基本图形函数 Init Graphics Initializes the graphics package, open the window for renderin MovePen(, y) Moves the pen to an absolute position Draws a line from current position to a relative DrawLine(dx, dy) coordinates DrawArc(r, start, sweep) Draws an arc specified by a radius and two angles GetWindow Width Returns the width of the graphics window GetWindowHeightO Returns the height of the graphics window GetcurrentXO Returns the current x-coordinate of the pen GetcurrentYo Returns the current y-coordinate of the penInitGraphics() Initializes the graphics package, open the window for rendering MovePen(x, y) Moves the pen to an absolute position DrawLine(dx, dy) Draws a line from current position to a relative coordinates DrawArc(r, start, sweep) Draws an arc specified by a radius and two angles GetWindowWidth() Returns the width of the graphics window GetWindowHeight() Returns the height of the graphics window GetCurrentX() Returns the current x-coordinate of the pen GetCurrentY() Returns the current y-coordinate of the pen