private static int AddCrossPoint(IndexedVerticesOffset vertexPack, Vector2[] vertices2d, VerticesOffset maskPack, Vector2[] mask2d, System.Func <UIVertex, UIVertex, UIVertex> blend)
{
var result = 0;
for (int i = 0, iMax = 3; i < iMax; ++i)
{
var iNext = i + 1;
if (iMax <= iNext)
{
iNext = 0;
}
for (int k = 0, kMax = 3; k < kMax; ++k)
{
var kNext = k + 1;
if (kMax <= kNext)
{
kNext = 0;
}
var crossPoint = GetCrossPointWithoutPoint(vertexPack.vertices[vertexPack.indices[vertexPack.start + i]]
, vertexPack.vertices[vertexPack.indices[vertexPack.start + iNext]]
, maskPack.vertices[maskPack.start + k]
, maskPack.vertices[maskPack.start + kNext]
, blend
);
if (crossPoint.HasValue)
{
vertexPack.indices.Add(vertexPack.vertices.Count);
vertexPack.vertices.Add(crossPoint.Value);
++result;
}
}
}
return(result);
}
public static void Intersect(List <UIVertex> vertices, List <int> indices, List <UIVertex> mask, System.Func <UIVertex, UIVertex, UIVertex> blend)
{
var indicesOriginalCount = indices.Count;
var pertexPack = new IndexedVerticesOffset(vertices, indices);
var maskPack = new VerticesOffset(mask);
var vertices2d = new Vector2[3];
var mask2d = new Vector2[3];
for (int m = 0, mMax = maskPack.vertices.Count; m < mMax; m += 3)
{
for (int k = 0, kMax = 3; k < kMax; ++k)
{
mask2d[k] = maskPack.vertices[m + k].position;
}
maskPack.start = m;
if (!IsDegeneracy(mask2d))
{
for (int i = 0, iMax = indicesOriginalCount; i < iMax; i += 3)
{
for (int k = 0, kMax = 3; k < kMax; ++k)
{
vertices2d[k] = pertexPack.vertices[pertexPack.indices[i + k]].position;
}
if (!IsDegeneracy(vertices2d))
{
pertexPack.start = i;
MaskTriangles(pertexPack, vertices2d, maskPack, mask2d, blend);
}
}
}
}
indices.RemoveRange(0, indicesOriginalCount);
}
private static void MaskTriangles(IndexedVerticesOffset vertexPack, Vector2[] vertices2d, VerticesOffset maskPack, Vector2[] mask2d)
{
var indicesBaseCount = vertexPack.indices.Count;
var addCount = AddContainsVertex(vertexPack, vertices2d, maskPack, mask2d);
if (addCount == 3)
{
return;
}
addCount += AddContainsMask(vertexPack, vertices2d, maskPack, mask2d);
addCount += AddCrossPoint(vertexPack, vertices2d, maskPack, mask2d);
if ((3 < addCount) && (addCount <= 6))
{
var center = Vector2.zero;
foreach (var position in vertices2d)
{
center.x += position.x;
center.y += position.y;
}
center *= 1.0f / 3.0f;
vertexPack.indices.Sort(indicesBaseCount, addCount, new CounterClockWiseUIVertex(vertexPack.vertices, center));
vertexPack.indices.AddRange(k_SmallConvexHullVertexIndices[addCount - 4].Select(x => vertexPack.indices[indicesBaseCount + x]));
}
else if ((addCount == 0) || (addCount == 3))
{
return;
}
vertexPack.indices.RemoveRange(indicesBaseCount, addCount);
}
private static UIVertex PickupUIVertexFromTriangle(Vector2 pickupPosition, IndexedVerticesOffset vertexPack, Vector2[] vertices2d)
{
var inverseArea = 1.0f / GetAreaOfTriangle(vertices2d[0], vertices2d[1], vertices2d[2]);
var vertices = vertexPack.GetEnumerable();
var weights = new Array3 <float>(GetAreaOfTriangle(pickupPosition, vertices2d[1], vertices2d[2]) * inverseArea
, GetAreaOfTriangle(vertices2d[0], pickupPosition, vertices2d[2]) * inverseArea
, GetAreaOfTriangle(vertices2d[0], vertices2d[1], pickupPosition) * inverseArea
).GetEnumerable();
var result = WeightedAverage(vertices, weights);
return(result);
}
private static int AddContainsMask(IndexedVerticesOffset vertexPack, Vector2[] vertices2d, VerticesOffset maskPack, Vector2[] mask2d, System.Func <UIVertex, UIVertex, UIVertex> blend)
{
var result = 0;
for (int i = 0, iMax = 3; i < iMax; ++i)
{
if (ContainsInConvexHull(vertices2d, mask2d[i]))
{
var vertex = PickupUIVertexFromTriangle(mask2d[i], vertexPack, vertices2d);
vertexPack.indices.Add(vertexPack.vertices.Count);
vertexPack.vertices.Add(blend(vertex, maskPack.vertices[maskPack.start + i]));
++result;
}
}
return(result);
}
private static int AddContainsVertex(IndexedVerticesOffset vertexPack, Vector2[] vertices2d, VerticesOffset maskPack, Vector2[] mask2d)
{
var result = 0;
for (int i = 0, iMax = 3; i < iMax; ++i)
{
if (ContainsInConvexHull(mask2d, vertices2d[i]))
{
vertexPack.indices.Add(vertexPack.vertices.Count);
var vertex = vertexPack.vertices[vertexPack.indices[vertexPack.start + i]];
var maskVertex = PickupUIVertexFromTriangle(vertex.position, maskPack, mask2d);
vertexPack.vertices.Add(MultiplyVertexColor(vertex, maskVertex));
++result;
}
}
return(result);
}
private static void MaskTriangles(IndexedVerticesOffset vertexPack, Vector2[] vertices2d, VerticesOffset maskPack, Vector2[] mask2d, System.Func <UIVertex, UIVertex, UIVertex> blend)
{
var indicesBaseCount = vertexPack.indices.Count;
var addCount = AddContainsVertex(vertexPack, vertices2d, maskPack, mask2d, blend);
if (addCount == 3)
{
return;
}
addCount += AddContainsMask(vertexPack, vertices2d, maskPack, mask2d, blend);
addCount += AddCrossPoint(vertexPack, vertices2d, maskPack, mask2d, blend);
if (3 < addCount)
{
var center = Vector2.zero;
var positions = Enumerable.Range(indicesBaseCount, addCount)
.Select(x => (Vector2)vertexPack.vertices[vertexPack.indices[x]].position);
foreach (var position in positions)
{
center.x += position.x;
center.y += position.y;
}
center *= 1.0f / addCount;
vertexPack.indices.Sort(indicesBaseCount, addCount, new CounterClockWiseUIVertex(vertexPack.vertices, center));
for (var i = 2; i < addCount; ++i)
{
vertexPack.indices.Add(vertexPack.indices[indicesBaseCount + 0]);
vertexPack.indices.Add(vertexPack.indices[indicesBaseCount + i - 1]);
vertexPack.indices.Add(vertexPack.indices[indicesBaseCount + i]);
}
}
else if ((addCount == 0) || (addCount == 3))
{
return;
}
vertexPack.indices.RemoveRange(indicesBaseCount, addCount);
}
