File indexing completed on 2025-02-16 04:03:07

 /**
  * 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 <KChartPolarDiagram>
 #include <KChartDataValueAttributes>
 #include <KChartBackgroundAttributes>
 
 #include <QApplication>
 
 using namespace KChart;
 
 class ChartWidget : public QWidget {
     Q_OBJECT
 public:
     explicit ChartWidget(QWidget* parent = nullptr)
         : QWidget(parent)
     {
 
         // initialize the ItemModel and fill in some data
         m_model.insertRows( 0, 10 );
         m_model.insertColumns(  0,  5 );
         int value = 0;
         for ( int column = 0; column < m_model.columnCount(); ++column ) {
             for ( int row = 0; row < m_model.rowCount(); ++row ) {
                 QModelIndex index = m_model.index( row, column );
                 m_model.setData( index, QVariant( value++  ) );
             }
         }
         // We need a Polar plane for the Polar type
         PolarCoordinatePlane* polarPlane = new PolarCoordinatePlane( &m_chart );
         // replace the default Cartesian plane with
         // our Polar plane
         m_chart.replaceCoordinatePlane( polarPlane );
 
         // assign the model to our polar diagram
         PolarDiagram* diagram = new PolarDiagram;
         diagram->setModel(&m_model);
 
         // Configure the plane's Background
         BackgroundAttributes pba;
         pba.setBrush( QBrush(QColor(0x20,0x20,0x60)) );
         pba.setVisible( true );
         polarPlane->setBackgroundAttributes(  pba );
 
 
         // Configure some global / dataset / cell specific attributes:
 
         DataValueAttributes dva( diagram->dataValueAttributes() );
         MarkerAttributes ma( dva.markerAttributes() );
         ma.setVisible( true );
         ma.setMarkerStyle( MarkerAttributes::MarkerSquare );
         ma.setMarkerSize( QSize( 6,6 ) );
         dva.setMarkerAttributes( ma );
         // find a nicer place for the data value texts:
         // We want them to be centered on top of their respective markers.
         RelativePosition relativePosition( dva.positivePosition() );
         relativePosition.setReferencePosition( Position::Center );
         relativePosition.setAlignment( Qt::AlignBottom | Qt::AlignHCenter );
         relativePosition.setHorizontalPadding( KChart::Measure( 0.0, KChartEnums::MeasureCalculationModeAbsolute ) );
         relativePosition.setVerticalPadding(   KChart::Measure( 0.0, KChartEnums::MeasureCalculationModeAbsolute ) );
         dva.setPositivePosition( relativePosition );
         diagram->setDataValueAttributes( dva );
 
         // Display data values
         const QFont font(QFont( "Comic", 10 ));
         const int colCount = diagram->model()->columnCount();
         for ( int iColumn = 0; iColumn<colCount; ++iColumn ) {
             DataValueAttributes dva( diagram->dataValueAttributes( iColumn ) );
             TextAttributes ta( dva.textAttributes() );
             ta.setRotation( 0 );
             ta.setFont( font );
             ta .setPen( QPen( Qt::gray ) );
             ta.setVisible( true );
             dva.setTextAttributes( ta );
             dva.setVisible( true );
             diagram->setDataValueAttributes( iColumn, dva);
         }
 
 
         // Set the marker of one single cell differently to show
         // how per-cell marker attributes can be used:
         const QModelIndex index = diagram->model()->index( 1, 2, QModelIndex() );
         dva = diagram->dataValueAttributes( index );
         ma = dva.markerAttributes();
         ma.setMarkerStyle( MarkerAttributes::MarkerCircle );
         ma.setMarkerSize( QSize( 40,40 ) );
 
         // This is the canonical way to adjust a marker's color:
         // By default the color is invalid so we use an explicit fallback
         // here to make sure we are getting the right color, as it would
         // be used by KD Chart's built-in logic too:
         QColor semiTrans( ma.markerColor() );
         if ( ! semiTrans.isValid() )
             semiTrans = diagram->brush( index ).color();
 
         semiTrans.setAlpha(164);
         ma.setMarkerColor( semiTrans.darker() );
 
         dva.setMarkerAttributes( ma );
 
         // While we are at it we also set the text alignment to centered
         // for this special point:
         relativePosition = dva.positivePosition();
         relativePosition.setAlignment( Qt::AlignCenter );
         dva.setPositivePosition( relativePosition );
         diagram->setDataValueAttributes( index, dva);
 
 
 
         // Assign our diagram to the Chart
         m_chart.coordinatePlane()->replaceDiagram(diagram);
 
         // We want to have a nice gap around the polar diagram,
         // but we also want to have the coord. plane's background cover that area,
         // so we just use some zooming.
         // NOTE: Setting a zoom factor must not be done before
         //       a diagram has been specified and assigned to the coordinate plane!
         polarPlane->setZoomFactorX(0.9);
         polarPlane->setZoomFactorY(0.9);
 
         QVBoxLayout* l = new QVBoxLayout(this);
         l->addWidget(&m_chart);
         m_chart.setGlobalLeadingTop( 5 );
         m_chart.setGlobalLeadingBottom( 5 );
         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"