On 28/06/13 18:56, Phil Thompson wrote:
On Fri, 28 Jun 2013 15:35:20 +1000, Phil <phil_...@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.
Thank you Rob and Phil,
It's still not totally clear to me. Say for example, that I want to
display a frame on the main window and draw a red line on the frame and,
through another function, draw a yellow line on the main window.
I've added the extra class as Rob has suggested but I'm not getting the
result that I expect. The Frame class would be a separate module but
I've put the two classes in the same module for this example.
class DrawTest(QtGui.QMainWindow):
def __init__(self, parent=None):
super(DrawTest, self).__init__(parent)
If I comment out the following two lines then I get a red line on the
frame but only the frame is displayed without the main window.
self.ui = Ui_MainWindow()
self.ui.setupUi(self)
If I comment out the following two lines then, of course, I'm back to
where I started with a yellow line on the main window and the empty
frame is displayed.
self.frame = Frame(self)
self.setCentralWidget(self.frame)
def buttonClicked(self):
print("clicked")
def paintEvent(self, event):
qp = QtGui.QPainter()
qp.begin(self)
pen = QtGui.QPen(QtCore.Qt.yellow, 4)
qp.setPen(pen)
self.drawLine(event, qp)
qp.end()
def drawLine(self, event, qp):
qp.drawLine(10, 10, 30, 30)
class Frame(QtGui.QFrame):
def paintEvent(self, event):
qp = QtGui.QPainter(self)
qp.setPen(QtGui.QPen(QtCore.Qt.red, 4))
qp.drawLine(10,10,30,30)
if __name__ == "__main__":
app = QtGui.QApplication(sys.argv)
mySW = DrawTest()
mySW.show()
sys.exit(app.exec_())
--
Regards,
Phil
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