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Optimize polar chart radius calculation a bit....
Optimize polar chart radius calculation a bit. Current algorithm still results in an occasional extra unneeded iteration, as it uses only crude approximation for radius reduction. However, any speedup gained by accurately calculating needed reduction would be very minor compared to approximations used, so it doesn't seem worth the effort to figure out the complex math. Change-Id: If670a1b058a85cd0305b93f62e6388b463bafd0d Reviewed-by: Tomi Korpipää <tomi.korpipaa@digia.com>
Miikka Heikkinen - - Load All Authors

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r2483:f494279b6366
r2542:189023d9a551
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polarchartvalueaxisangular.cpp
80 lines | 2.4 KiB | text/x-c | CppLexer
/ src / axis / valueaxis / polarchartvalueaxisangular.cpp
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Miikka Heikkinen
Add Polar chart support...
 r2483 /****************************************************************************
**
** Copyright (C) 2013 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 "polarchartvalueaxisangular_p.h"
#include "chartpresenter_p.h"
#include "abstractchartlayout_p.h"
QTCOMMERCIALCHART_BEGIN_NAMESPACE
PolarChartValueAxisAngular::PolarChartValueAxisAngular(QValueAxis *axis, QGraphicsItem *item)
: PolarChartAxisAngular(axis, item)
{
QObject::connect(axis, SIGNAL(tickCountChanged(int)), this, SLOT(handleTickCountChanged(int)));
QObject::connect(axis, SIGNAL(labelFormatChanged(QString)), this, SLOT(handleLabelFormatChanged(QString)));
}
PolarChartValueAxisAngular::~PolarChartValueAxisAngular()
{
}
QVector<qreal> PolarChartValueAxisAngular::calculateLayout() const
{
int tickCount = static_cast<QValueAxis *>(axis())->tickCount();
Q_ASSERT(tickCount >= 2);
QVector<qreal> points;
points.resize(tickCount);
const qreal d = 360.0 / qreal(tickCount - 1);
for (int i = 0; i < tickCount; ++i) {
qreal angularCoordinate = qreal(i) * d;
points[i] = angularCoordinate;
}
return points;
}
void PolarChartValueAxisAngular::createAxisLabels(const QVector<qreal> &layout)
{
QStringList labelList = createValueLabels(min(), max(), layout.size(), static_cast<QValueAxis *>(axis())->labelFormat());
setLabels(labelList);
}
void PolarChartValueAxisAngular::handleTickCountChanged(int tick)
{
Q_UNUSED(tick);
QGraphicsLayoutItem::updateGeometry();
if (presenter())
presenter()->layout()->invalidate();
}
void PolarChartValueAxisAngular::handleLabelFormatChanged(const QString &format)
{
Q_UNUSED(format);
QGraphicsLayoutItem::updateGeometry();
if (presenter())
presenter()->layout()->invalidate();
}
#include "moc_polarchartvalueaxisangular_p.cpp"
QTCOMMERCIALCHART_END_NAMESPACE