/// <summary>
/// Restituisce trasformazione di scala
/// </summary>
/// <param name="sx"></param>
/// <param name="sy"></param>
/// <returns></returns>
public static Transform2D Scala(double sx, double sy)
{
Transform2D tr = new Transform2D();
tr.Set(0,0,sx);
tr.Set(1,1,sy);
return tr;
}
/// <summary>
/// Rotazione attorno all'origine
/// </summary>
/// <param name="alf"></param>
/// <param name="radianti"></param>
/// <returns></returns>
public static Transform2D Rotazione(double alf, bool radianti = true)
{
Transform2D tr = new Transform2D();
if(radianti == false)
alf = alf * Math.PI/180.0;
double cosalf = Math.Cos(alf);
double sinalf = Math.Sin(alf);
tr.Set(0,0,cosalf);
tr.Set(1,1,cosalf);
tr.Set(0,1,-sinalf);
tr.Set(1,0,sinalf);
return tr;
}
/// <summary>
/// Traslazione
/// </summary>
/// <param name="x"></param>
/// <param name="y"></param>
/// <returns></returns>
public static Transform2D Traslazione(double x, double y)
{
Transform2D tr = new Transform2D();
tr.Set(0,2,x);
tr.Set(1,2,y);
return tr;
}