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Diffstat (limited to 'src/charts/axis/categoryaxis/chartcategoryaxisy.cpp')
-rw-r--r-- | src/charts/axis/categoryaxis/chartcategoryaxisy.cpp | 119 |
1 files changed, 119 insertions, 0 deletions
diff --git a/src/charts/axis/categoryaxis/chartcategoryaxisy.cpp b/src/charts/axis/categoryaxis/chartcategoryaxisy.cpp new file mode 100644 index 00000000..7d5ba103 --- /dev/null +++ b/src/charts/axis/categoryaxis/chartcategoryaxisy.cpp @@ -0,0 +1,119 @@ +/**************************************************************************** +** +** 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 "chartcategoryaxisy_p.h" +#include "qcategoryaxis.h" +#include "qabstractaxis.h" +#include "chartpresenter_p.h" +#include "abstractchartlayout_p.h" +#include <QGraphicsLayout> +#include <qmath.h> +#include <QDebug> + +QT_CHARTS_BEGIN_NAMESPACE + +ChartCategoryAxisY::ChartCategoryAxisY(QCategoryAxis *axis, QGraphicsItem* item) + : VerticalAxis(axis, item, true), + m_axis(axis) +{ + QObject::connect(axis, SIGNAL(categoriesChanged()), this, SLOT(handleCategoriesChanged())); +} + +ChartCategoryAxisY::~ChartCategoryAxisY() +{ +} + +QVector<qreal> ChartCategoryAxisY::calculateLayout() const +{ + int tickCount = m_axis->categoriesLabels().count() + 1; + QVector<qreal> points; + + if (tickCount < 2) + return points; + + const QRectF &gridRect = gridGeometry(); + qreal range = max() - min(); + if (range > 0) { + points.resize(tickCount); + qreal scale = gridRect.height() / range; + for (int i = 0; i < tickCount; ++i) { + if (i < tickCount - 1) { + qreal y = -(m_axis->startValue(m_axis->categoriesLabels().at(i)) - min()) * scale + gridRect.bottom(); + points[i] = y; + } else { + qreal y = -(m_axis->endValue(m_axis->categoriesLabels().at(i - 1)) - min()) * scale + gridRect.bottom(); + points[i] = y; + } + } + } + + return points; +} + +void ChartCategoryAxisY::updateGeometry() +{ + setLabels(m_axis->categoriesLabels() << QString()); + VerticalAxis::updateGeometry(); +} + +QSizeF ChartCategoryAxisY::sizeHint(Qt::SizeHint which, const QSizeF &constraint) const +{ + Q_UNUSED(constraint) + + QSizeF sh; + QSizeF base = VerticalAxis::sizeHint(which, constraint); + QStringList ticksList = m_axis->categoriesLabels(); + qreal width = 0; + qreal height = 0; // Height is irrelevant for Y axes with interval labels + + switch (which) { + case Qt::MinimumSize: { + QRectF boundingRect = ChartPresenter::textBoundingRect(axis()->labelsFont(), + QStringLiteral("..."), + axis()->labelsAngle()); + width = boundingRect.width() + labelPadding() + base.width() + 1.0; + sh = QSizeF(width, height); + break; + } + case Qt::PreferredSize: { + qreal labelWidth = 0.0; + foreach (const QString& s, ticksList) { + QRectF rect = ChartPresenter::textBoundingRect(axis()->labelsFont(), s, axis()->labelsAngle()); + labelWidth = qMax(rect.width(), labelWidth); + } + width = labelWidth + labelPadding() + base.width() + 1.0; + sh = QSizeF(width, height); + break; + } + default: + break; + } + return sh; +} + +void ChartCategoryAxisY::handleCategoriesChanged() +{ + QGraphicsLayoutItem::updateGeometry(); + presenter()->layout()->invalidate(); +} + +#include "moc_chartcategoryaxisy_p.cpp" + +QT_CHARTS_END_NAMESPACE |