橡皮筋技术，OPENGL程序，运行后可以按鼠标左键任意滑动画出一个矩形，点击鼠标右键，矩形消失-Rubber band technology, OPENGL program, press the left mouse button after running any slide to draw a rectangle, click the right mouse button, the rectangle disappears

利用OpenGL实现折线和矩形的橡皮筋技术-OpenGL implementation using rectangular rubber band line and technical

在OpenGL中利用键盘实现橡皮筋技术，先确定一个点，再确定另一个点。-Use the keyboard rubber band technology, to determine a point, and then determine another point in OpenGL.

橡皮筋技术带右键菜单功能，实现直线和矩形的橡皮筋技术，并采用右键菜单功能选择-Right-click menu functions with a rubber band technology, to achieve a straight line and rectangle rubber band technology, and feature selection using right-click menu