提交 37281832 编写于 作者: littletomatodonkey's avatar littletomatodonkey

fix are calc for polygon

上级 895d44bc
......@@ -84,11 +84,12 @@ class MakeShrinkMap(object):
return polygons, ignore_tags
def polygon_area(self, polygon):
# return cv2.contourArea(polygon.astype(np.float32))
edge = 0
for i in range(polygon.shape[0]):
next_index = (i + 1) % polygon.shape[0]
edge += (polygon[next_index, 0] - polygon[i, 0]) * (
polygon[next_index, 1] - polygon[i, 1])
return edge / 2.
"""
compute polygon area
"""
area = 0
q = polygon[-1]
for p in polygon:
area += p[0] * q[1] - p[1] * q[0]
q = p
return area / 2.0
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