能够完成画直线，椭圆，园，多边形等 还能够选择线型，颜色-Able to complete painting a straight line, oval, round, polygon, etc. can also choose line color

通过输入准确的坐标实现画线的功能,并实现绘制多边形的功能。-Achieved by entering the exact coordinates of the line drawing functions，And to achieve the function of drawing polygons