NewTOAPIA.Graphics.Perspective.multiply C# (CSharp) Method

        public Perspective multiply(Affine a)
        {
            Perspective b = new Perspective(this);
            sx = a.sx * b.sx + a.shx * b.shy + a.tx * b.w0;
            shx = a.sx * b.shx + a.shx * b.sy + a.tx * b.w1;
            tx = a.sx * b.tx + a.shx * b.ty + a.tx * b.w2;
            shy = a.shy * b.sx + a.sy * b.shy + a.ty * b.w0;
            sy = a.shy * b.shx + a.sy * b.sy + a.ty * b.w1;
            ty = a.shy * b.tx + a.sy * b.ty + a.ty * b.w2;
            return this;
        }

 // Multiply inverse of "m" by "this" and assign the result to "this"
 public Perspective premultiply_inv(Affine m)
 {
     Perspective t = new Perspective(m);
     t.invert();
     Set(t.multiply(this));
     return this;
 }