public void DrawPoint(Vector a, Color color)
{
var t = SpaceToNormalized(a);
if (t.Z < -1 || t.Z > 1)
{
return;
}
var A = NormalizedToScreen(t);
if (ShouldBeDrawn(A))
{
ColorBuffer.SetPixel((int)Math.Ceiling(A.X), (int)Math.Ceiling(A.Y), color);
}
}
public void DrawTriangle(Vertex a, Vertex b, Vertex c)
{
a = SpaceToScreen(a);
b = SpaceToScreen(b);
c = SpaceToScreen(c);
if (a.Coordinate.Y > b.Coordinate.Y)
{
Swap(ref a, ref b);
}
if (a.Coordinate.Y > c.Coordinate.Y)
{
Swap(ref a, ref c);
}
if (b.Coordinate.Y > c.Coordinate.Y)
{
Swap(ref b, ref c);
}
Vertex left = new Vertex();
Vertex right = new Vertex();
Vertex point = new Vertex();
for (double y = a.Coordinate.Y; y < c.Coordinate.Y; ++y)
{
if (y < 0 || y > (Height - 1))
{
continue;
}
bool topHalf = y < b.Coordinate.Y;
var a0 = a;
var a1 = c;
Interpolate(a0, a1, (y - a0.Coordinate.Y) / (a1.Coordinate.Y - a0.Coordinate.Y), ref left);
var b0 = topHalf ? a : b;
var b1 = topHalf ? b : c;
Interpolate(b0, b1, (y - b0.Coordinate.Y) / (b1.Coordinate.Y - b0.Coordinate.Y), ref right);
if (left.Coordinate.X > right.Coordinate.X)
{
Swap(ref left, ref right);
}
for (double x = left.Coordinate.X; x < right.Coordinate.X; ++x)
{
if (x < 0 || x > (Width - 1))
{
continue;
}
Interpolate(left, right, (x - left.Coordinate.X) / (right.Coordinate.X - left.Coordinate.X), ref point);
if (point.Coordinate.Z > 1 || point.Coordinate.Z < -1)
{
continue;
}
if (point.Coordinate.Z < ZBuffer[(int)x, (int)y])
{
ZBuffer[(int)x, (int)y] = point.Coordinate.Z;
ColorBuffer.SetPixel((int)x, (int)y, point.Color);
}
}
}
}