用OpenGL语言，输入点和点之间的连线关系，画出网状图，给图渐变着色，可选择着色，并对图进行移动翻转缩小放大，及纹理填充-With the OpenGL language, the input connection point and the relationship between the points, draw network maps, to map the gradient coloring, optional color, and reduce the enlarged map t