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## igeo
Class IDelaunay2D

    java.lang.Object
      igeo.IDelaunay2D

    public class IDelaunay2D

extends java.lang.Object

Class to calculate Delaunay triangulation out of 2D points.

Author:
  Satoru Sugihara

Nested Class Summary
`static class` | `IDelaunay2D.EdgeCounter`
`static class` | `IDelaunay2D.FaceIndex`

Field Summary
`static double` | `maxDistToCheck`

Constructor Summary
`IDelaunay2D()`

Method Summary
`static boolean` | `checkDirectionOfInnerCircumcirclePoint(IVec2[] pts, IVec2[][] edgePts, int ptIdx1, int ptIdx2, int ptIdx3, int ptIdx4, int innerPtNum)`
`static boolean` | `checkDirectionOnEdgePoints(IVec2[] pts, IVec2[][] edgePts, int ptIdx1, int ptIdx2, int ptIdx3, int innerPtNum)`
`static boolean` | `checkFaceDirection(IVec2[] pts, IDelaunay2D.EdgeCounter edgeCount, int ptIdx1, int ptIdx2, int ptIdx3)`
`static void` | `checkNakedEdge(IVec2[] pts, java.util.ArrayList<IDelaunay2D.FaceIndex> faceIdx, java.util.ArrayList<IVec2[]> triangles, IDelaunay2D.EdgeCounter edgeCount)`
`static double` | `determinant(double v11, double v12, double v13, double v21, double v22, double v23, double v31, double v32, double v33)`
`static IDelaunay2D.FaceIndex` | `findTriangleIndexWithEdge(java.util.ArrayList<IDelaunay2D.FaceIndex> faceIdx, int ptIdx1, int ptIdx2)`
`static IVec2[]` | `findTriangleWithIndex(IVec2[] pts, java.util.ArrayList<IVec2[]> triangles, int index1, int index2, int index3)`
`static IVec2[]` | `getAdjacentPointsOnEdgeLoop(IVec2[][] edgePts, IVec2 pt)`
`static IVec[][]` | `getEdges(IVec[] pts)` Getting edges of 2D delaunay triangles out of array of 3D points and projection vector.
`static IVec[][]` | `getEdges(IVec[] pts, IVecI projectionDir)` Getting edges of 2D delaunay triangles out of array of 3D points and projection vector.
`static IVec2[][]` | `getEdges(IVec2[] pts)` Getting edges of delaunay triangles out of array of 2D points
`static IVecI[][]` | `getEdges(IVecI[] pts)` Getting edges of 2D delaunay triangles out of array of 3D points and projection vector.
`static IVecI[][]` | `getEdges(IVecI[] pts, IVecI projectionDir)` Getting edges of 2D delaunay triangles out of array of 3D points and projection vector.
`static IVec[][]` | `getTriangles(IVec[] pts)` Getting delaunay triangles out of array of 3D points interpreted as 2D points on XY plane.
`static IVec[][]` | `getTriangles(IVec[] pts, IVecI projectionDir)` Getting delaunay triangles out of array of 3D points interpreted as 2D points on a projected plane.
`static IVec2[][]` | `getTriangles(IVec2[] pts)` Getting delaunay triangles out of array of 2D points
`static IVec2[][]` | `getTriangles(IVec2[] innerPts, IVec2[][] edgePts)` Calculates Delaunay triangles out of array of 2D points
`static IVecI[][]` | `getTriangles(IVecI[] pts)` Getting delaunay triangles out of array of 3D points interpreted as 2D points on XY plane.
`static IVecI[][]` | `getTriangles(IVecI[] pts, IVecI projectionDir)` Getting delaunay triangles out of array of 3D points interpreted as 2D points on a projected plane.
`static boolean` | `isClockwise(IVec2 pt1, IVec2 pt2, IVec2 pt3)`
`static boolean` | `isFaceCrossing(IVec2[] pts, IDelaunay2D.EdgeCounter edgeCount, int ptIdx1, int ptIdx2, int ptIdx3)`
`static boolean` | `isFaceDirectionOnEdgeCorrect(IVec2[][] edgePts, IVec2 pt, IVec2 vertexPt1, IVec2 vertexPt2)`
`static boolean` | `isFaceDirectionOnEdgeCorrect(IVec2 edgePt1, IVec2 edgePt2, IVec2 vertexPt)`
`static boolean` | `isInsideCircumcircle(IVec2 pt, IVec2 trianglePt1, IVec2 trianglePt2, IVec2 trianglePt3)`
`static boolean` | `isPointInsideEdge(IVec2 pt, IVec2 edgePt1, IVec2 edgePt2, IVec2 edgePt3)`
`static boolean` | `isPointsIntersectiongWithEdge(IVec2 pt1, IVec2 pt2, IVec2 edgePt1, IVec2 edgePt2, IVec2 edgePt3)`
`static boolean` | `isSameTriangle(IVec2[] triangle, IVec2 pt1, IVec2 pt2, IVec2 pt3)`
`static boolean` | `isVertexOnSameSide(IVec2 edgePt1, IVec2 edgePt2, IVec2 vertexPt1, IVec2 vertexPt2)`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Field Detail

### maxDistToCheck

    public static double maxDistToCheck

Constructor Detail

### IDelaunay2D

    public IDelaunay2D()

Method Detail

### getTriangles

    public static IVec2[][] getTriangles(IVec2[] innerPts,
                                         IVec2[][] edgePts)

  Calculates Delaunay triangles out of array of 2D points

  Parameters:
    `innerPts` - points inside edges defined by edgePts
    `edgePts` - points on the edge (the edge should be naked having only one triangle touching); order of edge points needs to be counter clockwise for outer trim loop, clockwise for inner hole trim loop.
  Returns:
    array of triangles, which consist of array of 3 points of IVec2

### getTriangles

    public static IVecI[][] getTriangles(IVecI[] pts)

  Getting delaunay triangles out of array of 3D points interpreted as 2D points on XY plane.

  Returns:
    array of triangles, which consist of array of 3 points of IVec2

### getTriangles

    public static IVecI[][] getTriangles(IVecI[] pts,
                                         IVecI projectionDir)

  Getting delaunay triangles out of array of 3D points interpreted as 2D points on a projected plane.

  Returns:
    array of triangles, which consist of array of 3 points of IVec2

### getTriangles

    public static IVec[][] getTriangles(IVec[] pts)

  Getting delaunay triangles out of array of 3D points interpreted as 2D points on XY plane.

  Returns:
    array of triangles, which consist of array of 3 points of IVec2

### getTriangles

    public static IVec[][] getTriangles(IVec[] pts,
                                        IVecI projectionDir)

  Getting delaunay triangles out of array of 3D points interpreted as 2D points on a projected plane.

  Returns:
    array of triangles, which consist of array of 3 points of IVec2

### getTriangles

    public static IVec2[][] getTriangles(IVec2[] pts)

  Getting delaunay triangles out of array of 2D points

  Returns:
    array of triangles, which consist of array of 3 points of IVec2

### getEdges

    public static IVec2[][] getEdges(IVec2[] pts)

  Getting edges of delaunay triangles out of array of 2D points

  Returns:
    array of triangles, which consist of array of 3 points of IVec2

### getEdges

    public static IVecI[][] getEdges(IVecI[] pts)

  Getting edges of 2D delaunay triangles out of array of 3D points and projection vector.

  Returns:
    array of triangles, which consist of array of 3 points of IVec2

### getEdges

    public static IVecI[][] getEdges(IVecI[] pts,
                                     IVecI projectionDir)

  Getting edges of 2D delaunay triangles out of array of 3D points and projection vector.

  Returns:
    array of triangles, which consist of array of 3 points of IVec2

### getEdges

    public static IVec[][] getEdges(IVec[] pts)

  Getting edges of 2D delaunay triangles out of array of 3D points and projection vector.

  Returns:
    array of triangles, which consist of array of 3 points of IVec2

### getEdges

    public static IVec[][] getEdges(IVec[] pts,
                                    IVecI projectionDir)

  Getting edges of 2D delaunay triangles out of array of 3D points and projection vector.

  Returns:
    array of triangles, which consist of array of 3 points of IVec2

### isInsideCircumcircle

    public static boolean isInsideCircumcircle(IVec2 pt,
                                               IVec2 trianglePt1,
                                               IVec2 trianglePt2,
                                               IVec2 trianglePt3)

### isClockwise

    public static boolean isClockwise(IVec2 pt1,
                                      IVec2 pt2,
                                      IVec2 pt3)

### determinant

    public static double determinant(double v11,
                                     double v12,
                                     double v13,
                                     double v21,
                                     double v22,
                                     double v23,
                                     double v31,
                                     double v32,
                                     double v33)

### isFaceCrossing

    public static boolean isFaceCrossing(IVec2[] pts,
                                         IDelaunay2D.EdgeCounter edgeCount,
                                         int ptIdx1,
                                         int ptIdx2,
                                         int ptIdx3)

### isVertexOnSameSide

    public static boolean isVertexOnSameSide(IVec2 edgePt1,
                                             IVec2 edgePt2,
                                             IVec2 vertexPt1,
                                             IVec2 vertexPt2)

### isFaceDirectionOnEdgeCorrect

    public static boolean isFaceDirectionOnEdgeCorrect(IVec2 edgePt1,
                                                       IVec2 edgePt2,
                                                       IVec2 vertexPt)

### isFaceDirectionOnEdgeCorrect

    public static boolean isFaceDirectionOnEdgeCorrect(IVec2[][] edgePts,
                                                       IVec2 pt,
                                                       IVec2 vertexPt1,
                                                       IVec2 vertexPt2)

### isPointsIntersectiongWithEdge

    public static boolean isPointsIntersectiongWithEdge(IVec2 pt1,
                                                        IVec2 pt2,
                                                        IVec2 edgePt1,
                                                        IVec2 edgePt2,
                                                        IVec2 edgePt3)

### isPointInsideEdge

    public static boolean isPointInsideEdge(IVec2 pt,
                                            IVec2 edgePt1,
                                            IVec2 edgePt2,
                                            IVec2 edgePt3)

### checkFaceDirection

    public static boolean checkFaceDirection(IVec2[] pts,
                                             IDelaunay2D.EdgeCounter edgeCount,
                                             int ptIdx1,
                                             int ptIdx2,
                                             int ptIdx3)

### checkDirectionOnEdgePoints

    public static boolean checkDirectionOnEdgePoints(IVec2[] pts,
                                                     IVec2[][] edgePts,
                                                     int ptIdx1,
                                                     int ptIdx2,
                                                     int ptIdx3,
                                                     int innerPtNum)

### getAdjacentPointsOnEdgeLoop

    public static IVec2[] getAdjacentPointsOnEdgeLoop(IVec2[][] edgePts,
                                                      IVec2 pt)

### checkDirectionOfInnerCircumcirclePoint

    public static boolean checkDirectionOfInnerCircumcirclePoint(IVec2[] pts,
                                                                 IVec2[][] edgePts,
                                                                 int ptIdx1,
                                                                 int ptIdx2,
                                                                 int ptIdx3,
                                                                 int ptIdx4,
                                                                 int innerPtNum)

### checkNakedEdge

    public static void checkNakedEdge(IVec2[] pts,
                                      java.util.ArrayList<IDelaunay2D.FaceIndex> faceIdx,
                                      java.util.ArrayList<IVec2[]> triangles,
                                      IDelaunay2D.EdgeCounter edgeCount)

### findTriangleWithIndex

    public static IVec2[] findTriangleWithIndex(IVec2[] pts,
                                                java.util.ArrayList<IVec2[]> triangles,
                                                int index1,
                                                int index2,
                                                int index3)

### isSameTriangle

    public static boolean isSameTriangle(IVec2[] triangle,
                                         IVec2 pt1,
                                         IVec2 pt2,
                                         IVec2 pt3)

### findTriangleIndexWithEdge

    public static IDelaunay2D.FaceIndex findTriangleIndexWithEdge(java.util.ArrayList<IDelaunay2D.FaceIndex> faceIdx,
                                                                  int ptIdx1,
                                                                  int ptIdx2)

  Parameters:
    `ptIdx1` - requirement: ptIdx1 < ptIdx2

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