JAVA画图程序,可以画直线,圆,椭圆,矩形和自由绘图-JAVA drawing program, can draw a straight line, circle, ellipse, rectangle and free drawing

利用Bresenham画圆法、中点画圆法以及椭圆生成算法在java界面绘制(Using the Bresenham circle method, the middle point drawing circle method and the ellipse generation algorithm to draw the java interface)