+ ///
+ void draw(int x, int y, char c);
+ ///
+ void show(std::ostream & os, int offset = 0) const;
+ ///
+ int textheight() const { return ymax_; }
+ ///
+ void horizontalLine(int x, int y, int len, char c = '-');
+ ///
+ void verticalLine(int x, int y, int len, char c = '|');