public double DistancePointToVector(Point v1, Point v2)
{
Vector AB = v2 - v1;
Vector AP = this - v1;
IdaComPoint2D v12 = new IdaComPoint2D(AB.X, AB.Y);
IdaComPoint2D v1p = new IdaComPoint2D(AP.X, AP.Y);
//AB nesmi byt nulovy vektor, ten by vsak nedefinoval primku
double t = (v12 | v1p) / (v12 | v12);
// to je ten kyzeny bod na primce AB
IdaComPoint2D K = v1 + v12 * t;
double Dist = VectorLength(K, this);
//vzdalenost prominuteho bodu K na primky AB od bodu A
double Dist1 = VectorLength(K, v1);
//vzdalenost prominuteho bodu K na primky AB od bodu B
double Dist2 = VectorLength(K, v2);
//delka usecky AB
double Dist3 = VectorLength(v1, v2);
//vzdalenost vlozky od zacatku usecky
double Dist4 = VectorLength(this, v1);
//vzdalenost vlozky od konce usecky
double Dist5 = VectorLength(this, v2);
//v pripade, ze soucet Dist1+Dis2 je roven Dist3 potom bod lezi mezi
//body AB a nejkrati vzdalenost je Dist, v opacnem pripade je to jedna
//ze vzdalenosti Dist4 nebo Dist5
if ((Dist3 - Dist2 - Dist1).IsZero())
{
return(Dist);
}
else
{
if (Dist4 > Dist5)
{
return(Dist5);
}
else
{
return(Dist4);
}
}
}
/// <summary>
/// projection point to vector direction
/// </summary>
/// <param name="point">point</param>
/// <param name="nDir">direction of projection</param>
/// <returns>length of projection</returns>
public static double Projection(Point point, IdaComPoint2D nDir)
{
double projection = point | nDir;
return(projection);
}
/// <summary>
/// projection point to vector direction
/// </summary>
/// <param name="nDir">direction of projection</param>
/// <returns>length of projection</returns>
public double Projection(IdaComPoint2D nDir)
{
double projection = this | nDir;
return(projection);
}