mirror of https://github.com/jhasse/poly2tri.git
added triangulator class
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zzzzrrr
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commit
76a60ae144
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@ -29,6 +29,7 @@
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# NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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# SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#
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from random import shuffle
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###
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### Based on Raimund Seidel'e paper "A simple and fast incremental randomized
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@ -42,14 +43,112 @@ cdef extern from 'math.h':
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double floor(double)
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double sqrt(double)
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class Triangulator:
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def __init__(self, points):
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self.polygons = []
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self.edge_list = self.init_edges(points)
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self.trapezoids = []
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self.trapezoidal_map = TrapezoidalMap()
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boundingBox = self.trapezoidal_map.boundingBox(self.edge_list)
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self.query_graph = QueryGraph(Sink(boundingBox))
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self.xmono_poly = []
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self.process()
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def trapezoidMap(self):
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return self.trapezoidal_map.map
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# Build the trapezoidal map and query graph
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def process(self):
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for e in self.edge_list:
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traps = self.query_graph.followSegment(e)
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for t in traps:
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self.trapezoidal_map.map.remove(t)
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for t in traps:
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tlist = []
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cp = t.contains(e.p)
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cq = t.contains(e.q)
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if cp and cq:
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tlist = self.trapezoidal_map.case1(t, e)
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self.query_graph.case1(t.sink, e, tlist)
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elif cp and not cq:
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tlist = self.trapezoidal_map.case2(t, e)
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self.query_graph.case2(t.sink, e, tlist)
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elif not cp and not cq:
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tlist = self.trapezoidal_map.case3(t, e)
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self.query_graph.case3(t.sink, e, tlist)
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else:
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tlist = self.trapezoidal_map.case4(t, e)
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self.query_graph.case4(t.sink, e, tlist)
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# Add new trapezoids to map
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for t in tlist:
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self.trapezoidal_map.map.append(t)
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self.trapezoidal_map.clear()
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# Mark outside trapezoids
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for t in self.trapezoidal_map.map:
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self.mark_outside(t)
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# Collect interior trapezoids
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for t in self.trapezoidal_map.map:
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if t.inside():
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self.trapezoids.append(t)
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t.add_points()
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self.create_mountains()
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def mono_polies(self):
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polies = []
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for x in self.xmono_poly:
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polies.append(x.monoPoly)
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return polies
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def create_mountains(self):
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for s in self.edge_list:
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if len(s.mpoints) > 0:
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mountain = MonotoneMountain()
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k = merge_sort(s.mpoints)
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points = [s.p] + k + [s.q]
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for p in points:
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mountain.append(p)
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mountain.process()
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for t in mountain.triangles:
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self.polygons.append(t)
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self.xmono_poly.append(mountain)
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def mark_outside(self, t):
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if t.top is self.boundingBox.top or t.bottom is self.boundingBox.bottom:
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t.trimNeighbors()
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def init_edges(self, points):
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edges = []
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for i in range(len(points)-1):
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edges.append(Edge(points[i], points[i+1]))
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edges.append(Edge(points[0], points[-1]))
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return self.order_edges(edges)
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def order_edges(self, edges):
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segs = []
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for s in edges:
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p = self.shearTransform(s.p)
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q = self.shearTransform(s.q)
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if p.x > q.x: segs.append(Edge(q, p))
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elif p.x < q.x: segs.append(Edge(p, q))
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shuffle(segs)
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return segs
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def shearTransform(self, point):
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return Point(point.x + 1e-4 * point.y, point.y)
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cdef list merge_sort(list l):
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cdef list lleft, lright
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cdef int p1, p2, p
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if len(l)>1 :
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lleft = merge_sort(l[:len(l)/2])
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lright = merge_sort(l[len(l)/2:])
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#do merge here
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p1,p2,p = 0,0,0
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p1, p2, p = 0, 0, 0
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while p1<len(lleft) and p2<len(lright):
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if lleft[p1][0] < lright[p2][0]:
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l[p]=lleft[p1]
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@ -387,26 +486,20 @@ class Node:
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def __init__(self, left, right):
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self.left = left
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self.right = right
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if left is not None:
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left.parent_list.append(self)
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if right is not None:
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right.parent_list.append(self)
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if left is not None: left.parent_list.append(self)
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if right is not None: right.parent_list.append(self)
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def replace(self, node):
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for parent in node.parent_list:
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if parent.left is node:
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parent.left = self
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else:
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parent.right = self
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if parent.left is node: parent.left = self
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else: parent.right = self
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self.parent_list.append(parent)
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class Sink(Node):
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def __new__(cls, trapezoid):
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if trapezoid.sink is not None:
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return trapezoid.sink
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else:
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return Sink(trapezoid)
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if trapezoid.sink is not None: return trapezoid.sink
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else: return Sink(trapezoid)
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def __init__(self, trapezoid):
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Node.__init__(self, None, None)
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@ -424,10 +517,8 @@ class XNode(Node):
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self.rchild = rchild
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def locate(self, e):
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if e.p.x >= self.point.x:
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return self.right.locate(e)
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else:
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return self.left.locate(e)
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if e.p.x >= self.point.x: return self.right.locate(e)
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else: return self.left.locate(e)
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class YNode(Node):
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@ -438,15 +529,11 @@ class YNode(Node):
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self.rchild = rchild
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def locate(self, e):
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if self.edge.is_above(e.p):
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return self.right.locate(e)
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elif self.edge.is_below(e.p):
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return self.left.locate(e)
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if self.edge.is_above(e.p): return self.right.locate(e)
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elif self.edge.is_below(e.p): return self.left.locate(e)
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else:
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if e.slope < self.edge.slope:
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return self.right.locate(e)
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else:
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return self.left.locate(e)
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if e.slope < self.edge.slope: return self.right.locate(e)
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else: return self.left.locate(e)
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class QueryGraph:
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