public static void DrawLine(float x0float, float y0float, float x1float, float y1float, float pixelSize, DelegateDDA2 del)
{
DrawLine(x0float / pixelSize, y0float / pixelSize, x1float / pixelSize, y1float / pixelSize, del);
}
/// <summary>
/// DONT FORGET TO SCALE ALL SO ONE PIXEL IS 1f
/// </summary>
public static void DrawLine(float x0float, float y0float, float x1float, float y1float, DelegateDDA2 del)
{
//UnityEngine.Debug.LogFormat("x0: {0}, y0: {1}, x1: {2}, y1: {3}", x0float, y0float, x1float, y1float);
int x0int = (int)x0float;
int y0int = (int)y0float;
int x1int = (int)x1float;
int y1int = (int)y1float;
if (x0int == x1int)
{
if (y0int == y1int) //inside one pixel
{
del(x0int, y0int);
return;
}
//along x axis
if (y0int < y1int)
{
for (int y = y0int; y < y1int + 1; y++)
{
if (del(x0int, y))
{
return;
}
}
}
else
{
for (int y = y0int; y > y1int - 1; y--)
{
if (del(x0int, y))
{
return;
}
}
}
return;
}
if (y0int == y1int) //along y axis
{
if (x0int < x1int)
{
for (int x = x0int; x < x1int + 1; x++)
{
if (del(x, y0int))
{
return;
}
}
}
else
{
for (int x = x0int; x > x1int - 1; x--)
{
if (del(x, y0int))
{
return;
}
}
}
return;
}
//some funky DDA based line rasterization
if (SomeMath.InRangeInclusive((x1float - x0float) / (y1float - y0float), -1, 1)) //y
{
float lineDirX = x1float - x0float;
float lineDirY = y1float - y0float;
float t0y, t1y;
if (x0float < x1float)
{
t0y = IntersectionY(x0int, x0float, y0float, lineDirX, lineDirY);
t1y = IntersectionY(x0int + 1, x0float, y0float, lineDirX, lineDirY);
//DrawCross(x0int, t0y, Color.red, 10f, "t0");
//DrawCross(x0int + 1, t1y, Color.green, 10f, "t1");
}
else
{
t0y = IntersectionY(x0int + 1, x0float, y0float, lineDirX, lineDirY);
t1y = IntersectionY(x0int, x0float, y0float, lineDirX, lineDirY);
//DrawCross(x0int + 1, t0y, Color.red, 10f, "t0");
//DrawCross(x0int, t1y, Color.green, 10f, "t1");
}
int xDelta = Math.Sign(x1int - x0int);
float yDelta = t1y - t0y;
float curYfloat = t0y;
if (y1float < y0float)
{
while (true)
{
curYfloat += yDelta;
for (; y0int > (int)curYfloat - 1; y0int--)
{
if (del(x0int, y0int))
{
return;
}
if (y0int == y1int)
{
del(x1int, y1int);
return;
}
}
y0int = (int)curYfloat;
x0int += xDelta;
}
}
else
{
while (true)
{
curYfloat += yDelta;
for (; y0int < (int)curYfloat + 1; y0int++)
{
if (del(x0int, y0int))
{
return;
}
if (y0int == y1int)
{
if (x0int != x1int)
{
del(x1int, y1int);
}
return;
}
}
y0int = (int)curYfloat;
x0int += xDelta;
}
}
}
else //x
{
float lineDirX = x1float - x0float;
float lineDirY = y1float - y0float;
float t0x, t1x;
if (y0float < y1float)
{
t0x = IntersectionX(y0int, x0float, y0float, lineDirX, lineDirY);
t1x = IntersectionX(y0int + 1, x0float, y0float, lineDirX, lineDirY);
//DrawCross(t0x, y0int, Color.red, 10f, "t0");
//DrawCross(t1x, y0int + 1, Color.green, 10f, "t1");
}
else
{
t1x = IntersectionX(y0int, x0float, y0float, lineDirX, lineDirY);
t0x = IntersectionX(y0int + 1, x0float, y0float, lineDirX, lineDirY);
//DrawCross(t1x, y0int, Color.green, 10f, "t1");
//DrawCross(t0x, y0int + 1, Color.red, 10f, "t0");
}
int yDelta = Math.Sign(y1int - y0int);
float xDelta = t1x - t0x;
float curXfloat = t0x;
if (x1float < x0float)
{
while (true)
{
curXfloat += xDelta;
for (; x0int > (int)curXfloat - 1; x0int--)
{
if (del(x0int, y0int))
{
return;
}
if (x0int == x1int)
{
if (y0int != y1int)
{
del(x1int, y1int);
}
return;
}
}
x0int = (int)curXfloat;
y0int += yDelta;
}
}
else
{
while (true)
{
curXfloat += xDelta;
for (; x0int < (int)curXfloat + 1; x0int++)
{
if (del(x0int, y0int))
{
return;
}
if (x0int == x1int)
{
if (y0int != y1int)
{
del(x1int, y1int);
}
return;
}
}
x0int = (int)curXfloat;
y0int += yDelta;
}
}
}
}
