint</a>&amp;) const;
180protected:
181 void drawShape( <a href="qpainter.html">QPainter</a> &amp; );
182private:
183 <a href="qimage.html">QImage</a> image;
184 <a href="qpixmap.html">QPixmap</a> pixmap;
185};
186
187
188<a name="f623"></a>ImageItem::ImageItem( <a href="qimage.html">QImage</a> img, QCanvas *canvas )
189 : <a href="qcanvasrectangle.html">QCanvasRectangle</a>( canvas ), image(img)
190{
191<a name="x2935"></a><a name="x2932"></a> <a href="qcanvasrectangle.html#setSize">setSize</a>( image.<a href="qimage.html#width">width</a>(), image.<a href="qimage.html#height">height</a>() );
192
193#if !defined(Q_WS_QWS)
194<a name="x2943"></a> pixmap.<a href="qpixmap.html#convertFromImage">convertFromImage</a>(image, OrderedAlphaDither);
195#endif
196}
197
198
199<a name="x2925"></a>void ImageItem::<a href="qcanvasrectangle.html#drawShape">drawShape</a>( <a href="qpainter.html">QPainter</a> &amp;p )
200{
201// On Qt/Embedded, we can paint a QImage as fast as a QPixmap,
202// but on other platforms, we need to use a QPixmap.
203#if defined(Q_WS_QWS)
204<a name="x2941"></a> p.<a href="qpainter.html#drawImage">drawImage</a>( int(<a href="qcanvasitem.html#x">x</a>()), int(<a href="qcanvasitem.html#y">y</a>()), image, 0, 0, -1, -1, OrderedAlphaDither );
205#else
206 p.<a href="qpainter.html#drawPixmap">drawPixmap</a>( int(<a href="qcanvasitem.html#x">x</a>()), int(<a href="qcanvasitem.html#y">y</a>()), pixmap );
207#endif
208}
209
210bool <a name="f624"></a>ImageItem::hit( const <a href="qpoint.html">QPoint</a> &amp;p ) const
211{
212<a name="x2944"></a> int ix = p.<a href="qpoint.html#x">x</a>()-int(<a href="qcanvasitem.html#x">x</a>());
213<a name="x2945"></a> int iy = p.<a href="qpoint.html#y">y</a>()-int(<a href="qcanvasitem.html#y">y</a>());
214<a name="x2934"></a> if ( !image.<a href="qimage.html#valid">valid</a>( ix , iy ) )
215 return FALSE;
216<a name="x2933"></a> QRgb pixel = image.<a href="qimage.html#pixel">pixel</a>( ix, iy );
217 return qAlpha( pixel ) != 0;
218}
219
220class NodeItem: public <a href="qcanvasellipse.html">QCanvasEllipse</a>
221{
222public:
223 NodeItem( <a href="qcanvas.html">QCanvas</a> *canvas );
224 ~NodeItem() {}
225
226 void addInEdge( EdgeItem *edge ) { inList.<a href="qptrlist.html#append">append</a>( edge ); }
227 void addOutEdge( EdgeItem *edge ) { outList.<a href="qptrlist.html#append">append</a>( edge ); }
228
229 void moveBy(double dx, double dy);
230
231 // QPoint center() { return boundingRect().center(); }
232private:
233 <a href="qptrlist.html">QPtrList</a>&lt;EdgeItem&gt; inList;
234 <a href="qptrlist.html">QPtrList</a>&lt;EdgeItem&gt; outList;
235};
236
237
238int EdgeItem::c = 0;
239
240
241<a name="x2916"></a>void EdgeItem::<a href="qcanvasitem.html#moveBy">moveBy</a>(double, double)
242{
243 //nothing
244}
245
246<a name="f618"></a>EdgeItem::EdgeItem( NodeItem *from, NodeItem *to, QCanvas *canvas )
247 : <a href="qcanvasline.html">QCanvasLine</a>( canvas )
248{
249 c++;
250 setPen( *tp );
251 setBrush( *tb );
252 from-&gt;addOutEdge( this );
253 to-&gt;addInEdge( this );
254<a name="x2921"></a><a name="x2920"></a> setPoints( int(from-&gt;<a href="qcanvasitem.html#x">x</a>()), int(from-&gt;<a href="qcanvasitem.html#y">y</a>()), int(to-&gt;x()), int(to-&gt;y()) );
255 setZ( 127 );
256}
257
258void <a name="f619"></a>EdgeItem::setFromPoint( int x, int y )
259{
260 setPoints( x,y, endPoint().x(), endPoint().y() );
261}
262
263void <a name="f620"></a>EdgeItem::setToPoint( int x, int y )
264{
265 setPoints( startPoint().x(), startPoint().y(), x, y );
266}
267
268
269
270void NodeItem::<a href="qcanvasitem.html#moveBy">moveBy</a>(double dx, double dy)
271{
272 QCanvasEllipse::<a href="qcanvasitem.html#moveBy">moveBy</a>( dx, dy );
273
274 <a href="qptrlistiterator.html">QPtrListIterator</a>&lt;EdgeItem&gt; it1( inList );
275 EdgeItem *edge;
276<a name="x2949"></a> while (( edge = it1.<a href="qptrlistiterator.html#current">current</a>() )) {
277 ++it1;
278 edge-&gt;setToPoint( int(<a href="qwidget.html#x">x</a>()), int(<a href="qcanvasitem.html#y">y</a>()) );
279 }
280 <a href="qptrlistiterator.html">QPtrListIterator</a>&lt;EdgeItem&gt; it2( outList );
281 while (( edge = it2.<a href="qptrlistiterator.html#current">current</a>() )) {
282 ++it2;
283 edge-&gt;setFromPoint( int(<a href="qcanvasitem.html#x">x</a>()), int(<a href="qcanvasitem.html#y">y</a>()) );
284 }
285}
286
287<a name="f655"></a>NodeItem::NodeItem( <a href="qcanvas.html">QCanvas</a> *canvas )
288 : <a href="qcanvasellipse.html">QCanvasEllipse</a>( 6, 6, canvas )
289{
290 setPen( *tp );
291 setBrush( *tb );
292 <a href="qcanvasitem.html#setZ">setZ</a>( 128 );
293}
294
295<a name="f621"></a>FigureEditor::FigureEditor(
296 <a href="qcanvas.html">QCanvas</a>&amp; c, QWidget* parent,
297 const char* name, WFlags f) :
298 <a href="qcanvasview.html">QCanvasView</a>(&amp;c,parent,name,f)
299{
300}
301
302<a name="x2951"></a>void FigureEditor::<a href="qscrollview.html#contentsMousePressEvent">contentsMousePressEvent</a>(QMouseEvent* e)
303{
304 <a href="qpoint.html">QPoint</a> p = inverseWorldMatrix().map(e-&gt;pos());
305 <a href="qcanvasitemlist.html">QCanvasItemList</a> l=<a href="qcanvasitem.html#canvas">canvas</a>()-&gt;collisions(p);
306<a name="x2953"></a><a name="x2952"></a> for (QCanvasItemList::Iterator it=l.<a href="qvaluelist.html#begin">begin</a>(); it!=l.<a href="qvaluelist.html#end">end</a>(); ++it) {
307 if ( (*it)-&gt;rtti() == imageRTTI ) {
308 ImageItem *item= (ImageItem*)(*it);
309 if ( !item-&gt;hit( p ) )
310 continue;
311 }
312 moving = *it;
313 moving_start = p;
314 return;
315 }
316 moving = 0;
317}
318
319void <a name="f622"></a>FigureEditor::clear()
320{
321 <a href="qcanvasitemlist.html">QCanvasItemList</a> list = <a href="qcanvasitem.html#canvas">canvas</a>()-&gt;allItems();
322 QCanvasItemList::Iterator it = list.<a href="qvaluelist.html#begin">begin</a>();
323 for (; it != list.<a href="qvaluelist.html#end">end</a>(); ++it) {
324 if ( *it )
325 delete *it;
326 }
327}
328
329<a name="x2950"></a>void FigureEditor::<a href="qscrollview.html#contentsMouseMoveEvent">contentsMouseMoveEvent</a>(QMouseEvent* e)
330{
331 if ( moving ) {
332 <a href="qpoint.html">QPoint</a> p = inverseWorldMatrix().map(e-&gt;pos());
333 moving-&gt;moveBy(p.<a href="qpoint.html#x">x</a>() - moving_start.x(),
334 p.<a href="qpoint.html#y">y</a>() - moving_start.y());
335 moving_start = p;
336 <a href="qcanvasitem.html#canvas">canvas</a>()-&gt;update();
337 }
338}
339
340
341
342<a name="f615"></a>BouncyLogo::BouncyLogo(QCanvas* canvas) :
343 <a href="qcanvassprite.html">QCanvasSprite</a>(0,canvas)
344{
345 static QCanvasPixmapArray logo("qt-trans.xpm");
346 <a href="qcanvassprite.html#setSequence">setSequence</a>(&amp;logo);
347 <a href="qcanvasitem.html#setAnimated">setAnimated</a>(TRUE);
348 initPos();
349}
350
351
352const int logo_rtti = 1234;
353
354<a name="x2928"></a>int BouncyLogo::<a href="qcanvassprite.html#rtti">rtti</a>() const
355{
356 return logo_rtti;
357}
358
359void <a name="f616"></a>BouncyLogo::initPos()
360{
361 initSpeed();
362 int trial=1000;
363 do {
364 <a href="qcanvassprite.html#move">move</a>(rand()%canvas()-&gt;width(),rand()%canvas()-&gt;height());
365 advance(0);
366 } while (trial-- &amp;&amp; xVelocity()==0.0 &amp;&amp; yVelocity()==0.0);
367}
368
369void <a name="f617"></a>BouncyLogo::initSpeed()
370{
371 const double speed = 4.0;
372 double d = (double)(rand()%1024) / 1024.0;
373 setVelocity( d*speed*2-speed, (1-d)*speed*2-speed );
374}
375
376<a name="x2927"></a>void BouncyLogo::<a href="qcanvassprite.html#advance">advance</a>(int stage)
377{
378 switch ( stage ) {
379 case 0: {
380 double vx = xVelocity();
381 double vy = yVelocity();
382
383 if ( vx == 0.0 &amp;&amp; vy == 0.0 ) {
384 // stopped last turn
385 initSpeed();
386 vx = xVelocity();
387 vy = yVelocity();
388 }
389
390 double nx = <a href="qwidget.html#x">x</a>() + vx;
391 double ny = <a href="qwidget.html#y">y</a>() + vy;
392
393 if ( nx &lt; 0 || nx &gt;= canvas()-&gt;width() )
394 vx = -vx;
395 if ( ny &lt; 0 || ny &gt;= canvas()-&gt;height() )
396 vy = -vy;
397
398 for (int bounce=0; bounce&lt;4; bounce++) {
399 <a href="qcanvasitemlist.html">QCanvasItemList</a> l=collisions(FALSE);
400 for (QCanvasItemList::Iterator it=l.<a href="qvaluelist.html#begin">begin</a>(); it!=l.<a href="qvaluelist.html#end">end</a>(); ++it) {
401 <a href="qcanvasitem.html">QCanvasItem</a> *hit = *it;
402<a name="x2917"></a><a name="x2914"></a> if ( hit-&gt;<a href="qcanvasitem.html#rtti">rtti</a>()==logo_rtti &amp;&amp; hit-&gt;<a href="qcanvasitem.html#collidesWith">collidesWith</a>(this) ) {
403 switch ( bounce ) {
404 case 0:
405 vx = -vx;
406 break;
407 case 1:
408 vy = -vy;
409 vx = -vx;
410 break;
411 case 2:
412 vx = -vx;
413 break;
414 case 3:
415 // Stop for this turn
416 vx = 0;
417 vy = 0;
418 break;
419 }
420 setVelocity(vx,vy);
421 break;
422 }
423 }
424 }
425
426 if ( <a href="qwidget.html#x">x</a>()+vx &lt; 0 || x()+vx &gt;= canvas()-&gt;width() )
427 vx = 0;
428 if ( <a href="qwidget.html#y">y</a>()+vy &lt; 0 || y()+vy &gt;= canvas()-&gt;height() )
429 vy = 0;
430
431 setVelocity(vx,vy);
432 } break;
433 case 1:
434<a name="x2913"></a> <a href="qcanvasitem.html">QCanvasItem</a>::<a href="qcanvasitem.html#advance">advance</a>(stage);
435 break;
436 }
437}
438
439static uint mainCount = 0;
440static QImage *butterflyimg;
441static QImage *logoimg;
442
443<a name="f625"></a>Main::Main(QCanvas&amp; c, QWidget* parent, const char* name, WFlags f) :
444 <a href="qmainwindow.html">QMainWindow</a>(parent,name,f),
445 canvas(c)
446{
447 editor = new FigureEditor(canvas,this);
448 <a href="qmenubar.html">QMenuBar</a>* menu = <a href="qmainwindow.html#menuBar">menuBar</a>();
449
450 <a href="qpopupmenu.html">QPopupMenu</a>* file = new <a href="qpopupmenu.html">QPopupMenu</a>( menu );
451<a name="x2936"></a> file-&gt;<a href="qmenudata.html#insertItem">insertItem</a>("&amp;Fill canvas", this, SLOT(init()), CTRL+Key_F);
452 file-&gt;<a href="qmenudata.html#insertItem">insertItem</a>("&amp;Erase canvas", this, SLOT(clear()), CTRL+Key_E);
453 file-&gt;<a href="qmenudata.html#insertItem">insertItem</a>("&amp;New view", this, SLOT(newView()), CTRL+Key_N);
454 file-&gt;<a href="qmenudata.html#insertSeparator">insertSeparator</a>();
455 file-&gt;<a href="qmenudata.html#insertItem">insertItem</a>("&amp;Print...", this, SLOT(print()), CTRL+Key_P);
456 file-&gt;<a href="qmenudata.html#insertSeparator">insertSeparator</a>();
457 file-&gt;<a href="qmenudata.html#insertItem">insertItem</a>("E&amp;xit", qApp, SLOT(<a href="qapplication.html#quit">quit</a>()), CTRL+Key_Q);
458 menu-&gt;<a href="qmenudata.html#insertItem">insertItem</a>("&amp;File", file);
459
460 <a href="qpopupmenu.html">QPopupMenu</a>* edit = new <a href="qpopupmenu.html">QPopupMenu</a>( menu );
461 edit-&gt;<a href="qmenudata.html#insertItem">insertItem</a>("Add &amp;Circle", this, SLOT(addCircle()), ALT+Key_C);
462 edit-&gt;<a href="qmenudata.html#insertItem">insertItem</a>("Add &amp;Hexagon", this, SLOT(addHexagon()), ALT+Key_H);
463 edit-&gt;<a href="qmenudata.html#insertItem">insertItem</a>("Add &amp;Polygon", this, SLOT(addPolygon()), ALT+Key_P);
464 edit-&gt;<a href="qmenudata.html#insertItem">insertItem</a>("Add Spl&amp;ine", this, SLOT(addSpline()), ALT+Key_I);
465 edit-&gt;<a href="qmenudata.html#insertItem">insertItem</a>("Add &amp;Text", this, SLOT(addText()), ALT+Key_T);
466 edit-&gt;<a href="qmenudata.html#insertItem">insertItem</a>("Add &amp;Line", this, SLOT(addLine()), ALT+Key_L);
467 edit-&gt;<a href="qmenudata.html#insertItem">insertItem</a>("Add &amp;Rectangle", this, SLOT(addRectangle()), ALT+Key_R);
468 edit-&gt;<a href="qmenudata.html#insertItem">insertItem</a>("Add &amp;Sprite", this, SLOT(addSprite()), ALT+Key_S);
469 edit-&gt;<a href="qmenudata.html#insertItem">insertItem</a>("Create &amp;Mesh", this, SLOT(addMesh()), ALT+Key_M );
470 edit-&gt;<a href="qmenudata.html#insertItem">insertItem</a>("Add &amp;Alpha-blended image", this, SLOT(addButterfly()), ALT+Key_A);
471 menu-&gt;<a href="qmenudata.html#insertItem">insertItem</a>("&amp;Edit", edit);
472
473 <a href="qpopupmenu.html">QPopupMenu</a>* view = new <a href="qpopupmenu.html">QPopupMenu</a>( menu );
474 view-&gt;<a href="qmenudata.html#insertItem">insertItem</a>("&amp;Enlarge", this, SLOT(enlarge()), SHIFT+CTRL+Key_Plus);
475 view-&gt;<a href="qmenudata.html#insertItem">insertItem</a>("Shr&amp;ink", this, SLOT(shrink()), SHIFT+CTRL+Key_Minus);
476 view-&gt;<a href="qmenudata.html#insertSeparator">insertSeparator</a>();
477 view-&gt;<a href="qmenudata.html#insertItem">insertItem</a>("&amp;Rotate clockwise", this, SLOT(rotateClockwise()), CTRL+Key_PageDown);
478 view-&gt;<a href="qmenudata.html#insertItem">insertItem</a>("Rotate &amp;counterclockwise", this, SLOT(rotateCounterClockwise()), CTRL+Key_PageUp);
479 view-&gt;<a href="qmenudata.html#insertItem">insertItem</a>("&amp;Zoom in", this, SLOT(zoomIn()), CTRL+Key_Plus);
480 view-&gt;<a href="qmenudata.html#insertItem">insertItem</a>("Zoom &amp;out", this, SLOT(zoomOut()), CTRL+Key_Minus);
481 view-&gt;<a href="qmenudata.html#insertItem">insertItem</a>("Translate left", this, SLOT(moveL()), CTRL+Key_Left);
482 view-&gt;<a href="qmenudata.html#insertItem">insertItem</a>("Translate right", this, SLOT(moveR()), CTRL+Key_Right);
483 view-&gt;<a href="qmenudata.html#insertItem">insertItem</a>("Translate up", this, SLOT(moveU()), CTRL+Key_Up);
484 view-&gt;<a href="qmenudata.html#insertItem">insertItem</a>("Translate down", this, SLOT(moveD()), CTRL+Key_Down);
485 view-&gt;<a href="qmenudata.html#insertItem">insertItem</a>("&amp;Mirror", this, SLOT(mirror()), CTRL+Key_Home);
486 menu-&gt;<a href="qmenudata.html#insertItem">insertItem</a>("&amp;View", view);
487
488 options = new <a href="qpopupmenu.html">QPopupMenu</a>( menu );
489 dbf_id = options-&gt;<a href="qmenudata.html#insertItem">insertItem</a>("Double buffer", this, SLOT(toggleDoubleBuffer()));
490<a name="x2939"></a> options-&gt;<a href="qmenudata.html#setItemChecked">setItemChecked</a>(dbf_id, TRUE);
491 menu-&gt;<a href="qmenudata.html#insertItem">insertItem</a>("&amp;Options",options);
492
493 menu-&gt;<a href="qmenudata.html#insertSeparator">insertSeparator</a>();
494
495 <a href="qpopupmenu.html">QPopupMenu</a>* help = new <a href="qpopupmenu.html">QPopupMenu</a>( menu );
496 help-&gt;<a href="qmenudata.html#insertItem">insertItem</a>("&amp;About", this, SLOT(help()), Key_F1);
497 help-&gt;<a href="qmenudata.html#setItemChecked">setItemChecked</a>(dbf_id, TRUE);
498 menu-&gt;<a href="qmenudata.html#insertItem">insertItem</a>("&amp;Help",help);
499
500 <a href="qmainwindow.html#statusBar">statusBar</a>();
501
502 <a href="qmainwindow.html#setCentralWidget">setCentralWidget</a>(editor);
503
504 printer = 0;
505
506 init();
507}
508
509void <a name="f626"></a>Main::init()
510{
511 clear();
512
513 static int r=24;
514 srand(++r);
515
516 mainCount++;
517 butterflyimg = 0;
518 logoimg = 0;
519
520 int i;
521<a name="x2912"></a> for ( i=0; i&lt;canvas.<a href="qcanvas.html#width">width</a>() / 56; i++) {
522 addButterfly();
523 }
524 for ( i=0; i&lt;canvas.<a href="qcanvas.html#width">width</a>() / 85; i++) {
525 addHexagon();
526 }
527 for ( i=0; i&lt;canvas.<a href="qcanvas.html#width">width</a>() / 128; i++) {
528 addLogo();
529 }
530}
531
532Main::~Main()
533{
534 delete printer;
535 if ( !--mainCount ) {
536 delete[] butterflyimg;
537 butterflyimg = 0;
538 delete[] logoimg;
539 logoimg = 0;
540 }
541}
542
543void <a name="f627"></a>Main::newView()
544{
545 // Open a new view... have it delete when closed.
546 Main *m = new Main(canvas, 0, 0, WDestructiveClose);
547 qApp-&gt;<a href="qapplication.html#setMainWidget">setMainWidget</a>(m);
548 m-&gt;<a href="qwidget.html#show">show</a>();
549 qApp-&gt;<a href="qapplication.html#setMainWidget">setMainWidget</a>(0);
550}
551
552void <a name="f628"></a>Main::clear()
553{
554 editor-&gt;clear();
555}
556
557void <a name="f629"></a>Main::help()
558{
559 static QMessageBox* about = new <a href="qmessagebox.html">QMessageBox</a>( "Qt Canvas Example",
560 "&lt;h3&gt;The QCanvas classes example&lt;/h3&gt;"
561 "&lt;ul&gt;"
562 "&lt;li&gt; Press ALT-S for some sprites."
563 "&lt;li&gt; Press ALT-C for some circles."
564 "&lt;li&gt; Press ALT-L for some lines."
565 "&lt;li&gt; Drag the objects around."
566 "&lt;li&gt; Read the code!"
567 "&lt;/ul&gt;", QMessageBox::Information, 1, 0, 0, this, 0, FALSE );
568 about-&gt;setButtonText( 1, "Dismiss" );
569 about-&gt;show();
570}
571
572void <a name="f630"></a>Main::aboutQt()
573{
574 QMessageBox::<a href="qmessagebox.html#aboutQt">aboutQt</a>( this, "Qt Canvas Example" );
575}
576
577void <a name="f631"></a>Main::toggleDoubleBuffer()
578{
579<a name="x2938"></a> bool s = !options-&gt;<a href="qmenudata.html#isItemChecked">isItemChecked</a>(dbf_id);
580 options-&gt;<a href="qmenudata.html#setItemChecked">setItemChecked</a>(dbf_id,s);
581<a name="x2911"></a> canvas.<a href="qcanvas.html#setDoubleBuffering">setDoubleBuffering</a>(s);
582}
583
584void <a name="f632"></a>Main::enlarge()
585{
586<a name="x2910"></a><a name="x2909"></a> canvas.<a href="qcanvas.html#resize">resize</a>(canvas.<a href="qcanvas.html#width">width</a>()*4/3, canvas.<a href="qcanvas.html#height">height</a>()*4/3);
587}
588
589void <a name="f633"></a>Main::shrink()
590{
591 canvas.<a href="qcanvas.html#resize">resize</a>(canvas.<a href="qcanvas.html#width">width</a>()*3/4, canvas.<a href="qcanvas.html#height">height</a>()*3/4);
592}
593
594void <a name="f634"></a>Main::rotateClockwise()
595{
596<a name="x2931"></a> <a href="qwmatrix.html">QWMatrix</a> m = editor-&gt;<a href="qcanvasview.html#worldMatrix">worldMatrix</a>();
597<a name="x2955"></a> m.<a href="qwmatrix.html#rotate">rotate</a>( 22.5 );
598<a name="x2930"></a> editor-&gt;<a href="qcanvasview.html#setWorldMatrix">setWorldMatrix</a>( m );
599}
600
601void <a name="f635"></a>Main::rotateCounterClockwise()
602{
603 <a href="qwmatrix.html">QWMatrix</a> m = editor-&gt;<a href="qcanvasview.html#worldMatrix">worldMatrix</a>();
604 m.<a href="qwmatrix.html#rotate">rotate</a>( -22.5 );
605 editor-&gt;<a href="qcanvasview.html#setWorldMatrix">setWorldMatrix</a>( m );
606}
607
608void <a name="f636"></a>Main::zoomIn()
609{
610 <a href="qwmatrix.html">QWMatrix</a> m = editor-&gt;<a href="qcanvasview.html#worldMatrix">worldMatrix</a>();
611<a name="x2956"></a> m.<a href="qwmatrix.html#scale">scale</a>( 2.0, 2.0 );
612 editor-&gt;<a href="qcanvasview.html#setWorldMatrix">setWorldMatrix</a>( m );
613}
614
615void <a name="f637"></a>Main::zoomOut()
616{
617 <a href="qwmatrix.html">QWMatrix</a> m = editor-&gt;<a href="qcanvasview.html#worldMatrix">worldMatrix</a>();
618 m.<a href="qwmatrix.html#scale">scale</a>( 0.5, 0.5 );
619 editor-&gt;<a href="qcanvasview.html#setWorldMatrix">setWorldMatrix</a>( m );
620}
621
622void <a name="f638"></a>Main::mirror()
623{
624 <a href="qwmatrix.html">QWMatrix</a> m = editor-&gt;<a href="qcanvasview.html#worldMatrix">worldMatrix</a>();
625 m.<a href="qwmatrix.html#scale">scale</a>( -1, 1 );
626 editor-&gt;<a href="qcanvasview.html#setWorldMatrix">setWorldMatrix</a>( m );
627}
628
629void <a name="f639"></a>Main::moveL()
630{
631 <a href="qwmatrix.html">QWMatrix</a> m = editor-&gt;<a href="qcanvasview.html#worldMatrix">worldMatrix</a>();
632<a name="x2957"></a> m.<a href="qwmatrix.html#translate">translate</a>( -16, 0 );
633 editor-&gt;<a href="qcanvasview.html#setWorldMatrix">setWorldMatrix</a>( m );
634}
635
636void <a name="f640"></a>Main::moveR()
637{
638 <a href="qwmatrix.html">QWMatrix</a> m = editor-&gt;<a href="qcanvasview.html#worldMatrix">worldMatrix</a>();
639 m.<a href="qwmatrix.html#translate">translate</a>( +16, 0 );
640 editor-&gt;<a href="qcanvasview.html#setWorldMatrix">setWorldMatrix</a>( m );
641}
642
643void <a name="f641"></a>Main::moveU()
644{
645 <a href="qwmatrix.html">QWMatrix</a> m = editor-&gt;<a href="qcanvasview.html#worldMatrix">worldMatrix</a>();
646 m.<a href="qwmatrix.html#translate">translate</a>( 0, -16 );
647 editor-&gt;<a href="qcanvasview.html#setWorldMatrix">setWorldMatrix</a>( m );
648}
649
650void <a name="f642"></a>Main::moveD()
651{
652 <a href="qwmatrix.html">QWMatrix</a> m = editor-&gt;<a href="qcanvasview.html#worldMatrix">worldMatrix</a>();
653 m.<a href="qwmatrix.html#translate">translate</a>( 0, +16 );
654 editor-&gt;<a href="qcanvasview.html#setWorldMatrix">setWorldMatrix</a>( m );
655}
656
657void <a name="f643"></a>Main::print()
658{
659 if ( !printer ) printer = new <a href="qprinter.html">QPrinter</a>;
660 if ( printer-&gt;setup(this) ) {
661 <a href="qpainter.html">QPainter</a> pp(printer);
662<a name="x2908"></a> canvas.<a href="qcanvas.html#drawArea">drawArea</a>(QRect(0,0,canvas.<a href="qcanvas.html#width">width</a>(),canvas.<a href="qcanvas.html#height">height</a>()),&amp;pp,FALSE);
663 }
664}
665
666
667void <a name="f644"></a>Main::addSprite()
668{
669 <a href="qcanvasitem.html">QCanvasItem</a>* i = new BouncyLogo(&amp;canvas);
670<a name="x2918"></a> i-&gt;<a href="qcanvasitem.html#setZ">setZ</a>(rand()%256);
671<a name="x2919"></a> i-&gt;<a href="qcanvasitem.html#show">show</a>();
672}
673
674QString butterfly_fn;
675QString logo_fn;
676
677
678void <a name="f645"></a>Main::addButterfly()
679{
680 if ( butterfly_fn.isEmpty() )
681 return;
682 if ( !butterflyimg ) {
683 butterflyimg = new <a href="qimage.html">QImage</a>[4];
684 butterflyimg[0].load( butterfly_fn );
685 butterflyimg[1] = butterflyimg[0].smoothScale( int(butterflyimg[0].width()*0.75),
686 int(butterflyimg[0].height()*0.75) );
687 butterflyimg[2] = butterflyimg[0].smoothScale( int(butterflyimg[0].width()*0.5),
688 int(butterflyimg[0].height()*0.5) );
689 butterflyimg[3] = butterflyimg[0].smoothScale( int(butterflyimg[0].width()*0.25),
690 int(butterflyimg[0].height()*0.25) );
691 }
692 <a href="qcanvaspolygonalitem.html">QCanvasPolygonalItem</a>* i = new ImageItem(butterflyimg[rand()%4],&amp;canvas);
693<a name="x2915"></a> i-&gt;<a href="qcanvasitem.html#move">move</a>(rand()%(canvas.<a href="qcanvas.html#width">width</a>()-butterflyimg-&gt;<a href="qimage.html#width">width</a>()),
694 rand()%(canvas.<a href="qcanvas.html#height">height</a>()-butterflyimg-&gt;<a href="qimage.html#height">height</a>()));
695 i-&gt;<a href="qcanvasitem.html#setZ">setZ</a>(rand()%256+250);
696 i-&gt;<a href="qcanvasitem.html#show">show</a>();
697}
698
699void <a name="f646"></a>Main::addLogo()
700{
701 if ( logo_fn.isEmpty() )
702 return;
703 if ( !logoimg ) {
704 logoimg = new <a href="qimage.html">QImage</a>[4];
705 logoimg[0].load( logo_fn );
706 logoimg[1] = logoimg[0].smoothScale( int(logoimg[0].width()*0.75),
707 int(logoimg[0].height()*0.75) );
708 logoimg[2] = logoimg[0].smoothScale( int(logoimg[0].width()*0.5),
709 int(logoimg[0].height()*0.5) );
710 logoimg[3] = logoimg[0].smoothScale( int(logoimg[0].width()*0.25),
711 int(logoimg[0].height()*0.25) );
712 }
713 <a href="qcanvaspolygonalitem.html">QCanvasPolygonalItem</a>* i = new ImageItem(logoimg[rand()%4],&amp;canvas);
714 i-&gt;<a href="qcanvasitem.html#move">move</a>(rand()%(canvas.<a href="qcanvas.html#width">width</a>()-logoimg-&gt;<a href="qimage.html#width">width</a>()),
715 rand()%(canvas.<a href="qcanvas.html#height">height</a>()-logoimg-&gt;<a href="qimage.html#width">width</a>()));
716 i-&gt;<a href="qcanvasitem.html#setZ">setZ</a>(rand()%256+256);
717 i-&gt;<a href="qcanvasitem.html#show">show</a>();
718}
719
720
721
722void <a name="f647"></a>Main::addCircle()
723{
724 <a href="qcanvaspolygonalitem.html">QCanvasPolygonalItem</a>* i = new <a href="qcanvasellipse.html">QCanvasEllipse</a>(50,50,&amp;canvas);
725<a name="x2923"></a> i-&gt;<a href="qcanvaspolygonalitem.html#setBrush">setBrush</a>( QColor(rand()%32*8,rand()%32*8,rand()%32*8) );
726 i-&gt;<a href="qcanvasitem.html#move">move</a>(rand()%canvas.<a href="qcanvas.html#width">width</a>(),rand()%canvas.<a href="qcanvas.html#height">height</a>());
727 i-&gt;<a href="qcanvasitem.html#setZ">setZ</a>(rand()%256);
728 i-&gt;<a href="qcanvasitem.html#show">show</a>();
729}
730
731void <a name="f648"></a>Main::addHexagon()
732{
733 <a href="qcanvaspolygon.html">QCanvasPolygon</a>* i = new <a href="qcanvaspolygon.html">QCanvasPolygon</a>(&amp;canvas);
734 const int size = canvas.<a href="qcanvas.html#width">width</a>() / 25;
735 <a href="qpointarray.html">QPointArray</a> pa(6);
736 pa[0] = QPoint(2*size,0);
737 pa[1] = QPoint(size,-size*173/100);
738 pa[2] = QPoint(-size,-size*173/100);
739 pa[3] = QPoint(-2*size,0);
740 pa[4] = QPoint(-size,size*173/100);
741 pa[5] = QPoint(size,size*173/100);
742<a name="x2922"></a> i-&gt;<a href="qcanvasline.html#setPoints">setPoints</a>(pa);
743 i-&gt;<a href="qcanvaspolygonalitem.html#setBrush">setBrush</a>( QColor(rand()%32*8,rand()%32*8,rand()%32*8) );
744 i-&gt;<a href="qcanvasitem.html#move">move</a>(rand()%canvas.<a href="qcanvas.html#width">width</a>(),rand()%canvas.<a href="qcanvas.html#height">height</a>());
745 i-&gt;<a href="qcanvasitem.html#setZ">setZ</a>(rand()%256);
746 i-&gt;<a href="qcanvasitem.html#show">show</a>();
747}
748
749void <a name="f649"></a>Main::addPolygon()
750{
751 <a href="qcanvaspolygon.html">QCanvasPolygon</a>* i = new <a href="qcanvaspolygon.html">QCanvasPolygon</a>(&amp;canvas);
752 const int size = canvas.<a href="qcanvas.html#width">width</a>()/2;
753 <a href="qpointarray.html">QPointArray</a> pa(6);
754 pa[0] = QPoint(0,0);
755 pa[1] = QPoint(size,size/5);
756 pa[2] = QPoint(size*4/5,size);
757 pa[3] = QPoint(size/6,size*5/4);
758 pa[4] = QPoint(size*3/4,size*3/4);
759 pa[5] = QPoint(size*3/4,size/4);
760 i-&gt;<a href="qcanvasline.html#setPoints">setPoints</a>(pa);
761 i-&gt;<a href="qcanvaspolygonalitem.html#setBrush">setBrush</a>( QColor(rand()%32*8,rand()%32*8,rand()%32*8) );
762 i-&gt;<a href="qcanvasitem.html#move">move</a>(rand()%canvas.<a href="qcanvas.html#width">width</a>(),rand()%canvas.<a href="qcanvas.html#height">height</a>());
763 i-&gt;<a href="qcanvasitem.html#setZ">setZ</a>(rand()%256);
764 i-&gt;<a href="qcanvasitem.html#show">show</a>();
765}
766
767void <a name="f650"></a>Main::addSpline()
768{
769 <a href="qcanvasspline.html">QCanvasSpline</a>* i = new <a href="qcanvasspline.html">QCanvasSpline</a>(&amp;canvas);
770 const int size = canvas.<a href="qcanvas.html#width">width</a>()/6;
771 <a href="qpointarray.html">QPointArray</a> pa(12);
772 pa[0] = QPoint(0,0);
773 pa[1] = QPoint(size/2,0);
774 pa[2] = QPoint(size,size/2);
775 pa[3] = QPoint(size,size);
776 pa[4] = QPoint(size,size*3/2);
777 pa[5] = QPoint(size/2,size*2);
778 pa[6] = QPoint(0,size*2);
779 pa[7] = QPoint(-size/2,size*2);
780 pa[8] = QPoint(size/4,size*3/2);
781 pa[9] = QPoint(0,size);
782 pa[10]= QPoint(-size/4,size/2);
783 pa[11]= QPoint(-size/2,0);
784<a name="x2926"></a> i-&gt;<a href="qcanvasspline.html#setControlPoints">setControlPoints</a>(pa);
785 i-&gt;<a href="qcanvaspolygonalitem.html#setBrush">setBrush</a>( QColor(rand()%32*8,rand()%32*8,rand()%32*8) );
786 i-&gt;<a href="qcanvasitem.html#move">move</a>(rand()%canvas.<a href="qcanvas.html#width">width</a>(),rand()%canvas.<a href="qcanvas.html#height">height</a>());
787 i-&gt;<a href="qcanvasitem.html#setZ">setZ</a>(rand()%256);
788 i-&gt;<a href="qcanvasitem.html#show">show</a>();
789}
790
791void <a name="f651"></a>Main::addText()
792{
793 <a href="qcanvastext.html">QCanvasText</a>* i = new <a href="qcanvastext.html">QCanvasText</a>(&amp;canvas);
794<a name="x2929"></a> i-&gt;<a href="qcanvastext.html#setText">setText</a>("QCanvasText");
795 i-&gt;<a href="qcanvasitem.html#move">move</a>(rand()%canvas.<a href="qcanvas.html#width">width</a>(),rand()%canvas.<a href="qcanvas.html#height">height</a>());
796 i-&gt;<a href="qcanvasitem.html#setZ">setZ</a>(rand()%256);
797 i-&gt;<a href="qcanvasitem.html#show">show</a>();
798}
799
800void <a name="f652"></a>Main::addLine()
801{
802 <a href="qcanvasline.html">QCanvasLine</a>* i = new <a href="qcanvasline.html">QCanvasLine</a>(&amp;canvas);
803 i-&gt;<a href="qcanvasline.html#setPoints">setPoints</a>( rand()%canvas.<a href="qcanvas.html#width">width</a>(), rand()%canvas.<a href="qcanvas.html#height">height</a>(),
804 rand()%canvas.<a href="qcanvas.html#width">width</a>(), rand()%canvas.<a href="qcanvas.html#height">height</a>() );
805<a name="x2924"></a> i-&gt;<a href="qcanvaspolygonalitem.html#setPen">setPen</a>( QPen(QColor(rand()%32*8,rand()%32*8,rand()%32*8), 6) );
806 i-&gt;<a href="qcanvasitem.html#setZ">setZ</a>(rand()%256);
807 i-&gt;<a href="qcanvasitem.html#show">show</a>();
808}
809
810void <a name="f653"></a>Main::addMesh()
811{
812 int x0 = 0;
813 int y0 = 0;
814
815 if ( !tb ) tb = new <a href="qbrush.html">QBrush</a>( Qt::red );
816 if ( !tp ) tp = new <a href="qpen.html">QPen</a>( Qt::black );
817
818 int nodecount = 0;
819
820 int w = canvas.<a href="qcanvas.html#width">width</a>();
821 int h = canvas.<a href="qcanvas.html#height">height</a>();
822
823 const int dist = 30;
824 int rows = h / dist;
825 int cols = w / dist;
826
827#ifndef QT_NO_PROGRESSDIALOG
828 <a href="qprogressdialog.html">QProgressDialog</a> progress( "Creating mesh...", "Abort", rows,
829 this, "progress", TRUE );
830#endif
831
832 <a href="qmemarray.html">QMemArray</a>&lt;NodeItem*&gt; lastRow(cols);
833 for ( int j = 0; j &lt; rows; j++ ) {
834 int n = j%2 ? cols-1 : cols;
835 NodeItem *prev = 0;
836 for ( int i = 0; i &lt; n; i++ ) {
837 NodeItem *el = new NodeItem( &amp;canvas );
838 nodecount++;
839 int r = rand();
840 int xrand = r %20;
841 int yrand = (r/20) %20;
842 el-&gt;<a href="qcanvasitem.html#move">move</a>( xrand + x0 + i*dist + (j%2 ? dist/2 : 0 ),
843 yrand + y0 + j*dist );
844
845 if ( j &gt; 0 ) {
846 if ( i &lt; cols-1 )
847 (new EdgeItem( lastRow[i], el, &amp;canvas ))-&gt;show();
848 if ( j%2 )
849 (new EdgeItem( lastRow[i+1], el, &amp;canvas ))-&gt;show();
850 else if ( i &gt; 0 )
851 (new EdgeItem( lastRow[i-1], el, &amp;canvas ))-&gt;show();
852 }
853 if ( prev ) {
854 (new EdgeItem( prev, el, &amp;canvas ))-&gt;show();
855 }
856 if ( i &gt; 0 ) lastRow[i-1] = prev;
857 prev = el;
858 el-&gt;<a href="qcanvasitem.html#show">show</a>();
859 }
860 lastRow[n-1]=prev;
861#ifndef QT_NO_PROGRESSDIALOG
862<a name="x2946"></a> progress.<a href="qprogressdialog.html#setProgress">setProgress</a>( j );
863<a name="x2947"></a> if ( progress.<a href="qprogressdialog.html#wasCancelled">wasCancelled</a>() )
864 break;
865#endif
866 }
867#ifndef QT_NO_PROGRESSDIALOG
868 progress.<a href="qprogressdialog.html#setProgress">setProgress</a>( rows );
869#endif
870 // qDebug( "%d nodes, %d edges", nodecount, EdgeItem::count() );
871}
872
873void <a name="f654"></a>Main::addRectangle()
874{
875 <a href="qcanvaspolygonalitem.html">QCanvasPolygonalItem</a> *i = new <a href="qcanvasrectangle.html">QCanvasRectangle</a>( rand()%canvas.<a href="qcanvas.html#width">width</a>(),rand()%canvas.<a href="qcanvas.html#height">height</a>(),
876 canvas.<a href="qcanvas.html#width">width</a>()/5,canvas.<a href="qcanvas.html#width">width</a>()/5,&amp;canvas);
877 int z = rand()%256;
878 i-&gt;<a href="qcanvaspolygonalitem.html#setBrush">setBrush</a>( QColor(z,z,z) );
879 i-&gt;<a href="qcanvaspolygonalitem.html#setPen">setPen</a>( QPen(QColor(rand()%32*8,rand()%32*8,rand()%32*8), 6) );
880 i-&gt;<a href="qcanvasitem.html#setZ">setZ</a>(z);
881 i-&gt;<a href="qcanvasitem.html#show">show</a>();
882}
883</pre>
884
885<p> <hr>
886<p> Main:
887<p> <pre>#include &lt;<a href="qstatusbar-h.html">qstatusbar.h</a>&gt;
888#include &lt;<a href="qmessagebox-h.html">qmessagebox.h</a>&gt;
889#include &lt;<a href="qmenubar-h.html">qmenubar.h</a>&gt;
890#include &lt;<a href="qapplication-h.html">qapplication.h</a>&gt;
891#include &lt;<a href="qimage-h.html">qimage.h</a>&gt;
892
893#include "canvas.h"
894
895#include &lt;stdlib.h&gt;
896
897extern QString butterfly_fn;
898extern QString logo_fn;
899
900int main(int argc, char** argv)
901{
902 <a href="qapplication.html">QApplication</a> app(argc,argv);
903
904 if ( argc &gt; 1 )
905 butterfly_fn = argv[1];
906 else
907 butterfly_fn = "butterfly.png";
908
909 if ( argc &gt; 2 )
910 logo_fn = argv[2];
911 else
912 logo_fn = "qtlogo.png";
913
914 <a href="qcanvas.html">QCanvas</a> canvas(800,600);
915<a name="x2962"></a> canvas.<a href="qcanvas.html#setAdvancePeriod">setAdvancePeriod</a>(30);
916 Main m(canvas);
917<a name="x2969"></a> m.<a href="qwidget.html#resize">resize</a>(m.<a href="qwidget.html#sizeHint">sizeHint</a>());
918 m.<a href="qwidget.html#setCaption">setCaption</a>("Qt Example - Canvas");
919<a name="x2970"></a><a name="x2958"></a> if ( QApplication::<a href="qapplication.html#desktop">desktop</a>()-&gt;width() &gt; m.<a href="qwidget.html#width">width</a>() + 10
920<a name="x2964"></a> &amp;&amp; QApplication::<a href="qapplication.html#desktop">desktop</a>()-&gt;height() &gt; m.<a href="qwidget.html#height">height</a>() +30 )
921 m.<a href="qwidget.html#show">show</a>();
922 else
923<a name="x2968"></a> m.<a href="qwidget.html#showMaximized">showMaximized</a>();
924
925 QObject::<a href="qobject.html#connect">connect</a>( qApp, SIGNAL(<a href="qapplication.html#lastWindowClosed">lastWindowClosed</a>()), qApp, SLOT(<a href="qapplication.html#quit">quit</a>()) );
926
927 return app.<a href="qapplication.html#exec">exec</a>();
928}
929
930</pre>
931
932<p>See also <a href="examples.html">Examples</a>.
933
934<!-- eof -->
935<p><address><hr><div align=center>
936<table width=100% cellspacing=0 border=0><tr>
937<td>Copyright &copy; 2007
938<a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a>
939<td align=right><div align=right>Qt 3.3.8</div>
940</table></div></address></body>
941</html>
Note: See TracBrowser for help on using the repository browser.