public double DistToPoint(Point2D p, out Point2D footPos)
{
double minDist = this.points.Min(x => x.DistTo(p));
Point2D minPoint = this.points.First(x => x.DistTo(p) == minDist);
if (minPoint == this.points.First())
{
LineSeg seg1 = new LineSeg(this.points[0], this.points[1]);
LineSegPointRelation relation1 = new LineSegPointRelation(seg1, p);
if (relation1.Inner)
{
footPos = relation1.Foot;
return(relation1.Dist);
}
else
{
footPos = minPoint;
return(minDist);
}
}
else if (minPoint == this.points.Last())
{
int n = this.points.Count;
LineSeg seg1 = new LineSeg(this.points[n - 2], this.points[n - 1]);
LineSegPointRelation relation1 = new LineSegPointRelation(seg1, p);
if (relation1.Inner)
{
footPos = relation1.Foot;
return(relation1.Dist);
}
else
{
footPos = minPoint;
return(minDist);
}
}
else
{
int index = this.points.IndexOf(minPoint);
LineSeg seg1 = new LineSeg(this.points[index - 1], this.points[index]);
LineSeg seg2 = new LineSeg(this.points[index + 1], this.points[index]);
LineSegPointRelation relation1 = new LineSegPointRelation(seg1, p);
LineSegPointRelation relation2 = new LineSegPointRelation(seg2, p);
if (relation1.Inner)
{
footPos = relation1.Foot;
return(relation1.Dist);
}
else if (relation2.Inner)
{
footPos = relation2.Foot;
return(relation2.Dist);
}
else
{
footPos = minPoint;
return(minDist);
}
}
}
public static double DistToPoint(this PointString poly, Vector p, out Vector footPos)
{
var points = poly.Points;
double minDist = points.Min(x => x.Dist(p));
var minPoint = points.First(x => x.Dist(p) == minDist);
if (minPoint.Equals(points.First()))
{
LineSeg seg1 = new LineSeg(points[0], points[1]);
LineSegPointRelation relation1 = new LineSegPointRelation(seg1, p);
if (relation1.Inner)
{
footPos = relation1.Foot;
return(relation1.Dist);
}
else
{
footPos = minPoint;
return(minDist);
}
}
else if (minPoint.Equals(points.Last()))
{
int n = points.Count;
LineSeg seg1 = new LineSeg(points[n - 2], points[n - 1]);
LineSegPointRelation relation1 = new LineSegPointRelation(seg1, p);
if (relation1.Inner)
{
footPos = relation1.Foot;
return(relation1.Dist);
}
else
{
footPos = minPoint;
return(minDist);
}
}
else
{
int index = points.IndexOf(minPoint);
LineSeg seg1 = new LineSeg(points[index - 1], points[index]);
LineSeg seg2 = new LineSeg(points[index + 1], points[index]);
LineSegPointRelation relation1 = new LineSegPointRelation(seg1, p);
LineSegPointRelation relation2 = new LineSegPointRelation(seg2, p);
if (relation1.Inner)
{
footPos = relation1.Foot;
return(relation1.Dist);
}
else if (relation2.Inner)
{
footPos = relation1.Foot;
return(relation2.Dist);
}
else
{
footPos = minPoint;
return(minDist);
}
}
}