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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 "mainwindow.h"
#include <KChartChart>
#include <KChartAbstractCoordinatePlane>
#include <KChartCartesianAxis>
#include <KChartLineDiagram>
#include <KChartLegend>
#include <QDebug>
#include <QPen>
#include <QHBoxLayout>
#include <QStandardItemModel>
using namespace KChart;
class EmptyModel : public QAbstractItemModel
{
public:
EmptyModel( QObject* parent = nullptr )
: QAbstractItemModel( parent )
{
//qDebug() << "EmptyModel::EmptyModel()";
}
~EmptyModel()
{
//qDebug() << "EmptyModel::~EmptyModel()";
}
int columnCount( const QModelIndex& parent = QModelIndex() ) const override
{
Q_UNUSED( parent );
//qDebug() << "EmptyModel::columnCount(...)";
return 0;
}
int rowCount( const QModelIndex& parent = QModelIndex() ) const override
{
Q_UNUSED( parent );
//qDebug() << "EmptyModel::rowCount(...)";
return 0;
}
// NOTE: The following method will not be called by KD Chart,
// because the model is returning 0 for columnCount() / rowCount().
QVariant data( const QModelIndex& index, int role = Qt::DisplayRole ) const override
{
Q_UNUSED( role );
qDebug() << "EmptyModel::data(" << index.row() << index.column() << ")";
Q_ASSERT_X( false, "EmptyModel::data", "We should not end here..." );
return QVariant();
}
QModelIndex index( int row, int column, const QModelIndex& parent = QModelIndex() ) const override
{
Q_UNUSED( row );
Q_UNUSED( column );
Q_UNUSED( parent );
//qDebug() << "EmptyModel::index(" << row << column << ")";
return QModelIndex();
}
QModelIndex parent( const QModelIndex& parent ) const override
{
Q_UNUSED( parent );
//qDebug() << "EmptyModel::parent(...)";
return QModelIndex();
}
};
MainWindow::MainWindow( QWidget* parent ) :
QWidget( parent )
{
QHBoxLayout* chartLayout = new QHBoxLayout( this );
m_chart = new Chart();
m_chart->setGlobalLeading( 5, 5, 5, 5 );
chartLayout->addWidget( m_chart );
m_model = new EmptyModel( this ); // model contains no data at all
// Set up the diagram
m_bars = new LineDiagram();
m_bars->setModel( m_model );
CartesianAxis *xAxis = new CartesianAxis( m_bars );
CartesianAxis *yAxis = new CartesianAxis ( m_bars );
xAxis->setPosition ( KChart::CartesianAxis::Bottom );
yAxis->setPosition ( KChart::CartesianAxis::Left );
xAxis->setTitleText ( "Abscissa axis at the bottom" );
yAxis->setTitleText ( "Ordinate axis at the left side" );
m_bars->addAxis( xAxis );
m_bars->addAxis( yAxis );
m_chart->coordinatePlane()->replaceDiagram( m_bars );
Legend* legend = new Legend( m_bars, m_chart );
legend->setPosition( Position::South );
legend->setAlignment( Qt::AlignCenter );
legend->setShowLines( true );
legend->setTitleText("This is the legend - showing no data either");
legend->setOrientation( Qt::Horizontal );
legend->addDiagram( m_bars );
m_chart->addLegend( legend );
}
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