Method getPixelWidth

3rdparty/qcustomplot/qcustomplot.cpp:25013–25052

! \internal This function is used to determine the width of the bar at coordinate \a key, according to the specified width (\ref setWidth) and width type (\ref setWidthType). The output parameters \a lower and \a upper return the number of pixels the bar extends to lower and higher keys, relative to the \a key coordinate (so with a non-reversed horizontal axis, \a lower is negative

  lower is negative and \a upper positive).
*/
void QCPBars::getPixelWidth(double key, double &lower, double &upper) const
{
  lower = 0;
  upper = 0;
  switch (mWidthType)
  {
    case wtAbsolute:
    {
      upper = mWidth*0.5*mKeyAxis.data()->pixelOrientation();
      lower = -upper;
      break;
    }
    case wtAxisRectRatio:
    {
      if (mKeyAxis && mKeyAxis.data()->axisRect())
      {
        if (mKeyAxis.data()->orientation() == Qt::Horizontal)
          upper = mKeyAxis.data()->axisRect()->width()*mWidth*0.5*mKeyAxis.data()->pixelOrientation();
        else
          upper = mKeyAxis.data()->axisRect()->height()*mWidth*0.5*mKeyAxis.data()->pixelOrientation();
        lower = -upper;
      } else
        qDebug() << Q_FUNC_INFO << "No key axis or axis rect defined";
      break;
    }
    case wtPlotCoords:
    {
      if (mKeyAxis)
      {
        double keyPixel = mKeyAxis.data()->coordToPixel(key);
        upper = mKeyAxis.data()->coordToPixel(key+mWidth*0.5)-keyPixel;
        lower = mKeyAxis.data()->coordToPixel(key-mWidth*0.5)-keyPixel;
        // no need to qSwap(lower, higher) when range reversed, because higher/lower are gained by
        // coordinate transform which includes range direction
      } else
        qDebug() << Q_FUNC_INFO << "No key axis defined";
      break;
    }
  }
}

/*! \internal