hi,
I posted that question few days ago, but no answers. Maybe nobody use
QGraphicItem. I do not know. I am new at pyqt (still reading the pyqt
book !).
Please, let me know if there is a better place to talk about
QGraphicsItem, View, Scene, .... I will use it a lot during the next
month. it's a great tool compare to what I was using before.
here was my question,
I use setClipRegion() in the paint() method of a QGraphicsItem.
That Item has got many children. I would like to avoid repeating the
setClipRegion() in all of them.
Thus, I would like to know if it's possible to "propagate" that
Clipping to the children, automatically.
In attachment, a simple .py that show the clipping "not propagating"
from parent to children.
Thanks for your help!
#!/usr/bin/env python
import sys
from PyQt4.QtCore import *
from PyQt4.QtGui import *
class BoxItem(QGraphicsItem):
def __init__(self, position, color, rect):
super(BoxItem, self).__init__()
self.setFlags(QGraphicsItem.ItemIsSelectable|
QGraphicsItem.ItemIsMovable|
QGraphicsItem.ItemIsFocusable)
self.rect = rect
self.color = color
self.setPos(position)
self.setMatrix(QMatrix())
def boundingRect(self):
return self.rect
def paint(self, painter, option, widget):
painter.setClipRegion(QRegion(QRect(0, 0, 20, 20)))
painter.setPen(Qt.NoPen)
painter.setBrush(QBrush(self.color))
painter.drawRect(self.rect)
class IntBoxItem(QGraphicsItem):
def __init__(self, position, color, rect, parent):
super(IntBoxItem, self).__init__(parent)
self.setFlags(QGraphicsItem.ItemIsSelectable|
QGraphicsItem.ItemIsMovable|
QGraphicsItem.ItemIsFocusable)
self.rect = rect
self.color = color
self.setPos(position)
self.setMatrix(QMatrix())
self.setOpacity(0.7)
def boundingRect(self):
return self.rect
def paint(self, painter, option, widget):
painter.setPen(Qt.NoPen)
painter.setBrush(QBrush(self.color))
painter.drawRect(self.rect)
class MainForm(QDialog):
def __init__(self, parent=None):
super(MainForm, self).__init__(parent)
self.scene = QGraphicsScene(self)
self.scene.setSceneRect(0, 0, 200, 200)
self.view = QGraphicsView()
self.view.setScene(self.scene)
layout = QVBoxLayout()
layout.addWidget(self.view)
self.setLayout(layout)
self.r1 = BoxItem(QPointF(0, 0), QColor(255, 0, 0), QRectF(0, 0, 100, 100))
self.r2 = IntBoxItem(QPointF(0, 0), QColor(255, 255, 0), QRectF(0, 0, 50, 50), self.r1)
self.scene.addItem(self.r1)
app = QApplication(sys.argv)
form = MainForm()
form.show()
app.exec_()
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