def itemChange(self, change, value):
if change == QGraphicsItem.ItemPositionHasChanged:
if value.x() < 0 or value.y() < 0:
if value.x() < 0: x = 0
else: x = value.x()
if value.y() < 0: y = 0
else: y = value.y()
value = QPointF(x,y)
self.setPos(value)
return
#this works!
# do other work, or emit signal
return QGraphicsPixmapItem.itemChange(self, change, value)
def itemChange(self, change, value):
if change == self.ItemSelectedHasChanged:
if self.isSelected():
self.setPixmap(self.selection_pixmap)
else:
self.setPixmap(self.pixmap)
if change == self.ItemPositionHasChanged:
x, y = self.pos().x(), self.pos().y()
lon, lat = self.view.to_geographical_coordinates(x, y)
lon, lat = round(lon, 4), round(lat, 4)
self.longitude, self.latitude = lon, lat
# when the node is created, the ItemPositionHasChanged is triggered:
# we create the label
if not hasattr(self, 'label'):
self.label = self.view.scene.addSimpleText('test')
self.label.setZValue(15)
self.label.setPos(self.pos() + QPoint(-70, 50))
self.label.setText('({}, {})'.format(lon, lat))
return QGraphicsPixmapItem.itemChange(self, change, value)
