user coordinate

It takes the test system of valves as a example to explain in detail on how to design and create user coordinate, trendline chart and take parameter on trendline using VB programming language.

以阀门启闭动态转矩检测系统为实例,详细介绍了用户坐标设定、采样数据趋势曲线的绘制、曲线取值等设计思想及VB编程。