绘制一个实时曲线图，可以实现坐标轴以及曲线随着数据的增加而移动。图表控件上输出了50个点连成的曲线,曲线动起来，将左侧的点存在，右侧增加一些新的点.曲线整个压缩。-Draw a real-time graph, axis and the curve can be achieved with the increase of mobile data. Chart control on the output of a 50-point connected into the curves, move,