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Diffstat (limited to 'src/charts/axis/logvalueaxis/chartlogvalueaxisx.cpp')
-rw-r--r-- | src/charts/axis/logvalueaxis/chartlogvalueaxisx.cpp | 139 |
1 files changed, 139 insertions, 0 deletions
diff --git a/src/charts/axis/logvalueaxis/chartlogvalueaxisx.cpp b/src/charts/axis/logvalueaxis/chartlogvalueaxisx.cpp new file mode 100644 index 00000000..6057fbb1 --- /dev/null +++ b/src/charts/axis/logvalueaxis/chartlogvalueaxisx.cpp @@ -0,0 +1,139 @@ +/**************************************************************************** +** +** Copyright (C) 2014 Digia Plc +** All rights reserved. +** For any questions to Digia, please use contact form at http://qt.digia.com +** +** This file is part of the Qt Enterprise Charts Add-on. +** +** $QT_BEGIN_LICENSE$ +** Licensees holding valid Qt Enterprise licenses may use this file in +** accordance with the Qt Enterprise License Agreement provided with the +** Software or, alternatively, in accordance with the terms contained in +** a written agreement between you and Digia. +** +** If you have questions regarding the use of this file, please use +** contact form at http://qt.digia.com +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#include "chartlogvalueaxisx_p.h" +#include "chartpresenter_p.h" +#include "qlogvalueaxis.h" +#include "abstractchartlayout_p.h" +#include <QGraphicsLayout> +#include <qmath.h> +#include <QDebug> + +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; + + qreal logMax = log10(m_axis->max()) / log10(m_axis->base()); + qreal logMin = log10(m_axis->min()) / log10(m_axis->base()); + qreal leftEdge = logMin < logMax ? logMin : logMax; + qreal ceilEdge = ceil(leftEdge); + int tickCount = qAbs(ceil(logMax) - ceil(logMin)); + + points.resize(tickCount); + const QRectF &gridRect = gridGeometry(); + const qreal deltaX = gridRect.width() / qAbs(logMax - logMin); + for (int i = 0; i < tickCount; ++i) + points[i] = (ceilEdge + qreal(i)) * deltaX - leftEdge * deltaX + gridRect.left(); + + return points; +} + +void ChartLogValueAxisX::updateGeometry() +{ + const QVector<qreal>& layout = ChartAxisElement::layout(); + if (layout.isEmpty()) + return; + 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 = log10(m_axis->max()) / log10(m_axis->base()); + qreal logMin = log10(m_axis->min()) / log10(m_axis->base()); + int tickCount = qAbs(ceil(logMax) - ceil(logMin)); + 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; +} + +#include "moc_chartlogvalueaxisx_p.cpp" + +QT_CHARTS_END_NAMESPACE |