diff options
Diffstat (limited to 'src/charts/axis/valueaxis/chartvalueaxisy.cpp')
-rw-r--r-- | src/charts/axis/valueaxis/chartvalueaxisy.cpp | 130 |
1 files changed, 130 insertions, 0 deletions
diff --git a/src/charts/axis/valueaxis/chartvalueaxisy.cpp b/src/charts/axis/valueaxis/chartvalueaxisy.cpp new file mode 100644 index 00000000..d6b7c651 --- /dev/null +++ b/src/charts/axis/valueaxis/chartvalueaxisy.cpp @@ -0,0 +1,130 @@ +/**************************************************************************** +** +** 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 "chartvalueaxisy_p.h" +#include "qabstractaxis.h" +#include "chartpresenter_p.h" +#include "qvalueaxis.h" +#include "abstractchartlayout_p.h" +#include <QGraphicsLayout> +#include <qmath.h> +#include <QDebug> + +QT_CHARTS_BEGIN_NAMESPACE + +ChartValueAxisY::ChartValueAxisY(QValueAxis *axis, QGraphicsItem *item) + : VerticalAxis(axis, item), + m_axis(axis) +{ + QObject::connect(m_axis, SIGNAL(tickCountChanged(int)), this, SLOT(handleTickCountChanged(int))); + QObject::connect(m_axis, SIGNAL(labelFormatChanged(QString)), this, SLOT(handleLabelFormatChanged(QString))); +} + +ChartValueAxisY::~ChartValueAxisY() +{ +} + +QVector<qreal> ChartValueAxisY::calculateLayout() const +{ + int tickCount = m_axis->tickCount(); + + Q_ASSERT(tickCount >= 2); + + QVector<qreal> points; + points.resize(tickCount); + + const QRectF &gridRect = gridGeometry(); + + const qreal deltaY = gridRect.height() / (qreal(tickCount) - 1.0); + for (int i = 0; i < tickCount; ++i) + points[i] = qreal(i) * -deltaY + gridRect.bottom(); + + return points; +} + +void ChartValueAxisY::updateGeometry() +{ + const QVector<qreal> &layout = ChartAxisElement::layout(); + if (layout.isEmpty()) + return; + setLabels(createValueLabels(min(),max(),layout.size(),m_axis->labelFormat())); + VerticalAxis::updateGeometry(); +} + +void ChartValueAxisY::handleTickCountChanged(int tick) +{ + Q_UNUSED(tick); + QGraphicsLayoutItem::updateGeometry(); + if (presenter()) presenter()->layout()->invalidate(); +} + +void ChartValueAxisY::handleLabelFormatChanged(const QString &format) +{ + Q_UNUSED(format); + QGraphicsLayoutItem::updateGeometry(); + if(presenter()) presenter()->layout()->invalidate(); +} + +QSizeF ChartValueAxisY::sizeHint(Qt::SizeHint which, const QSizeF &constraint) const +{ + Q_UNUSED(constraint) + + QSizeF sh; + QSizeF base = VerticalAxis::sizeHint(which, constraint); + QStringList ticksList = createValueLabels(min(),max(),m_axis->tickCount(),m_axis->labelFormat()); + qreal width = 0; + // Height of vertical axis sizeHint indicates the maximum distance labels can extend past + // first and last ticks. Base height is irrelevant. + qreal height = 0; + + switch (which) { + case Qt::MinimumSize: { + QRectF boundingRect = ChartPresenter::textBoundingRect(axis()->labelsFont(), + QStringLiteral("..."), + axis()->labelsAngle()); + width = boundingRect.width() + labelPadding() + base.width() + 1.0; + height = boundingRect.height() / 2.0; + sh = QSizeF(width, height); + break; + } + case Qt::PreferredSize: { + qreal labelWidth = 0.0; + qreal firstHeight = -1.0; + foreach (const QString& s, ticksList) { + QRectF rect = ChartPresenter::textBoundingRect(axis()->labelsFont(), s, axis()->labelsAngle()); + labelWidth = qMax(rect.width(), labelWidth); + height = rect.height(); + if (firstHeight < 0.0) + firstHeight = height; + } + width = labelWidth + labelPadding() + base.width() + 2.0; //two pixels of tolerance + height = qMax(height, firstHeight) / 2.0; + sh = QSizeF(width, height); + break; + } + default: + break; + } + return sh; +} + +#include "moc_chartvalueaxisy_p.cpp" + +QT_CHARTS_END_NAMESPACE |