source: trunk/examples/graphicsview/portedcanvas/canvas.cpp@ 374

Last change on this file since 374 was 2, checked in by Dmitry A. Kuminov, 16 years ago

Initially imported qt-all-opensource-src-4.5.1 from Trolltech.
File size: 19.7 KB
Line 
1/****************************************************************************
2**
3** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
4** Contact: Qt Software Information ([email protected])
5**
6** This file is part of the examples of the Qt Toolkit.
7**
8** $QT_BEGIN_LICENSE:LGPL$
9** Commercial Usage
10** Licensees holding valid Qt Commercial licenses may use this file in
11** accordance with the Qt Commercial License Agreement provided with the
12** Software or, alternatively, in accordance with the terms contained in
13** a written agreement between you and Nokia.
14**
15** GNU Lesser General Public License Usage
16** Alternatively, this file may be used under the terms of the GNU Lesser
17** General Public License version 2.1 as published by the Free Software
18** Foundation and appearing in the file LICENSE.LGPL included in the
19** packaging of this file. Please review the following information to
20** ensure the GNU Lesser General Public License version 2.1 requirements
21** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
22**
23** In addition, as a special exception, Nokia gives you certain
24** additional rights. These rights are described in the Nokia Qt LGPL
25** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
26** package.
27**
28** GNU General Public License Usage
29** Alternatively, this file may be used under the terms of the GNU
30** General Public License version 3.0 as published by the Free Software
31** Foundation and appearing in the file LICENSE.GPL included in the
32** packaging of this file. Please review the following information to
33** ensure the GNU General Public License version 3.0 requirements will be
34** met: http://www.gnu.org/copyleft/gpl.html.
35**
36** If you are unsure which license is appropriate for your use, please
37** contact the sales department at [email protected].
38** $QT_END_LICENSE$
39**
40****************************************************************************/
41
42#include <qdatetime.h>
43#include <qmainwindow.h>
44#include <qstatusbar.h>
45#include <qmessagebox.h>
46#include <qmenubar.h>
47#include <qapplication.h>
48#include <qpainter.h>
49#include <qprinter.h>
50#include <qlabel.h>
51#include <qimage.h>
52#include <q3progressdialog.h>
53#include <Q3PointArray>
54#include <Q3PtrList>
55#include <QPixmap>
56#include <Q3PopupMenu>
57#include <QMouseEvent>
58#include <Q3MemArray>
59#include "canvas.h"
60#include <QStyleOptionGraphicsItem>
61#include <qdebug.h>
62#include <stdlib.h>
63
64// We use a global variable to save memory - all the brushes and pens in
65// the mesh are shared.
66static QBrush *tb = 0;
67static QPen *tp = 0;
68
69class EdgeItem;
70class NodeItem;
71
72class EdgeItem: public QGraphicsLineItem
73{
74public:
75 EdgeItem( NodeItem*, NodeItem* );
76 void setFromPoint( int x, int y ) ;
77 void setToPoint( int x, int y );
78 static int count() { return c; }
79private:
80 static int c;
81};
82
83static const int imageRTTI = 984376;
84
85
86class ImageItem: public QGraphicsRectItem
87{
88public:
89 ImageItem( QImage img );
90 int rtti () const { return imageRTTI; }
91protected:
92 void paint( QPainter *, const QStyleOptionGraphicsItem *option, QWidget *widget );
93private:
94 QImage image;
95 QPixmap pixmap;
96};
97
98
99ImageItem::ImageItem( QImage img )
100 : image(img)
101{
102 setRect(0, 0, image.width(), image.height());
103 setFlag(ItemIsMovable);
104#if !defined(Q_WS_QWS)
105 pixmap.convertFromImage(image, Qt::OrderedAlphaDither);
106#endif
107}
108
109void ImageItem::paint( QPainter *p, const QStyleOptionGraphicsItem *option, QWidget * )
110{
111// On Qt/Embedded, we can paint a QImage as fast as a QPixmap,
112// but on other platforms, we need to use a QPixmap.
113#if defined(Q_WS_QWS)
114 p->drawImage( option->exposedRect, image, option->exposedRect, Qt::OrderedAlphaDither );
115#else
116 p->drawPixmap( option->exposedRect, pixmap, option->exposedRect );
117#endif
118}
119
120class NodeItem: public QGraphicsEllipseItem
121{
122public:
123 NodeItem();
124 ~NodeItem() {}
125
126 void addInEdge( EdgeItem *edge ) { inList.append( edge ); }
127 void addOutEdge( EdgeItem *edge ) { outList.append( edge ); }
128
129protected:
130 QVariant itemChange(GraphicsItemChange change, const QVariant &value);
131
132
133 // QPoint center() { return boundingRect().center(); }
134private:
135 Q3PtrList<EdgeItem> inList;
136 Q3PtrList<EdgeItem> outList;
137};
138
139
140int EdgeItem::c = 0;
141
142EdgeItem::EdgeItem( NodeItem *from, NodeItem *to )
143 : QGraphicsLineItem( )
144{
145 c++;
146 setPen( *tp );
147 from->addOutEdge( this );
148 to->addInEdge( this );
149 setLine( QLineF(int(from->x()), int(from->y()), int(to->x()), int(to->y()) ));
150 setZValue( 127 );
151 setBoundingRegionGranularity(0.05);
152}
153
154void EdgeItem::setFromPoint( int x, int y )
155{
156 setLine(QLineF( x,y, line().p2().x(), line().p2().y() ));
157}
158
159void EdgeItem::setToPoint( int x, int y )
160{
161 setLine(QLineF( line().p1().x(), line().p1().y(), x, y ));
162}
163
164QVariant NodeItem::itemChange(GraphicsItemChange change, const QVariant &value)
165{
166 if (change == ItemPositionHasChanged) {
167 Q3PtrListIterator<EdgeItem> it1( inList );
168 EdgeItem *edge;
169 while (( edge = it1.current() )) {
170 ++it1;
171 edge->setToPoint( int(x()), int(y()) );
172 }
173 Q3PtrListIterator<EdgeItem> it2( outList );
174 while (( edge = it2.current() )) {
175 ++it2;
176 edge->setFromPoint( int(x()), int(y()) );
177 }
178 }
179
180 return QGraphicsEllipseItem::itemChange(change, value);
181}
182
183NodeItem::NodeItem( )
184 : QGraphicsEllipseItem( QRectF(-3, -3, 6, 6) )
185{
186 setPen( *tp );
187 setBrush( *tb );
188 setZValue( 128 );
189 setFlag(ItemIsMovable);
190}
191
192FigureEditor::FigureEditor(
193 QGraphicsScene& c, QWidget* parent,
194 const char* name, Qt::WindowFlags f) :
195 QGraphicsView(&c,parent)
196{
197 setObjectName(name);
198 setWindowFlags(f);
199 setRenderHints(QPainter::Antialiasing | QPainter::SmoothPixmapTransform);
200}
201
202void FigureEditor::clear()
203{
204 scene()->clear();
205}
206
207BouncyLogo::BouncyLogo() :
208 xvel(0), yvel(0)
209{
210 setPixmap(QPixmap(":/trolltech/examples/graphicsview/portedcanvas/qt-trans.xpm"));
211}
212
213const int logo_rtti = 1234;
214
215int BouncyLogo::type() const
216{
217 return logo_rtti;
218}
219
220QPainterPath BouncyLogo::shape() const
221{
222 QPainterPath path;
223 path.addRect(boundingRect());
224 return path;
225}
226
227void BouncyLogo::initPos()
228{
229 initSpeed();
230 int trial=1000;
231 do {
232 setPos(qrand()%int(scene()->width()),qrand()%int(scene()->height()));
233 advance(0);
234 } while (trial-- && xvel==0.0 && yvel==0.0);
235}
236
237void BouncyLogo::initSpeed()
238{
239 const double speed = 4.0;
240 double d = (double)(qrand()%1024) / 1024.0;
241 xvel = d*speed*2-speed;
242 yvel = (1-d)*speed*2-speed;
243}
244
245void BouncyLogo::advance(int stage)
246{
247 switch ( stage ) {
248 case 0: {
249 double vx = xvel;
250 double vy = yvel;
251
252 if ( vx == 0.0 && vy == 0.0 ) {
253 // stopped last turn
254 initSpeed();
255 vx = xvel;
256 vy = yvel;
257 }
258
259 double nx = x() + vx;
260 double ny = y() + vy;
261
262 if ( nx < 0 || nx >= scene()->width() )
263 vx = -vx;
264 if ( ny < 0 || ny >= scene()->height() )
265 vy = -vy;
266
267 for (int bounce=0; bounce<4; bounce++) {
268 QList<QGraphicsItem *> l=scene()->collidingItems(this);
269 for (QList<QGraphicsItem *>::Iterator it=l.begin(); it!=l.end(); ++it) {
270 QGraphicsItem *hit = *it;
271 QPainterPath advancedShape = QMatrix().translate(xvel, yvel).map(shape());
272 if ( hit->type()==logo_rtti && hit->collidesWithPath(mapToItem(hit, advancedShape)) ) {
273 switch ( bounce ) {
274 case 0:
275 vx = -vx;
276 break;
277 case 1:
278 vy = -vy;
279 vx = -vx;
280 break;
281 case 2:
282 vx = -vx;
283 break;
284 case 3:
285 // Stop for this turn
286 vx = 0;
287 vy = 0;
288 break;
289 }
290 xvel = vx;
291 yvel = vy;
292 break;
293 }
294 }
295 }
296
297 if ( x()+vx < 0 || x()+vx >= scene()->width() )
298 vx = 0;
299 if ( y()+vy < 0 || y()+vy >= scene()->height() )
300 vy = 0;
301
302 xvel = vx;
303 yvel = vy;
304 } break;
305 case 1:
306 moveBy(xvel, yvel);
307 break;
308 }
309}
310
311static uint mainCount = 0;
312static QImage *butterflyimg;
313static QImage *logoimg;
314
315Main::Main(QGraphicsScene& c, QWidget* parent, const char* name, Qt::WindowFlags f) :
316 Q3MainWindow(parent,name,f),
317 canvas(c)
318{
319 editor = new FigureEditor(canvas,this);
320 QMenuBar* menu = menuBar();
321
322 Q3PopupMenu* file = new Q3PopupMenu( menu );
323 file->insertItem("&Fill canvas", this, SLOT(init()), Qt::CTRL+Qt::Key_F);
324 file->insertItem("&Erase canvas", this, SLOT(clear()), Qt::CTRL+Qt::Key_E);
325 file->insertItem("&New view", this, SLOT(newView()), Qt::CTRL+Qt::Key_N);
326 file->insertSeparator();
327 file->insertItem("&Print...", this, SLOT(print()), Qt::CTRL+Qt::Key_P);
328 file->insertSeparator();
329 file->insertItem("E&xit", qApp, SLOT(quit()), Qt::CTRL+Qt::Key_Q);
330 menu->insertItem("&File", file);
331
332 Q3PopupMenu* edit = new Q3PopupMenu( menu );
333 edit->insertItem("Add &Circle", this, SLOT(addCircle()), Qt::ALT+Qt::Key_C);
334 edit->insertItem("Add &Hexagon", this, SLOT(addHexagon()), Qt::ALT+Qt::Key_H);
335 edit->insertItem("Add &Polygon", this, SLOT(addPolygon()), Qt::ALT+Qt::Key_P);
336 edit->insertItem("Add Spl&ine", this, SLOT(addSpline()), Qt::ALT+Qt::Key_I);
337 edit->insertItem("Add &Text", this, SLOT(addText()), Qt::ALT+Qt::Key_T);
338 edit->insertItem("Add &Line", this, SLOT(addLine()), Qt::ALT+Qt::Key_L);
339 edit->insertItem("Add &Rectangle", this, SLOT(addRectangle()), Qt::ALT+Qt::Key_R);
340 edit->insertItem("Add &Sprite", this, SLOT(addSprite()), Qt::ALT+Qt::Key_S);
341 edit->insertItem("Create &Mesh", this, SLOT(addMesh()), Qt::ALT+Qt::Key_M );
342 edit->insertItem("Add &Alpha-blended image", this, SLOT(addButterfly()), Qt::ALT+Qt::Key_A);
343 menu->insertItem("&Edit", edit);
344
345 Q3PopupMenu* view = new Q3PopupMenu( menu );
346 view->insertItem("&Enlarge", this, SLOT(enlarge()), Qt::SHIFT+Qt::CTRL+Qt::Key_Plus);
347 view->insertItem("Shr&ink", this, SLOT(shrink()), Qt::SHIFT+Qt::CTRL+Qt::Key_Minus);
348 view->insertSeparator();
349 view->insertItem("&Rotate clockwise", this, SLOT(rotateClockwise()), Qt::CTRL+Qt::Key_PageDown);
350 view->insertItem("Rotate &counterclockwise", this, SLOT(rotateCounterClockwise()), Qt::CTRL+Qt::Key_PageUp);
351 view->insertItem("&Zoom in", this, SLOT(zoomIn()), Qt::CTRL+Qt::Key_Plus);
352 view->insertItem("Zoom &out", this, SLOT(zoomOut()), Qt::CTRL+Qt::Key_Minus);
353 view->insertItem("Translate left", this, SLOT(moveL()), Qt::CTRL+Qt::Key_Left);
354 view->insertItem("Translate right", this, SLOT(moveR()), Qt::CTRL+Qt::Key_Right);
355 view->insertItem("Translate up", this, SLOT(moveU()), Qt::CTRL+Qt::Key_Up);
356 view->insertItem("Translate down", this, SLOT(moveD()), Qt::CTRL+Qt::Key_Down);
357 view->insertItem("&Mirror", this, SLOT(mirror()), Qt::CTRL+Qt::Key_Home);
358 menu->insertItem("&View", view);
359
360 menu->insertSeparator();
361
362 Q3PopupMenu* help = new Q3PopupMenu( menu );
363 help->insertItem("&About", this, SLOT(help()), Qt::Key_F1);
364 help->setItemChecked(dbf_id, TRUE);
365 menu->insertItem("&Help",help);
366
367 statusBar();
368
369 setCentralWidget(editor);
370
371 printer = 0;
372
373 init();
374}
375
376void Main::init()
377{
378 clear();
379
380 static int r=24;
381 qsrand(++r);
382
383 mainCount++;
384 butterflyimg = 0;
385 logoimg = 0;
386
387 int i;
388 for ( i=0; i < int(canvas.width()) / 56; i++) {
389 addButterfly();
390 }
391 for ( i=0; i < int(canvas.width()) / 85; i++) {
392 addHexagon();
393 }
394 for ( i=0; i < int(canvas.width()) / 128; i++) {
395 addLogo();
396 }
397}
398
399Main::~Main()
400{
401 delete printer;
402 if ( !--mainCount ) {
403 delete[] butterflyimg;
404 butterflyimg = 0;
405 delete[] logoimg;
406 logoimg = 0;
407 }
408}
409
410void Main::newView()
411{
412 // Open a new view... have it delete when closed.
413 Main *m = new Main(canvas, 0, 0, Qt::WDestructiveClose);
414 m->show();
415}
416
417void Main::clear()
418{
419 editor->clear();
420}
421
422void Main::help()
423{
424 static QMessageBox* about = new QMessageBox( "Qt Canvas Example",
425 "<h3>The QCanvas classes example</h3>"
426 "<ul>"
427 "<li> Press ALT-S for some sprites."
428 "<li> Press ALT-C for some circles."
429 "<li> Press ALT-L for some lines."
430 "<li> Drag the objects around."
431 "<li> Read the code!"
432 "</ul>", QMessageBox::Information, 1, 0, 0, this, 0, FALSE );
433 about->setButtonText( 1, "Dismiss" );
434 about->show();
435}
436
437void Main::aboutQt()
438{
439 QMessageBox::aboutQt( this, "Qt Canvas Example" );
440}
441
442void Main::enlarge()
443{
444 canvas.setSceneRect(0, 0, canvas.width()*4/3, canvas.height()*4/3);
445}
446
447void Main::shrink()
448{
449 canvas.setSceneRect(0, 0, qMax(canvas.width()*3/4, qreal(1.0)), qMax(canvas.height()*3/4, qreal(1.0)));
450}
451
452void Main::rotateClockwise()
453{
454 editor->rotate( 22.5 );
455}
456
457void Main::rotateCounterClockwise()
458{
459 editor->rotate( -22.5 );
460}
461
462void Main::zoomIn()
463{
464 editor->scale( 2.0, 2.0 );
465}
466
467void Main::zoomOut()
468{
469 editor->scale( 0.5, 0.5 );
470}
471
472void Main::mirror()
473{
474 editor->scale( -1, 1 );
475}
476
477void Main::moveL()
478{
479 editor->translate( -16, 0 );
480}
481
482void Main::moveR()
483{
484 editor->translate( +16, 0 );
485}
486
487void Main::moveU()
488{
489 editor->translate( 0, -16 );
490}
491
492void Main::moveD()
493{
494 editor->translate( 0, +16 );
495}
496
497void Main::print()
498{
499 if ( !printer ) printer = new QPrinter;
500 if ( printer->setup(this) ) {
501 QPainter pp(printer);
502 canvas.render(&pp);
503 }
504}
505
506
507void Main::addSprite()
508{
509 BouncyLogo* i = new BouncyLogo;
510 canvas.addItem(i);
511 i->initPos();
512 i->setZValue(qrand()%256);
513}
514
515QString butterfly_fn;
516QString logo_fn;
517
518
519void Main::addButterfly()
520{
521 if ( butterfly_fn.isEmpty() )
522 return;
523 if ( !butterflyimg ) {
524 butterflyimg = new QImage[4];
525 butterflyimg[0].load( butterfly_fn );
526 butterflyimg[1] = butterflyimg[0].smoothScale( int(butterflyimg[0].width()*0.75),
527 int(butterflyimg[0].height()*0.75) );
528 butterflyimg[2] = butterflyimg[0].smoothScale( int(butterflyimg[0].width()*0.5),
529 int(butterflyimg[0].height()*0.5) );
530 butterflyimg[3] = butterflyimg[0].smoothScale( int(butterflyimg[0].width()*0.25),
531 int(butterflyimg[0].height()*0.25) );
532 }
533 QAbstractGraphicsShapeItem* i = new ImageItem(butterflyimg[qrand()%4]);
534 canvas.addItem(i);
535 i->setPos(qrand()%int(canvas.width()-butterflyimg->width()),
536 qrand()%int(canvas.height()-butterflyimg->height()));
537 i->setZValue(qrand()%256+250);
538}
539
540void Main::addLogo()
541{
542 if ( logo_fn.isEmpty() )
543 return;
544 if ( !logoimg ) {
545 logoimg = new QImage[4];
546 logoimg[0].load( logo_fn );
547 logoimg[1] = logoimg[0].smoothScale( int(logoimg[0].width()*0.75),
548 int(logoimg[0].height()*0.75) );
549 logoimg[2] = logoimg[0].smoothScale( int(logoimg[0].width()*0.5),
550 int(logoimg[0].height()*0.5) );
551 logoimg[3] = logoimg[0].smoothScale( int(logoimg[0].width()*0.25),
552 int(logoimg[0].height()*0.25) );
553 }
554 QAbstractGraphicsShapeItem* i = new ImageItem(logoimg[qrand()%4]);
555 canvas.addItem(i);
556 i->setPos(qrand()%int(canvas.width()-logoimg->width()),
557 qrand()%int(canvas.height()-logoimg->width()));
558 i->setZValue(qrand()%256+256);
559}
560
561
562
563void Main::addCircle()
564{
565 QAbstractGraphicsShapeItem* i = canvas.addEllipse(QRectF(0,0,50,50));
566 i->setFlag(QGraphicsItem::ItemIsMovable);
567 i->setPen(Qt::NoPen);
568 i->setBrush( QColor(qrand()%32*8,qrand()%32*8,qrand()%32*8) );
569 i->setPos(qrand()%int(canvas.width()),qrand()%int(canvas.height()));
570 i->setZValue(qrand()%256);
571}
572
573void Main::addHexagon()
574{
575 const int size = int(canvas.width() / 25);
576 Q3PointArray pa(6);
577 pa[0] = QPoint(2*size,0);
578 pa[1] = QPoint(size,-size*173/100);
579 pa[2] = QPoint(-size,-size*173/100);
580 pa[3] = QPoint(-2*size,0);
581 pa[4] = QPoint(-size,size*173/100);
582 pa[5] = QPoint(size,size*173/100);
583 QGraphicsPolygonItem* i = canvas.addPolygon(pa);
584 i->setFlag(QGraphicsItem::ItemIsMovable);
585 i->setPen(Qt::NoPen);
586 i->setBrush( QColor(qrand()%32*8,qrand()%32*8,qrand()%32*8) );
587 i->setPos(qrand()%int(canvas.width()),qrand()%int(canvas.height()));
588 i->setZValue(qrand()%256);
589}
590
591void Main::addPolygon()
592{
593 const int size = int(canvas.width()/2);
594 Q3PointArray pa(6);
595 pa[0] = QPoint(0,0);
596 pa[1] = QPoint(size,size/5);
597 pa[2] = QPoint(size*4/5,size);
598 pa[3] = QPoint(size/6,size*5/4);
599 pa[4] = QPoint(size*3/4,size*3/4);
600 pa[5] = QPoint(size*3/4,size/4);
601 QGraphicsPolygonItem* i = canvas.addPolygon(pa);
602 i->setFlag(QGraphicsItem::ItemIsMovable);
603 i->setPen(Qt::NoPen);
604 i->setBrush( QColor(qrand()%32*8,qrand()%32*8,qrand()%32*8) );
605 i->setPos(qrand()%int(canvas.width()),qrand()%int(canvas.height()));
606 i->setZValue(qrand()%256);
607}
608
609void Main::addSpline()
610{
611 const int size = int(canvas.width()/6);
612
613 Q3PointArray pa(12);
614 pa[0] = QPoint(0,0);
615 pa[1] = QPoint(size/2,0);
616 pa[2] = QPoint(size,size/2);
617 pa[3] = QPoint(size,size);
618 pa[4] = QPoint(size,size*3/2);
619 pa[5] = QPoint(size/2,size*2);
620 pa[6] = QPoint(0,size*2);
621 pa[7] = QPoint(-size/2,size*2);
622 pa[8] = QPoint(size/4,size*3/2);
623 pa[9] = QPoint(0,size);
624 pa[10]= QPoint(-size/4,size/2);
625 pa[11]= QPoint(-size/2,0);
626
627 QPainterPath path;
628 path.moveTo(pa[0]);
629 for (int i = 1; i < pa.size(); i += 3)
630 path.cubicTo(pa[i], pa[(i + 1) % pa.size()], pa[(i + 2) % pa.size()]);
631
632 QGraphicsPathItem* item = canvas.addPath(path);
633 item->setFlag(QGraphicsItem::ItemIsMovable);
634 item->setPen(Qt::NoPen);
635 item->setBrush( QColor(qrand()%32*8,qrand()%32*8,qrand()%32*8) );
636 item->setPos(qrand()%int(canvas.width()),qrand()%int(canvas.height()));
637 item->setZValue(qrand()%256);
638}
639
640void Main::addText()
641{
642 QGraphicsTextItem* i = canvas.addText("QCanvasText");
643 i->setFlag(QGraphicsItem::ItemIsMovable);
644 i->setPos(qrand()%int(canvas.width()),qrand()%int(canvas.height()));
645 i->setZValue(qrand()%256);
646}
647
648void Main::addLine()
649{
650 QGraphicsLineItem* i = canvas.addLine(QLineF( qrand()%int(canvas.width()), qrand()%int(canvas.height()),
651 qrand()%int(canvas.width()), qrand()%int(canvas.height()) ));
652 i->setFlag(QGraphicsItem::ItemIsMovable);
653 i->setPen( QPen(QColor(qrand()%32*8,qrand()%32*8,qrand()%32*8), 6) );
654 i->setZValue(qrand()%256);
655}
656
657void Main::addMesh()
658{
659 int x0 = 0;
660 int y0 = 0;
661
662 if ( !tb ) tb = new QBrush( Qt::red );
663 if ( !tp ) tp = new QPen( Qt::black );
664
665 int nodecount = 0;
666
667 int w = int(canvas.width());
668 int h = int(canvas.height());
669
670 const int dist = 30;
671 int rows = h / dist;
672 int cols = w / dist;
673
674#ifndef QT_NO_PROGRESSDIALOG
675 Q3ProgressDialog progress( "Creating mesh...", "Abort", rows,
676 this, "progress", TRUE );
677#endif
678
679 canvas.update();
680
681 Q3MemArray<NodeItem*> lastRow(cols);
682 for ( int j = 0; j < rows; j++ ) {
683 int n = j%2 ? cols-1 : cols;
684 NodeItem *prev = 0;
685 for ( int i = 0; i < n; i++ ) {
686 NodeItem *el = new NodeItem;
687 canvas.addItem(el);
688 nodecount++;
689 int r = qrand();
690 int xrand = r %20;
691 int yrand = (r/20) %20;
692 el->setPos( xrand + x0 + i*dist + (j%2 ? dist/2 : 0 ),
693 yrand + y0 + j*dist );
694
695 if ( j > 0 ) {
696 if ( i < cols-1 )
697 canvas.addItem(new EdgeItem( lastRow[i], el));
698 if ( j%2 )
699 canvas.addItem(new EdgeItem( lastRow[i+1], el));
700 else if ( i > 0 )
701 canvas.addItem(new EdgeItem( lastRow[i-1], el));
702 }
703 if ( prev ) {
704 canvas.addItem(new EdgeItem( prev, el));
705 }
706 if ( i > 0 ) lastRow[i-1] = prev;
707 prev = el;
708 }
709 lastRow[n-1]=prev;
710#ifndef QT_NO_PROGRESSDIALOG
711 progress.setProgress( j );
712 if ( progress.wasCancelled() )
713 break;
714#endif
715 }
716#ifndef QT_NO_PROGRESSDIALOG
717 progress.setProgress( rows );
718#endif
719 // qDebug( "%d nodes, %d edges", nodecount, EdgeItem::count() );
720}
721
722void Main::addRectangle()
723{
724 QAbstractGraphicsShapeItem *i = canvas.addRect( QRectF(qrand()%int(canvas.width()),
725 qrand()%int(canvas.height()),
726 canvas.width()/5,
727 canvas.width()/5) );
728 i->setFlag(QGraphicsItem::ItemIsMovable);
729 int z = qrand()%256;
730 i->setBrush( QColor(z,z,z) );
731 i->setPen( QPen(QColor(qrand()%32*8,qrand()%32*8,qrand()%32*8), 6) );
732 i->setZValue(z);
733}
Note: See TracBrowser for help on using the repository browser.