Clip only x1 and y1 for intersectingEdges

labelme/widgets/canvas.py

@@ -560,12 +560,9 @@ def intersectionPoint(self, p1, p2):
  (size.width() - 1, 0),
  (size.width() - 1, size.height() - 1),
  (0, size.height() - 1)]
- # FIXME: below clipping is unnecessary on Linux and Mac,
- # but required on Windows to avoid error in intersectingEdges
+ # x1, y1 should be in the pixmap, x2, y2 should be out of the pixmap
  x1 = min(max(p1.x(), 0), size.width() - 1)
- x2 = min(max(p2.x(), 0), size.width() - 1)
  y1 = min(max(p1.y(), 0), size.height() - 1)
- y2 = min(max(p2.y(), 0), size.height() - 1)
  d, i, (x, y) = min(self.intersectingEdges((x1, y1), (x2, y2), points))
  x3, y3 = points[i]
  x4, y4 = points[(i + 1) % 4]