static public void triangle(Triangle tr, ref int[] zbuffer, Bitmap btm, Color color)
{
Vec3i t0 = tr.a, t1 = tr.b, t2 = tr.c;
float ity0 = tr.ityA, ity1 = tr.ityB, ity2 = tr.ityC;
int width = btm.Width;
int height = btm.Height;
if (t0.y == t1.y && t0.y == t2.y)
{
return;
}
if (t0.y > t1.y)
{
swap(ref t0, ref t1); swap(ref ity0, ref ity1);
}
if (t0.y > t2.y)
{
swap(ref t0, ref t2); swap(ref ity0, ref ity2);
}
if (t1.y > t2.y)
{
swap(ref t1, ref t2); swap(ref ity1, ref ity2);
}
int total_height = t2.y - t0.y;
for (int i = 0; i < total_height; i++)
{
bool second_half = i > t1.y - t0.y || t1.y == t0.y;
int segment_height = second_half ? t2.y - t1.y : t1.y - t0.y;
float alpha = (float)i / total_height;
float beta = (float)(i - (second_half ? t1.y - t0.y : 0)) / segment_height;
Vec3i A = t0 + (new Vec3f(t2 - t0)) * alpha;
Vec3i B = second_half ? t1 + new Vec3f(t2 - t1) * beta : t0 + new Vec3f(t1 - t0) * beta;
float ityA = ity0 + (ity2 - ity0) * alpha;
float ityB = second_half ? ity1 + (ity2 - ity1) * beta : ity0 + (ity1 - ity0) * beta;
if (A.x > B.x)
{
swap(ref A, ref B);
swap(ref ityA, ref ityB);
}
//for (int j = A.x; j <= B.x; j++)
//{
// float phi = B.x == A.x ? 1.0f : (float)(j - A.x) / (B.x - A.x);
// Vec3i P = new Vec3i(new Vec3f(A) + new Vec3f(B - A) * phi);
// float ityP = ityA + (ityB - ityA) * phi;
// int idx = P.x + P.y * width;
// if (P.x >= width || P.y >= height || P.x < 0 || P.y < 0) continue;
// if (zbuffer[idx] < P.z)
// {
// zbuffer[idx] = P.z;
// //image.set(P.x, P.y, TGAColor(255, 255, 255) * ityP);
// btm.SetPixel(P.x, P.y, color);
// }
//}
line(A, B, ref zbuffer, btm, color);
}
}
public virtual void DrawLines(Bitmap btm, ref int[] zbuffer)
{
for (int i = 0; i < m.Row - 1; i += 2)
{
Vec3i A = new Vec3i((int)m.matrix[i, 0], (int)m.matrix[i, 1], (int)m.matrix[i, 2]);
Vec3i B = new Vec3i((int)m.matrix[i + 1, 0], (int)m.matrix[i + 1, 1], (int)m.matrix[i + 1, 2]);
DrawMethods.line(A, B, ref zbuffer, btm, color);
}
}
public static Vec3i operator +(Vec3i a, Vec3f b)
{
Vec3i res = new Vec3i();
res.x = (int)(a.x + b.x);
res.y = (int)(a.y + b.y);
res.z = (int)(a.z + b.z);
return(res);
}
public static Vec3i operator *(Vec3i a, Vec3i b)
{
Vec3i res = new Vec3i();
res.x = a.x * b.x;
res.y = a.y * b.y;
res.z = a.z * b.z;
return(res);
}
public override void DrawLines(Bitmap btm, ref int[] zbuffer)
{
for (int i = 0; i < m.Row; i++)
{
Vec3i A = new Vec3i((int)m.matrix[i, 0], (int)m.matrix[i, 1], (int)m.matrix[i, 2]);
Vec3i B = new Vec3i((int)m.matrix[(i + 1) % m.Row, 0], (int)m.matrix[(i + 1) % m.Row, 1], (int)m.matrix[(i + 1) % m.Row, 2]);
DrawMethods.line(A, B, ref zbuffer, btm, Color.Black);
Vec3i A1 = new Vec3i((int)m1.matrix[i, 0], (int)m1.matrix[i, 1], (int)m1.matrix[i, 2]);
Vec3i B1 = new Vec3i((int)m1.matrix[(i + 1) % m.Row, 0], (int)m1.matrix[(i + 1) % m.Row, 1], (int)m1.matrix[(i + 1) % m.Row, 2]);
DrawMethods.line(A1, B1, ref zbuffer, btm, Color.Black);
}
for (int i = 0; i < m.Row; i++)
{
Vec3i A = new Vec3i((int)m.matrix[i, 0], (int)m.matrix[i, 1], (int)m.matrix[i, 2]);
Vec3i A1 = new Vec3i((int)m1.matrix[i, 0], (int)m1.matrix[i, 1], (int)m1.matrix[i, 2]);
DrawMethods.line(A, A1, ref zbuffer, btm, Color.Black);
}
}
static public void line(Vec3i A, Vec3i B, ref int[] zbuffer, Bitmap btm, Color color)
{
int width = btm.Width;
int height = btm.Height;
for (int j = A.x; j <= B.x; j++)
{
float phi = B.x == A.x ? 1.0f : (float)(j - A.x) / (B.x - A.x);
Vec3i P = new Vec3i(new Vec3f(A) + new Vec3f(B - A) * phi);
//float ityP = ityA + (ityB - ityA) * phi;
int idx = P.x + P.y * width;
if (P.x >= width || P.y >= height || P.x < 0 || P.y < 0)
{
continue;
}
if (zbuffer[idx] < P.z)
{
zbuffer[idx] = P.z;
//image.set(P.x, P.y, TGAColor(255, 255, 255) * ityP);
btm.SetPixel(P.x, P.y, color);
}
}
}
public Vec3f(Vec3i a)
{
x = a.x;
y = a.y;
z = a.z;
}
public Triangle(Vec3i va, Vec3i vb, Vec3i vc)
{
a = va;
b = vb;
c = vc;
}