这是我用JAVA写的2D图表描制系统。能绘制各种常用的2D图形，比如正方形、长方形、圆形、椭圆、线条等等！-This is what I used to write Java 2D graphics system depiction system. Commonly used to draw various 2D graphics, such as square, rectangular, round, oval, line, etc.!