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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 <QStandardItemModel>
#include <KChartChart>
#include <KChartLineDiagram>
#include <KChartHeaderFooter>
#include <KChartPosition>
#include <KChartBackgroundAttributes>
#include <KChartFrameAttributes>
#include <KChartGridAttributes>
#include <KChartAbstractCoordinatePlane>
#include <KChartCartesianCoordinatePlane>
#include <KChartAbstractCartesianDiagram>
#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, 6, QModelIndex() );
m_model.insertColumns( 0, 4, QModelIndex() );
for (int row = 0; row < 6; ++row) {
for (int column = 0; column < 4; ++column) {
QModelIndex index = m_model.index(row, column, QModelIndex());
m_model.setData(index, QVariant(row*0.5 + column) );
}
}
LineDiagram* diagram = new LineDiagram;
diagram->setModel(&m_model);
CartesianAxis *xAxis = new CartesianAxis( diagram );
CartesianAxis *yAxis = new CartesianAxis ( diagram );
xAxis->setPosition ( KChart::CartesianAxis::Bottom );
yAxis->setPosition ( KChart::CartesianAxis::Left );
diagram->addAxis( xAxis );
diagram->addAxis( yAxis );
m_chart.coordinatePlane()->replaceDiagram(diagram);
/* Header */
// Add at one Header and set it up
HeaderFooter* header = new HeaderFooter( &m_chart );
header->setPosition( Position::North );
header->setText( "A Line Chart with Grid Configured" );
m_chart.addHeaderFooter( header );
// Configure the Header text attributes
TextAttributes hta;
hta.setPen( QPen( Qt::red ) );
// let the header resize itself
// together with the widget.
// so-called relative size
Measure m( 35.0 );
m.setRelativeMode( header->autoReferenceArea(),
KChartEnums::MeasureOrientationMinimum );
hta.setFontSize( m );
// min font size
m.setValue( 3.0 );
m.setCalculationMode( KChartEnums::MeasureCalculationModeAbsolute );
hta.setMinimalFontSize( m );
header->setTextAttributes( hta );
// Configure the Header's Background
BackgroundAttributes hba;
hba.setBrush( Qt::white );
hba.setVisible( true );
header->setBackgroundAttributes( hba );
// Configure the header Frame attributes
FrameAttributes hfa;
hfa.setPen( QPen ( QBrush( Qt::darkGray ), 2 ) );
hfa.setPadding( 2 );
hfa.setVisible( true );
header->setFrameAttributes( hfa );
// diagram->coordinatePlane returns an abstract plane one.
// if we want to specify the orientation we need to cast
// as follow
CartesianCoordinatePlane* plane = static_cast <CartesianCoordinatePlane*>
( diagram->coordinatePlane() );
/* Configure grid steps and pen */
// Vertical
GridAttributes gv ( plane->gridAttributes( Qt::Vertical ) );
// Configure a grid pen
// I know it is horrible
// just for demo'ing
QPen gridPen( Qt::gray );
gridPen.setWidth( 2 );
gv.setGridPen( gridPen );
// Configure a sub-grid pen
QPen subGridPen( Qt::darkGray );
subGridPen.setStyle( Qt::DotLine );
gv.setSubGridPen( subGridPen );
// Display a blue zero line
gv.setZeroLinePen( QPen( Qt::blue ) );
// change step and substep width
// or any of those.
gv.setGridStepWidth( 1.0 );
gv.setGridSubStepWidth( 0.5 );
gv.setGridVisible( true );
gv.setSubGridVisible( true );
// Horizontal
GridAttributes gh = plane->gridAttributes( Qt::Horizontal );
gh.setGridPen( gridPen );
gh.setGridStepWidth( 0.5 );
gh.setSubGridPen( subGridPen );
gh.setGridSubStepWidth( 0.1 );
plane->setGridAttributes( Qt::Vertical, gv );
plane->setGridAttributes( Qt::Horizontal, gh );
// Data Values Display and position
const int colCount = diagram->model()->columnCount(diagram->rootIndex());
for ( int iColumn = 0; iColumn<colCount; ++iColumn ) {
DataValueAttributes a( diagram->dataValueAttributes( iColumn ) );
RelativePosition pos ( a.position( true ) );
pos.setAlignment( Qt::AlignRight );
a.setPositivePosition( pos );
QBrush brush( diagram->brush( iColumn ) );
TextAttributes ta( a.textAttributes() );
ta.setRotation( 0 );
ta.setFont( QFont( "Comic", 10 ) );
ta.setPen( QPen( brush.color() ) );
ta.setVisible( true );
a.setVisible( true );
a.setTextAttributes( ta );
diagram->setDataValueAttributes( iColumn, a );
}
QVBoxLayout* l = new QVBoxLayout(this);
l->addWidget(&m_chart);
m_chart.setGlobalLeadingRight( 20 );
setLayout(l);
}
private:
Chart m_chart;
QStandardItemModel m_model;
QPixmap pixmap;
};
int main( int argc, char** argv ) {
QApplication app( argc, argv );
ChartWidget w;
w.show();
return app.exec();
}
#include "main.moc"
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