3rd-party/poly2tri
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zzzzrrr 2009-12-02 16:41:52 -05:00
commit 2c67b8cf39
1 changed files with 3 additions and 24 deletions
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27
python/framework/seidel.pxi
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@ -104,37 +104,17 @@ class Edge(object):
self.mpoints.append(p) self.mpoints.append(p)
self.mpoints.append(q) self.mpoints.append(q)
##
## NOTE Rounding accuracy significantly effects numerical robustness!!!
##
def is_above(self, point): def is_above(self, point):
cdef double *a = [self.p.x, self.p.y] cdef double *a = [self.p.x, self.p.y]
cdef double *b = [self.q.x, self.q.y] cdef double *b = [self.q.x, self.q.y]
cdef double *c = [point.x, point.y] cdef double *c = [point.x, point.y]
return orient2d(a, b, c) < 0 return orient2d(a, b, c) < 0.0
def is_below(self, point): def is_below(self, point):
cdef double *a = [self.p.x, self.p.y] cdef double *a = [self.p.x, self.p.y]
cdef double *b = [self.q.x, self.q.y] cdef double *b = [self.q.x, self.q.y]
cdef double *c = [point.x, point.y] cdef double *c = [point.x, point.y]
return orient2d(a, b, c) > 0 return orient2d(a, b, c) > 0.0
def intersect(self, c, d):
a = self.p
b = self.q
a1 = self.signed_area(a, b, d)
a2 = self.signed_area(a, b, c)
if a1 != 0.0 and a2 != 0.0 and (a1 * a2) < 0.0:
a3 = self.signed_area(c, d, a)
a4 = a3 + a2 - a1
if a3 * a4 < 0.0:
t = a3 / (a3 - a4)
return a + ((b - a) * t)
return 0.0
def signed_area(self, a, b, c):
return (a.x - c.x) * (b.y - c.y) - (a.y - c.y) * (b.x - c.x)
class Trapezoid(object): class Trapezoid(object):
@ -209,7 +189,6 @@ def line_intersect(edge, x):
class Triangulator(object): class Triangulator(object):
def __init__(self, poly_line): def __init__(self, poly_line):
assert len(poly_line) > 3, "Number of points must be > 3"
self.polygons = [] self.polygons = []
self.trapezoids = [] self.trapezoids = []
self.xmono_poly = [] self.xmono_poly = []
@ -498,7 +477,7 @@ class YNode(Node):
return self.rchild.locate(edge) return self.rchild.locate(edge)
if self.edge.is_below(edge.p): if self.edge.is_below(edge.p):
return self.lchild.locate(edge) return self.lchild.locate(edge)
if edge.slope < self.edge.slope: if self.edge.is_above(edge.q):
return self.rchild.locate(edge) return self.rchild.locate(edge)
return self.lchild.locate(edge) return self.lchild.locate(edge)