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examples/scatterplot/Plot.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 "Plot.h"
+
+#include <QwtPlotMagnifier>
+#include <QwtPlotPanner>
+#include <QwtPlotPicker>
+#include <QwtPickerMachine>
+#include <QwtPlotCurve>
+#include <QwtText>
+
+#include <QPen>
+
+namespace
+{
+    class DistancePicker : public QwtPlotPicker
+    {
+      public:
+        DistancePicker( QWidget* canvas )
+            : QwtPlotPicker( canvas )
+        {
+            setTrackerMode( QwtPicker::ActiveOnly );
+            setStateMachine( new QwtPickerDragLineMachine() );
+            setRubberBand( QwtPlotPicker::PolygonRubberBand );
+        }
+
+        virtual QwtText trackerTextF( const QPointF& pos ) const QWT_OVERRIDE
+        {
+            QwtText text;
+
+            const QPolygon points = selection();
+            if ( !points.isEmpty() )
+            {
+                QString num;
+                num.setNum( QLineF( pos, invTransform( points[0] ) ).length() );
+
+                QColor bg( Qt::white );
+                bg.setAlpha( 200 );
+
+                text.setBackgroundBrush( QBrush( bg ) );
+                text.setText( num );
+            }
+            return text;
+        }
+    };
+}
+
+Plot::Plot( QWidget* parent )
+    : QwtPlot( parent )
+    , m_curve( NULL )
+{
+    canvas()->setStyleSheet(
+        "border: 2px solid Black;"
+        "border-radius: 15px;"
+        "background-color: qlineargradient( x1: 0, y1: 0, x2: 0, y2: 1,"
+            "stop: 0 LemonChiffon, stop: 1 PaleGoldenrod );"
+    );
+
+    // attach curve
+    m_curve = new QwtPlotCurve( "Scattered Points" );
+    m_curve->setPen( QColor( "Purple" ) );
+
+    // when using QwtPlotCurve::ImageBuffer simple dots can be
+    // rendered in parallel on multicore systems.
+    m_curve->setRenderThreadCount( 0 ); // 0: use QThread::idealThreadCount()
+
+    m_curve->attach( this );
+
+    setSymbol( NULL );
+
+    // panning with the left mouse button
+    (void )new QwtPlotPanner( canvas() );
+
+    // zoom in/out with the wheel
+    QwtPlotMagnifier* magnifier = new QwtPlotMagnifier( canvas() );
+    magnifier->setMouseButton( Qt::NoButton );
+
+    // distanve measurement with the right mouse button
+    DistancePicker* picker = new DistancePicker( canvas() );
+    picker->setMousePattern( QwtPlotPicker::MouseSelect1, Qt::RightButton );
+    picker->setRubberBandPen( QPen( Qt::blue ) );
+}
+
+void Plot::setSymbol( QwtSymbol* symbol )
+{
+    m_curve->setSymbol( symbol );
+
+    if ( symbol == NULL )
+    {
+        m_curve->setStyle( QwtPlotCurve::Dots );
+    }
+}
+
+void Plot::setSamples( const QVector< QPointF >& samples )
+{
+    m_curve->setPaintAttribute(
+        QwtPlotCurve::ImageBuffer, samples.size() > 1000 );
+
+    m_curve->setSamples( samples );
+}
+
+#include "moc_Plot.cpp"

examples/scatterplot/Plot.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 QwtPlotCurve;
+class QwtSymbol;
+
+class Plot : public QwtPlot
+{
+    Q_OBJECT
+
+  public:
+    Plot( QWidget* parent = NULL );
+
+    void setSymbol( QwtSymbol* );
+    void setSamples( const QVector< QPointF >& samples );
+
+  private:
+    QwtPlotCurve* m_curve;
+};

examples/scatterplot/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 "Plot.h"
+
+#include <QwtMath>
+#include <QApplication>
+
+static inline double randomValue()
+{
+    // a number between [ 0.0, 1.0 ]
+    return ( qwtRand() % 100000 ) / 100000.0;
+}
+
+class ScatterPlot : public Plot
+{
+  public:
+    ScatterPlot()
+    {
+        setTitle( "Scatter Plot" );
+
+        // a million points
+
+        const int numPoints = 100000;
+
+        QPolygonF samples;
+        samples.reserve( numPoints );
+
+        for ( int i = 0; i < numPoints; i++ )
+        {
+            const double x = randomValue() * 24.0 + 1.0;
+            const double y = std::log( 10.0 * ( x - 1.0 ) + 1.0 )
+                * ( randomValue() * 0.5 + 0.9 );
+
+            samples += QPointF( x, y );
+        }
+
+        setSamples( samples );
+    }
+};
+
+int main( int argc, char* argv[] )
+{
+    QApplication app( argc, argv );
+
+    ScatterPlot plot;
+    plot.resize( 800, 600 );
+    plot.show();
+
+    return app.exec();
+}

examples/scatterplot/scatterplot.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       = scatterplot
+
+HEADERS = \
+    Plot.h
+
+SOURCES = \
+    Plot.cpp \
+    main.cpp
+