// Visual representation of a rectangle that we can manipulate via gestures
    class TouchRectangle{
    public:
        TouchRectangle();
        TouchRectangle(const ofImage& image, int width);

        void SetPosition(int x, int y);
        void IncrementPosition(int dx, int dy);

        void SetScale(float scale);
        void IncrementScale(float ds);

        void Rotate(float dtheta, float rotation_center_x, float rotation_center_y);

        void Draw();
        bool Hit(int x, int y) const;

        bool AddPoint(long id);
        bool RemovePoint(long id);

    private:
        std::vector<long> owned_points;
        ofImage image;
        int width;
        float rotation;
        float scale;
        int x;
        int y;
    };