/// <summary>
/// Draw a (filled) triangle to the framebuffer
/// </summary>
/// <remarks>http://www-users.mat.uni.torun.pl/~wrona/3d_tutor/tri_fillers.html</remarks>
/// <param name="vertices"></param>
/// <param name="color"></param>
/// <param name="fill"></param>
public void DrawTriangle(Model model, Triangle triangle)
{
Vertex[] sortedv = new Vertex[3];
triangle.Vertices.CopyTo(sortedv, 0);
Array.Sort(sortedv, delegate(Vertex v1, Vertex v2)
{
return v1.Projected.Y.CompareTo(v2.Projected.Y);
});
Vector3 a = sortedv[0].Projected;
Vector3 b = sortedv[1].Projected;
Vector3 c = sortedv[2].Projected;
double dx1 = (b.Y - a.Y > 0) ? (double)(b.X - a.X) / (double)(b.Y - a.Y) : 0;
double dx2 = (c.Y - a.Y > 0) ? (double)(c.X - a.X) / (double)(c.Y - a.Y) : 0;
double dx3 = (c.Y - b.Y > 0) ? (double)(c.X - b.X) / (double)(c.Y - b.Y) : 0;
double ex = (double)a.X;
double sx = (double)a.X;
double sy = (double)a.Y;
for (; sy <= b.Y; sy++, sx += dx1, ex += dx2)
{
DrawTriangleScanline(sx, ex, sy, model.LineColor, triangle.ShadedFillColor);
}
sx = b.X;
for (; sy <= c.Y; sy++, sx += dx3, ex += dx2)
{
DrawTriangleScanline(sx, ex, sy, model.LineColor, triangle.ShadedFillColor);
}
}
public Triangle(Vertex a, Vertex b, Vertex c)
{
Vertices = new Vertex[3] { a, b, c };
}