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/**
* Copyright (C) 2001-2015 Klaralvdalens Datakonsult AB. All rights reserved.
*
* This file is part of the KD Chart library.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#include <QApplication>
#include <QStandardItemModel>
#include <QTreeView>
#include <QTimer>
#include <QWidget>
#include <QSplitter>
#include <QPushButton>
#include <math.h>
#include <KChartChart>
#include <KChartPlotter>
#include "timeaxis.h"
#include "timechartmodel.h"
class ChartWidget : public QWidget {
Q_OBJECT
public:
explicit ChartWidget(QWidget* parent = nullptr) : QWidget(parent), m_counter(0) {
QSplitter* splitter = new QSplitter(this);
QHBoxLayout* l = new QHBoxLayout(this);
setLayout(l);
l->addWidget( splitter );
QWidget* leftWidget = new QWidget( splitter );
QVBoxLayout* leftLayout = new QVBoxLayout(leftWidget);
leftWidget->setLayout(leftLayout);
QPushButton* button = new QPushButton("Animate", leftWidget);
leftLayout->addWidget( button );
button->setCheckable( true );
connect( button, SIGNAL(toggled(bool)), this, SLOT(buttonToggled(bool)) );
QTreeView* tv = new QTreeView( leftWidget );
leftLayout->addWidget( tv );
m_chart = new KChart::Chart( splitter );
m_model = new QStandardItemModel( 365, 2, this );
for ( int i = 0; i < 365; ++i ) {
const QDateTime dt = QDateTime( QDate( 2010, 1, 1 ), QTime() );
m_model->setData( m_model->index( i, 0 ), dt.addDays( i ) );
m_model->setData( m_model->index( i, 1 ), sin( i / 10.0 ) * 10 );
}
TimeChartModel* proxy = new TimeChartModel( this );
proxy->setSourceModel( m_model );
proxy->setVisibleRange( QDateTime( QDate( 2010, 2, 1 ), QTime() ),
QDateTime( QDate( 2010, 3, 31 ), QTime() ) );
KChart::Plotter* plotter = new KChart::Plotter;
m_chart->coordinatePlane()->replaceDiagram( plotter );
tv->setModel( proxy );
tv->show();
TimeAxis* axis = new TimeAxis( plotter );
axis->setPosition( TimeAxis::Bottom );
plotter->addAxis( axis );
plotter->setModel( proxy );
connect( proxy, SIGNAL(rowsInserted(QModelIndex,int,int)),
m_chart->coordinatePlane(), SLOT(adjustRangesToData()) );
connect( proxy, SIGNAL(rowsRemoved(QModelIndex,int,int)),
m_chart->coordinatePlane(), SLOT(adjustRangesToData()) );
proxy->setVisibleRange( QDateTime( QDate( 2010, 3, 15 ), QTime() ),
QDateTime( QDate( 2010, 5, 18 ), QTime() ) );
qobject_cast< KChart::CartesianCoordinatePlane* >( m_chart->coordinatePlane() )->adjustRangesToData();
m_timer = new QTimer(this);
connect( m_timer, SIGNAL(timeout()), this, SLOT(slotTimeout()) );
}
private Q_SLOTS:
void slotTimeout() {
// An ugly hack to prevent the QAbstractItemModel from emitting dataChanged
// for every single call to setData which would result in a full relayout
// every time. That is horrible for performance and what we do is to prevent
// QAbstractItemModel to Q_EMIT dataChanged, collect what data changed and
// Q_EMIT the signal at the end ourself.
m_model->blockSignals(true);
QModelIndexList indexes;
QVariant v1, v2;
for ( int i = 0; i < 365; ++i ) {
QModelIndex idx = m_model->index( i, 1 );
indexes.append(idx);
m_model->setData( idx, sin( i / 10.0 + m_counter ) * 10 );
}
m_model->blockSignals(false);
if (!indexes.isEmpty()) {
m_model->metaObject()->invokeMethod(m_model, "dataChanged", Qt::DirectConnection, Q_ARG(QModelIndex,indexes.first()), Q_ARG(QModelIndex,indexes.last()));
}
m_counter += 0.02;
}
void buttonToggled(bool checked) {
if (checked)
m_timer->start( 200 );
else
m_timer->stop();
}
private:
KChart::Chart* m_chart;
QStandardItemModel* m_model;
QTimer* m_timer;
qreal m_counter;
};
/**
* This example demonstrates how to use time-based plots with timestamp-value data points
* based on seconds and how to use a proxy model for defining the plotted "window" of the
* measurement data.
*/
int main( int argc, char* argv[] )
{
QApplication app( argc, argv );
ChartWidget w;
w.show();
return app.exec();
}
#include "main.moc"
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