// From hue, sat, val, alpha (double 0..1)
public static Color32 FromHSVA(double inHue, double inSaturation, double inValue, double inAlpha)
{
int h = (int)(inHue * 6);
double f = inHue * 6 - h;
double pD = inValue * (1 - inSaturation);
double qD = inValue * (1 - f * inSaturation);
double tD = inValue * (1 - (1 - f) * inSaturation);
byte alpha = (byte)(SMath.Clamp(inAlpha, 0, 1) * 255);
byte p = (byte)(SMath.Clamp(pD, 0, 1) * 255);
byte q = (byte)(SMath.Clamp(qD, 0, 1) * 255);
byte t = (byte)(SMath.Clamp(tD, 0, 1) * 255);
byte value = (byte)(SMath.Clamp(inValue, 0, 1) * 255);
switch (h % 6)
{
case 0: return(new Color32(value, t, p, alpha));
case 1: return(new Color32(q, value, p, alpha));
case 2: return(new Color32(p, value, t, alpha));
case 3: return(new Color32(p, q, value, alpha));
case 4: return(new Color32(t, p, value, alpha));
case 5: return(new Color32(value, p, q, alpha));
}
return(new Color32(0, 0, 0, 0));
}
// Get shortest distance between two lines.
// You can specify whether line A or B is a segment or "infinite" length.
// When line is restricted to a segment the closest point is clamped to the line.
// http://geomalgorithms.com/a07-_distance.html#dist3D_Segment_to_Segment
public static double LineLineDistance(Vector3 startA, Vector3 endA, Vector3 startB, Vector3 endB, bool isSegmentA, bool isSegmentB, out double t, out double s)
{
Vector3 u = endA - startA;
Vector3 v = endB - startB;
Vector3 w = startA - startB;
double a = u.Dot(u);
double b = u.Dot(v);
double c = v.Dot(v);
double d = u.Dot(w);
double e = v.Dot(w);
double D = a * c - b * b;
if (D == 0.0)
{
t = 0.0;
s = (b > c ? d / b : e / c);
}
else
{
t = (b * e - c * d) / D;
s = (a * e - b * d) / D;
}
// Clamp s and t to test segment vs segment distance
if (isSegmentA)
{
t = SMath.Clamp(t, 0.0, u.Length());
}
if (isSegmentB)
{
s = SMath.Clamp(s, 0.0, w.Length());
}
Vector3 intersectionA = startA + u * t;
Vector3 intersectionB = startB + v * s;
return((intersectionB - intersectionA).Length());
}
// From r, g, b, a (double 0..1)
public Color32(double inR, double inG, double inB, double inA)
{
components = new byte[] { (byte)(SMath.Clamp(inR, 0, 1) * 255), (byte)(SMath.Clamp(inG, 0, 1) * 255), (byte)(SMath.Clamp(inB, 0, 1) * 255), (byte)(SMath.Clamp(inA, 0, 1) * 255) };
}
// Get angle between this and 'other' vector in radians (0..2PI). 0 is {1, 0} goes clock-wise.
public double AngleTo(Vector3 other)
{
return(Math.Acos(SMath.Clamp(Dot(other), -1, 1)));
}