// ProcessFigure override.
protected override void ProcessFigure(CircularList<Point> list,
Point3DCollection vertices,
Vector3DCollection normals,
Int32Collection indices,
PointCollection textures)
{
int k = Slices * list.Count;
int offset = vertices.Count;
for (int i = 0; i < list.Count; i++)
{
Point ptBefore = list[i - 1];
Point pt = list[i];
Point ptAfter = list[i + 1];
Vector v1 = pt - ptBefore;
v1.Normalize();
Vector v1Rotated = new Vector(-v1.Y, v1.X);
Vector v2 = ptAfter - pt;
v2.Normalize();
Vector v2Rotated = new Vector(-v2.Y, v2.X);
Line2D line1 = new Line2D(pt, ptBefore);
Line2D line2 = new Line2D(pt, ptAfter);
for (int slice = 0; slice < Slices; slice++)
{
// Angle ranges from 0 to 360 degrees.
double angle = slice * 2 * Math.PI / Slices;
double scale = EllipseWidth / 2 * Math.Sin(angle);
double depth = -Depth / 2 * (1 - Math.Cos(angle));
Line2D line1Shifted = line1 + scale * v1Rotated;
Line2D line2Shifted = line2 + scale * v2Rotated;
Point ptIntersect = line1Shifted * line2Shifted;
// Set vertex.
vertices.Add(new Point3D(ptIntersect.X, ptIntersect.Y, depth));
// Set texture coordinate.
textures.Add(new Point((double)i / list.Count,
Math.Sin(angle / 2)));
// Set triangle indices.
indices.Add(offset + (Slices * i + slice + 0) % k);
indices.Add(offset + (Slices * i + slice + 1) % k);
indices.Add(offset + (Slices * i + slice + 0 + Slices) % k);
indices.Add(offset + (Slices * i + slice + 0 + Slices) % k);
indices.Add(offset + (Slices * i + slice + 1) % k);
indices.Add(offset + (Slices * i + slice + 1 + Slices) % k);
}
}
}
// ProcessFigure overrride.
protected override void ProcessFigure(CircularList<Point> list,
Point3DCollection vertices,
Vector3DCollection normals,
Int32Collection indices,
PointCollection textures)
{
int offset = vertices.Count;
for (int i = 0; i <= list.Count; i++)
{
Point ptBefore = list[i - 1];
Point pt = list[i];
Point ptAfter = list[i + 1];
Vector v1 = pt - ptBefore;
v1.Normalize();
// Rotate by 90 degrees.
Vector v1Rotated = new Vector(-v1.Y, v1.X);
Vector v2 = ptAfter - pt;
v2.Normalize();
Vector v2Rotated = new Vector(-v2.Y, v2.X);
Line2D line1 = new Line2D(pt, ptBefore);
Line2D line2 = new Line2D(pt, ptAfter);
double scale = SliverWidth / 2;
Line2D line1Shifted = line1 + scale * v1Rotated;
Line2D line2Shifted = line2 + scale * v2Rotated;
Point ptIntersect = line1Shifted * line2Shifted;
Point ptOuter = ptIntersect;
Point ptInner = pt + -(ptIntersect - pt);
// Set triangles vertices.
vertices.Add(new Point3D(ptOuter.X, ptOuter.Y, -Depth));
vertices.Add(new Point3D(ptInner.X, ptInner.Y, -Depth));
vertices.Add(new Point3D(ptOuter.X, ptOuter.Y, 0));
vertices.Add(new Point3D(ptInner.X, ptInner.Y, 0));
// Set texture coordinates.
textures.Add(new Point(ptOuter.X, ptOuter.Y));
textures.Add(new Point(ptInner.X, ptInner.Y));
textures.Add(new Point(ptOuter.X, ptOuter.Y));
textures.Add(new Point(ptInner.X, ptInner.Y));
// Set triangle indices.
if (i < list.Count)
{
// Top
indices.Add(offset + 4 * i + 0);
indices.Add(offset + 4 * i + 1);
indices.Add(offset + 4 * i + 4);
indices.Add(offset + 4 * i + 1);
indices.Add(offset + 4 * i + 5);
indices.Add(offset + 4 * i + 4);
// Bottom
indices.Add(offset + 4 * i + 2);
indices.Add(offset + 4 * i + 6);
indices.Add(offset + 4 * i + 3);
indices.Add(offset + 4 * i + 3);
indices.Add(offset + 4 * i + 6);
indices.Add(offset + 4 * i + 7);
// Outer Side
indices.Add(offset + 4 * i + 0);
indices.Add(offset + 4 * i + 2);
indices.Add(offset + 4 * i + 4);
indices.Add(offset + 4 * i + 2);
indices.Add(offset + 4 * i + 6);
indices.Add(offset + 4 * i + 4);
// Inner Side
indices.Add(offset + 4 * i + 1);
indices.Add(offset + 4 * i + 5);
indices.Add(offset + 4 * i + 3);
indices.Add(offset + 4 * i + 3);
indices.Add(offset + 4 * i + 5);
indices.Add(offset + 4 * i + 7);
}
}
}
