File indexing completed on 2024-06-16 04:09:02

 /**
  * SPDX-FileCopyrightText: 2001-2015 Klaralvdalens Datakonsult AB. All rights reserved.
  *
  * This file is part of the KD Chart library.
  *
  * SPDX-License-Identifier: GPL-2.0-or-later
  */
 
 #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 we prevent
         // QAbstractItemModel from emitting dataChanged, we collect what data changed and
         // we emit the signal at the end ourself.
         m_model->blockSignals(true);
         QModelIndexList indexes;
 
         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"