Qt Qchart绘制的曲线怎么在鼠标点击时添加2条竖分割线来选取线段

Qt Qchart绘制的曲线怎么在鼠标点击时添加2条竖分割线来选取线段

https://blog.csdn.net/hiccuphiccup/article/details/74996618

https://blog.csdn.net/Flame_alone/article/details/104193722双击QChart控件添加竖线添加数据分割节点