<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <!-- /home/espenr/tmp/qt-3.3.8-espenr-2499/qt-x11-free-3.3.8/examples/canvas/canvas.doc:1 --> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"> <title>Canvas Example</title> <style type="text/css"><!-- fn { margin-left: 1cm; text-indent: -1cm; } a:link { color: #004faf; text-decoration: none } a:visited { color: #672967; text-decoration: none } body { background: #ffffff; color: black; } --></style> </head> <body> <table border="0" cellpadding="0" cellspacing="0" width="100%"> <tr bgcolor="#E5E5E5"> <td valign=center> <a href="index.html"> <font color="#004faf">Home</font></a> | <a href="classes.html"> <font color="#004faf">All Classes</font></a> | <a href="mainclasses.html"> <font color="#004faf">Main Classes</font></a> | <a href="annotated.html"> <font color="#004faf">Annotated</font></a> | <a href="groups.html"> <font color="#004faf">Grouped Classes</font></a> | <a href="functions.html"> <font color="#004faf">Functions</font></a> </td> <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> <p> This example shows a <a href="qcanvas.html">QCanvas</a> and some <a href="qcanvasitem.html">QCanvasItem</a>s in action. You can do a lot more with QCanvas than we show here, but the example provides a taste of what can be done. <p> <hr> <p> Header file: <p> <pre>#ifndef EXAMPLE_H #define EXAMPLE_H #include <<a href="qpopupmenu-h.html">qpopupmenu.h</a>> #include <<a href="qmainwindow-h.html">qmainwindow.h</a>> #include <<a href="qintdict-h.html">qintdict.h</a>> #include <<a href="qcanvas-h.html">qcanvas.h</a>> class BouncyLogo : public <a href="qcanvassprite.html">QCanvasSprite</a> { void initPos(); void initSpeed(); public: BouncyLogo(QCanvas*); void advance(int); int rtti() const; }; class FigureEditor : public <a href="qcanvasview.html">QCanvasView</a> { <a href="metaobjects.html#Q_OBJECT">Q_OBJECT</a> public: FigureEditor(QCanvas&, QWidget* parent=0, const char* name=0, WFlags f=0); void clear(); protected: void contentsMousePressEvent(QMouseEvent*); void contentsMouseMoveEvent(QMouseEvent*); signals: void status(const <a href="qstring.html">QString</a>&); private: <a href="qcanvasitem.html">QCanvasItem</a>* moving; <a href="qpoint.html">QPoint</a> moving_start; }; class Main : public <a href="qmainwindow.html">QMainWindow</a> { Q_OBJECT public: Main(QCanvas&, QWidget* parent=0, const char* name=0, WFlags f=0); ~Main(); public slots: void help(); private slots: void aboutQt(); void newView(); void clear(); void init(); void addSprite(); void addCircle(); void addHexagon(); void addPolygon(); void addSpline(); void addText(); void addLine(); void addRectangle(); void addMesh(); void addLogo(); void addButterfly(); void enlarge(); void shrink(); void rotateClockwise(); void rotateCounterClockwise(); void zoomIn(); void zoomOut(); void mirror(); void moveL(); void moveR(); void moveU(); void moveD(); void print(); void toggleDoubleBuffer(); private: <a href="qcanvas.html">QCanvas</a>& canvas; FigureEditor *editor; <a href="qpopupmenu.html">QPopupMenu</a>* options; <a href="qprinter.html">QPrinter</a>* printer; int dbf_id; }; #endif </pre> <p> <hr> <p> Implementation: <p> <pre>#include <<a href="qdatetime-h.html">qdatetime.h</a>> #include <<a href="qmainwindow-h.html">qmainwindow.h</a>> #include <<a href="qstatusbar-h.html">qstatusbar.h</a>> #include <<a href="qmessagebox-h.html">qmessagebox.h</a>> #include <<a href="qmenubar-h.html">qmenubar.h</a>> #include <<a href="qapplication-h.html">qapplication.h</a>> #include <<a href="qpainter-h.html">qpainter.h</a>> #include <<a href="qprinter-h.html">qprinter.h</a>> #include <<a href="qlabel-h.html">qlabel.h</a>> #include <<a href="qimage-h.html">qimage.h</a>> #include <<a href="qprogressdialog-h.html">qprogressdialog.h</a>> #include "canvas.h" #include <stdlib.h> // We use a global variable to save memory - all the brushes and pens in // the mesh are shared. static QBrush *tb = 0; static QPen *tp = 0; class EdgeItem; class NodeItem; class EdgeItem: public <a href="qcanvasline.html">QCanvasLine</a> { public: EdgeItem( NodeItem*, NodeItem*, QCanvas *canvas ); void setFromPoint( int x, int y ) ; void setToPoint( int x, int y ); static int count() { return c; } void moveBy(double dx, double dy); private: static int c; }; static const int imageRTTI = 984376; class ImageItem: public <a href="qcanvasrectangle.html">QCanvasRectangle</a> { public: ImageItem( <a href="qimage.html">QImage</a> img, QCanvas *canvas ); int rtti () const { return imageRTTI; } bool hit( const <a href="qpoint.html">QPoint</a>&) const; protected: void drawShape( <a href="qpainter.html">QPainter</a> & ); private: <a href="qimage.html">QImage</a> image; <a href="qpixmap.html">QPixmap</a> pixmap; }; <a name="f623"></a>ImageItem::ImageItem( <a href="qimage.html">QImage</a> img, QCanvas *canvas ) : <a href="qcanvasrectangle.html">QCanvasRectangle</a>( canvas ), image(img) { <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>() ); #if !defined(Q_WS_QWS) <a name="x2943"></a> pixmap.<a href="qpixmap.html#convertFromImage">convertFromImage</a>(image, OrderedAlphaDither); #endif } <a name="x2925"></a>void ImageItem::<a href="qcanvasrectangle.html#drawShape">drawShape</a>( <a href="qpainter.html">QPainter</a> &p ) { // On Qt/Embedded, we can paint a QImage as fast as a QPixmap, // but on other platforms, we need to use a QPixmap. #if defined(Q_WS_QWS) <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 ); #else 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 ); #endif } bool <a name="f624"></a>ImageItem::hit( const <a href="qpoint.html">QPoint</a> &p ) const { <a name="x2944"></a> int ix = p.<a href="qpoint.html#x">x</a>()-int(<a href="qcanvasitem.html#x">x</a>()); <a name="x2945"></a> int iy = p.<a href="qpoint.html#y">y</a>()-int(<a href="qcanvasitem.html#y">y</a>()); <a name="x2934"></a> if ( !image.<a href="qimage.html#valid">valid</a>( ix , iy ) ) return FALSE; <a name="x2933"></a> QRgb pixel = image.<a href="qimage.html#pixel">pixel</a>( ix, iy ); return qAlpha( pixel ) != 0; } class NodeItem: public <a href="qcanvasellipse.html">QCanvasEllipse</a> { public: NodeItem( <a href="qcanvas.html">QCanvas</a> *canvas ); ~NodeItem() {} void addInEdge( EdgeItem *edge ) { inList.<a href="qptrlist.html#append">append</a>( edge ); } void addOutEdge( EdgeItem *edge ) { outList.<a href="qptrlist.html#append">append</a>( edge ); } void moveBy(double dx, double dy); // QPoint center() { return boundingRect().center(); } private: <a href="qptrlist.html">QPtrList</a><EdgeItem> inList; <a href="qptrlist.html">QPtrList</a><EdgeItem> outList; }; int EdgeItem::c = 0; <a name="x2916"></a>void EdgeItem::<a href="qcanvasitem.html#moveBy">moveBy</a>(double, double) { //nothing } <a name="f618"></a>EdgeItem::EdgeItem( NodeItem *from, NodeItem *to, QCanvas *canvas ) : <a href="qcanvasline.html">QCanvasLine</a>( canvas ) { c++; setPen( *tp ); setBrush( *tb ); from->addOutEdge( this ); to->addInEdge( this ); <a name="x2921"></a><a name="x2920"></a> setPoints( int(from-><a href="qcanvasitem.html#x">x</a>()), int(from-><a href="qcanvasitem.html#y">y</a>()), int(to->x()), int(to->y()) ); setZ( 127 ); } void <a name="f619"></a>EdgeItem::setFromPoint( int x, int y ) { setPoints( x,y, endPoint().x(), endPoint().y() ); } void <a name="f620"></a>EdgeItem::setToPoint( int x, int y ) { setPoints( startPoint().x(), startPoint().y(), x, y ); } void NodeItem::<a href="qcanvasitem.html#moveBy">moveBy</a>(double dx, double dy) { QCanvasEllipse::<a href="qcanvasitem.html#moveBy">moveBy</a>( dx, dy ); <a href="qptrlistiterator.html">QPtrListIterator</a><EdgeItem> it1( inList ); EdgeItem *edge; <a name="x2949"></a> while (( edge = it1.<a href="qptrlistiterator.html#current">current</a>() )) { ++it1; edge->setToPoint( int(<a href="qwidget.html#x">x</a>()), int(<a href="qcanvasitem.html#y">y</a>()) ); } <a href="qptrlistiterator.html">QPtrListIterator</a><EdgeItem> it2( outList ); while (( edge = it2.<a href="qptrlistiterator.html#current">current</a>() )) { ++it2; edge->setFromPoint( int(<a href="qcanvasitem.html#x">x</a>()), int(<a href="qcanvasitem.html#y">y</a>()) ); } } <a name="f655"></a>NodeItem::NodeItem( <a href="qcanvas.html">QCanvas</a> *canvas ) : <a href="qcanvasellipse.html">QCanvasEllipse</a>( 6, 6, canvas ) { setPen( *tp ); setBrush( *tb ); <a href="qcanvasitem.html#setZ">setZ</a>( 128 ); } <a name="f621"></a>FigureEditor::FigureEditor( <a href="qcanvas.html">QCanvas</a>& c, QWidget* parent, const char* name, WFlags f) : <a href="qcanvasview.html">QCanvasView</a>(&c,parent,name,f) { } <a name="x2951"></a>void FigureEditor::<a href="qscrollview.html#contentsMousePressEvent">contentsMousePressEvent</a>(QMouseEvent* e) { <a href="qpoint.html">QPoint</a> p = inverseWorldMatrix().map(e->pos()); <a href="qcanvasitemlist.html">QCanvasItemList</a> l=<a href="qcanvasitem.html#canvas">canvas</a>()->collisions(p); <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) { if ( (*it)->rtti() == imageRTTI ) { ImageItem *item= (ImageItem*)(*it); if ( !item->hit( p ) ) continue; } moving = *it; moving_start = p; return; } moving = 0; } void <a name="f622"></a>FigureEditor::clear() { <a href="qcanvasitemlist.html">QCanvasItemList</a> list = <a href="qcanvasitem.html#canvas">canvas</a>()->allItems(); QCanvasItemList::Iterator it = list.<a href="qvaluelist.html#begin">begin</a>(); for (; it != list.<a href="qvaluelist.html#end">end</a>(); ++it) { if ( *it ) delete *it; } } <a name="x2950"></a>void FigureEditor::<a href="qscrollview.html#contentsMouseMoveEvent">contentsMouseMoveEvent</a>(QMouseEvent* e) { if ( moving ) { <a href="qpoint.html">QPoint</a> p = inverseWorldMatrix().map(e->pos()); moving->moveBy(p.<a href="qpoint.html#x">x</a>() - moving_start.x(), p.<a href="qpoint.html#y">y</a>() - moving_start.y()); moving_start = p; <a href="qcanvasitem.html#canvas">canvas</a>()->update(); } } <a name="f615"></a>BouncyLogo::BouncyLogo(QCanvas* canvas) : <a href="qcanvassprite.html">QCanvasSprite</a>(0,canvas) { static QCanvasPixmapArray logo("qt-trans.xpm"); <a href="qcanvassprite.html#setSequence">setSequence</a>(&logo); <a href="qcanvasitem.html#setAnimated">setAnimated</a>(TRUE); initPos(); } const int logo_rtti = 1234; <a name="x2928"></a>int BouncyLogo::<a href="qcanvassprite.html#rtti">rtti</a>() const { return logo_rtti; } void <a name="f616"></a>BouncyLogo::initPos() { initSpeed(); int trial=1000; do { <a href="qcanvassprite.html#move">move</a>(rand()%canvas()->width(),rand()%canvas()->height()); advance(0); } while (trial-- && xVelocity()==0.0 && yVelocity()==0.0); } void <a name="f617"></a>BouncyLogo::initSpeed() { const double speed = 4.0; double d = (double)(rand()%1024) / 1024.0; setVelocity( d*speed*2-speed, (1-d)*speed*2-speed ); } <a name="x2927"></a>void BouncyLogo::<a href="qcanvassprite.html#advance">advance</a>(int stage) { switch ( stage ) { case 0: { double vx = xVelocity(); double vy = yVelocity(); if ( vx == 0.0 && vy == 0.0 ) { // stopped last turn initSpeed(); vx = xVelocity(); vy = yVelocity(); } double nx = <a href="qwidget.html#x">x</a>() + vx; double ny = <a href="qwidget.html#y">y</a>() + vy; if ( nx < 0 || nx >= canvas()->width() ) vx = -vx; if ( ny < 0 || ny >= canvas()->height() ) vy = -vy; for (int bounce=0; bounce<4; bounce++) { <a href="qcanvasitemlist.html">QCanvasItemList</a> l=collisions(FALSE); for (QCanvasItemList::Iterator it=l.<a href="qvaluelist.html#begin">begin</a>(); it!=l.<a href="qvaluelist.html#end">end</a>(); ++it) { <a href="qcanvasitem.html">QCanvasItem</a> *hit = *it; <a name="x2917"></a><a name="x2914"></a> if ( hit-><a href="qcanvasitem.html#rtti">rtti</a>()==logo_rtti && hit-><a href="qcanvasitem.html#collidesWith">collidesWith</a>(this) ) { switch ( bounce ) { case 0: vx = -vx; break; case 1: vy = -vy; vx = -vx; break; case 2: vx = -vx; break; case 3: // Stop for this turn vx = 0; vy = 0; break; } setVelocity(vx,vy); break; } } } if ( <a href="qwidget.html#x">x</a>()+vx < 0 || x()+vx >= canvas()->width() ) vx = 0; if ( <a href="qwidget.html#y">y</a>()+vy < 0 || y()+vy >= canvas()->height() ) vy = 0; setVelocity(vx,vy); } break; case 1: <a name="x2913"></a> <a href="qcanvasitem.html">QCanvasItem</a>::<a href="qcanvasitem.html#advance">advance</a>(stage); break; } } static uint mainCount = 0; static QImage *butterflyimg; static QImage *logoimg; <a name="f625"></a>Main::Main(QCanvas& c, QWidget* parent, const char* name, WFlags f) : <a href="qmainwindow.html">QMainWindow</a>(parent,name,f), canvas(c) { editor = new FigureEditor(canvas,this); <a href="qmenubar.html">QMenuBar</a>* menu = <a href="qmainwindow.html#menuBar">menuBar</a>(); <a href="qpopupmenu.html">QPopupMenu</a>* file = new <a href="qpopupmenu.html">QPopupMenu</a>( menu ); <a name="x2936"></a> file-><a href="qmenudata.html#insertItem">insertItem</a>("&Fill canvas", this, SLOT(init()), CTRL+Key_F); file-><a href="qmenudata.html#insertItem">insertItem</a>("&Erase canvas", this, SLOT(clear()), CTRL+Key_E); file-><a href="qmenudata.html#insertItem">insertItem</a>("&New view", this, SLOT(newView()), CTRL+Key_N); file-><a href="qmenudata.html#insertSeparator">insertSeparator</a>(); file-><a href="qmenudata.html#insertItem">insertItem</a>("&Print...", this, SLOT(print()), CTRL+Key_P); file-><a href="qmenudata.html#insertSeparator">insertSeparator</a>(); file-><a href="qmenudata.html#insertItem">insertItem</a>("E&xit", qApp, SLOT(<a href="qapplication.html#quit">quit</a>()), CTRL+Key_Q); menu-><a href="qmenudata.html#insertItem">insertItem</a>("&File", file); <a href="qpopupmenu.html">QPopupMenu</a>* edit = new <a href="qpopupmenu.html">QPopupMenu</a>( menu ); edit-><a href="qmenudata.html#insertItem">insertItem</a>("Add &Circle", this, SLOT(addCircle()), ALT+Key_C); edit-><a href="qmenudata.html#insertItem">insertItem</a>("Add &Hexagon", this, SLOT(addHexagon()), ALT+Key_H); edit-><a href="qmenudata.html#insertItem">insertItem</a>("Add &Polygon", this, SLOT(addPolygon()), ALT+Key_P); edit-><a href="qmenudata.html#insertItem">insertItem</a>("Add Spl&ine", this, SLOT(addSpline()), ALT+Key_I); edit-><a href="qmenudata.html#insertItem">insertItem</a>("Add &Text", this, SLOT(addText()), ALT+Key_T); edit-><a href="qmenudata.html#insertItem">insertItem</a>("Add &Line", this, SLOT(addLine()), ALT+Key_L); edit-><a href="qmenudata.html#insertItem">insertItem</a>("Add &Rectangle", this, SLOT(addRectangle()), ALT+Key_R); edit-><a href="qmenudata.html#insertItem">insertItem</a>("Add &Sprite", this, SLOT(addSprite()), ALT+Key_S); edit-><a href="qmenudata.html#insertItem">insertItem</a>("Create &Mesh", this, SLOT(addMesh()), ALT+Key_M ); edit-><a href="qmenudata.html#insertItem">insertItem</a>("Add &Alpha-blended image", this, SLOT(addButterfly()), ALT+Key_A); menu-><a href="qmenudata.html#insertItem">insertItem</a>("&Edit", edit); <a href="qpopupmenu.html">QPopupMenu</a>* view = new <a href="qpopupmenu.html">QPopupMenu</a>( menu ); view-><a href="qmenudata.html#insertItem">insertItem</a>("&Enlarge", this, SLOT(enlarge()), SHIFT+CTRL+Key_Plus); view-><a href="qmenudata.html#insertItem">insertItem</a>("Shr&ink", this, SLOT(shrink()), SHIFT+CTRL+Key_Minus); view-><a href="qmenudata.html#insertSeparator">insertSeparator</a>(); view-><a href="qmenudata.html#insertItem">insertItem</a>("&Rotate clockwise", this, SLOT(rotateClockwise()), CTRL+Key_PageDown); view-><a href="qmenudata.html#insertItem">insertItem</a>("Rotate &counterclockwise", this, SLOT(rotateCounterClockwise()), CTRL+Key_PageUp); view-><a href="qmenudata.html#insertItem">insertItem</a>("&Zoom in", this, SLOT(zoomIn()), CTRL+Key_Plus); view-><a href="qmenudata.html#insertItem">insertItem</a>("Zoom &out", this, SLOT(zoomOut()), CTRL+Key_Minus); view-><a href="qmenudata.html#insertItem">insertItem</a>("Translate left", this, SLOT(moveL()), CTRL+Key_Left); view-><a href="qmenudata.html#insertItem">insertItem</a>("Translate right", this, SLOT(moveR()), CTRL+Key_Right); view-><a href="qmenudata.html#insertItem">insertItem</a>("Translate up", this, SLOT(moveU()), CTRL+Key_Up); view-><a href="qmenudata.html#insertItem">insertItem</a>("Translate down", this, SLOT(moveD()), CTRL+Key_Down); view-><a href="qmenudata.html#insertItem">insertItem</a>("&Mirror", this, SLOT(mirror()), CTRL+Key_Home); menu-><a href="qmenudata.html#insertItem">insertItem</a>("&View", view); options = new <a href="qpopupmenu.html">QPopupMenu</a>( menu ); dbf_id = options-><a href="qmenudata.html#insertItem">insertItem</a>("Double buffer", this, SLOT(toggleDoubleBuffer())); <a name="x2939"></a> options-><a href="qmenudata.html#setItemChecked">setItemChecked</a>(dbf_id, TRUE); menu-><a href="qmenudata.html#insertItem">insertItem</a>("&Options",options); menu-><a href="qmenudata.html#insertSeparator">insertSeparator</a>(); <a href="qpopupmenu.html">QPopupMenu</a>* help = new <a href="qpopupmenu.html">QPopupMenu</a>( menu ); help-><a href="qmenudata.html#insertItem">insertItem</a>("&About", this, SLOT(help()), Key_F1); help-><a href="qmenudata.html#setItemChecked">setItemChecked</a>(dbf_id, TRUE); menu-><a href="qmenudata.html#insertItem">insertItem</a>("&Help",help); <a href="qmainwindow.html#statusBar">statusBar</a>(); <a href="qmainwindow.html#setCentralWidget">setCentralWidget</a>(editor); printer = 0; init(); } void <a name="f626"></a>Main::init() { clear(); static int r=24; srand(++r); mainCount++; butterflyimg = 0; logoimg = 0; int i; <a name="x2912"></a> for ( i=0; i<canvas.<a href="qcanvas.html#width">width</a>() / 56; i++) { addButterfly(); } for ( i=0; i<canvas.<a href="qcanvas.html#width">width</a>() / 85; i++) { addHexagon(); } for ( i=0; i<canvas.<a href="qcanvas.html#width">width</a>() / 128; i++) { addLogo(); } } Main::~Main() { delete printer; if ( !--mainCount ) { delete[] butterflyimg; butterflyimg = 0; delete[] logoimg; logoimg = 0; } } void <a name="f627"></a>Main::newView() { // Open a new view... have it delete when closed. Main *m = new Main(canvas, 0, 0, WDestructiveClose); qApp-><a href="qapplication.html#setMainWidget">setMainWidget</a>(m); m-><a href="qwidget.html#show">show</a>(); qApp-><a href="qapplication.html#setMainWidget">setMainWidget</a>(0); } void <a name="f628"></a>Main::clear() { editor->clear(); } void <a name="f629"></a>Main::help() { static QMessageBox* about = new <a href="qmessagebox.html">QMessageBox</a>( "Qt Canvas Example", "<h3>The QCanvas classes example</h3>" "<ul>" "<li> Press ALT-S for some sprites." "<li> Press ALT-C for some circles." "<li> Press ALT-L for some lines." "<li> Drag the objects around." "<li> Read the code!" "</ul>", QMessageBox::Information, 1, 0, 0, this, 0, FALSE ); about->setButtonText( 1, "Dismiss" ); about->show(); } void <a name="f630"></a>Main::aboutQt() { QMessageBox::<a href="qmessagebox.html#aboutQt">aboutQt</a>( this, "Qt Canvas Example" ); } void <a name="f631"></a>Main::toggleDoubleBuffer() { <a name="x2938"></a> bool s = !options-><a href="qmenudata.html#isItemChecked">isItemChecked</a>(dbf_id); options-><a href="qmenudata.html#setItemChecked">setItemChecked</a>(dbf_id,s); <a name="x2911"></a> canvas.<a href="qcanvas.html#setDoubleBuffering">setDoubleBuffering</a>(s); } void <a name="f632"></a>Main::enlarge() { <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); } void <a name="f633"></a>Main::shrink() { 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); } void <a name="f634"></a>Main::rotateClockwise() { <a name="x2931"></a> <a href="qwmatrix.html">QWMatrix</a> m = editor-><a href="qcanvasview.html#worldMatrix">worldMatrix</a>(); <a name="x2955"></a> m.<a href="qwmatrix.html#rotate">rotate</a>( 22.5 ); <a name="x2930"></a> editor-><a href="qcanvasview.html#setWorldMatrix">setWorldMatrix</a>( m ); } void <a name="f635"></a>Main::rotateCounterClockwise() { <a href="qwmatrix.html">QWMatrix</a> m = editor-><a href="qcanvasview.html#worldMatrix">worldMatrix</a>(); m.<a href="qwmatrix.html#rotate">rotate</a>( -22.5 ); editor-><a href="qcanvasview.html#setWorldMatrix">setWorldMatrix</a>( m ); } void <a name="f636"></a>Main::zoomIn() { <a href="qwmatrix.html">QWMatrix</a> m = editor-><a href="qcanvasview.html#worldMatrix">worldMatrix</a>(); <a name="x2956"></a> m.<a href="qwmatrix.html#scale">scale</a>( 2.0, 2.0 ); editor-><a href="qcanvasview.html#setWorldMatrix">setWorldMatrix</a>( m ); } void <a name="f637"></a>Main::zoomOut() { <a href="qwmatrix.html">QWMatrix</a> m = editor-><a href="qcanvasview.html#worldMatrix">worldMatrix</a>(); m.<a href="qwmatrix.html#scale">scale</a>( 0.5, 0.5 ); editor-><a href="qcanvasview.html#setWorldMatrix">setWorldMatrix</a>( m ); } void <a name="f638"></a>Main::mirror() { <a href="qwmatrix.html">QWMatrix</a> m = editor-><a href="qcanvasview.html#worldMatrix">worldMatrix</a>(); m.<a href="qwmatrix.html#scale">scale</a>( -1, 1 ); editor-><a href="qcanvasview.html#setWorldMatrix">setWorldMatrix</a>( m ); } void <a name="f639"></a>Main::moveL() { <a href="qwmatrix.html">QWMatrix</a> m = editor-><a href="qcanvasview.html#worldMatrix">worldMatrix</a>(); <a name="x2957"></a> m.<a href="qwmatrix.html#translate">translate</a>( -16, 0 ); editor-><a href="qcanvasview.html#setWorldMatrix">setWorldMatrix</a>( m ); } void <a name="f640"></a>Main::moveR() { <a href="qwmatrix.html">QWMatrix</a> m = editor-><a href="qcanvasview.html#worldMatrix">worldMatrix</a>(); m.<a href="qwmatrix.html#translate">translate</a>( +16, 0 ); editor-><a href="qcanvasview.html#setWorldMatrix">setWorldMatrix</a>( m ); } void <a name="f641"></a>Main::moveU() { <a href="qwmatrix.html">QWMatrix</a> m = editor-><a href="qcanvasview.html#worldMatrix">worldMatrix</a>(); m.<a href="qwmatrix.html#translate">translate</a>( 0, -16 ); editor-><a href="qcanvasview.html#setWorldMatrix">setWorldMatrix</a>( m ); } void <a name="f642"></a>Main::moveD() { <a href="qwmatrix.html">QWMatrix</a> m = editor-><a href="qcanvasview.html#worldMatrix">worldMatrix</a>(); m.<a href="qwmatrix.html#translate">translate</a>( 0, +16 ); editor-><a href="qcanvasview.html#setWorldMatrix">setWorldMatrix</a>( m ); } void <a name="f643"></a>Main::print() { if ( !printer ) printer = new <a href="qprinter.html">QPrinter</a>; if ( printer->setup(this) ) { <a href="qpainter.html">QPainter</a> pp(printer); <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>()),&pp,FALSE); } } void <a name="f644"></a>Main::addSprite() { <a href="qcanvasitem.html">QCanvasItem</a>* i = new BouncyLogo(&canvas); <a name="x2918"></a> i-><a href="qcanvasitem.html#setZ">setZ</a>(rand()%256); <a name="x2919"></a> i-><a href="qcanvasitem.html#show">show</a>(); } QString butterfly_fn; QString logo_fn; void <a name="f645"></a>Main::addButterfly() { if ( butterfly_fn.isEmpty() ) return; if ( !butterflyimg ) { butterflyimg = new <a href="qimage.html">QImage</a>[4]; butterflyimg[0].load( butterfly_fn ); butterflyimg[1] = butterflyimg[0].smoothScale( int(butterflyimg[0].width()*0.75), int(butterflyimg[0].height()*0.75) ); butterflyimg[2] = butterflyimg[0].smoothScale( int(butterflyimg[0].width()*0.5), int(butterflyimg[0].height()*0.5) ); butterflyimg[3] = butterflyimg[0].smoothScale( int(butterflyimg[0].width()*0.25), int(butterflyimg[0].height()*0.25) ); } <a href="qcanvaspolygonalitem.html">QCanvasPolygonalItem</a>* i = new ImageItem(butterflyimg[rand()%4],&canvas); <a name="x2915"></a> i-><a href="qcanvasitem.html#move">move</a>(rand()%(canvas.<a href="qcanvas.html#width">width</a>()-butterflyimg-><a href="qimage.html#width">width</a>()), rand()%(canvas.<a href="qcanvas.html#height">height</a>()-butterflyimg-><a href="qimage.html#height">height</a>())); i-><a href="qcanvasitem.html#setZ">setZ</a>(rand()%256+250); i-><a href="qcanvasitem.html#show">show</a>(); } void <a name="f646"></a>Main::addLogo() { if ( logo_fn.isEmpty() ) return; if ( !logoimg ) { logoimg = new <a href="qimage.html">QImage</a>[4]; logoimg[0].load( logo_fn ); logoimg[1] = logoimg[0].smoothScale( int(logoimg[0].width()*0.75), int(logoimg[0].height()*0.75) ); logoimg[2] = logoimg[0].smoothScale( int(logoimg[0].width()*0.5), int(logoimg[0].height()*0.5) ); logoimg[3] = logoimg[0].smoothScale( int(logoimg[0].width()*0.25), int(logoimg[0].height()*0.25) ); } <a href="qcanvaspolygonalitem.html">QCanvasPolygonalItem</a>* i = new ImageItem(logoimg[rand()%4],&canvas); i-><a href="qcanvasitem.html#move">move</a>(rand()%(canvas.<a href="qcanvas.html#width">width</a>()-logoimg-><a href="qimage.html#width">width</a>()), rand()%(canvas.<a href="qcanvas.html#height">height</a>()-logoimg-><a href="qimage.html#width">width</a>())); i-><a href="qcanvasitem.html#setZ">setZ</a>(rand()%256+256); i-><a href="qcanvasitem.html#show">show</a>(); } void <a name="f647"></a>Main::addCircle() { <a href="qcanvaspolygonalitem.html">QCanvasPolygonalItem</a>* i = new <a href="qcanvasellipse.html">QCanvasEllipse</a>(50,50,&canvas); <a name="x2923"></a> i-><a href="qcanvaspolygonalitem.html#setBrush">setBrush</a>( QColor(rand()%32*8,rand()%32*8,rand()%32*8) ); i-><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>()); i-><a href="qcanvasitem.html#setZ">setZ</a>(rand()%256); i-><a href="qcanvasitem.html#show">show</a>(); } void <a name="f648"></a>Main::addHexagon() { <a href="qcanvaspolygon.html">QCanvasPolygon</a>* i = new <a href="qcanvaspolygon.html">QCanvasPolygon</a>(&canvas); const int size = canvas.<a href="qcanvas.html#width">width</a>() / 25; <a href="qpointarray.html">QPointArray</a> pa(6); pa[0] = QPoint(2*size,0); pa[1] = QPoint(size,-size*173/100); pa[2] = QPoint(-size,-size*173/100); pa[3] = QPoint(-2*size,0); pa[4] = QPoint(-size,size*173/100); pa[5] = QPoint(size,size*173/100); <a name="x2922"></a> i-><a href="qcanvasline.html#setPoints">setPoints</a>(pa); i-><a href="qcanvaspolygonalitem.html#setBrush">setBrush</a>( QColor(rand()%32*8,rand()%32*8,rand()%32*8) ); i-><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>()); i-><a href="qcanvasitem.html#setZ">setZ</a>(rand()%256); i-><a href="qcanvasitem.html#show">show</a>(); } void <a name="f649"></a>Main::addPolygon() { <a href="qcanvaspolygon.html">QCanvasPolygon</a>* i = new <a href="qcanvaspolygon.html">QCanvasPolygon</a>(&canvas); const int size = canvas.<a href="qcanvas.html#width">width</a>()/2; <a href="qpointarray.html">QPointArray</a> pa(6); pa[0] = QPoint(0,0); pa[1] = QPoint(size,size/5); pa[2] = QPoint(size*4/5,size); pa[3] = QPoint(size/6,size*5/4); pa[4] = QPoint(size*3/4,size*3/4); pa[5] = QPoint(size*3/4,size/4); i-><a href="qcanvasline.html#setPoints">setPoints</a>(pa); i-><a href="qcanvaspolygonalitem.html#setBrush">setBrush</a>( QColor(rand()%32*8,rand()%32*8,rand()%32*8) ); i-><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>()); i-><a href="qcanvasitem.html#setZ">setZ</a>(rand()%256); i-><a href="qcanvasitem.html#show">show</a>(); } void <a name="f650"></a>Main::addSpline() { <a href="qcanvasspline.html">QCanvasSpline</a>* i = new <a href="qcanvasspline.html">QCanvasSpline</a>(&canvas); const int size = canvas.<a href="qcanvas.html#width">width</a>()/6; <a href="qpointarray.html">QPointArray</a> pa(12); pa[0] = QPoint(0,0); pa[1] = QPoint(size/2,0); pa[2] = QPoint(size,size/2); pa[3] = QPoint(size,size); pa[4] = QPoint(size,size*3/2); pa[5] = QPoint(size/2,size*2); pa[6] = QPoint(0,size*2); pa[7] = QPoint(-size/2,size*2); pa[8] = QPoint(size/4,size*3/2); pa[9] = QPoint(0,size); pa[10]= QPoint(-size/4,size/2); pa[11]= QPoint(-size/2,0); <a name="x2926"></a> i-><a href="qcanvasspline.html#setControlPoints">setControlPoints</a>(pa); i-><a href="qcanvaspolygonalitem.html#setBrush">setBrush</a>( QColor(rand()%32*8,rand()%32*8,rand()%32*8) ); i-><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>()); i-><a href="qcanvasitem.html#setZ">setZ</a>(rand()%256); i-><a href="qcanvasitem.html#show">show</a>(); } void <a name="f651"></a>Main::addText() { <a href="qcanvastext.html">QCanvasText</a>* i = new <a href="qcanvastext.html">QCanvasText</a>(&canvas); <a name="x2929"></a> i-><a href="qcanvastext.html#setText">setText</a>("QCanvasText"); i-><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>()); i-><a href="qcanvasitem.html#setZ">setZ</a>(rand()%256); i-><a href="qcanvasitem.html#show">show</a>(); } void <a name="f652"></a>Main::addLine() { <a href="qcanvasline.html">QCanvasLine</a>* i = new <a href="qcanvasline.html">QCanvasLine</a>(&canvas); i-><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>(), rand()%canvas.<a href="qcanvas.html#width">width</a>(), rand()%canvas.<a href="qcanvas.html#height">height</a>() ); <a name="x2924"></a> i-><a href="qcanvaspolygonalitem.html#setPen">setPen</a>( QPen(QColor(rand()%32*8,rand()%32*8,rand()%32*8), 6) ); i-><a href="qcanvasitem.html#setZ">setZ</a>(rand()%256); i-><a href="qcanvasitem.html#show">show</a>(); } void <a name="f653"></a>Main::addMesh() { int x0 = 0; int y0 = 0; if ( !tb ) tb = new <a href="qbrush.html">QBrush</a>( Qt::red ); if ( !tp ) tp = new <a href="qpen.html">QPen</a>( Qt::black ); int nodecount = 0; int w = canvas.<a href="qcanvas.html#width">width</a>(); int h = canvas.<a href="qcanvas.html#height">height</a>(); const int dist = 30; int rows = h / dist; int cols = w / dist; #ifndef QT_NO_PROGRESSDIALOG <a href="qprogressdialog.html">QProgressDialog</a> progress( "Creating mesh...", "Abort", rows, this, "progress", TRUE ); #endif <a href="qmemarray.html">QMemArray</a><NodeItem*> lastRow(cols); for ( int j = 0; j < rows; j++ ) { int n = j%2 ? cols-1 : cols; NodeItem *prev = 0; for ( int i = 0; i < n; i++ ) { NodeItem *el = new NodeItem( &canvas ); nodecount++; int r = rand(); int xrand = r %20; int yrand = (r/20) %20; el-><a href="qcanvasitem.html#move">move</a>( xrand + x0 + i*dist + (j%2 ? dist/2 : 0 ), yrand + y0 + j*dist ); if ( j > 0 ) { if ( i < cols-1 ) (new EdgeItem( lastRow[i], el, &canvas ))->show(); if ( j%2 ) (new EdgeItem( lastRow[i+1], el, &canvas ))->show(); else if ( i > 0 ) (new EdgeItem( lastRow[i-1], el, &canvas ))->show(); } if ( prev ) { (new EdgeItem( prev, el, &canvas ))->show(); } if ( i > 0 ) lastRow[i-1] = prev; prev = el; el-><a href="qcanvasitem.html#show">show</a>(); } lastRow[n-1]=prev; #ifndef QT_NO_PROGRESSDIALOG <a name="x2946"></a> progress.<a href="qprogressdialog.html#setProgress">setProgress</a>( j ); <a name="x2947"></a> if ( progress.<a href="qprogressdialog.html#wasCancelled">wasCancelled</a>() ) break; #endif } #ifndef QT_NO_PROGRESSDIALOG progress.<a href="qprogressdialog.html#setProgress">setProgress</a>( rows ); #endif // qDebug( "%d nodes, %d edges", nodecount, EdgeItem::count() ); } void <a name="f654"></a>Main::addRectangle() { <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>(), canvas.<a href="qcanvas.html#width">width</a>()/5,canvas.<a href="qcanvas.html#width">width</a>()/5,&canvas); int z = rand()%256; i-><a href="qcanvaspolygonalitem.html#setBrush">setBrush</a>( QColor(z,z,z) ); i-><a href="qcanvaspolygonalitem.html#setPen">setPen</a>( QPen(QColor(rand()%32*8,rand()%32*8,rand()%32*8), 6) ); i-><a href="qcanvasitem.html#setZ">setZ</a>(z); i-><a href="qcanvasitem.html#show">show</a>(); } </pre> <p> <hr> <p> Main: <p> <pre>#include <<a href="qstatusbar-h.html">qstatusbar.h</a>> #include <<a href="qmessagebox-h.html">qmessagebox.h</a>> #include <<a href="qmenubar-h.html">qmenubar.h</a>> #include <<a href="qapplication-h.html">qapplication.h</a>> #include <<a href="qimage-h.html">qimage.h</a>> #include "canvas.h" #include <stdlib.h> extern QString butterfly_fn; extern QString logo_fn; int main(int argc, char** argv) { <a href="qapplication.html">QApplication</a> app(argc,argv); if ( argc > 1 ) butterfly_fn = argv[1]; else butterfly_fn = "butterfly.png"; if ( argc > 2 ) logo_fn = argv[2]; else logo_fn = "qtlogo.png"; <a href="qcanvas.html">QCanvas</a> canvas(800,600); <a name="x2962"></a> canvas.<a href="qcanvas.html#setAdvancePeriod">setAdvancePeriod</a>(30); Main m(canvas); <a name="x2969"></a> m.<a href="qwidget.html#resize">resize</a>(m.<a href="qwidget.html#sizeHint">sizeHint</a>()); m.<a href="qwidget.html#setCaption">setCaption</a>("Qt Example - Canvas"); <a name="x2970"></a><a name="x2958"></a> if ( QApplication::<a href="qapplication.html#desktop">desktop</a>()->width() > m.<a href="qwidget.html#width">width</a>() + 10 <a name="x2964"></a> && QApplication::<a href="qapplication.html#desktop">desktop</a>()->height() > m.<a href="qwidget.html#height">height</a>() +30 ) m.<a href="qwidget.html#show">show</a>(); else <a name="x2968"></a> m.<a href="qwidget.html#showMaximized">showMaximized</a>(); 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>()) ); return app.<a href="qapplication.html#exec">exec</a>(); } </pre> <p>See also <a href="examples.html">Examples</a>. <!-- eof --> <p><address><hr><div align=center> <table width=100% cellspacing=0 border=0><tr> <td>Copyright © 2007 <a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a> <td align=right><div align=right>Qt 3.3.8</div> </table></div></address></body> </html>