Method TickIterator

src/KDChart/Cartesian/KDChartCartesianAxis.cpp:68–131

// remaining labels.

TickIterator::TickIterator(CartesianAxis *a, CartesianCoordinatePlane *plane, uint majorThinningFactor,
                           bool omitLastTick)
    : m_axis(a)
    , m_majorThinningFactor(majorThinningFactor)
    , m_majorLabelCount(0)
    , m_type(NoTick)
{
    // deal with the things that are specific to axes (like annotations), before the generic init().
    const CartesianAxis::Private *axisPriv = CartesianAxis::Private::get(a);
    XySwitch xy(axisPriv->isVertical());
    m_dimension = xy(plane->gridDimensionsList().first(), plane->gridDimensionsList().last());
    if (omitLastTick) {
        // In bar and stock charts the last X tick is a fencepost with no associated value, which is
        // convenient for grid painting. Here we have to manually exclude it to avoid overpainting.
        m_dimension.end -= m_dimension.stepWidth;
    }

    m_annotations = axisPriv->annotations;
    m_customTicks = axisPriv->customTicksPositions;

    const qreal inf = std::numeric_limits<qreal>::infinity();

    if (m_customTicks.count()) {
        std::sort(m_customTicks.begin(), m_customTicks.end());
        m_customTickIndex = 0;
        m_customTick = m_customTicks.at(m_customTickIndex);
    } else {
        m_customTickIndex = -1;
        m_customTick = inf;
    }

    if (m_majorThinningFactor > 1 && hasShorterLabels()) {
        m_manualLabelTexts = m_axis->shortLabels();
    } else {
        m_manualLabelTexts = m_axis->labels();
    }
    m_manualLabelIndex = m_manualLabelTexts.isEmpty() ? -1 : 0;

    if (!m_dimension.isCalculated) {
        // ### depending on the data, it is difficult to impossible to choose anchors (where ticks
        //     corresponding to the header labels are) on the ordinate or even the abscissa with
        //     2-dimensional data. this should be somewhat mitigated by isCalculated only being false
        //     when header data labels should work, at least that seems to be what the code that sets up
        //     the dimensions is trying to do.
        QStringList dataHeaderLabels;
        AbstractDiagram *const dia = plane->diagram();
        dataHeaderLabels = dia->itemRowLabels();
        if (!dataHeaderLabels.isEmpty()) {
            AttributesModel *model = dia->attributesModel();
            const int anchorCount = model->rowCount(QModelIndex());
            if (anchorCount == dataHeaderLabels.count()) {
                for (int i = 0; i < anchorCount; i++) {
                    // ### ordinal number as anchor point generally only works for 1-dimensional data
                    m_dataHeaderLabels.insert(qreal(i), dataHeaderLabels.at(i));
                }
            }
        }
    }