//"Spin" = rotate around a relative center of motion :o)
//----------------------------------------------------------------
public void Spin(float radians, IVector3H1 axisUnitVector, IVector3H1 RelCenter)
{
Matrix3H4 Trans1 = new Matrix3H4();
Trans1.SetTranslate(-(Vector3H1)RelCenter); //translate relative center to oragine
Matrix3H4 RotateMat = new Matrix3H4();
RotateMat.RotateAnyAxis(radians, axisUnitVector); //Do 3D rotation
Matrix3H4 Trans2 = new Matrix3H4();
Trans2.SetTranslate(RelCenter); // put it back
IMatrix3H4 Answer = Trans2 * RotateMat * Trans1; //multiply out answer
this.Copy(Answer);
}
//"stretch" = scale around a relative (quasi-center) point
//basically you move to the origin, do a normal scale, then move the object back
public void Stretch(float SX, float SY, float SZ, IVector3H1 RelCenter) //probably cannot be done in 3x3... 3H4???
{
//translate relative center to oragine
Matrix3H4 Trans1 = new Matrix3H4();
Trans1.SetTranslate(-RelCenter.X, -RelCenter.Y, -RelCenter.Z);
//do the scaling
Matrix3H4 ScaleMat = new Matrix3H4();
ScaleMat.SetScale(SX, SY, SZ);
// put it back
Matrix3H4 Trans2 = new Matrix3H4();
Trans2.SetTranslate(RelCenter);
IMatrix3H4 Answer = Trans2 * ScaleMat * Trans1;
this.Copy(Answer);
}
public Matrix3H4(IMatrix3H4 OtherMatrix) //copy constructor
{
Data = new float[3, 4];
this.Copy(OtherMatrix);
}
