[PyQt] Drawing on a QFrame

[Phil Thompson]

On Fri, 28 Jun 2013 15:35:20 +1000, Phil <phil_lor at bigpond.com> wrote:
> Thank you for reading this.
> 
> I'd like to draw on a QFrame.
> 
> The following does draw a line but not on the frame, instead the line is

> drawn on the main window.
> 
> I've done this years ago with Qt and C++ but I don't remember how I did
it.
> 
> class DrawTest(QtGui.QMainWindow):
>      def __init__(self, parent=None):
>          super(DrawTest, self).__init__(parent)
>          self.ui = Ui_MainWindow()
>          self.ui.setupUi(self)
>          frame = QtGui.QFrame()
> 
>      def paintEvent(frame, event):
>          qp = QtGui.QPainter()
>          qp.begin(frame)
>          pen = QtGui.QPen(QtCore.Qt.yellow, 4)
>          qp.setPen(pen)
>          frame.drawLine(event, qp)
>          qp.end()
> 
>      def drawLine(frame, event, qp):
>          qp.drawLine(10, 10, 30, 30)

Sub-class the frame and reimplement its paintEvent(). Also make sure the
frame isn't being garbage collected (like it is above) and add it to the
GUI somewhere.

Phil