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/**
* 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 <KChartChart>
#include <KChartPlotter>
#include <KChartLineDiagram>
#include <KChartCartesianAxis>
#include <KChartCartesianCoordinatePlane>
#include <KChartLegend>
#include <QStandardItemModel>
#include <KChartDataValueAttributes>
#include <KChartTextAttributes>
#include <KChartMarkerAttributes>
#include <cmath>
#define PI 3.141592653589793
// enable the next line to see points instead of lines:
// #define PLOTTED_POINTS
int main( int argc, char** argv )
{
QApplication app( argc, argv );
#if defined PLOTTED_POINTS
const int points = 60;
#else
const int points = 1000;
#endif
const qreal xMin = -2 * PI;
const qreal xMax = 2 * PI;
const qreal step = ( xMax - xMin ) / ( points - 1 );
QStandardItemModel model( points, 6 );
double x = xMin;
for ( int n = 0; n < points; ++n, x += step) {
QModelIndex index = model.index( n, 0 );
model.setData( index, x );
index = model.index( n, 1 );
model.setData( index, sin( x ) * 100.0 );
index = model.index( n, 2 );
model.setData( index, x );
index = model.index( n, 3 );
model.setData( index, x );
index = model.index( n, 4 );
model.setData( index, x );
index = model.index( n, 5 );
model.setData( index, x * x * x );
}
model.setHeaderData( 0, Qt::Horizontal, QString::fromLatin1( "100 * sin(x)" ) );
model.setHeaderData( 2, Qt::Horizontal, QString::fromLatin1( "x" ) );
model.setHeaderData( 4, Qt::Horizontal, QString::fromLatin1( "x^3" ) );
KChart::Chart* chart = new KChart::Chart();
KChart::AbstractCartesianDiagram* diagram = new KChart::Plotter;
diagram->setModel( &model );
chart->coordinatePlane()->replaceDiagram( diagram );
#if defined PLOTTED_POINTS
diagram->setPen( QPen(Qt::NoPen) );
const int colCount = model.columnCount( diagram->rootIndex() );
for ( int iColumn = 0; iColumn<colCount; ++iColumn ) {
const QPen markerPen( diagram->brush( iColumn ).color() );
KChart::DataValueAttributes dva( diagram->dataValueAttributes( iColumn ) );
KChart::TextAttributes ta( dva.textAttributes() );
KChart::MarkerAttributes ma( dva.markerAttributes() );
ma.setPen( markerPen );
ma.setMarkerStyle( KChart::MarkerAttributes::MarkerCircle );
ma.setMarkerSize( QSize( 3,3 ) );
dva.setVisible( true );
ta.setVisible( false );
ma.setVisible( true );
dva.setTextAttributes( ta );
dva.setMarkerAttributes( ma );
diagram->setDataValueAttributes( iColumn, dva );
}
#endif
KChart::CartesianAxis* xAxis = new KChart::CartesianAxis( diagram );
KChart::CartesianAxis* yAxis = new KChart::CartesianAxis( diagram );
xAxis->setPosition( KChart::CartesianAxis::Bottom );
yAxis->setPosition( KChart::CartesianAxis::Left );
diagram->addAxis( xAxis );
diagram->addAxis( yAxis );
KChart::Legend* legend = new KChart::Legend( diagram, chart );
legend->setPosition( KChart::Position::East );
legend->setAlignment( Qt::AlignCenter );
legend->setTitleText( "Legend" );
chart->addLegend( legend );
chart->show();
return app.exec();
}
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