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/****************************************************************************
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**
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** Copyright (C) 2012 Digia Plc
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** All rights reserved.
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** For any questions to Digia, please use contact form at http://qt.digia.com
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**
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** This file is part of the Qt Commercial Charts Add-on.
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**
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** $QT_BEGIN_LICENSE$
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** Licensees holding valid Qt Commercial licenses may use this file in
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** accordance with the Qt Commercial License Agreement provided with the
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** Software or, alternatively, in accordance with the terms contained in
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** a written agreement between you and Digia.
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**
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** If you have questions regarding the use of this file, please use
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** contact form at http://qt.digia.com
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#include "chartlogvalueaxisy_p.h"
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#include "chartpresenter_p.h"
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#include "qlogvalueaxis.h"
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#include "chartlayout_p.h"
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#include <QGraphicsLayout>
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#include <QFontMetrics>
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#include <qmath.h>
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QTCOMMERCIALCHART_BEGIN_NAMESPACE
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ChartLogValueAxisY::ChartLogValueAxisY(QLogValueAxis *axis, QGraphicsItem* item)
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: VerticalAxis(axis, item),
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m_axis(axis)
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{
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}
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ChartLogValueAxisY::~ChartLogValueAxisY()
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{
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}
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QVector<qreal> ChartLogValueAxisY::calculateLayout() const
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{
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QVector<qreal> points;
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qreal logMax = log10(m_axis->max()) / log10(m_axis->base());
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qreal logMin = log10(m_axis->min()) / log10(m_axis->base());
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qreal leftEdge = logMin < logMax ? logMin : logMax;
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qreal ceilEdge = ceil(leftEdge);
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int tickCount = qAbs(qRound(logMax - logMin));
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tickCount++;
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points.resize(tickCount);
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const QRectF &gridRect = gridGeometry();
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const qreal deltaY = gridRect.height() / qAbs(logMax - logMin);
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for (int i = 0; i < tickCount; ++i)
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points[i] = (ceilEdge + i) * -deltaY - leftEdge * -deltaY + gridRect.bottom();
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return points;
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}
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void ChartLogValueAxisY::updateGeometry()
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{
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const QVector<qreal> &layout = ChartAxis::layout();
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if (layout.isEmpty())
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return;
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setLabels(createLogValueLabels(m_axis->min(), m_axis->max(), m_axis->base(), layout.size(), m_axis->labelFormat()));
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VerticalAxis::updateGeometry();
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}
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//void ChartLogValueAxisY::handleAxisUpdated()
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//{
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// ChartAxis::handleAxisUpdated();
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//}
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QSizeF ChartLogValueAxisY::sizeHint(Qt::SizeHint which, const QSizeF &constraint) const
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{
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Q_UNUSED(constraint)
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QFontMetrics fn(font());
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QSizeF sh;
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QSizeF base = VerticalAxis::sizeHint(which, constraint);
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QStringList ticksList;
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qreal logMax = log10(m_axis->max()) / log10(m_axis->base());
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qreal logMin = log10(m_axis->min()) / log10(m_axis->base());
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int tickCount = qAbs(qRound(logMax - logMin));
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tickCount++;
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if (m_axis->max() > m_axis->min() && tickCount > 1)
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ticksList = createLogValueLabels(m_axis->min(), m_axis->max(), m_axis->base(), tickCount, m_axis->labelFormat());
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else
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ticksList.append(QString(" "));
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qreal width = 0;
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qreal height = 0;
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switch (which) {
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case Qt::MinimumSize: {
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width = fn.boundingRect("...").width() + labelPadding();
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width += base.width();
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height = fn.height();
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height = qMax(height,base.height());
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sh = QSizeF(width,height);
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break;
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}
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case Qt::PreferredSize: {
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int count = qMax(ticksList.first().count() , ticksList.last().count());
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width = count*fn.averageCharWidth() + labelPadding() + 2; //two pixels of tolerance
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width += base.width();
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height = fn.height() * ticksList.count();
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height = qMax(height,base.height());
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sh = QSizeF(width,height);
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break;
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}
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default:
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break;
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}
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return sh;
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}
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QTCOMMERCIALCHART_END_NAMESPACE
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