/*!
Rescales the value axis of the plottable so the whole plottable is visible.
Returns true if the axis was actually scaled. This might not be the case if this plottable has an
invalid range, e.g. because it has no data points.
See \ref rescaleAxes for detailed behaviour.
*/
void QCPAbstractPlottable::rescaleValueAxis(bool onlyEnlarge) const
{
QCPAxis *valueAxis = mValueAxis.data();
if (!valueAxis) { qDebug() << Q_FUNC_INFO << "invalid value axis"; return; }
SignDomain signDomain = sdBoth;
if (valueAxis->scaleType() == QCPAxis::stLogarithmic)
signDomain = (valueAxis->range().upper < 0 ? sdNegative : sdPositive);
bool foundRange;
QCPRange newRange = getValueRange(foundRange, signDomain);
if (foundRange)
{
if (onlyEnlarge)
newRange.expand(valueAxis->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 (valueAxis->scaleType() == QCPAxis::stLinear)
{
newRange.lower = center-valueAxis->range().size()/2.0;
newRange.upper = center+valueAxis->range().size()/2.0;
} else // scaleType() == stLogarithmic
{
newRange.lower = center/qSqrt(valueAxis->range().upper/valueAxis->range().lower);
newRange.upper = center*qSqrt(valueAxis->range().upper/valueAxis->range().lower);
}
}
valueAxis->setRange(newRange);
}
}
/*!
Returns an expanded range that contains this and \a otherRange. It is assumed that both this
range and \a otherRange are normalized (see \ref normalize).
\see expand
*/
QCPRange QCPRange::expanded(const QCPRange &otherRange) const
{
QCPRange result = *this;
result.expand(otherRange);
return result;
}