java界面化的较复杂的画图板程序，可以画矩形，圆形，画笔的大小调节-java interface of the more complex the drawing board program, you can draw a rectangle, circle, brush size adjustment

Java 实现的画板，功能复杂，各种基本功能都实现，还各种特效-Java implementation of the drawing board, and complex functions