Function Painter

library/include/modules/Screen.h:249–251

            static const Pen default_key_pen;

            Painter(const ViewRect &area, const Pen &pen = default_pen, const Pen &kpen = default_key_pen)
                : ViewRect(area), gcursor(area.view.first), cur_pen(pen), cur_key_pen(kpen)
            {}

            df::coord2d cursor() const { return local(gcursor); }
            int cursorX() const { return gcursor.x - view.first.x; }