sclass BoxWithColor implements RenderableWithHints {

  Pt a, b;

  RGB color;

  *() {}

  *(Pt *a, Pt *b, RGB *color) {}

  *(Rect r, Color color) {

    a = pt(r.x, r.y); b = pt(r.x2(), r.y2());

    this.color = RGB(color);

  }

  *(Rect rect, int r, int g, int b) {

    this(rect, new Color(r, g, b));

  }

  public void renderOn(Graphics2D g, int w, int h) {

    int x1 = min(a.x, b.x), y1 = min(a.y, b.y);

    int x2 = max(a.x, b.x), y2 = max(a.y, b.y);

    fillRect(g, x1, y1, x2-x1+1, y2-y1+1, toColor(color));

  }

  public void renderHints(Graphics2D g, int w, int h) {

    int x1 = min(a.x, b.x), y1 = min(a.y, b.y);

    int x2 = max(a.x, b.x), y2 = max(a.y, b.y);

    drawRect(g, x1, y1, x2-x1+1, y2-y1+1, hintColor());

  }

}