class _SelectionItem(QGraphicsItemGroup):
def __init__(self, parent, path, unscaled_path, label=""):
super().__init__(parent)
self.path = QGraphicsPathItem(path, self)
self.path.setPen(make_pen(width=1, cosmetic=True))
self.addToGroup(self.path)
self.label = QGraphicsSimpleTextItem(label)
self._update_label_pos()
self.addToGroup(self.label)
self.unscaled_path = unscaled_path
def set_path(self, path):
self.path.setPath(path)
self._update_label_pos()
def set_label(self, label):
self.label.setText(label)
self._update_label_pos()
def set_color(self, color):
self.path.setBrush(QColor(color))
def _update_label_pos(self):
path = self.path.path()
elements = (path.elementAt(i) for i in range(path.elementCount()))
points = ((p.x, p.y) for p in elements)
p1, p2, *rest = sorted(points)
x, y = p1[0], (p1[1] + p2[1]) / 2
brect = self.label.boundingRect()
# leaf nodes' paths are 4 pixels higher; leafs are `len(rest) == 3`
self.label.setPos(x - brect.width() - 4,
y - brect.height() + 4 * (len(rest) == 3))
