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2c67b8cf39
@ -104,37 +104,17 @@ class Edge(object):
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self.mpoints.append(p)
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self.mpoints.append(q)
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##
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## NOTE Rounding accuracy significantly effects numerical robustness!!!
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##
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def is_above(self, point):
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cdef double *a = [self.p.x, self.p.y]
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cdef double *b = [self.q.x, self.q.y]
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cdef double *c = [point.x, point.y]
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return orient2d(a, b, c) < 0
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return orient2d(a, b, c) < 0.0
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def is_below(self, point):
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cdef double *a = [self.p.x, self.p.y]
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cdef double *b = [self.q.x, self.q.y]
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cdef double *c = [point.x, point.y]
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return orient2d(a, b, c) > 0
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def intersect(self, c, d):
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a = self.p
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b = self.q
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a1 = self.signed_area(a, b, d)
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a2 = self.signed_area(a, b, c)
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if a1 != 0.0 and a2 != 0.0 and (a1 * a2) < 0.0:
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a3 = self.signed_area(c, d, a)
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a4 = a3 + a2 - a1
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if a3 * a4 < 0.0:
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t = a3 / (a3 - a4)
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return a + ((b - a) * t)
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return 0.0
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def signed_area(self, a, b, c):
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return (a.x - c.x) * (b.y - c.y) - (a.y - c.y) * (b.x - c.x)
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return orient2d(a, b, c) > 0.0
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class Trapezoid(object):
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@ -209,7 +189,6 @@ def line_intersect(edge, x):
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class Triangulator(object):
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def __init__(self, poly_line):
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assert len(poly_line) > 3, "Number of points must be > 3"
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self.polygons = []
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self.trapezoids = []
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self.xmono_poly = []
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@ -498,7 +477,7 @@ class YNode(Node):
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return self.rchild.locate(edge)
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if self.edge.is_below(edge.p):
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return self.lchild.locate(edge)
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if edge.slope < self.edge.slope:
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if self.edge.is_above(edge.q):
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return self.rchild.locate(edge)
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return self.lchild.locate(edge)
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