/// <summary>
/// Gives a coloring of the grid such that
/// if a point p has color k, then all points
/// p + m[ux, 0] + n[vx, vy] have the same color
/// for any integers a and b.
///
/// More information anout grid colorings:
/// http://gamelogic.co.za/2013/12/18/what-are-grid-colorings/
///
/// Since version 1.7
/// </summary>
public int __GetColor__ReferenceImplementation(int ux, int vx, int vy)
{
var u = new RectPoint(ux, 0);
var v = new RectPoint(vx, vy);
int colorCount = u.PerpDot(v);
float a = PerpDot(v) / (float)colorCount;
float b = -PerpDot(u) / (float)colorCount;
int m = Mathf.FloorToInt(a);
int n = Mathf.FloorToInt(b);
int baseVectorX = m * u.X + n * v.X;
int baseVectorY = n * u.Y + n * v.Y;
int offsetX = GLMathf.FloorMod(X - baseVectorX, ux);
int offsetY = Y - baseVectorY;
int colorIndex = Mathf.FloorToInt(offsetX + offsetY * ux);
return(colorIndex);
}
