用Java实现的画图面板，采用了双缓冲技术-Java achieve drawing panels, a dual buffer technology

Canvas绘图程序Java源码,Canvas绘图程序Java源码，可以用来画直线、矩形、圆角矩形、三角形、文字等，把缓冲区图像的内容绘制到画布上-Canvas drawing program source code in Java, Canvas drawing program Java source code, can be used to draw a straight line, rectangle, rounded rectangle, triangle, text, the buff