qcustomplot修改鼠标左键拖动框选，右键拖动平移

首先在void QCustomPlot::mousePressEvent(QMouseEvent *event)函数定义中（大约qcustomplot.cpp的15583行左右）

  if (mSelectionRect && mSelectionRectMode != QCP::srmNone)
  {
    if (mSelectionRectMode != QCP::srmZoom || qobject_cast<QCPAxisRect*>(axisRectAt(mMousePressPos))) // in zoom mode only activate selection rect if on an axis rect
      mSelectionRect->startSelection(event);
  } else{
  ...}

修改如下：

  if (event->button() == Qt::LeftButton && mSelectionRect && mSelectionRectMode != QCP::srmNone)
  {
    if (mSelectionRectMode != QCP::srmZoom || qobject_cast<QCPAxisRect*>(axisRectAt(mMousePressPos))) // in zoom mode only activate selection rect if on an axis rect
      mSelectionRect->startSelection(event);
  } else if(event->button() != Qt::LeftButton){
  ...}

然后在void QCPAxisRect::mousePressEvent(QMouseEvent *event, const QVariant &details)中
将（约在qcustomplot.cpp的18545行）

  if (event->buttons() & Qt::LefttButton)

修改为

  if (event->buttons() & Qt::RightButton)

然后得到效果如下：

qcustomplot交互