Dear all,
I'm facing a problem with my application when
a QLinef is superimposed to a color filled QRectf.
I would like to always see the whole QLinef but I only get
a random behaviour. Sometime, the QLinef appear on top
of the QRectf and sometimes it is hidden by the QRectf.
An example is shown above, is there something I'm doing wrong?
Thanks for your help,
Marc.
import sys
from PyQt4.QtCore import Qt, QLineF, QRectF, SIGNAL
from PyQt4.QtGui import QGraphicsScene, QGridLayout, QHBoxLayout,
QGraphicsItem
from PyQt4.QtGui import QDialog, QPainter, QGroupBox, QPushButton,
QVBoxLayout
from PyQt4.QtGui import QApplication, QGraphicsView, QBrush, QColor
class GraphicsView(QGraphicsView):
def __init__(self, parent=None):
super(GraphicsView, self).__init__(parent)
self.setDragMode(QGraphicsView.ScrollHandDrag)
self.setRenderHint(QPainter.Antialiasing)
self.setRenderHint(QPainter.TextAntialiasing)
pass
def wheelEvent(self, event):
factor = 1.41 ** (-event.delta() / 240.0)
self.scale(factor, factor)
pass
pass
class Zone(QGraphicsItem):
def __init__(self):
super(Zone, self).__init__()
self.rect = QRectF(50, 50, 100, 100)
self.color = QColor(255,0,0, 255)
pass
def boundingRect(self):
return self.rect
def paint(self, painter, option, widget=None):
painter.setPen(Qt.NoPen)
painter.setBrush(QBrush(self.color))
painter.drawRect(self.rect)
pass
pass
class Window(QDialog):
def __init__(self, parent=None):
self.W = 300
self.H = 300
super(Window, self).__init__(parent)
self.view = GraphicsView()
self.scene = QGraphicsScene(self)
self.scene.setSceneRect(0, 0, self.W, self.H)
self.view.setScene(self.scene)
grid = QGridLayout()
grid.addWidget(self.createBasicGroup(), 0, 0)
layout = QHBoxLayout()
layout.addWidget(self.view, 1)
layout.addLayout(grid)
self.setLayout(layout)
pass
def createBasicGroup(self):
groupBox = QGroupBox('Basic')
drawButton = QPushButton('(Re-)Draw')
drawButton.setFocusPolicy(Qt.NoFocus)
self.connect(drawButton, SIGNAL("clicked()"), self.setView)
quitButton = QPushButton('Quit')
quitButton.setFocusPolicy(Qt.NoFocus)
self.connect(quitButton, SIGNAL("clicked()"), self.accept)
vbox = QVBoxLayout()
vbox.addWidget(drawButton)
vbox.addWidget(quitButton)
vbox.addStretch(1)
groupBox.setLayout(vbox)
return groupBox
def setView(self):
self.scene.clear()
zone = Zone()
zone.setZValue(0)
self.scene.addItem(zone)
line = QLineF(30, 60, 130, 90)
self.scene.addLine(line, Qt.blue)
pass
pass
app = QApplication(sys.argv)
form = Window()
rect = QApplication.desktop().availableGeometry()
form.resize(int(rect.width() * 0.5), int(rect.height() * 0.5))
form.show()
app.exec_()
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