File indexing completed on 2024-05-19 15:26:57

 /**
  * 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 );
 }