Method shift

src/backend/worksheet/plots/cartesian/CartesianPlot.cpp:3175–3273

! * helper function called in other shift*() functions * and doing the actual change of the data ranges. * @param x if set to \true the x-range is modified, the y-range for \c false * @param leftOrDown the "shift left" for x or "shift dows" for y is performed if set to \c \true, * "shift right" or "shift up" for \c false */

 * "shift right" or "shift up" for \c false
 */
void CartesianPlot::shift(int index, const Dimension dim, bool leftOrDown) {
	setUndoAware(false);
	enableAutoScale(dim, index, false);
	setUndoAware(true);
	Q_D(CartesianPlot);

	Range<double> range;
	if (index == -1) {
		QVector<int> shiftedIndices;
		for (int i = 0; i < m_coordinateSystems.count(); i++) {
			int idx = coordinateSystem(i)->index(dim);
			if (shiftedIndices.contains(idx))
				continue;
			shift(idx, dim, leftOrDown);
			shiftedIndices.append(idx);
		}
		return;
	}
	range = d->range(dim, index);

	double offset = 0.0, factor = 0.1;

	if (!leftOrDown)
		factor *= -1.;

	const double start{range.start()}, end{range.end()};
	switch (range.scale()) {
	case RangeT::Scale::Linear: {
		offset = range.size() * factor;
		range += offset;
		break;
	}
	case RangeT::Scale::Log10: {
		if (start == 0 || end / start <= 0)
			break;
		offset = log10(end / start) * factor;
		range *= pow(10, offset);
		break;
	}
	case RangeT::Scale::Log2: {
		if (start == 0 || end / start <= 0)
			break;
		offset = log2(end / start) * factor;
		range *= exp2(offset);
		break;
	}
	case RangeT::Scale::Ln: {
		if (start == 0 || end / start <= 0)
			break;
		offset = log(end / start) * factor;
		range *= exp(offset);
		break;
	}
	case RangeT::Scale::Sqrt:
		if (start < 0 || end < 0)
			break;
		offset = (sqrt(end) - sqrt(start)) * factor;
		range += offset * offset;