class MyPoint{
    float x,y,z; //a 3D coordinate
    MyPoint(float xin, float yin, float zin){
      x = xin;
      y = yin;
      z = zin;
    }
  void rotatez (float angle, MyPoint ref) {
      float cosa, sina;
      cosa =   cos(angle);
      sina =   sin(angle);
      //Rotates point around z-axis
      float newx =  (x-ref.x) * cosa - (y-ref.y) * sina + ref.x;
      float newy =  (y-ref.y) * cosa + (x-ref.x) * sina + ref.y;
      x = newx;
      y = newy;
    }
  
    void rotatex (float angle, MyPoint ref) {
      float cosa, sina;
      cosa =   cos(angle);
      sina =   sin(angle);
      //Rotates point around x-axis
      float newx =  (x-ref.x) * cosa + (z-ref.z) * sina + ref.x;
      float newz =  (z-ref.z) * cosa - (x-ref.x) * sina + ref.z;
      x = newx;
      z = newz;
    }
  
    void rotatey (float angle, MyPoint ref) {
      float cosa, sina;
      cosa =   cos(angle);
      sina =   sin(angle);
      //Rotates point around y-axis
      float newy =   (y-ref.y) * cosa + (z-ref.z) * sina + ref.y;
      float newz =   (z-ref.z) * cosa - (y-ref.y) * sina + ref.z;
      y = newy;
      z = newz;
    }
  
    void scale (float sx, float sy, float sz, MyPoint ref) {
      x = (x-ref.x)*sx + ref.x;
      y = (y-ref.y)*sy + ref.y;
      z = (z-ref.z)*sz + ref.z;
    }
  
    void move(float xoff, float yoff, float zoff){
      x += xoff;
      y += yoff;
      z += zoff;
    }
  
  }