/*!
Rescales the key axis of the plottable so the whole plottable is visible.
See \ref rescaleAxes for detailed behaviour.
*/
void QCPAbstractPlottable::rescaleKeyAxis(bool onlyEnlarge) const
{
QCPAxis *keyAxis = mKeyAxis.data();
if (!keyAxis) { qDebug() << Q_FUNC_INFO << "invalid key axis"; return; }
SignDomain signDomain = sdBoth;
if (keyAxis->scaleType() == QCPAxis::stLogarithmic)
signDomain = (keyAxis->range().upper < 0 ? sdNegative : sdPositive);
bool foundRange;
QCPRange newRange = getKeyRange(foundRange, signDomain);
if (foundRange)
{
if (onlyEnlarge)
newRange.expand(keyAxis->range());
if (!QCPRange::validRange(newRange)) // likely due to range being zero (plottable has only constant data in this axis dimension), shift current range to at least center the plottable
{
double center = (newRange.lower+newRange.upper)*0.5; // upper and lower should be equal anyway, but just to make sure, incase validRange returned false for other reason
if (keyAxis->scaleType() == QCPAxis::stLinear)
{
newRange.lower = center-keyAxis->range().size()/2.0;
newRange.upper = center+keyAxis->range().size()/2.0;
} else // scaleType() == stLogarithmic
{
newRange.lower = center/qSqrt(keyAxis->range().upper/keyAxis->range().lower);
newRange.upper = center*qSqrt(keyAxis->range().upper/keyAxis->range().lower);
}
}
keyAxis->setRange(newRange);
}
}
