Method addAxis

src/qt/qcustomplot.cpp:16920–16965

! Adds a new axis to the axis rect side specified with \a type, and returns it. If \a axis is 0, a new QCPAxis instance is created internally. QCustomPlot owns the returned axis, so if you want to remove an axis, use \ref removeAxis instead of deleting it manually. You may inject QCPAxis instances (or subclasses of QCPAxis) by setting \a axis to an axis that was previously created outsi

  \see addAxes, setupFullAxesBox
*/
QCPAxis *QCPAxisRect::addAxis(QCPAxis::AxisType type, QCPAxis *axis)
{
  QCPAxis *newAxis = axis;
  if (!newAxis)
  {
    newAxis = new QCPAxis(this, type);
  } else // user provided existing axis instance, do some sanity checks
  {
    if (newAxis->axisType() != type)
    {
      qDebug() << Q_FUNC_INFO << "passed axis has different axis type than specified in type parameter";
      return 0;
    }
    if (newAxis->axisRect() != this)
    {
      qDebug() << Q_FUNC_INFO << "passed axis doesn't have this axis rect as parent axis rect";
      return 0;
    }
    if (axes().contains(newAxis))
    {
      qDebug() << Q_FUNC_INFO << "passed axis is already owned by this axis rect";
      return 0;
    }
  }
  if (mAxes[type].size() > 0) // multiple axes on one side, add half-bar axis ending to additional axes with offset
  {
    bool invert = (type == QCPAxis::atRight) || (type == QCPAxis::atBottom);
    newAxis->setLowerEnding(QCPLineEnding(QCPLineEnding::esHalfBar, 6, 10, !invert));
    newAxis->setUpperEnding(QCPLineEnding(QCPLineEnding::esHalfBar, 6, 10, invert));
  }
  mAxes[type].append(newAxis);
  
  // reset convenience axis pointers on parent QCustomPlot if they are unset:
  if (mParentPlot && mParentPlot->axisRectCount() > 0 && mParentPlot->axisRect(0) == this)
  {
    switch (type)
    {
      case QCPAxis::atBottom: { if (!mParentPlot->xAxis) mParentPlot->xAxis = newAxis; break; }
      case QCPAxis::atLeft: { if (!mParentPlot->yAxis) mParentPlot->yAxis = newAxis; break; }
      case QCPAxis::atTop: { if (!mParentPlot->xAxis2) mParentPlot->xAxis2 = newAxis; break; }
      case QCPAxis::atRight: { if (!mParentPlot->yAxis2) mParentPlot->yAxis2 = newAxis; break; }
    }
  }
  
  return newAxis;
}

/*!
  Adds a new axis with \ref addAxis to each axis rect side specified in \a types. This may be an