主要完成VC曲线画图，源码画的是正弦曲线，大家可以根据自己需求改变数据源画出自己需要的曲线，源码全面实用。-VC curve to complete the main draw, the picture is sinusoidal source, we can change the data source according to their needs they need to draw the curve of a comprehensive and practical source.