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examples/animation/Plot.cpp

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+/*****************************************************************************
+ * Qwt Examples
+ * Copyright (C) 1997   Josef Wilgen
+ * Copyright (C) 2002   Uwe Rathmann
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the Qwt License, Version 1.0
+ *****************************************************************************/
+
+#include "Plot.h"
+
+#include <QwtMath>
+#include <QwtSymbol>
+#include <QwtPlotCurve>
+#include <QwtPlotLayout>
+
+class Curve : public QwtPlotCurve
+{
+  public:
+    void setTransformation( const QTransform& transform )
+    {
+        m_transform = transform;
+    }
+
+    virtual void updateSamples( double phase )
+    {
+        setSamples( m_transform.map( points( phase ) ) );
+    }
+
+  private:
+    virtual QPolygonF points( double phase ) const = 0;
+
+  private:
+    QTransform m_transform;
+};
+
+class Curve1 : public Curve
+{
+  public:
+    Curve1()
+    {
+        setPen( QColor( 150, 150, 200 ), 2 );
+        setStyle( QwtPlotCurve::Lines );
+
+        setCurveAttribute( QwtPlotCurve::Fitted, true );
+
+        QwtSymbol* symbol = new QwtSymbol( QwtSymbol::XCross );
+        symbol->setPen( Qt::yellow );
+        symbol->setSize( 7 );
+
+        setSymbol( symbol );
+
+        // somewhere to the left
+        QTransform transform;
+        transform.scale( 1.5, 1.0 );
+        transform.translate( 1.5, 3.0 );
+
+        setTransformation( transform );
+    }
+
+    virtual QPolygonF points( double phase ) const QWT_OVERRIDE
+    {
+        QPolygonF points;
+
+        const int numSamples = 15;
+        for ( int i = 0; i < numSamples; i++ )
+        {
+            const double v = 6.28 * double( i ) / double( numSamples - 1 );
+            points += QPointF( std::sin( v - phase ), v );
+        }
+
+        return points;
+    }
+};
+
+class Curve2 : public Curve
+{
+  public:
+    Curve2()
+    {
+        setStyle( QwtPlotCurve::Sticks );
+        setPen( QColor( 200, 150, 50 ) );
+
+        setSymbol( new QwtSymbol( QwtSymbol::Ellipse,
+            QColor( Qt::gray ), QColor( Qt::yellow ), QSize( 5, 5 ) ) );
+    }
+
+  private:
+    virtual QPolygonF points( double phase ) const QWT_OVERRIDE
+    {
+        QPolygonF points;
+
+        const int numSamples = 50;
+        for ( int i = 0; i < numSamples; i++ )
+        {
+            const double v = 10.0 * i / double( numSamples - 1 );
+            points += QPointF( v, std::cos( 3.0 * ( v + phase ) ) );
+        }
+
+        return points;
+    }
+};
+
+class Curve3 : public Curve
+{
+  public:
+    Curve3()
+    {
+        setStyle( QwtPlotCurve::Lines );
+        setPen( QColor( 100, 200, 150 ), 2 );
+
+        setCurveAttribute( QwtPlotCurve::Fitted, true );
+
+        // somewhere in the top right corner
+        QTransform transform;
+        transform.translate( 7.0, 7.5 );
+        transform.scale( 2.0, 2.0 );
+
+        setTransformation( transform );
+    }
+
+  private:
+    virtual QPolygonF points( double phase ) const QWT_OVERRIDE
+    {
+        QPolygonF points;
+
+        const int numSamples = 9;
+        for ( int i = 0; i < numSamples; i++ )
+        {
+            const double v = i * 2.0 * M_PI / ( numSamples - 1 );
+            points += QPointF( std::sin( v - phase ), std::cos( 3.0 * ( v + phase ) ) );
+        }
+
+        return points;
+    }
+};
+
+class Curve4 : public Curve
+{
+  public:
+    Curve4()
+    {
+        setStyle( QwtPlotCurve::Lines );
+        setPen( Qt::red, 2 );
+
+        initSamples();
+
+        // somewhere in the center
+        QTransform transform;
+        transform.translate( 7.0, 3.0 );
+        transform.scale( 1.5, 1.5 );
+
+        setTransformation( transform );
+    }
+
+  private:
+    virtual QPolygonF points( double phase ) const QWT_OVERRIDE
+    {
+        const double speed = 0.05;
+
+        const double s = speed * std::sin( phase );
+        const double c = std::sqrt( 1.0 - s * s );
+
+        for ( int i = 0; i < m_points.size(); i++ )
+        {
+            const QPointF p = m_points[i];
+
+            const double u = p.x();
+            const double v = p.y();
+
+            m_points[i].setX( u * c - v * s );
+            m_points[i].setY( v * c + u * s );
+        }
+
+        return m_points;
+    }
+
+    void initSamples()
+    {
+        const int numSamples = 15;
+
+        for ( int i = 0; i < numSamples; i++ )
+        {
+            const double angle = i * ( 2.0 * M_PI / ( numSamples - 1 ) );
+
+            QPointF p( std::cos( angle ), std::sin( angle ) );
+            if ( i % 2 )
+                p *= 0.4;
+
+            m_points += p;
+        }
+    }
+
+  private:
+    mutable QPolygonF m_points;
+};
+
+Plot::Plot( QWidget* parent )
+    : QwtPlot( parent)
+{
+    setAutoReplot( false );
+
+    setTitle( "Animated Curves" );
+
+    // hide all axes
+    for ( int axisPos = 0; axisPos < QwtAxis::AxisPositions; axisPos++ )
+        setAxisVisible( axisPos, false );
+
+    plotLayout()->setCanvasMargin( 10 );
+
+    Curve* curve1 = new Curve1();
+    curve1->attach( this );
+
+    Curve* curve2 = new Curve2();
+    curve2->attach( this );
+
+    Curve* curve3 = new Curve3();
+    curve3->attach( this );
+
+    Curve* curve4 = new Curve4();
+    curve4->attach( this );
+
+    updateCurves();
+
+    m_timer.start();
+    ( void )startTimer( 40 );
+}
+
+void Plot::timerEvent( QTimerEvent* )
+{
+    updateCurves();
+    replot();
+}
+
+void Plot::updateCurves()
+{
+    const double speed = 2 * M_PI / 25000.0; // a cycle every 25 seconds
+    const double phase = m_timer.elapsed() * speed;
+
+    const QwtPlotItemList& items = itemList();
+    for ( QwtPlotItemIterator it = items.constBegin();
+        it != items.constEnd(); ++it )
+    {
+        QwtPlotItem* item = *it;
+
+        if ( item->rtti() == QwtPlotItem::Rtti_PlotCurve )
+        {
+            Curve* curve = dynamic_cast< Curve* >( item );
+            curve->updateSamples( phase );
+        }
+    }
+}