public void DrawLine(float x1, float y1, float x2, float y2, Vector3 col)
{
var colInt = col.AsUint();
x1 = (x1 * Width);
x2 = (x2 * Width);
y1 = (y1 * Heigth);
y2 = (y2 * Heigth);
if (Math.Abs(x2 - x1) > Math.Abs(y2 - y1))
{
// We loop along X
if (x2 < x1)
{
// We loop "x2 to x1"
Swapper.Swap(ref x1, ref x2);
Swapper.Swap(ref y1, ref y2);
}
else
{
// We loop "x1 to x2"
}
var y = y1;
var ky = (y2 - y1) / (x2 - x1);
for (var x = x1; x <= x2; x++)
{
SetPixel((int)x, (int)y, colInt);
y += ky;
}
}
else
{
// We loop along Y
if (y2 < y1)
{
// We loop "y2 to y1"
Swapper.Swap(ref x1, ref x2);
Swapper.Swap(ref y1, ref y2);
}
else
{
// We loop "y1 to y2"
}
var x = x1;
var kx = (x2 - x1) / (y2 - y1);
for (var y = y1; y <= y2; y++)
{
SetPixel((int)x, (int)y, colInt);
x += kx;
}
}
}
public void DrawLine(int x1, int y1, int x2, int y2, Vector3 col)
{
var colInt = col.AsUint();
if (Math.Abs(x2 - x1) > Math.Abs(y2 - y1))
{
// Loop along X
if (x2 < x1)
{
Swapper.Swap(ref x1, ref x2);
Swapper.Swap(ref y1, ref y2);
}
var y = (float)y1;
var ky = (float)(y2 - y1) / (x2 - x1);
for (var x = x1; x <= x2; x++)
{
SetPixel(x, (int)y, colInt);
y += ky;
}
}
else
{
// Loop along Y
if (y2 < y1)
{
Swapper.Swap(ref x1, ref x2);
Swapper.Swap(ref y1, ref y2);
}
var x = (float)x1;
var kx = (float)(x2 - x1) / (y2 - y1);
for (var y = y1; y <= y2; y++)
{
SetPixel((int)x, y, colInt);
x += kx;
}
}
}
public void DrawTriangle(float x1, float y1, float x2, float y2, float x3, float y3, Vector3 materialDiffuse)
{
var diffuse = materialDiffuse.AsUint();
//var t0 = new Vector3(((int)(x1 * Width)), (int)(y1 * Heigth), 0);
//var t1 = new Vector3((int)(x2 * Width), (int)(y2 * Heigth), 0);
//var t2 = new Vector3((int)(x3 * Width), (int)(y3 * Heigth), 0);
//if (t0.Y == t1.Y && t0.Y == t2.Y) return; // I dont care about degenerate triangles
//// sort the vertices, t0, t1, t2 lower−to−upper (bubblesort yay!)
//if (t0.Y > t1.Y) Swapper.Swap(ref t0, ref t1);
//if (t0.Y > t2.Y) Swapper.Swap(ref t0, ref t2);
//if (t1.Y > t2.Y) Swapper.Swap(ref t1, ref t2);
//int total_height = (int)(t2.Y - t0.Y);
//for (int y = (int)t0.Y; y <= t1.Y; y++)
//{
// int segment_height = (int)(t1.Y - t0.Y + 1);
// float alpha = (float)(y - t0.Y) / total_height;
// float beta = (float)(y - t0.Y) / segment_height; // be careful with divisions by zero
// Vector3 A = t0 + (t2 - t0) * alpha;
// Vector3 B = t0 + (t1 - t0) * beta;
// if (A.X > B.X) Swapper.Swap(ref A, ref B);
// for (int j = (int)A.X; j <= B.X; j++)
// {
// SetPixel(j, y, diffuse); // attention, due to int casts t0.y+i != A.y
// }
//}
//for (int y = (int)t1.Y; y <= t2.Y; y++)
//{
// int segment_height = (int)(t2.Y - t1.Y + 1);
// float alpha = (float)(y - t0.Y) / total_height;
// float beta = (float)(y - t1.Y) / segment_height; // be careful with divisions by zero
// Vector3 A = t0 + (t2 - t0) * alpha;
// Vector3 B = t1 + (t2 - t1) * beta;
// if (A.X > B.X) Swapper.Swap(ref A, ref B);
// for (int j = (int)A.X; j <= B.X; j++)
// {
// SetPixel(j, y, diffuse); // attention, due to int casts t0.y+i != A.y
// }
//}
//return;
x1 *= Width;
x2 *= Width;
x3 *= Width;
y1 *= Heigth;
y2 *= Heigth;
y3 *= Heigth;
// Loss of precision right away=not so good?
var y1p = (int)y1;
var y2p = (int)y2;
var y3p = (int)y3;
//var x1p = (int)(x1in * Width);
//var x2p = (int)(x2in * Width);
//var x3p = (int)(x3in * Width);
if (y2p < y1p)
{
Swapper.Swap(ref x1, ref x2);
Swapper.Swap(ref y1p, ref y2p);
}
if (y3p < y1p)
{
Swapper.Swap(ref x1, ref x3);
Swapper.Swap(ref y1p, ref y3p);
}
if (y3p < y2p)
{
Swapper.Swap(ref x2, ref x3);
Swapper.Swap(ref y2p, ref y3p);
}
//DrawLine(x1p, y1p, x2p, y2p, materialDiffuse);
//DrawLine(x2p, y2p, x3p, y3p, materialDiffuse);
//DrawLine(x3p, y3p, x1p, y1p, materialDiffuse);
//return;
//var x1p = (int)(x1 * Width);
//var x2p = (int)(x2 * Width);
//var x3p = (int)(x3 * Width);
var y12d = y2p - y1p + 1;
var y23d = y3p - y2p + 1;
var y13d = y3p - y1p + 1;
var k12 = (x2 - x1) / y12d;
var k23 = (x3 - x2) / y23d;
var k13 = (x3 - x1) / y13d;
float leftk12;
float leftk23;
float rightk12;
float rightk23;
if (k12 < k13)
{
leftk12 = k12;
leftk23 = k23;
rightk12 = k13;
rightk23 = k13;
}
else
{
leftk12 = k13;
leftk23 = k13;
rightk12 = k12;
rightk23 = k23;
}
float lx = x1;
float rx = x1;
for (var y = y1p; y <= y2p; y++)
{
for (var x = (int)lx; x <= rx; x++)
{
SetPixel(x, y, diffuse);
}
rx += rightk12;
lx += leftk12;
}
//rx = rightk12;
//lx = leftk12;
for (var y = y2p; y <= y3p; y++)
{
for (var x = (int)lx; x < rx; x++)
{
SetPixel(x, y, diffuse);
}
rx += rightk23;
lx += leftk23;
}
}