public static MathPoint Project(this IMathPoint point, IMathPoint origin, IMathVector axis)
{
var a = (IMathVector) point.Subtract(origin);
var t = a.Project(axis);
var v = (MathVector) axis.Scale(t);
return (MathPoint) origin.AddVector(v);
}
/// <summary>
/// 计算在某轴上的投影
/// </summary>
/// <param name="point"></param>
/// <param name="origin"></param>
/// <param name="axis"></param>
/// <returns></returns>
public static MathPoint Project(this IMathPoint point, IMathPoint origin, IMathVector axis)
{
var a = (IMathVector)point.Subtract(origin);
var t = a.Project(axis);
var v = (MathVector)axis.Scale(t);
return((MathPoint)origin.AddVector(v));
}
public static MathVector ScaleTs(this IMathVector a, double b)
{
return((MathVector)a.Scale(b));
}