public static float PointToSegment(Point p1, Segment s)
{
// this is from the web - don't ask exactly how it works!
PointF p=new PointF(p1.X, p1.Y);
Vector v = new Vector(s.P1, s.P0);
Vector w = new Vector(p, s.P0);
double c1 = w * v;
if ( c1 <= 0 )
// this handles the case when the point is
// nearer the first end point than a point on the line
return Distance(p, s.P0);
double c2 = v * v;
if ( c2 <= c1 )
// this handles the case when the point is
// nearer the second end point than a point on the line
return Distance(p, s.P1);
double b = c1 / c2;
PointF Pb= s.P0 + (v * b);
return Distance(p, Pb);
}
public static float Distance(PointF p, PointF pb)
{
Vector v=new Vector(p, pb);
return (float) Math.Sqrt(v*v);
}