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QGraphicsView is a class with scrolled graph window...
Re-draw widget immediately when its property is changed
When QPushButton is pressed and connected method is called, all button properties stay unchanged until the method. In order to see current changes one has to re-draw widget. For example:
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Graphics in PyQt4
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self.poi1 = QtCore.QPoint(0,0)
self.poi2 = QtCore.QPoint(0,0)
self.rect1 = QtCore.QRect()
self.rect2 = QtCore.QRect()
self.pen1 = QtGui.QPen(QtCore.Qt.black)
self.pen2 = QtGui.QPen(QtCore.Qt.white)
self.pen1.setStyle(QtCore.Qt.DashLine)
self.pen2.setStyle(QtCore.Qt.DashLine)
self.pen1.setWidthF(1)
self.pen2.setWidthF(1)
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def paintEvent(self, e):
super(GUIImage,self).paintEvent(e)
qp = QtGui.QPainter()
# or QPainter can be defined earlier and use it as qp = self.qp
qp.begin(self)
#self.drawPixmap(qp)
self.drawRect(qp)
qp.end()
self.update()
def setPen(self, qp):
self.pen.setStyle(QtCore.Qt.DashLine)
self.pen.setWidthF(1)
def drawRect(self, qp):
if self.r_pixmap == None:
return
p1x, p1y = self.poi1.x(), self.poi1.y()
p2x, p2y = self.poi2.x(), self.poi2.y()
R=1
if abs(p2x-p1x) < R : return
if abs(p2y-p1y) < R : return
self.rect1.setCoords( p1x, p1y, p2x, p2y)
self.rect2.setCoords( p1x+1, p1y+1, p2x-1, p2y-1)
qp.setPen (self.pen1)
qp.drawRect(self.rect1);
qp.setPen (self.pen2)
qp.drawRect(self.rect2);
def drawPixmap(self, qp):
if self.r_pixmap != None:
qp.drawPixmap(0,0,self.s_pixmap)
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