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restore zoomlinechart example
restore zoomlinechart example
Marek Rosa - - Load All Authors

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r2323:e9844f86b718
r2324:611d357cfff4
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chartlogvalueaxisy.cpp
131 lines | 4.1 KiB | text/x-c | CppLexer
/ src / axis / logvalueaxis / chartlogvalueaxisy.cpp
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Marek Rosa
QLogValueAxis added. Log domain missing
 r2274 /****************************************************************************
**
** Copyright (C) 2012 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 Commercial Charts Add-on.
**
** $QT_BEGIN_LICENSE$
** Licensees holding valid Qt Commercial licenses may use this file in
** accordance with the Qt Commercial 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 "chartlogvalueaxisy_p.h"
#include "chartpresenter_p.h"
#include "qlogvalueaxis.h"
#include "chartlayout_p.h"
#include <QGraphicsLayout>
#include <QFontMetrics>
#include <qmath.h>
QTCOMMERCIALCHART_BEGIN_NAMESPACE
ChartLogValueAxisY::ChartLogValueAxisY(QLogValueAxis *axis, QGraphicsItem* item)
: VerticalAxis(axis, item),
m_axis(axis)
{
Marek Rosa
Fixed: chart not redrawing when logaxis's logBase value changed
 r2322 QObject::connect(m_axis, SIGNAL(baseChanged(qreal)),this, SLOT(handleBaseChanged(qreal)));
Marek Rosa
Fixed: axis not redrawing when labelFormat changed
 r2323 QObject::connect(m_axis,SIGNAL(labelFormatChanged(QString)),this, SLOT(handleLabelFormatChanged(QString)));
Marek Rosa
QLogValueAxis added. Log domain missing
 r2274 }
ChartLogValueAxisY::~ChartLogValueAxisY()
{
}
QVector<qreal> ChartLogValueAxisY::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());
Marek Rosa
Domains added
 r2275 qreal leftEdge = logMin < logMax ? logMin : logMax;
qreal ceilEdge = ceil(leftEdge);
Marek Rosa
QLogValueAxis added. Log domain missing
 r2274 int tickCount = qAbs(qRound(logMax - logMin));
Marek Rosa
Domains added
 r2275 tickCount++;
Marek Rosa
QLogValueAxis added. Log domain missing
 r2274
points.resize(tickCount);
const QRectF &gridRect = gridGeometry();
const qreal deltaY = gridRect.height() / qAbs(logMax - logMin);
for (int i = 0; i < tickCount; ++i)
Marek Rosa
Domains added
 r2275 points[i] = (ceilEdge + i) * -deltaY - leftEdge * -deltaY + gridRect.bottom();
Marek Rosa
QLogValueAxis added. Log domain missing
 r2274
return points;
}
void ChartLogValueAxisY::updateGeometry()
{
const QVector<qreal> &layout = ChartAxis::layout();
if (layout.isEmpty())
return;
setLabels(createLogValueLabels(m_axis->min(), m_axis->max(), m_axis->base(), layout.size(), m_axis->labelFormat()));
VerticalAxis::updateGeometry();
}
Marek Rosa
Fixed: chart not redrawing when logaxis's logBase value changed
 r2322 void ChartLogValueAxisY::handleBaseChanged(qreal base)
{
Q_UNUSED(base);
if(presenter()) presenter()->layout()->invalidate();
}
Marek Rosa
QLogValueAxis added. Log domain missing
 r2274
Marek Rosa
Fixed: axis not redrawing when labelFormat changed
 r2323 void ChartLogValueAxisY::handleLabelFormatChanged(const QString &format)
{
Q_UNUSED(format);
if(presenter()) presenter()->layout()->invalidate();
}
Marek Rosa
QLogValueAxis added. Log domain missing
 r2274 QSizeF ChartLogValueAxisY::sizeHint(Qt::SizeHint which, const QSizeF &constraint) const
{
Q_UNUSED(constraint)
QFontMetrics fn(font());
QSizeF sh;
QSizeF base = VerticalAxis::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(qRound(logMax - logMin));
Marek Rosa
Domains added
 r2275 tickCount++;
Marek Rosa
QLogValueAxis added. Log domain missing
 r2274 if (m_axis->max() > m_axis->min() && tickCount > 1)
ticksList = createLogValueLabels(m_axis->min(), m_axis->max(), m_axis->base(), tickCount, m_axis->labelFormat());
else
ticksList.append(QString(" "));
qreal width = 0;
qreal height = 0;
switch (which) {
case Qt::MinimumSize: {
width = fn.boundingRect("...").width() + labelPadding();
width += base.width();
height = fn.height();
height = qMax(height,base.height());
sh = QSizeF(width,height);
break;
}
case Qt::PreferredSize: {
int count = qMax(ticksList.first().count() , ticksList.last().count());
width = count*fn.averageCharWidth() + labelPadding() + 2; //two pixels of tolerance
width += base.width();
height = fn.height() * ticksList.count();
height = qMax(height,base.height());
sh = QSizeF(width,height);
break;
}
default:
break;
}
return sh;
}
Marek Rosa
Fixed: chart not redrawing when logaxis's logBase value changed
 r2322 #include "moc_chartlogvalueaxisy_p.cpp"
Marek Rosa
QLogValueAxis added. Log domain missing
 r2274 QTCOMMERCIALCHART_END_NAMESPACE