public static Delaunay Delaunay(this PlainShape shape, long maxEdge, NativeArray <IntVector> extraPoints, Allocator allocator)
{
var layout = shape.Split(maxEdge, extraPoints, Allocator.Temp);
int holesCount = shape.layouts.Length;
int totalCount = layout.pathCount + 2 * layout.extraCount + holesCount * 2 - 2;
var triangleStack = new TriangleStack(totalCount, allocator);
for (int i = 0; i < layout.indices.Length; ++i)
{
int index = layout.indices[i];
Triangulate(index, layout.links, ref triangleStack);
triangleStack.Reset();
}
var triangles = triangleStack.Convert();
var sliceBuffer = new SliceBuffer(layout.links.Length, layout.slices, Allocator.Temp);
sliceBuffer.AddConnections(triangles);
sliceBuffer.Dispose();
layout.Dispose();
Delaunay delaunay;
if (extraPoints.Length == 0 && maxEdge == 0)
{
delaunay = new Delaunay(shape.points, triangles, allocator);
}
else
{
var points = new NativeArray <IntVector>(layout.links.Length, Allocator.Temp);
for (int i = 0; i < layout.links.Length; ++i)
{
var link = layout.links[i];
points[link.vertex.index] = link.vertex.point;
}
delaunay = new Delaunay(points, triangles, allocator);
points.Dispose();
}
delaunay.Build();
return(delaunay);
}
private static void Triangulate(int index, NativeArray <Link> links, ref TriangleStack triangleStack)
{
var c = links[index];
var a0 = links[c.next];
var b0 = links[c.prev];
while (a0.self != b0.self)
{
var a1 = links[a0.next];
var b1 = links[b0.prev];
var aBit0 = a0.vertex.point.BitPack;
var aBit1 = a1.vertex.point.BitPack;
if (aBit1 < aBit0)
{
aBit1 = aBit0;
}
var bBit0 = b0.vertex.point.BitPack;
var bBit1 = b1.vertex.point.BitPack;
if (bBit1 < bBit0)
{
bBit1 = bBit0;
}
if (aBit0 <= bBit1 && bBit0 <= aBit1)
{
triangleStack.Add(c.vertex, a0.vertex, b0.vertex);
a0.prev = b0.self;
b0.next = a0.self;
links[a0.self] = a0;
links[b0.self] = b0;
if (bBit0 < aBit0)
{
c = b0;
b0 = b1;
}
else
{
c = a0;
a0 = a1;
}
}
else
{
if (aBit1 < bBit1)
{
var cx = c;
var ax0 = a0;
var ax1 = a1;
long ax1Bit;
do
{
var isCCW_or_Line = IntTriangle.IsCCW_or_Line(cx.vertex.point, ax0.vertex.point, ax1.vertex.point);
if (isCCW_or_Line)
{
triangleStack.Add(ax0.vertex, ax1.vertex, cx.vertex);
ax1.prev = cx.self;
cx.next = ax1.self;
links[cx.self] = cx;
links[ax1.self] = ax1;
if (cx.self != c.self)
{
// move back
ax0 = cx;
cx = links[cx.prev];
}
else
{
// move forward
ax0 = ax1;
ax1 = links[ax1.next];
}
}
else
{
cx = ax0;
ax0 = ax1;
ax1 = links[ax1.next];
}
ax1Bit = ax1.vertex.point.BitPack;
} while(ax1Bit < bBit0);
}
else
{
var cx = c;
var bx0 = b0;
var bx1 = b1;
long bx1Bit;
do
{
bool isCCW_or_Line = IntTriangle.IsCCW_or_Line(cx.vertex.point, bx1.vertex.point, bx0.vertex.point);
if (isCCW_or_Line)
{
triangleStack.Add(bx0.vertex, cx.vertex, bx1.vertex);
bx1.next = cx.self;
cx.prev = bx1.self;
links[cx.self] = cx;
links[bx1.self] = bx1;
if (cx.self != c.self)
{
// move back
bx0 = cx;
cx = links[cx.next];
}
else
{
// move forward
bx0 = bx1;
bx1 = links[bx0.prev];
}
}
else
{
cx = bx0;
bx0 = bx1;
bx1 = links[bx1.prev];
}
bx1Bit = bx1.vertex.point.BitPack;
} while(bx1Bit < aBit0);
}
c = links[c.self];
a0 = links[c.next];
b0 = links[c.prev];
aBit0 = a0.vertex.point.BitPack;
bBit0 = b0.vertex.point.BitPack;
triangleStack.Add(c.vertex, a0.vertex, b0.vertex);
a0.prev = b0.self;
b0.next = a0.self;
links[a0.self] = a0;
links[b0.self] = b0;
if (bBit0 < aBit0)
{
c = b0;
b0 = links[b0.prev];
}
else
{
c = a0;
a0 = links[a0.next];
}
}
} // while
}
