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examples/tvplot/TVPlot.cpp

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+/*****************************************************************************
+ * Qwt Examples - Copyright (C) 2002 Uwe Rathmann
+ * This file may be used under the terms of the 3-clause BSD License
+ *****************************************************************************/
+
+#include "TVPlot.h"
+
+#include <QwtPlotLayout>
+#include <QwtPlotCanvas>
+#include <QwtPlotRenderer>
+#include <QwtLegend>
+#include <QwtLegendLabel>
+#include <QwtPlotGrid>
+#include <QwtPlotHistogram>
+#include <QwtColumnSymbol>
+#include <QwtSeriesData>
+
+#include <QPen>
+#include <cstdlib>
+
+namespace
+{
+    class Histogram : public QwtPlotHistogram
+    {
+      public:
+        Histogram( const QString& title, const QColor& symbolColor )
+            : QwtPlotHistogram( title )
+        {
+            setStyle( QwtPlotHistogram::Columns );
+            setColor( symbolColor );
+        }
+
+        void setColor( const QColor& color )
+        {
+            QColor c = color;
+            c.setAlpha( 180 );
+            setBrush( QBrush( c ) );
+        }
+
+        void setValues( uint numValues, const double* values )
+        {
+            QVector< QwtIntervalSample > samples( numValues );
+            for ( uint i = 0; i < numValues; i++ )
+            {
+                QwtInterval interval( double( i ), i + 1.0 );
+                interval.setBorderFlags( QwtInterval::ExcludeMaximum );
+
+                samples[i] = QwtIntervalSample( values[i], interval );
+            }
+
+            setData( new QwtIntervalSeriesData( samples ) );
+        }
+    };
+}
+
+TVPlot::TVPlot( QWidget* parent )
+    : QwtPlot( parent )
+{
+    setTitle( "Watching TV during a weekend" );
+
+    QwtPlotCanvas* canvas = new QwtPlotCanvas();
+    canvas->setPalette( Qt::gray );
+    canvas->setBorderRadius( 10 );
+    setCanvas( canvas );
+
+    plotLayout()->setAlignCanvasToScales( true );
+
+    setAxisTitle( QwtAxis::YLeft, "Number of People" );
+    setAxisTitle( QwtAxis::XBottom, "Number of Hours" );
+
+    QwtLegend* legend = new QwtLegend;
+    legend->setDefaultItemMode( QwtLegendData::Checkable );
+    insertLegend( legend, QwtPlot::RightLegend );
+
+    populate();
+
+    connect( legend, SIGNAL(checked(const QVariant&,bool,int)),
+        SLOT(showItem(const QVariant&,bool)) );
+
+    replot(); // creating the legend items
+
+    QwtPlotItemList items = itemList( QwtPlotItem::Rtti_PlotHistogram );
+    for ( int i = 0; i < items.size(); i++ )
+    {
+        if ( i == 0 )
+        {
+            const QVariant itemInfo = itemToInfo( items[i] );
+
+            QwtLegendLabel* legendLabel =
+                qobject_cast< QwtLegendLabel* >( legend->legendWidget( itemInfo ) );
+            if ( legendLabel )
+                legendLabel->setChecked( true );
+
+            items[i]->setVisible( true );
+        }
+        else
+        {
+            items[i]->setVisible( false );
+        }
+    }
+
+    setAutoReplot( true );
+}
+
+void TVPlot::populate()
+{
+    QwtPlotGrid* grid = new QwtPlotGrid;
+    grid->enableX( false );
+    grid->enableY( true );
+    grid->enableXMin( false );
+    grid->enableYMin( false );
+    grid->setMajorPen( Qt::black, 0, Qt::DotLine );
+    grid->attach( this );
+
+    const double juneValues[] = { 7, 19, 24, 32, 10, 5, 3 };
+    const double novemberValues[] = { 4, 15, 22, 34, 13, 8, 4 };
+
+    Histogram* histogramJune = new Histogram( "Summer", Qt::red );
+    histogramJune->setValues(
+        sizeof( juneValues ) / sizeof( double ), juneValues );
+    histogramJune->attach( this );
+
+    Histogram* histogramNovember = new Histogram( "Winter", Qt::blue );
+    histogramNovember->setValues(
+        sizeof( novemberValues ) / sizeof( double ), novemberValues );
+    histogramNovember->attach( this );
+}
+
+void TVPlot::exportPlot()
+{
+    QwtPlotRenderer renderer;
+    renderer.exportTo( this, "tvplot.pdf" );
+}
+
+void TVPlot::setMode( int mode )
+{
+    QwtPlotItemList items = itemList( QwtPlotItem::Rtti_PlotHistogram );
+
+    for ( int i = 0; i < items.size(); i++ )
+    {
+        QwtPlotHistogram* histogram = static_cast< QwtPlotHistogram* >( items[i] );
+        if ( mode < 3 )
+        {
+            histogram->setStyle( static_cast< QwtPlotHistogram::HistogramStyle >( mode ) );
+            histogram->setSymbol( NULL );
+
+            QPen pen( Qt::black, 0 );
+            if ( mode == QwtPlotHistogram::Lines )
+                pen.setBrush( histogram->brush() );
+
+            histogram->setPen( pen );
+        }
+        else
+        {
+            histogram->setStyle( QwtPlotHistogram::Columns );
+
+            QwtColumnSymbol* symbol = new QwtColumnSymbol( QwtColumnSymbol::Box );
+            symbol->setFrameStyle( QwtColumnSymbol::Raised );
+            symbol->setLineWidth( 2 );
+            symbol->setPalette( QPalette( histogram->brush().color() ) );
+
+            histogram->setSymbol( symbol );
+        }
+    }
+}
+
+void TVPlot::showItem( const QVariant& itemInfo, bool on )
+{
+    if ( QwtPlotItem* plotItem = infoToItem( itemInfo ) )
+        plotItem->setVisible( on );
+}
+
+#include "moc_TVPlot.cpp"

examples/tvplot/TVPlot.h

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+/*****************************************************************************
+ * Qwt Examples - Copyright (C) 2002 Uwe Rathmann
+ * This file may be used under the terms of the 3-clause BSD License
+ *****************************************************************************/
+
+#pragma once
+
+#include <QwtPlot>
+
+class TVPlot : public QwtPlot
+{
+    Q_OBJECT
+
+  public:
+    TVPlot( QWidget* = NULL );
+
+  public Q_SLOTS:
+    void setMode( int );
+    void exportPlot();
+
+  private:
+    void populate();
+
+  private Q_SLOTS:
+    void showItem( const QVariant&, bool on );
+};

examples/tvplot/main.cpp

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+/*****************************************************************************
+ * Qwt Examples - Copyright (C) 2002 Uwe Rathmann
+ * This file may be used under the terms of the 3-clause BSD License
+ *****************************************************************************/
+
+#include "TVPlot.h"
+
+#include <QApplication>
+#include <QMainWindow>
+#include <QToolBar>
+#include <QToolButton>
+#include <QComboBox>
+
+namespace
+{
+    class MainWindow : public QMainWindow
+    {
+      public:
+        MainWindow()
+        {
+            TVPlot* plot = new TVPlot();
+            setCentralWidget( plot );
+
+            QComboBox* typeBox = new QComboBox();
+            typeBox->addItem( "Outline" );
+            typeBox->addItem( "Columns" );
+            typeBox->addItem( "Lines" );
+            typeBox->addItem( "Column Symbol" );
+            typeBox->setCurrentIndex( typeBox->count() - 1 );
+            typeBox->setSizePolicy( QSizePolicy::Fixed, QSizePolicy::Fixed );
+
+            QToolButton* btnExport = new QToolButton();
+            btnExport->setText( "Export" );
+            btnExport->setToolButtonStyle( Qt::ToolButtonTextUnderIcon );
+            connect( btnExport, SIGNAL(clicked()), plot, SLOT(exportPlot()) );
+
+            QToolBar* toolBar = new QToolBar( this );
+            toolBar->addWidget( typeBox );
+            toolBar->addWidget( btnExport );
+            addToolBar( toolBar );
+
+            plot->setMode( typeBox->currentIndex() );
+            connect( typeBox, SIGNAL(currentIndexChanged(int)),
+                plot, SLOT(setMode(int)) );
+        }
+    };
+}
+
+int main( int argc, char* argv[] )
+{
+    QApplication app( argc, argv );
+
+    MainWindow window;
+
+    window.resize( 600, 400 );
+    window.show();
+
+    return app.exec();
+}

examples/tvplot/tvplot.pro

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+######################################################################
+# Qwt Examples - Copyright (C) 2002 Uwe Rathmann
+# This file may be used under the terms of the 3-clause BSD License
+######################################################################
+
+include( $${PWD}/../examples.pri )
+
+TARGET   = tvplot
+
+SOURCES = \
+    TVPlot.cpp \
+    main.cpp
+
+HEADERS = \
+    TVPlot.h