QCustomPlot Discussion and Comments

I want to create something like a cross between the horizontal center axis and the vertical center axis, with the horizontal center axis parallel to the X axis and the vertical center axis parallel to the Y axis.

The added central axis functions the same as the QCPAxis.

enum AxisType { atLeft = 0x01 ///< <tt>0x01</tt> Axis is vertical and on the left side of the axis rect
,atRight = 0x02 ///< <tt>0x02</tt> Axis is vertical and on the right side of the axis rect
,atTop = 0x04 ///< <tt>0x04</tt> Axis is horizontal and on the top side of the axis rect
,atBottom = 0x08 ///< <tt>0x08</tt> Axis is horizontal and on the bottom side of the axis rect
,atHCenter // New horizontal center side of the axis rect
,atVCenter // New vertical center side of the axis rect
};

https://www.qcustomplot.com/index.php/support/forum#
I can't do this using the above methods.

 rect->setAutoMargins(QCP::msNone);
 auto xCenter = rect->addAxis(QCPAxis::atTop);
 xCenter->setVisible(true);
 xCenter->setTickLabels(false);
 xCenter->setSubTicks(false);
 xCenter->setTickLengthIn(5);
 xCenter->setTickLengthOut(5);
 xCenter->setTickLabelPadding(0);
 xCenter->setLabelPadding(0);
 xCenter->setPadding(0);
 auto yCenter = axisRect->addAxis(QCPAxis::atLeft);
 ...
 connect(mPlot, &QCustomPlot::afterLayout, this,[&](){
 xCenter->setOffset(-(rect->bottom()-rect->top())/2 - 1);
 yCenter->setOffset(-(rect->right()-rect->left())/2 - 1);
 });

⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄
⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄
⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄
⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄
⠄⠄⠄⠄⠄⠄⠄⡏⠉⠉⠉⠉⠉⠉⠉⠉⠉⠉⠉⠉⠉⠉⠉⠉⠉⠉⠉⠉⠉⠉⠉⡏⠉⠉⠉⠉⠉⠉⠉⠉⠉⠉⠉⠉⠉⠉⠉⠉⠉⠉⠉⠉⠉⠉⡆ ⠄⠄⠄⠄⠄⠄⠄
⠄⠄⠄⠄⠄⠄⠄⡇⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⡇⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⡆⠄⠄⠄⠄⠄⠄⠄
⠄⠄⠄⠄⠄⠄⠄⡇⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠒⡗⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⡆⠄⠄⠄⠄⠄⠄⠄
⠄⠄⠄⠄⠄⠄⠄⡇⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠤⡧⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⡆⠄⠄⠄⠄⠄⠄⠄
⠄⠄⠄⠄⠄⠄⠄⡇⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⣀⣇⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⡆⠄⠄⠄⠄⠄⠄⠄
⠄⠄⠄⠄⠄⠄⠄⡧⠤⠤⠤⡧⠤⠤⠤⠤⡧⠤⠤⠤⠤⡧⠤⠤⠤⠤⡧⠤⠤⠤⠤⡧⠤⠤⠤⢼⠤⠤⠤⠤⢼⠤⠤⠤⠤⢼⠤⠤⠤⠤⢼⠤⠤⠤⡆⠄⠄⠄⠄⠄⠄⠄
⠄⠄⠄⠄⠄⠄⠄⡇⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠤⡧⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⡆⠄⠄⠄⠄⠄⠄⠄
⠄⠄⠄⠄⠄⠄⠄⡇⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⣀⣇⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⡆⠄⠄⠄⠄⠄⠄⠄
⠄⠄⠄⠄⠄⠄⠄⡇⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⡇⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⡆⠄⠄⠄⠄⠄⠄⠄
⠄⠄⠄⠄⠄⠄⠄⡇⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠉⡏⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⡆⠄⠄⠄⠄⠄⠄⠄
⠄⠄⠄⠄⠄⠄⠄⡇⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠒⡗⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⡇⠄⠄⠄⠄⠄⠄⠄
⠄⠄⠄⠄⠄⠄⠄⠓⠒⠒⠒⠒⠒⠒⠒⠒⠒⠒⠒⠒⠒⠒⠒⠒⠒⠒⠒⠒⠒⠒⠒⠓⠒⠒⠒⠒⠒⠒⠒⠒⠒⠒⠒⠒⠒⠒⠒⠒⠒⠒⠒⠒⠒⠒⠒⠄⠄⠄⠄⠄⠄⠄
⠄⠄⠄⠄⠄⠄⠄⡖⠒⠒⠒⠒⠒⠒⠒⠒⠒⠒⠒⠒⠒⠒⠒⠒⠒⠒⠒⠒⠒⠒⠒⡒⠒⠒⠒⠒⠒⠒⠒⠒⠒⠒⠒⠒⠒⠒⠒⠒⠒⠒⠒⠒⠒⠒⡆⠄⠄⠄⠄⠄⠄⠄
⠄⠄⠄⠄⠄⠄⠄⡇⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⡇⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⡇⠄⠄⠄⠄⠄⠄⠄
⠄⠄⠄⠄⠄⠄⠄⡇⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⣤⣧⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⡇⠄⠄⠄⠄⠄⠄⠄
⠄⠄⠄⠄⠄⠄⠄⡇⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⣀⣇⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⡇⠄⠄⠄⠄⠄⠄⠄
⠄⠄⠄⠄⠄⠄⠄⡇⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠉⡏⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⡇⠄⠄⠄⠄⠄⠄⠄
⠄⠄⠄⠄⠄⠄⠄⡇⠄⠄⠄⠄⠄⠄⠄⠄⢀⠄⠄⠄⠄⠄⡀⠄⠄⠄⢀⠄⠄⠄⠉⡏⠄⠄⠄⡀⠄⠄⠄⠄⡀⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⡇⠄⠄⠄⠄⠄⠄⠄
⠄⠄⠄⠄⠄⠄⠄⡗⠤⠤⠤⢼⠤⠤⠤⠤⢼⠤⠤⠤⠤⢼⠤⠤⠤⠤⢼⠤⠤⠄⠤⡟⠤⠤⠤⢼⠤⠤⠤⠤⢼⠤⠤⠤⠤⢼⠤⠤⠤⠤⢼⠤⠤⠤⡇⠄⠄⠄⠄⠄⠄⠄
⠄⠄⠄⠄⠄⠄⠄⡇⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠒⡗⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⡇⠄⠄⠄⠄⠄⠄⠄
⠄⠄⠄⠄⠄⠄⠄⡇⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠤⡧⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⡇⠄⠄⠄⠄⠄⠄⠄
⠄⠄⠄⠄⠄⠄⠄⡇⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⣀⣇⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⡇⠄⠄⠄⠄⠄⠄⠄
⠄⠄⠄⠄⠄⠄⠄⡇⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⣀⣇⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⡇⠄⠄⠄⠄⠄⠄⠄
⠄⠄⠄⠄⠄⠄⠄⣇⣀⣀⣀⣀⣀⣀⣀⣀⣀⣀⣀⣀⣀⣀⣀⣀⣀⣀⣀⣀⣀⣀⣀⣇⣀⣀⣀⣀⣀⣀⣀⣀⣀⣀⣀⣀⣀⣀⣀⣀⣀⣀⣀⣀⣀⣀⡇⠄⠄⠄⠄⠄⠄⠄
⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄
⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄⠄

I did it my way,but the method is low I feel.
if xCenter use QCPAxis ::bottom, The cross is sometimes not centered.

I still want to add enum atHCenter and atVCenter using the inheritance QCPAxis.
If you have a better way, please share everyone