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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 <QStandardItemModel>
#include <KChartChart>
#include <KChartLineDiagram>
#include <KChartDataValueAttributes>
#include <QApplication>
using namespace KChart;
class ChartWidget : public QWidget {
Q_OBJECT
public:
explicit ChartWidget(QWidget* parent = nullptr)
: QWidget(parent)
{
m_model.insertRows( 0,5, QModelIndex() );
m_model.insertColumns( 0,5, QModelIndex() );
qreal increase = 1.15;
for ( int i = 0; i < 5; ++i ) {
increase += 0.06;
for ( int j = 0; j < 5; ++j ) {
m_model.setData( m_model.index( i,j,QModelIndex() ),
( increase + i ) * j * (1.0 + 0.1 * (rand() % 10)) );
}
}
LineDiagram* diagram = new LineDiagram;
diagram->setModel(&m_model);
// Display values
// 1 - Call the relevant attributes
DataValueAttributes dva( diagram->dataValueAttributes() );
// 2 - We want to configure the font and colors
// for the data values text.
TextAttributes ta( dva.textAttributes() );
dva.setDecimalDigits( 2 );
// Append a prefix/suffix to the
// data value labels being displayed
//
//dva.setPrefix( "* " );
dva.setSuffix( " Ohm" );
//rotate if you wish
//ta.setRotation( 0 );
// 3 - Set up your text attributes
ta.setFont( QFont( "Comic") );
ta .setPen( QPen( QColor( Qt::darkGreen ) ) );
ta.setVisible( true );
// font size
Measure me( ta.fontSize() );
me.setValue( me.value() * 0.25 );
ta.setFontSize( me );
// 4 - Assign the text attributes to your
// DataValuesAttributes
dva.setTextAttributes( ta );
dva.setVisible( true );
// 5 - Assign to the diagram
diagram->setDataValueAttributes( dva );
// Set thick line widths for all datasets
for ( int i = 0; i < m_model.rowCount(); ++i ) {
QPen pen( diagram->pen( i ) );
pen.setWidth( 17 );
diagram->setPen( i, pen );
}
// Draw one of the sections of a line differently.
// 1 - Retrieve the pen for the dataset and change
// its style.
// This allow us to keep the line original color.
QPen linePen( diagram->pen( 1 ) );
linePen.setColor( Qt::yellow );
linePen.setWidth( 7 );
linePen.setStyle( Qt::DashLine );
// 2 - Change the Pen for a section within a line
// while assigning it to the diagram
diagram->setPen( m_model.index( 1, 1, QModelIndex() ), linePen );
// 3 - Assign to the chart
m_chart.coordinatePlane()->replaceDiagram(diagram);
m_chart.setGlobalLeadingRight( 50 );
QVBoxLayout* l = new QVBoxLayout(this);
l->addWidget(&m_chart);
setLayout(l);
}
private:
Chart m_chart;
QStandardItemModel m_model;
};
int main( int argc, char** argv )
{
QApplication app( argc, argv );
ChartWidget w;
w.show();
return app.exec();
}
#include "main.moc"
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