Initial import of python-qt3

4 files changed, 673 insertions, 0 deletions

diff --git a/examples3/canvas/butterfly.png b/examples3/canvas/butterfly.png
new file mode 100644
index 0000000..d8912d2
--- /dev/null
+++ b/examples3/canvas/butterfly.png
diff --git a/examples3/canvas/canvas.py b/examples3/canvas/canvas.py
new file mode 100755
index 0000000..178a6e6
--- /dev/null
+++ b/examples3/canvas/canvas.py
@@ -0,0 +1,619 @@
+#!/usr/bin/env python
+
+import sys
+from qt import *
+from qtcanvas import *
+import random
+
+
+True = 1
+False = 0
+butterfly_fn = QString.null
+butterflyimg = []
+logo_fn = QString.null
+logoimg = []
+bouncy_logo = None
+views = []
+
+
+class ImageItem(QCanvasRectangle):
+    def __init__(self,img,canvas):
+        QCanvasRectangle.__init__(self,canvas)
+        self.imageRTTI=984376
+        self.image=img
+        self.pixmap=QPixmap()
+        self.setSize(self.image.width(), self.image.height())
+        self.pixmap.convertFromImage(self.image, Qt.OrderedAlphaDither);
+
+    def rtti(self):
+        return self.imageRTTI
+
+    def hit(self,p):
+        ix = p.x()-self.x()
+        iy = p.y()-self.y()
+        if not self.image.valid( ix , iy ):
+            return False
+        self.pixel = self.image.pixel( ix, iy )
+        return  (qAlpha( self.pixel ) != 0)
+
+    def drawShape(self,p):
+        p.drawPixmap( self.x(), self.y(), self.pixmap )
+
+
+class NodeItem(QCanvasEllipse):
+    def __init__(self,canvas):
+        QCanvasEllipse.__init__(self,6,6,canvas)
+        self.__inList=[]
+        self.__outList=[]
+        self.setPen(QPen(Qt.black))
+        self.setBrush(QBrush(Qt.red))
+        self.setZ(128)
+
+    def addInEdge(self,edge):
+        self.__inList.append(edge)
+
+    def addOutEdge(self,edge):
+        self.__outList.append(edge)
+
+    def moveBy(self,dx,dy):
+        QCanvasEllipse.moveBy(self,dx,dy)
+        for each_edge in self.__inList:
+            each_edge.setToPoint( int(self.x()), int(self.y()) )
+        for each_edge in self.__outList:
+            each_edge.setFromPoint( int(self.x()), int(self.y()) )
+
+class EdgeItem(QCanvasLine):
+    __c=0
+    def __init__(self,fromNode, toNode,canvas):
+        QCanvasLine.__init__(self,canvas)
+        self.__c=self.__c+1
+        self.setPen(QPen(Qt.black))
+        self.setBrush(QBrush(Qt.red))
+        fromNode.addOutEdge(self)
+        toNode.addInEdge(self)
+        self.setPoints(int(fromNode.x()),int(fromNode.y()), int(toNode.x()), int(toNode.y()))
+        self.setZ(127)
+
+    def setFromPoint(self,x,y):
+        self.setPoints(x,y,self.endPoint().x(),self.endPoint().y())
+
+    def setToPoint(self,x,y):
+        self.setPoints(self.startPoint().x(), self.startPoint().y(),x,y)
+
+    def count(self):
+        return self.__c
+
+    def moveBy(self,dx,dy):
+        pass
+
+
+class FigureEditor(QCanvasView):
+    def __init__(self,c,parent,name,f):
+        QCanvasView.__init__(self,c,parent,name,f)
+        self.__moving=0
+        self.__moving_start= 0
+
+    def contentsMousePressEvent(self,e): # QMouseEvent e
+        point = self.inverseWorldMatrix().map(e.pos())
+        ilist = self.canvas().collisions(point) #QCanvasItemList ilist
+        for each_item in ilist:
+            if each_item.rtti()==984376:
+                if not each_item.hit(point):
+                    continue
+            self.__moving=each_item
+            self.__moving_start=point
+            return
+        self.__moving=0
+
+    def clear(self):
+        ilist = self.canvas().allItems()
+        for each_item in ilist:
+            if each_item:
+                each_item.setCanvas(None)
+                del each_item
+        self.canvas().update()
+
+    def contentsMouseMoveEvent(self,e):
+        if  self.__moving :
+            point = self.inverseWorldMatrix().map(e.pos());
+            self.__moving.moveBy(point.x() - self.__moving_start.x(),point.y() - self.__moving_start.y())
+            self.__moving_start = point
+        self.canvas().update()
+
+
+class BouncyLogo(QCanvasSprite):
+    def __init__(self,canvas):
+        # Make sure the logo exists.
+        global bouncy_logo
+        if bouncy_logo is None:
+            bouncy_logo=QCanvasPixmapArray("qt-trans.xpm")
+
+        QCanvasSprite.__init__(self,None,canvas)
+        self.setSequence(bouncy_logo)
+        self.setAnimated(True)
+        self.initPos()
+        self.logo_rtti=1234
+
+    def rtti(self):
+        return self.logo_rtti
+
+    def initPos(self):
+        self.initSpeed()
+        trial=1000
+        self.move(random.random()%self.canvas().width(), random.random()%self.canvas().height())
+        self.advance(0)
+        trial=trial-1
+        while (trial & (self.xVelocity()==0 )& (self.yVelocity()==0)):
+            elf.move(random.random()%self.canvas().width(), random.random()%self.canvas().height())
+            self.advance(0)
+            trial=trial-1
+
+    def initSpeed(self):
+        speed=4.0
+        d=random.random()%1024/1024.0
+        self.setVelocity(d*speed*2-speed, (1-d)*speed*2-speed)
+
+    def advance(self,stage):
+        if stage==0:
+            vx=self.xVelocity()
+            vy=self.yVelocity()
+            if (vx==0.0) & (vy==0.0):
+                self.initSpeed()
+                vx=self.xVelocity()
+                vy=self.yVelocity()
+
+            nx=self.x()+vx
+            ny=self.y()+vy
+
+            if (nx<0) | (nx >= self.canvas().width()):
+                vx=-vx
+            if (ny<0) | (ny >= self.canvas().height()):
+                vy=-vy
+
+            for bounce in [0,1,2,3]:
+                l=self.collisions(False)
+                for hit in l:
+                    if (hit.rtti()==1234) & (hit.collidesWith(self)):
+                        if bounce==0:
+                            vx=-vx
+                        elif bounce==1:
+                            vy=-vy
+                            vx=-vx
+                        elif bounce==2:
+                            vx=-vx
+                        elif bounce==3:
+                            vx=0
+                            vy=0
+                        self.setVelocity(vx,vy)
+                        break
+
+            if (self.x()+vx < 0) | (self.x()+vx >= self.canvas().width()):
+                vx=0
+            if (self.y()+vy < 0) | (self.y()+vy >= self.canvas().height()):
+                vy=0
+
+            self.setVelocity(vx,vy)
+        elif stage==1:
+            QCanvasItem.advance(self,stage)
+
+
+class Main (QMainWindow):
+    def __init__(self,c,parent,name,f=0):
+        QMainWindow.__init__(self,parent,name,f)
+        self.editor=FigureEditor(c,self,name,f)
+        self.printer=QPrinter()
+        self.dbf_id=0
+        self.canvas=c
+        self.mainCount=0
+        file=QPopupMenu(self.menuBar())
+        file.insertItem("&Fill canvas", self.init, Qt.CTRL+Qt.Key_F)
+        file.insertItem("&Erase canvas", self.clear, Qt.CTRL+Qt.Key_E)
+        file.insertItem("&New view", self.newView, Qt.CTRL+Qt.Key_N)
+        file.insertSeparator();
+        file.insertItem("&Print", self._print, Qt.CTRL+Qt.Key_P)
+        file.insertSeparator()
+        file.insertItem("E&xit", qApp, SLOT("quit()"), Qt.CTRL+Qt.Key_Q)
+        self.menuBar().insertItem("&File", file)
+
+        edit = QPopupMenu(self.menuBar() )
+        edit.insertItem("Add &Circle",  self.addCircle, Qt.ALT+Qt.Key_C)
+        edit.insertItem("Add &Hexagon",  self.addHexagon, Qt.ALT+Qt.Key_H)
+        edit.insertItem("Add &Polygon",  self.addPolygon, Qt.ALT+Qt.Key_P)
+        edit.insertItem("Add Spl&ine", self.addSpline, Qt.ALT+Qt.Key_I)
+        edit.insertItem("Add &Text", self.addText, Qt.ALT+Qt.Key_T)
+        edit.insertItem("Add &Line", self.addLine, Qt.ALT+Qt.Key_L)
+        edit.insertItem("Add &Rectangle", self.addRectangle, Qt.ALT+Qt.Key_R)
+        edit.insertItem("Add &Sprite", self.addSprite, Qt.ALT+Qt.Key_S)
+        edit.insertItem("Create &Mesh", self.addMesh, Qt.ALT+Qt.Key_M )
+        edit.insertItem("Add &Alpha-blended image", self.addButterfly, Qt.ALT+Qt.Key_A)
+        self.menuBar().insertItem("&Edit", edit)
+
+        view = QPopupMenu(self.menuBar() );
+        view.insertItem("&Enlarge", self.enlarge, Qt.SHIFT+Qt.CTRL+Qt.Key_Plus);
+        view.insertItem("Shr&ink", self.shrink, Qt.SHIFT+Qt.CTRL+Qt.Key_Minus);
+        view.insertSeparator();
+        view.insertItem("&Rotate clockwise", self.rotateClockwise, Qt.CTRL+Qt.Key_PageDown);
+        view.insertItem("Rotate &counterclockwise", self.rotateCounterClockwise, Qt.CTRL+Qt.Key_PageUp);
+        view.insertItem("&Zoom in", self.zoomIn, Qt.CTRL+Qt.Key_Plus);
+        view.insertItem("Zoom &out", self.zoomOut, Qt.CTRL+Qt.Key_Minus);
+        view.insertItem("Translate left", self.moveL, Qt.CTRL+Qt.Key_Left);
+        view.insertItem("Translate right", self.moveR, Qt.CTRL+Qt.Key_Right);
+        view.insertItem("Translate up", self.moveU, Qt.CTRL+Qt.Key_Up);
+        view.insertItem("Translate down", self.moveD, Qt.CTRL+Qt.Key_Down);
+        view.insertItem("&Mirror", self.mirror, Qt.CTRL+Qt.Key_Home);
+        self.menuBar().insertItem("&View", view)
+
+        self.options = QPopupMenu( self.menuBar() );
+        self.dbf_id = self.options.insertItem("Double buffer", self.toggleDoubleBuffer)
+        self.options.setItemChecked(self.dbf_id, True)
+        self.menuBar().insertItem("&Options",self.options)
+
+        self.menuBar().insertSeparator();
+
+        help = QPopupMenu( self.menuBar() )
+        help.insertItem("&About", self.help, Qt.Key_F1)
+        help.insertItem("&About Qt", self.aboutQt, Qt.Key_F2)
+        help.setItemChecked(self.dbf_id, True)
+        self.menuBar().insertItem("&Help",help)
+
+        self.statusBar()
+
+        self.setCentralWidget(self.editor)
+
+        self.printer = 0
+        self.tb=0
+        self.tp=0
+
+        self.init()
+
+    def init(self):
+        self.clear()
+        r=24
+        r=r+1
+        random.seed(r)
+        for i in range(self.canvas.width()/56):
+            self.addButterfly()
+        for j in range(self.canvas.width()/85):
+            self.addHexagon()
+        for k in range(self.canvas.width()/128):
+            self.addLogo()
+
+    def newView(self):
+        m=Main(self.canvas,None,"new windiw",Qt.WDestructiveClose)
+        qApp.setMainWidget(m)
+        m.show()
+        qApp.setMainWidget(None)
+        views.append(m)
+
+    def clear(self):
+        self.editor.clear()
+
+    def help(self):
+        QMessageBox.information(None, "PyQt Canvas Example",
+            "<h3>The PyQt QCanvas classes example</h3><hr>"
+            "<p>This is the PyQt implementation of "
+            "Qt canvas example.</p> by Sadi Kose "
+            "<i>([email protected])</i><hr>"
+            "<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>","Dismiss")
+
+    def aboutQt(self):
+        QMessageBox.aboutQt(self,"PyQt Canvas Example")
+
+    def toggleDoubleBuffer(self):
+        s = not self.options.isItemChecked(self.dbf_id)
+        self.options.setItemChecked(self.dbf_id,s)
+        self.canvas.setDoubleBuffering(s)
+
+    def enlarge(self):
+        self.canvas.resize(self.canvas.width()*4/3, self.canvas.height()*4/3)
+
+    def shrink(self):
+        self.canvas.resize(self.canvas.width()*3/4, self.canvas.height()*3/4)
+
+    def rotateClockwise(self):
+        m = self.editor.worldMatrix()
+        m.rotate( 22.5 )
+        self.editor.setWorldMatrix( m )
+
+    def rotateCounterClockwise(self):
+        m = self.editor.worldMatrix()
+        m.rotate( -22.5 )
+        self.editor.setWorldMatrix( m )
+
+    def zoomIn(self):
+        m = self.editor.worldMatrix()
+        m.scale( 2.0, 2.0 )
+        self.editor.setWorldMatrix( m )
+
+    def zoomOut(self):
+        m = self.editor.worldMatrix()
+        m.scale( 0.5, 0.5 )
+        self.editor.setWorldMatrix( m )
+
+    def mirror(self):
+        m = self.editor.worldMatrix()
+        m.scale( -1, 1 )
+        self.editor.setWorldMatrix( m )
+
+    def moveL(self):
+        m = self.editor.worldMatrix()
+        m.translate( -16, 0 )
+        self.editor.setWorldMatrix( m )
+
+    def moveR(self):
+        m = self.editor.worldMatrix()
+        m.translate( +16, 0 )
+        self.editor.setWorldMatrix( m )
+
+    def moveU(self):
+        m = self.editor.worldMatrix()
+        m.translate( 0, -16 )
+        self.editor.setWorldMatrix( m )
+
+    def moveD(self):
+        m = self.editor.worldMatrix();
+        m.translate( 0, +16 );
+        self.editor.setWorldMatrix( m )
+
+    def _print(self):
+        if not self.printer:
+            self.printer = QPrinter()
+        if  self.printer.setup(self) :
+            pp=QPainter(self.printer)
+        self.canvas.drawArea(QRect(0,0,self.canvas.width(),self.canvas.height()),pp,False)
+
+    def addSprite(self):
+        i = BouncyLogo(self.canvas)
+        i.setZ(256*random.random()%256);
+        i.show();
+
+    def addButterfly(self):
+        if butterfly_fn.isEmpty():
+            return
+        if not butterflyimg:
+            butterflyimg.append(QImage())
+            butterflyimg[0].load(butterfly_fn)
+            butterflyimg.append(QImage())
+            butterflyimg[1] = butterflyimg[0].smoothScale( int(butterflyimg[0].width()*0.75),
+                int(butterflyimg[0].height()*0.75) )
+            butterflyimg.append(QImage())
+            butterflyimg[2] = butterflyimg[0].smoothScale( int(butterflyimg[0].width()*0.5),
+                int(butterflyimg[0].height()*0.5) )
+            butterflyimg.append(QImage())
+            butterflyimg[3] = butterflyimg[0].smoothScale( int(butterflyimg[0].width()*0.25),
+                int(butterflyimg[0].height()*0.25) )
+
+        i = ImageItem(butterflyimg[int(4*random.random()%4)],self.canvas)
+        i.move((self.canvas.width()-butterflyimg[0].width())*random.random()%(self.canvas.width()-butterflyimg[0].width()),
+            (self.canvas.height()-butterflyimg[0].height())*random.random()%(self.canvas.height()-butterflyimg[0].height()))
+        i.setZ(256*random.random()%256+250);
+        i.show()
+
+    def addLogo(self):
+        if logo_fn.isEmpty():
+            return;
+        if not logoimg:
+            logoimg.append(QImage())
+            logoimg[0].load( logo_fn )
+            logoimg.append(QImage())
+            logoimg[1] = logoimg[0].smoothScale( int(logoimg[0].width()*0.75),
+                int(logoimg[0].height()*0.75) )
+            logoimg.append(QImage())
+            logoimg[2] = logoimg[0].smoothScale( int(logoimg[0].width()*0.5),
+                int(logoimg[0].height()*0.5) )
+            logoimg.append(QImage())
+            logoimg[3] = logoimg[0].smoothScale( int(logoimg[0].width()*0.25),
+                int(logoimg[0].height()*0.25) );
+
+        i = ImageItem(logoimg[int(4*random.random()%4)],self.canvas)
+        i.move((self.canvas.width()-logoimg[0].width())*random.random()%(self.canvas.width()-logoimg[0].width()),
+            (self.canvas.height()-logoimg[0].width())*random.random()%(self.canvas.height()-logoimg[0].width()))
+        i.setZ(256*random.random()%256+256)
+        i.show()
+
+    def addCircle(self):
+        i = QCanvasEllipse(50,50,self.canvas)
+        i.setBrush( QBrush(QColor(256*random.random()%32*8,256*random.random()%32*8,256*random.random()%32*8) ))
+        i.move(self.canvas.width()*random.random()%self.canvas.width(),self.canvas.width()*random.random()%self.canvas.height())
+        i.setZ(256*random.random()%256)
+        i.show()
+
+    def addHexagon(self):
+        i = QCanvasPolygon(self.canvas)
+        size = canvas.width() / 25
+        pa=QPointArray(6)
+        pa.setPoint(0,QPoint(2*size,0))
+        pa.setPoint(1,QPoint(size,-size*173/100))
+        pa.setPoint(2,QPoint(-size,-size*173/100))
+        pa.setPoint(3,QPoint(-2*size,0))
+        pa.setPoint(4,QPoint(-size,size*173/100))
+        pa.setPoint(5,QPoint(size,size*173/100))
+        i.setPoints(pa)
+        i.setBrush( QBrush(QColor(256*random.random()%32*8,256*random.random()%32*8,256*random.random()%32*8) ))
+        i.move(self.canvas.width()*random.random()%self.canvas.width(),self.canvas.width()*random.random()%self.canvas.height())
+        i.setZ(256*random.random()%256)
+        i.show()
+
+    def addPolygon(self):
+        i = QCanvasPolygon(self.canvas)
+        size = self.canvas.width()/2
+        pa=QPointArray(6)
+        pa.setPoint(0, QPoint(0,0))
+        pa.setPoint(1, QPoint(size,size/5))
+        pa.setPoint(2, QPoint(size*4/5,size))
+        pa.setPoint(3, QPoint(size/6,size*5/4))
+        pa.setPoint(4, QPoint(size*3/4,size*3/4))
+        pa.setPoint(5, QPoint(size*3/4,size/4))
+
+        i.setPoints(pa)
+        i.setBrush(QBrush( QColor(256*random.random()%32*8,256*random.random()%32*8,256*random.random()%32*8)) )
+        i.move(self.canvas.width()*random.random()%self.canvas.width(),self.canvas.width()*random.random()%self.canvas.height())
+        i.setZ(256*random.random()%256)
+        i.show()
+
+    def addSpline(self):
+        i = QCanvasSpline(self.canvas)
+        size = canvas.width()/6
+        pa=QPointArray(12)
+        pa.setPoint(0,QPoint(0,0))
+        pa.setPoint(1,QPoint(size/2,0))
+        pa.setPoint(2,QPoint(size,size/2))
+        pa.setPoint(3,QPoint(size,size))
+        pa.setPoint(4,QPoint(size,size*3/2))
+        pa.setPoint(5,QPoint(size/2,size*2))
+        pa.setPoint(6,QPoint(0,size*2))
+        pa.setPoint(7,QPoint(-size/2,size*2))
+        pa.setPoint(8,QPoint(size/4,size*3/2))
+        pa.setPoint(9,QPoint(0,size))
+        pa.setPoint(10,QPoint(-size/4,size/2))
+        pa.setPoint(11,QPoint(-size/2,0))
+        i.setControlPoints(pa)
+        i.setBrush( QBrush(QColor(256*random.random()%32*8,256*random.random()%32*8,256*random.random()%32*8) ))
+        i.move(self.canvas.width()*random.random()%self.canvas.width(),self.canvas.width()*random.random()%self.canvas.height())
+        i.setZ(256*random.random()%256)
+        i.show()
+
+    def addText(self):
+        i = QCanvasText(self.canvas)
+        i.setText("QCanvasText")
+        i.move(self.canvas.width()*random.random()%self.canvas.width(),self.canvas.width()*random.random()%self.canvas.height())
+        i.setZ(256*random.random()%256)
+        i.show()
+
+    def addLine(self):
+        i = QCanvasLine(self.canvas);
+        i.setPoints( self.canvas.width()*random.random()%self.canvas.width(), self.canvas.width()*random.random()%self.canvas.height(),
+                self.canvas.width()*random.random()%self.canvas.width(), self.canvas.width()*random.random()%self.canvas.height() )
+        i.setPen( QPen(QColor(256*random.random()%32*8,256*random.random()%32*8,256*random.random()%32*8), 6) )
+        i.setZ(256*random.random()%256)
+        i.show()
+
+    def ternary(self,exp,x,y):
+        if exp:
+            return x
+        else:
+            return y
+
+    def addMesh(self):
+        x0 = 0;
+        y0 = 0;
+
+        if not self.tb:
+            self.tb = QBrush( Qt.red )
+        if not self.tp:
+            self.tp = QPen( Qt.black )
+
+        nodecount = 0;
+
+        w = self.canvas.width()
+        h = self.canvas.height()
+
+        dist = 30
+        rows = h / dist
+        cols = w / dist
+
+        #ifndef QT_NO_PROGRESSDIALOG
+        #progress=QProgressDialog( "Creating mesh...", "Abort", rows,
+        #         self, "progress", True );
+        #endif
+
+        lastRow=[]
+        for c in range(cols):
+            lastRow.append(NodeItem(self.canvas))
+        for j in range(rows):
+            n = self.ternary(j%2 , cols-1 , cols)
+            prev = 0;
+            for i in range(n):
+                el = NodeItem( self.canvas )
+                nodecount=nodecount+1
+                r = 20*20*random.random()
+                xrand = r %20
+                yrand = (r/20) %20
+                el.move( xrand + x0 + i*dist + self.ternary(j%2 , dist/2 , 0 ),
+                    yrand + y0 + j*dist );
+
+                if  j > 0 :
+                    if  i < cols-1 :
+                        EdgeItem( lastRow[i], el, self.canvas ).show()
+                    if  j%2 :
+                        EdgeItem( lastRow[i+1], el, self.canvas ).show()
+                    elif i > 0 :
+                        EdgeItem( lastRow[i-1], el, self.canvas ).show()
+                if  prev:
+                    EdgeItem( prev, el, self.canvas ).show()
+
+                if  i > 0 :
+                    lastRow[i-1] = prev
+                prev = el
+                el.show()
+
+            lastRow[n-1]=prev
+            #ifndef QT_NO_PROGRESSDIALOG
+            #progress.setProgress( j )
+            #if  progress.wasCancelled() :
+            #   break
+            #endif
+
+        #ifndef QT_NO_PROGRESSDIALOG
+        #progress.setProgress( rows )
+        #endif
+        #// qDebug( "%d nodes, %d edges", nodecount, EdgeItem::count() );
+
+    def addRectangle(self):
+        i = QCanvasRectangle( self.canvas.width()*random.random()%self.canvas.width(),
+            self.canvas.width()*random.random()%self.canvas.height(),
+            self.canvas.width()/5,self.canvas.width()/5,self.canvas)
+        z = 256*random.random()%256
+        i.setBrush( QBrush(QColor(z,z,z) ))
+        i.setPen( QPen(QColor(self.canvas.width()*random.random()%32*8,
+            self.canvas.width()*random.random()%32*8,
+            self.canvas.width()*random.random()%32*8), 6) )
+        i.setZ(z)
+        i.show()
+
+
+if __name__=='__main__':
+    app=QApplication(sys.argv)
+
+    if len(sys.argv) > 1:
+        butterfly_fn=QString(sys.argv[1])
+    else:
+        butterfly_fn=QString("butterfly.png")
+
+    if len(sys.argv) > 2:
+        logo_fn = QString(sys.argv[2])
+    else:
+        logo_fn=QString("qtlogo.png")
+
+    canvas=QCanvas(800,600)
+    canvas.setAdvancePeriod(30)
+    m=Main(canvas,None,"pyqt canvas example")
+    m.resize(m.sizeHint())
+
+    qApp.setMainWidget(m)
+    m.setCaption("Qt Canvas Example ported to PyQt")
+    if QApplication.desktop().width() > m.width() + 10 and QApplication.desktop().height() > m.height() + 30:
+        m.show()
+    else:
+        m.showMaximized()
+
+    m.show();
+    #//    m.help();
+    qApp.setMainWidget(None);
+
+    QObject.connect( qApp, SIGNAL("lastWindowClosed()"), qApp, SLOT("quit()") )
+
+    app.exec_loop()
+
+    # We need to explicitly delete the canvas now (and, therefore, the main
+    # window beforehand) to make sure that the sprite logo doesn't get garbage
+    # collected first.
+    views = []
+    del m
+    del canvas
diff --git a/examples3/canvas/qt-trans.xpm b/examples3/canvas/qt-trans.xpm
new file mode 100644
index 0000000..225f684
--- /dev/null
+++ b/examples3/canvas/qt-trans.xpm
@@ -0,0 +1,54 @@
+/* XPM */
+static char *qtlogo_xpm[] = {
+/* width height ncolors chars_per_pixel */
+"54 34 13 1",
+/* colors */
+"  c #000000",
+". c #999999",
+"X c #333366",
+"o c #6666CC",
+"O c #333333",
+"@ c #666699",
+"# c #000066",
+"$ c #666666",
+"% c #3333CC",
+"& c #000033",
+"* c #9999CC",
+"= c #333399",
+"+ c None",
+/* pixels */
+"+++++++++++++++++++.$OOO$.++++++++++++++++++++++++++++",
+"+++++++++++++++++$         O.+++++++++++++++++++++++++",
+"+++++++++++++++.O            $++++++++++++++++++++++++",
+"++++++++++++++.    $.++.$     O+++++++++++++++++++++++",
+"+++++++++++++.   O.+++++++$    O++++++++++++++++++++++",
+"+++++++++++++O   ++++++++++$    $+++++++++++++++++++++",
+"++++++++++++$   .+++++++++++O    .++++++++++++++++++++",
+"+++++++++++.   O+++++++++++++    O++++++.+++++++++++++",
+"+++++++++++$   .+++++++++++++$    .+++.O +++++++++++++",
+"+++++++++++    +++++++++++++++    O+++.  +++++++++++++",
+"++++++++++.  &Xoooo*++++++++++$    +++.  +++++++++++++",
+"++++++++++@=%%%%%%%%%%*+++++++.    .++.  +++++++++++++",
+"+++++++**oooooo**++*o%%%%o+++++    $++O  +++++++++++++",
+"+++++*****$OOX@oooo*++*%%%%%*++O   $+.   OOO$++++++++*",
+"++..+.++....$O$+*ooooo*+*o%%%%%O   O+$   $$O.++++++**+",
+"***+*+++++$$....+++*oooo**+*o%%#   O++O  ++++++***o*++",
+"*+++++++++O  $.....++**oooo**+*X   &o*O  ++++*ooo*++++",
+"++++++++++$   O++.....++**oooo*X   &%%&  ..*o%%*++++++",
+"++++++++++$    ++++.....+++**ooO   $*o&  @oo*+++++++++",
+"++++++++++.    .++++++.....+++*O   Xo*O  .++++++++++++",
+"+++++++++++    O+++++++++......    .++O  +++++++++++++",
+"+++++++++++O    +++.$$$.++++++.   O+++O  +++++++++++++",
+"+++++++++++.    $$OO    O.++++O   .+++O  +++++++++++++",
+"++++++++++++O    .+++.O   $++.   O++++O  +++++++++++++",
+"++++++++++++.    O+++++O   $+O   +++++O  +++++++++++++",
+"+++++++++++++.    O+++++O   O   .+++++O  .++++++++++++",
+"++++++++++++++$     .++++O     .++++.+$  O+.$.++++++++",
+"+++++++++++++++.      O$$O    .+++++...      +++++++++",
+"+++++++++++++++++$            O+++++$$+.O O$.+++++++++",
+"+++++++++++++++++++$OO  O$.O   O.++. .++++++++++++++++",
+"+++++++++++++++++++++++++++.     OO  .++++++++++++++++",
+"++++++++++++++++++++++++++++.       O+++++++++++++++++",
+"+++++++++++++++++++++++++++++.      .+++++++++++++++++",
+"++++++++++++++++++++++++++++++.O  O.++++++++++++++++++"
+};
diff --git a/examples3/canvas/qtlogo.png b/examples3/canvas/qtlogo.png
new file mode 100644
index 0000000..a48b1a1
--- /dev/null
+++ b/examples3/canvas/qtlogo.png