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"""
# Copyright 2020 Adobe
# All Rights Reserved.
# NOTICE: Adobe permits you to use, modify, and distribute this file in
# accordance with the terms of the Adobe license agreement accompanying
# it.
"""
import numpy as np
def area_of_triangle(pts):
AB = pts[1, :] - pts[0, :]
AC = pts[2, :] - pts[0, :]
return 0.5 * np.linalg.norm(np.cross(AB, AC))
def area_of_polygon(pts):
l = pts.shape[0]
s = 0
for i in range(1, l-1):
s += area_of_triangle(pts[(0, i, i+1), :])
return s
def area_of_signed_triangle(pts):
AB = pts[1, :] - pts[0, :]
AC = pts[2, :] - pts[0, :]
return 0.5 * np.cross(AB, AC)
def area_of_signed_polygon(pts):
l = pts.shape[0]
s = 0
for i in range(1, l-1):
s += area_of_signed_triangle(pts[(0, i, i+1), :])
return s |