/// <summary>
/// gets the parameter of the closest point
/// </summary>
/// <param name="targetPoint"></param>
/// <returns></returns>
public double ClosestParameter(Point targetPoint)
{
double ret = 0;
double dist = Double.MaxValue;
int offset = 0;
PolylinePoint pp = StartPoint;
while (pp.Next != null)
{
var ls = new LineSegment(pp.Point, pp.Next.Point);
double t = ls.ClosestParameter(targetPoint);
Point delta = ls[t] - targetPoint;
double newDist = delta * delta;
if (newDist < dist)
{
dist = newDist;
ret = t + offset;
}
pp = pp.Next;
offset++;
}
if (Closed)
{
var ls = new LineSegment(EndPoint.Point, StartPoint.Point);
double t = ls.ClosestParameter(targetPoint);
Point delta = ls[t] - targetPoint;
double newDist = delta * delta;
if (newDist < dist)
{
ret = t + offset;
}
}
return(ret);
}
