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| ** |
| ** Copyright (C) 2016 The Qt Company Ltd. |
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| ** |
| ** This file is part of the Qt Charts module of the Qt Toolkit. |
| ** |
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| ****************************************************************************/ |
| |
| #include <QtCharts/qlogvalueaxis.h> |
| #include <QtCore/qmath.h> |
| #include <QtWidgets/qgraphicslayout.h> |
| #include <private/abstractchartlayout_p.h> |
| #include <private/chartlogvalueaxisx_p.h> |
| #include <private/chartpresenter_p.h> |
| |
| QT_CHARTS_BEGIN_NAMESPACE |
| |
| ChartLogValueAxisX::ChartLogValueAxisX(QLogValueAxis *axis, QGraphicsItem *item) |
| : HorizontalAxis(axis, item), |
| m_axis(axis) |
| { |
| QObject::connect(m_axis, SIGNAL(baseChanged(qreal)), this, SLOT(handleBaseChanged(qreal))); |
| QObject::connect(m_axis, SIGNAL(labelFormatChanged(QString)), this, SLOT(handleLabelFormatChanged(QString))); |
| } |
| |
| ChartLogValueAxisX::~ChartLogValueAxisX() |
| { |
| } |
| |
| QVector<qreal> ChartLogValueAxisX::calculateLayout() const |
| { |
| QVector<qreal> points; |
| points.resize(m_axis->tickCount()); |
| |
| const qreal logMax = std::log10(m_axis->max()) / std::log10(m_axis->base()); |
| const qreal logMin = std::log10(m_axis->min()) / std::log10(m_axis->base()); |
| const qreal leftEdge = qMin(logMin, logMax); |
| const qreal ceilEdge = qCeil(leftEdge); |
| |
| const QRectF &gridRect = gridGeometry(); |
| const qreal deltaX = gridRect.width() / qAbs(logMax - logMin); |
| for (int i = 0; i < m_axis->tickCount(); ++i) |
| points[i] = (ceilEdge + qreal(i)) * deltaX - leftEdge * deltaX + gridRect.left(); |
| |
| return points; |
| } |
| |
| void ChartLogValueAxisX::updateGeometry() |
| { |
| const QVector<qreal>& layout = ChartAxisElement::layout(); |
| setLabels(createLogValueLabels(m_axis->min(), m_axis->max(), m_axis->base(), layout.size(), m_axis->labelFormat())); |
| HorizontalAxis::updateGeometry(); |
| } |
| |
| void ChartLogValueAxisX::handleBaseChanged(qreal base) |
| { |
| Q_UNUSED(base); |
| QGraphicsLayoutItem::updateGeometry(); |
| if(presenter()) presenter()->layout()->invalidate(); |
| } |
| |
| void ChartLogValueAxisX::handleLabelFormatChanged(const QString &format) |
| { |
| Q_UNUSED(format); |
| QGraphicsLayoutItem::updateGeometry(); |
| if(presenter()) presenter()->layout()->invalidate(); |
| } |
| |
| QSizeF ChartLogValueAxisX::sizeHint(Qt::SizeHint which, const QSizeF &constraint) const |
| { |
| Q_UNUSED(constraint) |
| |
| QSizeF sh; |
| |
| QSizeF base = HorizontalAxis::sizeHint(which, constraint); |
| QStringList ticksList; |
| qreal logMax = std::log10(m_axis->max()) / std::log10(m_axis->base()); |
| qreal logMin = std::log10(m_axis->min()) / std::log10(m_axis->base()); |
| int tickCount = qAbs(qCeil(logMax) - qCeil(logMin)); |
| |
| // If the high edge sits exactly on the tick value, add a tick |
| qreal highValue = logMin < logMax ? logMax : logMin; |
| if (qFuzzyCompare(highValue, qreal(qCeil(highValue)))) |
| tickCount++; |
| |
| if (m_axis->max() > m_axis->min() && tickCount > 0) |
| ticksList = createLogValueLabels(m_axis->min(), m_axis->max(), m_axis->base(), tickCount, m_axis->labelFormat()); |
| else |
| ticksList.append(QStringLiteral(" ")); |
| // Width of horizontal axis sizeHint indicates the maximum distance labels can extend past |
| // first and last ticks. Base width is irrelevant. |
| qreal width = 0; |
| qreal height = 0; |
| |
| switch (which) { |
| case Qt::MinimumSize:{ |
| QRectF boundingRect = ChartPresenter::textBoundingRect(axis()->labelsFont(), |
| QStringLiteral("..."), |
| axis()->labelsAngle()); |
| width = boundingRect.width() / 2.0; |
| height = boundingRect.height() + labelPadding() + base.height() + 1.0; |
| sh = QSizeF(width, height); |
| break; |
| } |
| case Qt::PreferredSize: { |
| qreal labelHeight = 0.0; |
| qreal firstWidth = -1.0; |
| foreach (const QString& s, ticksList) { |
| QRectF rect = ChartPresenter::textBoundingRect(axis()->labelsFont(), s, axis()->labelsAngle()); |
| labelHeight = qMax(rect.height(), labelHeight); |
| width = rect.width(); |
| if (firstWidth < 0.0) |
| firstWidth = width; |
| } |
| height = labelHeight + labelPadding() + base.height() + 1.0; |
| width = qMax(width, firstWidth) / 2.0; |
| sh = QSizeF(width, height); |
| break; |
| } |
| default: |
| break; |
| } |
| |
| return sh; |
| } |
| |
| QT_CHARTS_END_NAMESPACE |
| |
| #include "moc_chartlogvalueaxisx_p.cpp" |