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 to move it overturned, and texture fill