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playground/rescaler/MainWindow.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 "MainWindow.h"
+#include "Plot.h"
+
+#include <QwtPlot>
+#include <QwtPlotRescaler>
+#include <QwtInterval>
+
+#include <QGroupBox>
+#include <QComboBox>
+#include <QLayout>
+#include <QStatusBar>
+#include <QLabel>
+
+MainWindow::MainWindow()
+{
+    QFrame* w = new QFrame( this );
+
+    QWidget* panel = createPanel( w );
+    panel->setFixedWidth( 2 * panel->sizeHint().width() );
+    m_plot = createPlot( w );
+
+    QHBoxLayout* layout = new QHBoxLayout( w );
+    layout->setContentsMargins( QMargins() );
+    layout->addWidget( panel, 0 );
+    layout->addWidget( m_plot, 10 );
+
+    setCentralWidget( w );
+
+    setRescaleMode( 0 );
+
+    ( void )statusBar();
+}
+
+QWidget* MainWindow::createPanel( QWidget* parent )
+{
+    QGroupBox* panel = new QGroupBox( "Navigation Panel", parent );
+
+    QComboBox* rescaleBox = new QComboBox( panel );
+    rescaleBox->setEditable( false );
+    rescaleBox->insertItem( KeepScales, "None" );
+    rescaleBox->insertItem( Fixed, "Fixed" );
+    rescaleBox->insertItem( Expanding, "Expanding" );
+    rescaleBox->insertItem( Fitting, "Fitting" );
+
+    connect( rescaleBox, SIGNAL(activated(int)), SLOT(setRescaleMode(int)) );
+
+    m_rescaleInfo = new QLabel( panel );
+    m_rescaleInfo->setSizePolicy(
+        QSizePolicy::Expanding, QSizePolicy::Expanding );
+    m_rescaleInfo->setWordWrap( true );
+
+    QVBoxLayout* layout = new QVBoxLayout( panel );
+    layout->addWidget( rescaleBox );
+    layout->addWidget( m_rescaleInfo );
+    layout->addStretch( 10 );
+
+    return panel;
+}
+
+Plot* MainWindow::createPlot( QWidget* parent )
+{
+    Plot* plot = new Plot( parent, QwtInterval( 0.0, 1000.0 ) );
+    plot->replot();
+
+    m_rescaler = new QwtPlotRescaler( plot->canvas() );
+    m_rescaler->setReferenceAxis( QwtAxis::XBottom );
+    m_rescaler->setAspectRatio( QwtAxis::YLeft, 1.0 );
+    m_rescaler->setAspectRatio( QwtAxis::YRight, 0.0 );
+    m_rescaler->setAspectRatio( QwtAxis::XTop, 0.0 );
+
+    for ( int axisPos = 0; axisPos < QwtAxis::AxisPositions; axisPos++ )
+        m_rescaler->setIntervalHint( axisPos, QwtInterval( 0.0, 1000.0 ) );
+
+    connect( plot, SIGNAL(resized(double,double)),
+        SLOT(showRatio(double,double)) );
+    return plot;
+}
+
+void MainWindow::setRescaleMode( int mode )
+{
+    bool doEnable = true;
+    QString info;
+    QRectF rectOfInterest;
+    QwtPlotRescaler::ExpandingDirection direction = QwtPlotRescaler::ExpandUp;
+
+    switch( mode )
+    {
+        case KeepScales:
+        {
+            doEnable = false;
+            info = "All scales remain unchanged, when the plot is resized";
+            break;
+        }
+        case Fixed:
+        {
+            m_rescaler->setRescalePolicy( QwtPlotRescaler::Fixed );
+            info = "The scale of the bottom axis remains unchanged, "
+                "when the plot is resized. All other scales are changed, "
+                "so that a pixel on screen means the same distance for"
+                "all scales.";
+            break;
+        }
+        case Expanding:
+        {
+            m_rescaler->setRescalePolicy( QwtPlotRescaler::Expanding );
+            info = "The scales of all axis are shrinked/expanded, when "
+                "resizing the plot, keeping the distance that is represented "
+                "by one pixel.";
+            m_rescaleInfo->setText( "Expanding" );
+            break;
+        }
+        case Fitting:
+        {
+            m_rescaler->setRescalePolicy( QwtPlotRescaler::Fitting );
+            const QwtInterval xIntv =
+                m_rescaler->intervalHint( QwtAxis::XBottom );
+            const QwtInterval yIntv =
+                m_rescaler->intervalHint( QwtAxis::YLeft );
+
+            rectOfInterest = QRectF( xIntv.minValue(), yIntv.minValue(),
+                xIntv.width(), yIntv.width() );
+            direction = QwtPlotRescaler::ExpandBoth;
+
+            info = "Fitting";
+            break;
+        }
+    }
+
+    m_plot->setRectOfInterest( rectOfInterest );
+
+    m_rescaleInfo->setText( info );
+    m_rescaler->setEnabled( doEnable );
+    for ( int axisPos = 0; axisPos < QwtAxis::AxisPositions; axisPos++ )
+        m_rescaler->setExpandingDirection( direction );
+
+    if ( doEnable )
+        m_rescaler->rescale();
+    else
+        m_plot->replot();
+}
+
+void MainWindow::showRatio( double xRatio, double yRatio )
+{
+    const QString msg = QString( "%1, %2" ).arg( xRatio ).arg( yRatio );
+    statusBar()->showMessage( msg );
+}
+
+#include "moc_MainWindow.cpp"

playground/rescaler/MainWindow.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 <QMainWindow>
+
+class QwtPlotRescaler;
+class QLabel;
+class Plot;
+
+class MainWindow : public QMainWindow
+{
+    Q_OBJECT
+
+  public:
+    enum RescaleMode
+    {
+        KeepScales,
+        Fixed,
+        Expanding,
+        Fitting
+    };
+
+    MainWindow();
+
+  private Q_SLOTS:
+    void setRescaleMode( int );
+    void showRatio( double, double );
+
+  private:
+    QWidget* createPanel( QWidget* );
+    Plot* createPlot( QWidget* );
+
+    QwtPlotRescaler* m_rescaler;
+    QLabel* m_rescaleInfo;
+
+    Plot* m_plot;
+};

playground/rescaler/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 <QwtPlotGrid>
+#include <QwtPlotItem>
+#include <QwtScaleMap>
+#include <QwtPlotLayout>
+#include <QwtInterval>
+#include <QwtPainter>
+#include <QwtMath>
+
+#include <QPainter>
+
+class TextItem : public QwtPlotItem
+{
+  public:
+    void setText( const QString& text )
+    {
+        m_text = text;
+    }
+
+    virtual void draw( QPainter* painter,
+        const QwtScaleMap&, const QwtScaleMap&,
+        const QRectF& canvasRect ) const QWT_OVERRIDE
+    {
+        const int margin = 5;
+        const QRectF textRect =
+            canvasRect.adjusted( margin, margin, -margin, -margin );
+
+        painter->setPen( Qt::white );
+        painter->drawText( textRect,
+            Qt::AlignBottom | Qt::AlignRight, m_text );
+    }
+
+  private:
+    QString m_text;
+};
+
+// RectItem shows how to implement a simple plot item,
+// what wouldn't be necessary as QwtPlotShapeItem
+// would do the same
+
+class RectItem : public QwtPlotItem
+{
+  public:
+    enum Type
+    {
+        Rect,
+        Ellipse
+    };
+
+    explicit RectItem( Type type )
+        : m_type( type )
+    {
+    }
+
+    void setPen( const QPen& pen )
+    {
+        if ( pen != m_pen )
+        {
+            m_pen = pen;
+            itemChanged();
+        }
+    }
+
+    void setBrush( const QBrush& brush )
+    {
+        if ( brush != m_brush )
+        {
+            m_brush = brush;
+            itemChanged();
+        }
+    }
+    void setRect( const QRectF& rect )
+    {
+        if ( m_rect != rect )
+        {
+            m_rect = rect;
+            itemChanged();
+        }
+    }
+
+    virtual QRectF boundingRect() const QWT_OVERRIDE
+    {
+        return m_rect;
+    }
+
+    virtual void draw( QPainter* painter,
+        const QwtScaleMap& xMap, const QwtScaleMap& yMap,
+        const QRectF& ) const QWT_OVERRIDE
+    {
+        if ( m_rect.isValid() )
+        {
+            const QRectF rect = QwtScaleMap::transform(
+                xMap, yMap, m_rect );
+
+            painter->setPen( m_pen );
+            painter->setBrush( m_brush );
+
+            if ( m_type == Ellipse )
+                QwtPainter::drawEllipse( painter, rect );
+            else
+                QwtPainter::drawRect( painter, rect );
+        }
+    }
+
+  private:
+    QPen m_pen;
+    QBrush m_brush;
+    QRectF m_rect;
+    Type m_type;
+};
+
+Plot::Plot( QWidget* parent, const QwtInterval& interval )
+    : QwtPlot( parent )
+{
+    for ( int axisPos = 0; axisPos < QwtAxis::AxisPositions; axisPos++ )
+        setAxisScale( axisPos, interval.minValue(), interval.maxValue() );
+
+    setCanvasBackground( QColor( Qt::darkBlue ) );
+    plotLayout()->setAlignCanvasToScales( true );
+
+    // grid
+    QwtPlotGrid* grid = new QwtPlotGrid;
+    //grid->enableXMin(true);
+    grid->setMajorPen( Qt::white, 0, Qt::DotLine );
+    grid->setMinorPen( Qt::gray, 0, Qt::DotLine );
+    grid->attach( this );
+
+    const int numEllipses = 10;
+
+    for ( int i = 0; i < numEllipses; i++ )
+    {
+        const double x = interval.minValue() +
+            qwtRand() % qRound( interval.width() );
+        const double y = interval.minValue() +
+            qwtRand() % qRound( interval.width() );
+        const double r = interval.minValue() +
+            qwtRand() % qRound( interval.width() / 6 );
+
+        const QRectF area( x - r, y - r, 2 * r, 2 * r );
+
+        RectItem* item = new RectItem( RectItem::Ellipse );
+        item->setRenderHint( QwtPlotItem::RenderAntialiased, true );
+        item->setRect( area );
+        item->setPen( QPen( Qt::yellow ) );
+        item->attach( this );
+    }
+
+    TextItem* textItem = new TextItem();
+    textItem->setText( "Navigation Example" );
+    textItem->attach( this );
+
+    m_rectItem = new RectItem( RectItem::Rect );
+    m_rectItem->setPen( Qt::NoPen );
+    QColor c = Qt::gray;
+    c.setAlpha( 100 );
+    m_rectItem->setBrush( QBrush( c ) );
+    m_rectItem->attach( this );
+}
+
+void Plot::updateLayout()
+{
+    QwtPlot::updateLayout();
+
+    const QwtScaleMap xMap = canvasMap( QwtAxis::XBottom );
+    const QwtScaleMap yMap = canvasMap( QwtAxis::YLeft );
+
+    const QRect cr = canvas()->contentsRect();
+    const double x1 = xMap.invTransform( cr.left() );
+    const double x2 = xMap.invTransform( cr.right() );
+    const double y1 = yMap.invTransform( cr.bottom() );
+    const double y2 = yMap.invTransform( cr.top() );
+
+    const double xRatio = ( x2 - x1 ) / cr.width();
+    const double yRatio = ( y2 - y1 ) / cr.height();
+
+    Q_EMIT resized( xRatio, yRatio );
+}
+
+void Plot::setRectOfInterest( const QRectF& rect )
+{
+    m_rectItem->setRect( rect );
+}
+
+#include "moc_Plot.cpp"

playground/rescaler/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 RectItem;
+class QwtInterval;
+
+class Plot : public QwtPlot
+{
+    Q_OBJECT
+
+  public:
+    Plot( QWidget* parent, const QwtInterval& );
+    virtual void updateLayout() QWT_OVERRIDE;
+
+    void setRectOfInterest( const QRectF& );
+
+  Q_SIGNALS:
+    void resized( double xRatio, double yRatio );
+
+  private:
+    RectItem* m_rectItem;
+};

playground/rescaler/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 "MainWindow.h"
+#include <QApplication>
+
+int main( int argc, char* argv[] )
+{
+    QApplication app( argc, argv );
+
+    MainWindow window;
+
+    window.resize( 800, 600 );
+    window.show();
+
+    return app.exec();
+}
+

playground/rescaler/rescaler.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}/../playground.pri )
+
+TARGET       = rescaler
+
+HEADERS = \
+    MainWindow.h \
+    Plot.h 
+
+SOURCES = \
+    MainWindow.cpp \
+    Plot.cpp \
+    main.cpp
+