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;
  }

}