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nathan@daedalus
2012-03-19 18:57:59 -05:00
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axios/Common/Decomposition/CDT/Delaunay/DelaunayTriangle.cs Normal file
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/* Poly2Tri
* Copyright (c) 2009-2010, Poly2Tri Contributors
* http://code.google.com/p/poly2tri/
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification,
* are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* * Neither the name of Poly2Tri nor the names of its contributors may be
* used to endorse or promote products derived from this software without specific
* prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
// Changes from the Java version
// attributification
// Future possibilities
// Flattening out the number of indirections
// Replacing arrays of 3 with fixed-length arrays?
// Replacing bool[3] with a bit array of some sort?
// Bundling everything into an AoS mess?
// Hardcode them all as ABC ?
using System;
using System.Collections.Generic;
using System.Diagnostics;
using Poly2Tri.Triangulation.Delaunay.Sweep;
using Poly2Tri.Triangulation.Util;
namespace Poly2Tri.Triangulation.Delaunay
{
public class DelaunayTriangle
{
/** Neighbor pointers */
/** Flags to determine if an edge is a Delauney edge */
public FixedBitArray3 EdgeIsConstrained;
/** Flags to determine if an edge is a Constrained edge */
public FixedBitArray3 EdgeIsDelaunay;
public FixedArray3<DelaunayTriangle> Neighbors;
/** Has this triangle been marked as an interior triangle? */
public FixedArray3<TriangulationPoint> Points;
public DelaunayTriangle(TriangulationPoint p1, TriangulationPoint p2, TriangulationPoint p3)
{
Points[0] = p1;
Points[1] = p2;
Points[2] = p3;
}
public bool IsInterior { get; set; }
public int IndexOf(TriangulationPoint p)
{
int i = Points.IndexOf(p);
if (i == -1) throw new Exception("Calling index with a point that doesn't exist in triangle");
return i;
}
//TODO: Port note - different implementation
public int IndexCW(TriangulationPoint p)
{
int index = IndexOf(p);
switch (index)
{
case 0:
return 2;
case 1:
return 0;
default:
return 1;
}
}
//TODO: Port note - different implementation
public int IndexCCW(TriangulationPoint p)
{
int index = IndexOf(p);
switch (index)
{
case 0:
return 1;
case 1:
return 2;
default:
return 0;
}
}
public bool Contains(TriangulationPoint p)
{
return (p == Points[0] || p == Points[1] || p == Points[2]);
}
public bool Contains(DTSweepConstraint e)
{
return (Contains(e.P) && Contains(e.Q));
}
public bool Contains(TriangulationPoint p, TriangulationPoint q)
{
return (Contains(p) && Contains(q));
}
/// <summary>
/// Update neighbor pointers
/// </summary>
/// <param name="p1">Point 1 of the shared edge</param>
/// <param name="p2">Point 2 of the shared edge</param>
/// <param name="t">This triangle's new neighbor</param>
private void MarkNeighbor(TriangulationPoint p1, TriangulationPoint p2, DelaunayTriangle t)
{
if ((p1 == Points[2] && p2 == Points[1]) || (p1 == Points[1] && p2 == Points[2]))
{
Neighbors[0] = t;
}
else if ((p1 == Points[0] && p2 == Points[2]) || (p1 == Points[2] && p2 == Points[0]))
{
Neighbors[1] = t;
}
else if ((p1 == Points[0] && p2 == Points[1]) || (p1 == Points[1] && p2 == Points[0]))
{
Neighbors[2] = t;
}
else
{
Debug.WriteLine("Neighbor error, please report!");
// throw new Exception("Neighbor error, please report!");
}
}
/// <summary>
/// Exhaustive search to update neighbor pointers
/// </summary>
public void MarkNeighbor(DelaunayTriangle t)
{
if (t.Contains(Points[1], Points[2]))
{
Neighbors[0] = t;
t.MarkNeighbor(Points[1], Points[2], this);
}
else if (t.Contains(Points[0], Points[2]))
{
Neighbors[1] = t;
t.MarkNeighbor(Points[0], Points[2], this);
}
else if (t.Contains(Points[0], Points[1]))
{
Neighbors[2] = t;
t.MarkNeighbor(Points[0], Points[1], this);
}
else
{
Debug.WriteLine("markNeighbor failed");
}
}
public void ClearNeighbors()
{
Neighbors[0] = Neighbors[1] = Neighbors[2] = null;
}
public void ClearNeighbor(DelaunayTriangle triangle)
{
if (Neighbors[0] == triangle)
{
Neighbors[0] = null;
}
else if (Neighbors[1] == triangle)
{
Neighbors[1] = null;
}
else
{
Neighbors[2] = null;
}
}
/**
* Clears all references to all other triangles and points
*/
public void Clear()
{
DelaunayTriangle t;
for (int i = 0; i < 3; i++)
{
t = Neighbors[i];
if (t != null)
{
t.ClearNeighbor(this);
}
}
ClearNeighbors();
Points[0] = Points[1] = Points[2] = null;
}
/// <param name="t">Opposite triangle</param>
/// <param name="p">The point in t that isn't shared between the triangles</param>
public TriangulationPoint OppositePoint(DelaunayTriangle t, TriangulationPoint p)
{
Debug.Assert(t != this, "self-pointer error");
return PointCW(t.PointCW(p));
}
public DelaunayTriangle NeighborCW(TriangulationPoint point)
{
return Neighbors[(Points.IndexOf(point) + 1)%3];
}
public DelaunayTriangle NeighborCCW(TriangulationPoint point)
{
return Neighbors[(Points.IndexOf(point) + 2)%3];
}
public DelaunayTriangle NeighborAcross(TriangulationPoint point)
{
return Neighbors[Points.IndexOf(point)];
}
public TriangulationPoint PointCCW(TriangulationPoint point)
{
return Points[(IndexOf(point) + 1)%3];
}
public TriangulationPoint PointCW(TriangulationPoint point)
{
return Points[(IndexOf(point) + 2)%3];
}
private void RotateCW()
{
var t = Points[2];
Points[2] = Points[1];
Points[1] = Points[0];
Points[0] = t;
}
/// <summary>
/// Legalize triangle by rotating clockwise around oPoint
/// </summary>
/// <param name="oPoint">The origin point to rotate around</param>
/// <param name="nPoint">???</param>
public void Legalize(TriangulationPoint oPoint, TriangulationPoint nPoint)
{
RotateCW();
Points[IndexCCW(oPoint)] = nPoint;
}
public override string ToString()
{
return Points[0] + "," + Points[1] + "," + Points[2];
}
/// <summary>
/// Finalize edge marking
/// </summary>
public void MarkNeighborEdges()
{
for (int i = 0; i < 3; i++)
if (EdgeIsConstrained[i] && Neighbors[i] != null)
{
Neighbors[i].MarkConstrainedEdge(Points[(i + 1)%3], Points[(i + 2)%3]);
}
}
public void MarkEdge(DelaunayTriangle triangle)
{
for (int i = 0; i < 3; i++)
if (EdgeIsConstrained[i])
{
triangle.MarkConstrainedEdge(Points[(i + 1)%3], Points[(i + 2)%3]);
}
}
public void MarkEdge(List<DelaunayTriangle> tList)
{
foreach (DelaunayTriangle t in tList)
for (int i = 0; i < 3; i++)
if (t.EdgeIsConstrained[i])
{
MarkConstrainedEdge(t.Points[(i + 1)%3], t.Points[(i + 2)%3]);
}
}
public void MarkConstrainedEdge(int index)
{
EdgeIsConstrained[index] = true;
}
public void MarkConstrainedEdge(DTSweepConstraint edge)
{
MarkConstrainedEdge(edge.P, edge.Q);
}
/// <summary>
/// Mark edge as constrained
/// </summary>
public void MarkConstrainedEdge(TriangulationPoint p, TriangulationPoint q)
{
int i = EdgeIndex(p, q);
if (i != -1) EdgeIsConstrained[i] = true;
}
public double Area()
{
double b = Points[0].X - Points[1].X;
double h = Points[2].Y - Points[1].Y;
return Math.Abs((b*h*0.5f));
}
public TriangulationPoint Centroid()
{
double cx = (Points[0].X + Points[1].X + Points[2].X)/3f;
double cy = (Points[0].Y + Points[1].Y + Points[2].Y)/3f;
return new TriangulationPoint(cx, cy);
}
/// <summary>
/// Get the index of the neighbor that shares this edge (or -1 if it isn't shared)
/// </summary>
/// <returns>index of the shared edge or -1 if edge isn't shared</returns>
public int EdgeIndex(TriangulationPoint p1, TriangulationPoint p2)
{
int i1 = Points.IndexOf(p1);
int i2 = Points.IndexOf(p2);
// Points of this triangle in the edge p1-p2
bool a = (i1 == 0 || i2 == 0);
bool b = (i1 == 1 || i2 == 1);
bool c = (i1 == 2 || i2 == 2);
if (b && c) return 0;
if (a && c) return 1;
if (a && b) return 2;
return -1;
}
public bool GetConstrainedEdgeCCW(TriangulationPoint p)
{
return EdgeIsConstrained[(IndexOf(p) + 2)%3];
}
public bool GetConstrainedEdgeCW(TriangulationPoint p)
{
return EdgeIsConstrained[(IndexOf(p) + 1)%3];
}
public bool GetConstrainedEdgeAcross(TriangulationPoint p)
{
return EdgeIsConstrained[IndexOf(p)];
}
public void SetConstrainedEdgeCCW(TriangulationPoint p, bool ce)
{
EdgeIsConstrained[(IndexOf(p) + 2)%3] = ce;
}
public void SetConstrainedEdgeCW(TriangulationPoint p, bool ce)
{
EdgeIsConstrained[(IndexOf(p) + 1)%3] = ce;
}
public void SetConstrainedEdgeAcross(TriangulationPoint p, bool ce)
{
EdgeIsConstrained[IndexOf(p)] = ce;
}
public bool GetDelaunayEdgeCCW(TriangulationPoint p)
{
return EdgeIsDelaunay[(IndexOf(p) + 2)%3];
}
public bool GetDelaunayEdgeCW(TriangulationPoint p)
{
return EdgeIsDelaunay[(IndexOf(p) + 1)%3];
}
public bool GetDelaunayEdgeAcross(TriangulationPoint p)
{
return EdgeIsDelaunay[IndexOf(p)];
}
public void SetDelaunayEdgeCCW(TriangulationPoint p, bool ce)
{
EdgeIsDelaunay[(IndexOf(p) + 2)%3] = ce;
}
public void SetDelaunayEdgeCW(TriangulationPoint p, bool ce)
{
EdgeIsDelaunay[(IndexOf(p) + 1)%3] = ce;
}
public void SetDelaunayEdgeAcross(TriangulationPoint p, bool ce)
{
EdgeIsDelaunay[IndexOf(p)] = ce;
}
}
}

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axios/Common/Decomposition/CDT/Delaunay/Sweep/AdvancingFront.cs Normal file
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/* Poly2Tri
* Copyright (c) 2009-2010, Poly2Tri Contributors
* http://code.google.com/p/poly2tri/
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification,
* are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* * Neither the name of Poly2Tri nor the names of its contributors may be
* used to endorse or promote products derived from this software without specific
* prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
// Changes from the Java version
// Removed BST code, but not all artifacts of it
// Future possibilities
// Eliminate Add/RemoveNode ?
// Comments comments and more comments!
using System;
using System.Text;
namespace Poly2Tri.Triangulation.Delaunay.Sweep
{
/**
* @author Thomas Åhlen (thahlen@gmail.com)
*/
public class AdvancingFront
{
public AdvancingFrontNode Head;
protected AdvancingFrontNode Search;
public AdvancingFrontNode Tail;
public AdvancingFront(AdvancingFrontNode head, AdvancingFrontNode tail)
{
Head = head;
Tail = tail;
Search = head;
AddNode(head);
AddNode(tail);
}
public void AddNode(AdvancingFrontNode node)
{
//_searchTree.put(node.key, node);
}
public void RemoveNode(AdvancingFrontNode node)
{
//_searchTree.delete( node.key );
}
public override string ToString()
{
StringBuilder sb = new StringBuilder();
AdvancingFrontNode node = Head;
while (node != Tail)
{
sb.Append(node.Point.X).Append("->");
node = node.Next;
}
sb.Append(Tail.Point.X);
return sb.ToString();
}
/// <summary>
/// MM: This seems to be used by LocateNode to guess a position in the implicit linked list of AdvancingFrontNodes near x
/// Removed an overload that depended on this being exact
/// </summary>
private AdvancingFrontNode FindSearchNode(double x)
{
// TODO: implement BST index
return Search;
}
/// <summary>
/// We use a balancing tree to locate a node smaller or equal to given key value
/// </summary>
public AdvancingFrontNode LocateNode(TriangulationPoint point)
{
return LocateNode(point.X);
}
private AdvancingFrontNode LocateNode(double x)
{
AdvancingFrontNode node = FindSearchNode(x);
if (x < node.Value)
{
while ((node = node.Prev) != null)
if (x >= node.Value)
{
Search = node;
return node;
}
}
else
{
while ((node = node.Next) != null)
if (x < node.Value)
{
Search = node.Prev;
return node.Prev;
}
}
return null;
}
/// <summary>
/// This implementation will use simple node traversal algorithm to find a point on the front
/// </summary>
public AdvancingFrontNode LocatePoint(TriangulationPoint point)
{
double px = point.X;
AdvancingFrontNode node = FindSearchNode(px);
double nx = node.Point.X;
if (px == nx)
{
if (point != node.Point)
{
// We might have two nodes with same x value for a short time
if (point == node.Prev.Point)
{
node = node.Prev;
}
else if (point == node.Next.Point)
{
node = node.Next;
}
else
{
throw new Exception("Failed to find Node for given afront point");
//node = null;
}
}
}
else if (px < nx)
{
while ((node = node.Prev) != null)
{
if (point == node.Point)
{
break;
}
}
}
else
{
while ((node = node.Next) != null)
{
if (point == node.Point)
{
break;
}
}
}
Search = node;
return node;
}
}
}

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axios/Common/Decomposition/CDT/Delaunay/Sweep/AdvancingFrontNode.cs Normal file
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/* Poly2Tri
* Copyright (c) 2009-2010, Poly2Tri Contributors
* http://code.google.com/p/poly2tri/
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification,
* are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* * Neither the name of Poly2Tri nor the names of its contributors may be
* used to endorse or promote products derived from this software without specific
* prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
// Changes from the Java version
// Removed getters
// Has* turned into attributes
// Future possibilities
// Comments!
namespace Poly2Tri.Triangulation.Delaunay.Sweep
{
public class AdvancingFrontNode
{
public AdvancingFrontNode Next;
public TriangulationPoint Point;
public AdvancingFrontNode Prev;
public DelaunayTriangle Triangle;
public double Value;
public AdvancingFrontNode(TriangulationPoint point)
{
Point = point;
Value = point.X;
}
public bool HasNext
{
get { return Next != null; }
}
public bool HasPrev
{
get { return Prev != null; }
}
}
}

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axios/Common/Decomposition/CDT/Delaunay/Sweep/DTSweep.cs Normal file
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axios/Common/Decomposition/CDT/Delaunay/Sweep/DTSweepConstraint.cs Normal file
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/* Poly2Tri
* Copyright (c) 2009-2010, Poly2Tri Contributors
* http://code.google.com/p/poly2tri/
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification,
* are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* * Neither the name of Poly2Tri nor the names of its contributors may be
* used to endorse or promote products derived from this software without specific
* prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
namespace Poly2Tri.Triangulation.Delaunay.Sweep
{
public class DTSweepConstraint : TriangulationConstraint
{
/// <summary>
/// Give two points in any order. Will always be ordered so
/// that q.y > p.y and q.x > p.x if same y value
/// </summary>
public DTSweepConstraint(TriangulationPoint p1, TriangulationPoint p2)
{
P = p1;
Q = p2;
if (p1.Y > p2.Y)
{
Q = p1;
P = p2;
}
else if (p1.Y == p2.Y)
{
if (p1.X > p2.X)
{
Q = p1;
P = p2;
}
else if (p1.X == p2.X)
{
// logger.info( "Failed to create constraint {}={}", p1, p2 );
// throw new DuplicatePointException( p1 + "=" + p2 );
// return;
}
}
Q.AddEdge(this);
}
}
}

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/* Poly2Tri
* Copyright (c) 2009-2010, Poly2Tri Contributors
* http://code.google.com/p/poly2tri/
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification,
* are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* * Neither the name of Poly2Tri nor the names of its contributors may be
* used to endorse or promote products derived from this software without specific
* prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
namespace Poly2Tri.Triangulation.Delaunay.Sweep
{
/**
*
* @author Thomas Åhlén, thahlen@gmail.com
*
*/
public class DTSweepContext : TriangulationContext
{
// Inital triangle factor, seed triangle will extend 30% of
// PointSet width to both left and right.
private const float ALPHA = 0.3f;
public DTSweepBasin Basin = new DTSweepBasin();
public DTSweepEdgeEvent EdgeEvent = new DTSweepEdgeEvent();
private DTSweepPointComparator _comparator = new DTSweepPointComparator();
public AdvancingFront aFront;
public DTSweepContext()
{
Clear();
}
public TriangulationPoint Head { get; set; }
public TriangulationPoint Tail { get; set; }
public void RemoveFromList(DelaunayTriangle triangle)
{
Triangles.Remove(triangle);
// TODO: remove all neighbor pointers to this triangle
// for( int i=0; i<3; i++ )
// {
// if( triangle.neighbors[i] != null )
// {
// triangle.neighbors[i].clearNeighbor( triangle );
// }
// }
// triangle.clearNeighbors();
}
public void MeshClean(DelaunayTriangle triangle)
{
MeshCleanReq(triangle);
}
private void MeshCleanReq(DelaunayTriangle triangle)
{
if (triangle != null && !triangle.IsInterior)
{
triangle.IsInterior = true;
Triangulatable.AddTriangle(triangle);
for (int i = 0; i < 3; i++)
{
if (!triangle.EdgeIsConstrained[i])
{
MeshCleanReq(triangle.Neighbors[i]);
}
}
}
}
public override void Clear()
{
base.Clear();
Triangles.Clear();
}
public void AddNode(AdvancingFrontNode node)
{
// Console.WriteLine( "add:" + node.key + ":" + System.identityHashCode(node.key));
// m_nodeTree.put( node.getKey(), node );
aFront.AddNode(node);
}
public void RemoveNode(AdvancingFrontNode node)
{
// Console.WriteLine( "remove:" + node.key + ":" + System.identityHashCode(node.key));
// m_nodeTree.delete( node.getKey() );
aFront.RemoveNode(node);
}
public AdvancingFrontNode LocateNode(TriangulationPoint point)
{
return aFront.LocateNode(point);
}
public void CreateAdvancingFront()
{
AdvancingFrontNode head, tail, middle;
// Initial triangle
DelaunayTriangle iTriangle = new DelaunayTriangle(Points[0], Tail, Head);
Triangles.Add(iTriangle);
head = new AdvancingFrontNode(iTriangle.Points[1]);
head.Triangle = iTriangle;
middle = new AdvancingFrontNode(iTriangle.Points[0]);
middle.Triangle = iTriangle;
tail = new AdvancingFrontNode(iTriangle.Points[2]);
aFront = new AdvancingFront(head, tail);
aFront.AddNode(middle);
// TODO: I think it would be more intuitive if head is middles next and not previous
// so swap head and tail
aFront.Head.Next = middle;
middle.Next = aFront.Tail;
middle.Prev = aFront.Head;
aFront.Tail.Prev = middle;
}
/// <summary>
/// Try to map a node to all sides of this triangle that don't have
/// a neighbor.
/// </summary>
public void MapTriangleToNodes(DelaunayTriangle t)
{
AdvancingFrontNode n;
for (int i = 0; i < 3; i++)
{
if (t.Neighbors[i] == null)
{
n = aFront.LocatePoint(t.PointCW(t.Points[i]));
if (n != null)
{
n.Triangle = t;
}
}
}
}
public override void PrepareTriangulation(Triangulatable t)
{
base.PrepareTriangulation(t);
double xmax, xmin;
double ymax, ymin;
xmax = xmin = Points[0].X;
ymax = ymin = Points[0].Y;
// Calculate bounds. Should be combined with the sorting
foreach (TriangulationPoint p in Points)
{
if (p.X > xmax)
xmax = p.X;
if (p.X < xmin)
xmin = p.X;
if (p.Y > ymax)
ymax = p.Y;
if (p.Y < ymin)
ymin = p.Y;
}
double deltaX = ALPHA*(xmax - xmin);
double deltaY = ALPHA*(ymax - ymin);
TriangulationPoint p1 = new TriangulationPoint(xmax + deltaX, ymin - deltaY);
TriangulationPoint p2 = new TriangulationPoint(xmin - deltaX, ymin - deltaY);
Head = p1;
Tail = p2;
// long time = System.nanoTime();
// Sort the points along y-axis
Points.Sort(_comparator);
// logger.info( "Triangulation setup [{}ms]", ( System.nanoTime() - time ) / 1e6 );
}
public void FinalizeTriangulation()
{
Triangulatable.AddTriangles(Triangles);
Triangles.Clear();
}
public override TriangulationConstraint NewConstraint(TriangulationPoint a, TriangulationPoint b)
{
return new DTSweepConstraint(a, b);
}
#region Nested type: DTSweepBasin
public class DTSweepBasin
{
public AdvancingFrontNode bottomNode;
public bool leftHighest;
public AdvancingFrontNode leftNode;
public AdvancingFrontNode rightNode;
public double width;
}
#endregion
#region Nested type: DTSweepEdgeEvent
public class DTSweepEdgeEvent
{
public DTSweepConstraint ConstrainedEdge;
public bool Right;
}
#endregion
}
}

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axios/Common/Decomposition/CDT/Delaunay/Sweep/DTSweepPointComparator.cs Normal file
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/* Poly2Tri
* Copyright (c) 2009-2010, Poly2Tri Contributors
* http://code.google.com/p/poly2tri/
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification,
* are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* * Neither the name of Poly2Tri nor the names of its contributors may be
* used to endorse or promote products derived from this software without specific
* prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
using System.Collections.Generic;
namespace Poly2Tri.Triangulation.Delaunay.Sweep
{
public class DTSweepPointComparator : IComparer<TriangulationPoint>
{
#region IComparer<TriangulationPoint> Members
public int Compare(TriangulationPoint p1, TriangulationPoint p2)
{
if (p1.Y < p2.Y)
{
return -1;
}
else if (p1.Y > p2.Y)
{
return 1;
}
else
{
if (p1.X < p2.X)
{
return -1;
}
else if (p1.X > p2.X)
{
return 1;
}
else
{
return 0;
}
}
}
#endregion
}
}

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axios/Common/Decomposition/CDT/Delaunay/Sweep/PointOnEdgeException.cs Normal file
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/* Poly2Tri
* Copyright (c) 2009-2010, Poly2Tri Contributors
* http://code.google.com/p/poly2tri/
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification,
* are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* * Neither the name of Poly2Tri nor the names of its contributors may be
* used to endorse or promote products derived from this software without specific
* prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
using System;
namespace Poly2Tri.Triangulation.Delaunay.Sweep
{
public class PointOnEdgeException : NotImplementedException
{
public PointOnEdgeException(string message)
: base(message)
{
}
}
}