qt_demoe/third/qwtdemo/examples/bode/mainwindow.cpp

#include <qregexp.h>
#include <qtoolbar.h>
#include <qtoolbutton.h>
#include <qlabel.h>
#include <qlayout.h>
#include <qstatusbar.h>
#include <qprinter.h>
#include <qpicture.h>
#include <qpainter.h>
#include <qprintdialog.h>
#include <qwt_counter.h>
#include <qwt_picker_machine.h>
#include <qwt_plot_zoomer.h>
#include <qwt_plot_panner.h>
#include <qwt_plot_renderer.h>
#include <qwt_text.h>
#include <qwt_math.h>
#include "pixmaps.h"
#include "plot.h"
#include "mainwindow.h"

class Zoomer: public QwtPlotZoomer
{
public:
    Zoomer( int xAxis, int yAxis, QWidget *canvas ):
        QwtPlotZoomer( xAxis, yAxis, canvas )
    {
        setTrackerMode( QwtPicker::AlwaysOff );
        setRubberBand( QwtPicker::NoRubberBand );

        // RightButton: zoom out by 1
        // Ctrl+RightButton: zoom out to full size

        setMousePattern( QwtEventPattern::MouseSelect2,
            Qt::RightButton, Qt::ControlModifier );
        setMousePattern( QwtEventPattern::MouseSelect3,
            Qt::RightButton );
    }
};

//-----------------------------------------------------------------
//
//      bode.cpp -- A demo program featuring QwtPlot and QwtCounter
//
//      This example demonstrates the mapping of different curves
//      to different axes in a QwtPlot widget. It also shows how to
//      display the cursor position and how to implement zooming.
//
//-----------------------------------------------------------------

MainWindow::MainWindow( QWidget *parent ):
    QMainWindow( parent )
{
    d_plot = new Plot( this );

    const int margin = 5;
    d_plot->setContentsMargins( margin, margin, margin, 0 );

    setContextMenuPolicy( Qt::NoContextMenu );

    d_zoomer[0] = new Zoomer( QwtPlot::xBottom, QwtPlot::yLeft,
        d_plot->canvas() );
    d_zoomer[0]->setRubberBand( QwtPicker::RectRubberBand );
    d_zoomer[0]->setRubberBandPen( QColor( Qt::green ) );
    d_zoomer[0]->setTrackerMode( QwtPicker::ActiveOnly );
    d_zoomer[0]->setTrackerPen( QColor( Qt::white ) );

    d_zoomer[1] = new Zoomer( QwtPlot::xTop, QwtPlot::yRight,
         d_plot->canvas() );

    d_panner = new QwtPlotPanner( d_plot->canvas() );
    d_panner->setMouseButton( Qt::MidButton );

    d_picker = new QwtPlotPicker( QwtPlot::xBottom, QwtPlot::yLeft,
        QwtPlotPicker::CrossRubberBand, QwtPicker::AlwaysOn,
        d_plot->canvas() );
    d_picker->setStateMachine( new QwtPickerDragPointMachine() );
    d_picker->setRubberBandPen( QColor( Qt::green ) );
    d_picker->setRubberBand( QwtPicker::CrossRubberBand );
    d_picker->setTrackerPen( QColor( Qt::white ) );

    setCentralWidget( d_plot );

    QToolBar *toolBar = new QToolBar( this );

    QToolButton *btnZoom = new QToolButton( toolBar );
    btnZoom->setText( "Zoom" );
    btnZoom->setIcon( QPixmap( zoom_xpm ) );
    btnZoom->setCheckable( true );
    btnZoom->setToolButtonStyle( Qt::ToolButtonTextUnderIcon );
    toolBar->addWidget( btnZoom );
    connect( btnZoom, SIGNAL( toggled( bool ) ), SLOT( enableZoomMode( bool ) ) );

#ifndef QT_NO_PRINTER
    QToolButton *btnPrint = new QToolButton( toolBar );
    btnPrint->setText( "Print" );
    btnPrint->setIcon( QPixmap( print_xpm ) );
    btnPrint->setToolButtonStyle( Qt::ToolButtonTextUnderIcon );
    toolBar->addWidget( btnPrint );
    connect( btnPrint, SIGNAL( clicked() ), SLOT( print() ) );
#endif

    QToolButton *btnExport = new QToolButton( toolBar );
    btnExport->setText( "Export" );
    btnExport->setIcon( QPixmap( print_xpm ) );
    btnExport->setToolButtonStyle( Qt::ToolButtonTextUnderIcon );
    toolBar->addWidget( btnExport );
    connect( btnExport, SIGNAL( clicked() ), SLOT( exportDocument() ) );

    toolBar->addSeparator();

    QWidget *hBox = new QWidget( toolBar );

    QHBoxLayout *layout = new QHBoxLayout( hBox );
    layout->setSpacing( 0 );
    layout->addWidget( new QWidget( hBox ), 10 ); // spacer
    layout->addWidget( new QLabel( "Damping Factor", hBox ), 0 );
    layout->addSpacing( 10 );

    QwtCounter *cntDamp = new QwtCounter( hBox );
    cntDamp->setRange( 0.0, 5.0 );
    cntDamp->setSingleStep( 0.01 );
    cntDamp->setValue( 0.0 );

    layout->addWidget( cntDamp, 0 );

    ( void )toolBar->addWidget( hBox );

    addToolBar( toolBar );
#ifndef QT_NO_STATUSBAR
    ( void )statusBar();
#endif

    enableZoomMode( false );
    showInfo();

    connect( cntDamp, SIGNAL( valueChanged( double ) ),
        d_plot, SLOT( setDamp( double ) ) );

    connect( d_picker, SIGNAL( moved( const QPoint & ) ),
        SLOT( moved( const QPoint & ) ) );
    connect( d_picker, SIGNAL( selected( const QPolygon & ) ),
        SLOT( selected( const QPolygon & ) ) );
}

#ifndef QT_NO_PRINTER

void MainWindow::print()
{
    QPrinter printer( QPrinter::HighResolution );

    QString docName = d_plot->title().text();
    if ( !docName.isEmpty() )
    {
        docName.replace ( QRegExp ( QString::fromLatin1 ( "\n" ) ), tr ( " -- " ) );
        printer.setDocName ( docName );
    }

    printer.setCreator( "Bode example" );
    printer.setOrientation( QPrinter::Landscape );

    QPrintDialog dialog( &printer );
    if ( dialog.exec() )
    {
        QwtPlotRenderer renderer;

        if ( printer.colorMode() == QPrinter::GrayScale )
        {
            renderer.setDiscardFlag( QwtPlotRenderer::DiscardBackground );
            renderer.setDiscardFlag( QwtPlotRenderer::DiscardCanvasBackground );
            renderer.setDiscardFlag( QwtPlotRenderer::DiscardCanvasFrame );
            renderer.setLayoutFlag( QwtPlotRenderer::FrameWithScales );
        }

        renderer.renderTo( d_plot, printer );
    }
}

#endif

void MainWindow::exportDocument()
{
    QwtPlotRenderer renderer;
    renderer.exportTo( d_plot, "bode.pdf" );
}

void MainWindow::enableZoomMode( bool on )
{
    d_panner->setEnabled( on );

    d_zoomer[0]->setEnabled( on );
    d_zoomer[0]->zoom( 0 );

    d_zoomer[1]->setEnabled( on );
    d_zoomer[1]->zoom( 0 );

    d_picker->setEnabled( !on );

    showInfo();
}

void MainWindow::showInfo( QString text )
{
    if ( text == QString::null )
    {
        if ( d_picker->rubberBand() )
            text = "Cursor Pos: Press left mouse button in plot region";
        else
            text = "Zoom: Press mouse button and drag";
    }

#ifndef QT_NO_STATUSBAR
    statusBar()->showMessage( text );
#endif
}

void MainWindow::moved( const QPoint &pos )
{
    QString info;
    info.sprintf( "Freq=%g, Ampl=%g, Phase=%g",
        d_plot->invTransform( QwtPlot::xBottom, pos.x() ),
        d_plot->invTransform( QwtPlot::yLeft, pos.y() ),
        d_plot->invTransform( QwtPlot::yRight, pos.y() )
    );
    showInfo( info );
}

void MainWindow::selected( const QPolygon & )
{
    showInfo();
}