单文档绘图，点，线，矩形，椭圆，圆。 都具有橡皮筋功能，同时还包括了工具栏选择功能，以及右键功能，非常使用易懂。-Single Document mapping, point, line, rectangle, oval, round. Rubber band features are also included toolbar options, as well as the right features, is very straightforward to use.

一个简单的图形图像实例用opengl 橡皮筋画直线，-A simple example of a graphical image with a rubber band opengl draw a straight line,

实现了基本图形的橡皮条程序！可以由用户自己拖到鼠标进行基本图形的绘制！-Graphics to achieve the basic procedure of rubber! Can drag the mouse from the user' s own basic graphics rendering!

CohenSutherland直线剪裁，橡皮筋，多边形绘制-CohenSutherland straight cut, elastic band, polygon rendering