简单的说，RRDtool (Round Robin Database Tool)就是一个强大的绘图的引擎，很多工具例如MRTG都可以调用rrdtool绘图。-RRDtool is the OpenSource industry standard, high performance data logging and graphing system for time series data. RRDtool can be easily integrated in shell scr ipts, pe

Cocos2d-x实现的一个绘图程序，其中采用了贝塞尔二阶曲线实现了平滑的直线的绘制。 -A draw program written by C++ using game egine Cocos2d-x.The main highlight is using besser to draw smooth line