/// <summary>
/// Get projection from certain point
/// </summary>
/// <param name="p"></param>
/// <param name="result"></param>
/// <returns></returns>
public int ProjectFrom(GeoPoint p, out GeoPoint result, out int segIdx)
{
int type = -1;
double minDist = double.PositiveInfinity;
GeoPoint tmpResult = GeoPoint.INVALID;
result = GeoPoint.INVALID;
segIdx = 0;
for (int i = 0; i < this.points.Count - 1; i++)
{
int tmpType = Polyline.ProjectFrom(points[i], points[i + 1], p, out tmpResult);
double tmpDist = GeoPoint.GetDistance2(tmpResult, p);
if (tmpDist <= minDist)
{
if (tmpType == 0 || type != 0)
{
//good projection is true or tmpType==0
type = tmpType;
minDist = tmpDist;
result = tmpResult;
segIdx = i;
}
}
//break;
}
return(type);
}
public double Dist2From(GeoPoint p, out int type)
{
GeoPoint projection;
int segIdx;
type = ProjectFrom(p, out projection, out segIdx);
return(GeoPoint.GetDistance2(projection, p));
}