基于javascr ipt的图表工具，简洁方便，在客户端运行，能有效提高服务器速度-Javascr ipt-based charting tools, simple and convenient, the client is running, can effectively improve the server speed

gnuplot是一款基于linux平台下ns2的绘图工具，适合初学者绘制图表-gnuplot is a linux platform ns2 based drawing tools, charting for beginners

android java图表绘制引擎，有源码，测试通过，绘制效率挺高的-android java charting engine, there is source code, test passed, rendering efficiency pricey