本程序给出了实现内存绘图的功能源码，能够防止绘图时候内存泄露和屏幕闪烁，同时能够从文本文件中读取数据以用来绘图-This procedure gives realize the function of graphics memory source, to prevent memory leak when drawing and screen flicker, at the same time be able to read from the text file data to be used g