java编写的一个java画图程序；工具面板--画笔，直线，圆，矩形，多边形,橡皮，清除；可以调整画笔、橡皮大小；显示画色板，调整画笔颜色；可以打开已有的图片，也可以把画的图保存起来。-java write a java drawing program　Tools panel- brushes, straight line, circle, rectangle, polygon, eraser, clear　can adjust the brush, eraser size　display painting swatches to adjust pen color　can open an existing image, but also the drawing can be saved.