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Product features · Exact triangle barycentric coordinates
01
In BarySlate, discuss triangle orientation and signed weights before interpreting whether a point lies inside.
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Exact triangle barycentric coordinates
● ● ●BarySlate●
A concrete starting point · Exact triangle barycentric coordinates ×
from fractions import Fraction
def barycentric(vertices, point):
vertices, point = tuple(tuple(v) for v in vertices), tuple(point)
if len(vertices) != 3 or any(len(v) != 2 for v in vertices) or len(point) != 2:
raise ValueError("triangle.shape")
if any(type(c) is not int or abs(c) > 10000 for v in vertices + (point,) for c in v):
raise ValueError("coordinate.range")
(x0, y0), (x1, y1), (x2, y2) = vertices
x, y = point
den = (y1-y2)*(x0-x2) + (x2-x1)*(y0-y2)
if den == 0:
raise ValueError("triangle.degenerate")
a = Fraction((y1-y2)*(x-x2) + (x2-x1)*(y-y2), den)
b = Fraction((y2-y0)*(x-x2) + (x0-x2)*(y-y2), den)
return a, b, 1-a-b✳Compute exact barycentric weights from three integer vertices and an integer point with coordinate magnitudes at most 10000.
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