public static float Bezier3_X2Y(float x, PVector2 p0, PVector2 p1, PVector2 p2, PVector2 p3, int maxSample, float tolerance)
{
x = PMath.Clamp(x);
float lower = 0f;
float upper = 1f;
float mid = (upper + lower) * 0.5f;
PVector2 result = Bezier3(mid, p0, p1, p2, p3);
for (int sampleI = 0; sampleI < maxSample; ++sampleI)
{
if (Math.Abs(x - result.x) <= tolerance)
{
break;
}
if (x > result.x)
{
lower = mid;
}
else
{
upper = mid;
}
mid = (upper + lower) * 0.5f;
result = Bezier3(mid, p0, p1, p2, p3);
}
return(result.y);
}
public static PVector2 Bezier3(float t, PVector2 p0, PVector2 p1, PVector2 p2, PVector2 p3)
{
float t2 = t * t;
float t3 = t2 * t;
float tInv = 1 - t;
float tInv2 = tInv * tInv;
float tInv3 = tInv2 * tInv;
PVector2 pos = tInv3 * p0;
pos += 3 * tInv2 * t * p1;
pos += 3 * tInv * t2 * p2;
pos += t3 * p3;
return(pos);
}
public static PVector2 Clamp01(PVector2 value)
{
return(Clamp(value));
}
public static PVector2 Clamp(PVector2 value, float min = 0f, float max = 1f)
{
return(new PVector2(Clamp(value.x, min, max), Clamp(value.y, min, max)));
}