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Minor docs updates
Minor docs updates
Tero Ahola - - Load All Authors

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r2312:2932f3712717
r2393:150f5f56819e
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datasource.cpp
91 lines | 2.5 KiB | text/x-c | CppLexer
/ demos / qmloscilloscope / datasource.cpp
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Tero Ahola
Added a new QXYSeries::replace override for performance reasons....
 r1783 /****************************************************************************
**
** 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 "datasource.h"
#include <QXYSeries>
Tero Ahola
Improved oscilloscope demo functionality
 r1785 #include <QAreaSeries>
Tero Ahola
Disabled anti-aliasing by default in declarative impl
 r1910 #include <QDeclarativeView>
Tero Ahola
Improved oscilloscope demo functionality
 r1785 #include <QGLWidget>
Tero Ahola
Added a new QXYSeries::replace override for performance reasons....
 r1783 #include <QDebug>
Tero Ahola
Fix build on OSX: Added missing cmath include
 r1786 #include <cmath>
Tero Ahola
Added a new QXYSeries::replace override for performance reasons....
 r1783
QTCOMMERCIALCHART_USE_NAMESPACE
Tero Ahola
Disabled anti-aliasing by default in declarative impl
 r1910 DataSource::DataSource(QDeclarativeView *appViewer, QObject *parent) :
Tero Ahola
Added a new QXYSeries::replace override for performance reasons....
 r1783 QObject(parent),
Tero Ahola
Fix build on OSX: Added missing cmath include
 r1786 m_appViewer(appViewer),
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Improved oscilloscope demo functionality
 r1785 m_index(-1)
Tero Ahola
Added a new QXYSeries::replace override for performance reasons....
 r1783 {
Tero Ahola
Improved oscilloscope demo functionality
 r1785 // generate
generateData(0, 5, 1024);
}
void DataSource::update(QAbstractSeries *series)
{
QXYSeries *xySeries = qobject_cast<QXYSeries *>(series);
Q_ASSERT(xySeries);
m_index++;
if (m_index > m_data.count() - 1)
m_index = 0;
QList<QPointF> points = m_data.at(m_index);
// Use replace instead of clear + append, it's optimized for performance
xySeries->replace(points);
}
void DataSource::generateData(int type, int rowCount, int colCount)
{
// Remove previous data
foreach (QList<QPointF> row, m_data)
row.clear();
m_data.clear();
// Append the new data depending on the type
Tero Ahola
Added a new QXYSeries::replace override for performance reasons....
 r1783 for (int i(0); i < rowCount; i++) {
QList<QPointF> points;
for (int j(0); j < colCount; j++) {
Tero Ahola
Improved oscilloscope demo functionality
 r1785 qreal x(0);
qreal y(0);
switch (type) {
case 0:
// data with sin + random component
y = sin(3.14159265358979 / 50 * j) + 0.5 + (qreal) rand() / (qreal) RAND_MAX;
x = j;
break;
case 1:
// linear data
x = j;
y = (qreal) i / 10;
break;
default:
// unknown, do nothing
break;
}
Tero Ahola
Added a new QXYSeries::replace override for performance reasons....
 r1783 points.append(QPointF(x, y));
}
m_data.append(points);
}
}
Tero Ahola
Disabled anti-aliasing by default in declarative impl
 r1910 void DataSource::setAntialiasing(bool enabled)
{
m_appViewer->setRenderHint(QPainter::Antialiasing, enabled);
}