彻底改版2.0
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feiyangqingyun
231
third/qwtdemo/examples/bode/mainwindow.cpp
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231
third/qwtdemo/examples/bode/mainwindow.cpp
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#include <qregexp.h>
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#include <qtoolbar.h>
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#include <qtoolbutton.h>
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#include <qlabel.h>
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#include <qlayout.h>
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#include <qstatusbar.h>
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#include <qprinter.h>
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#include <qpicture.h>
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#include <qpainter.h>
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#include <qprintdialog.h>
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#include <qwt_counter.h>
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#include <qwt_picker_machine.h>
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#include <qwt_plot_zoomer.h>
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#include <qwt_plot_panner.h>
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#include <qwt_plot_renderer.h>
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#include <qwt_text.h>
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#include <qwt_math.h>
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#include "pixmaps.h"
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#include "plot.h"
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#include "mainwindow.h"
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class Zoomer: public QwtPlotZoomer
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{
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public:
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Zoomer( int xAxis, int yAxis, QWidget *canvas ):
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QwtPlotZoomer( xAxis, yAxis, canvas )
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{
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setTrackerMode( QwtPicker::AlwaysOff );
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setRubberBand( QwtPicker::NoRubberBand );
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// RightButton: zoom out by 1
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// Ctrl+RightButton: zoom out to full size
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setMousePattern( QwtEventPattern::MouseSelect2,
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Qt::RightButton, Qt::ControlModifier );
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setMousePattern( QwtEventPattern::MouseSelect3,
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Qt::RightButton );
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}
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};
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//-----------------------------------------------------------------
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//
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// bode.cpp -- A demo program featuring QwtPlot and QwtCounter
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//
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// This example demonstrates the mapping of different curves
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// to different axes in a QwtPlot widget. It also shows how to
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// display the cursor position and how to implement zooming.
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//
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//-----------------------------------------------------------------
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MainWindow::MainWindow( QWidget *parent ):
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QMainWindow( parent )
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{
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d_plot = new Plot( this );
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const int margin = 5;
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d_plot->setContentsMargins( margin, margin, margin, 0 );
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setContextMenuPolicy( Qt::NoContextMenu );
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d_zoomer[0] = new Zoomer( QwtPlot::xBottom, QwtPlot::yLeft,
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d_plot->canvas() );
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d_zoomer[0]->setRubberBand( QwtPicker::RectRubberBand );
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d_zoomer[0]->setRubberBandPen( QColor( Qt::green ) );
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d_zoomer[0]->setTrackerMode( QwtPicker::ActiveOnly );
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d_zoomer[0]->setTrackerPen( QColor( Qt::white ) );
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d_zoomer[1] = new Zoomer( QwtPlot::xTop, QwtPlot::yRight,
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d_plot->canvas() );
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d_panner = new QwtPlotPanner( d_plot->canvas() );
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d_panner->setMouseButton( Qt::MidButton );
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d_picker = new QwtPlotPicker( QwtPlot::xBottom, QwtPlot::yLeft,
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QwtPlotPicker::CrossRubberBand, QwtPicker::AlwaysOn,
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d_plot->canvas() );
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d_picker->setStateMachine( new QwtPickerDragPointMachine() );
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d_picker->setRubberBandPen( QColor( Qt::green ) );
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d_picker->setRubberBand( QwtPicker::CrossRubberBand );
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d_picker->setTrackerPen( QColor( Qt::white ) );
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setCentralWidget( d_plot );
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QToolBar *toolBar = new QToolBar( this );
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QToolButton *btnZoom = new QToolButton( toolBar );
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btnZoom->setText( "Zoom" );
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btnZoom->setIcon( QPixmap( zoom_xpm ) );
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btnZoom->setCheckable( true );
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btnZoom->setToolButtonStyle( Qt::ToolButtonTextUnderIcon );
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toolBar->addWidget( btnZoom );
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connect( btnZoom, SIGNAL( toggled( bool ) ), SLOT( enableZoomMode( bool ) ) );
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#ifndef QT_NO_PRINTER
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QToolButton *btnPrint = new QToolButton( toolBar );
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btnPrint->setText( "Print" );
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btnPrint->setIcon( QPixmap( print_xpm ) );
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btnPrint->setToolButtonStyle( Qt::ToolButtonTextUnderIcon );
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toolBar->addWidget( btnPrint );
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connect( btnPrint, SIGNAL( clicked() ), SLOT( print() ) );
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#endif
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QToolButton *btnExport = new QToolButton( toolBar );
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btnExport->setText( "Export" );
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btnExport->setIcon( QPixmap( print_xpm ) );
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btnExport->setToolButtonStyle( Qt::ToolButtonTextUnderIcon );
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toolBar->addWidget( btnExport );
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connect( btnExport, SIGNAL( clicked() ), SLOT( exportDocument() ) );
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toolBar->addSeparator();
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QWidget *hBox = new QWidget( toolBar );
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QHBoxLayout *layout = new QHBoxLayout( hBox );
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layout->setSpacing( 0 );
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layout->addWidget( new QWidget( hBox ), 10 ); // spacer
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layout->addWidget( new QLabel( "Damping Factor", hBox ), 0 );
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layout->addSpacing( 10 );
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QwtCounter *cntDamp = new QwtCounter( hBox );
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cntDamp->setRange( 0.0, 5.0 );
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cntDamp->setSingleStep( 0.01 );
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cntDamp->setValue( 0.0 );
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layout->addWidget( cntDamp, 0 );
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( void )toolBar->addWidget( hBox );
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addToolBar( toolBar );
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#ifndef QT_NO_STATUSBAR
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( void )statusBar();
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#endif
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enableZoomMode( false );
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showInfo();
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connect( cntDamp, SIGNAL( valueChanged( double ) ),
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d_plot, SLOT( setDamp( double ) ) );
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connect( d_picker, SIGNAL( moved( const QPoint & ) ),
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SLOT( moved( const QPoint & ) ) );
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connect( d_picker, SIGNAL( selected( const QPolygon & ) ),
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SLOT( selected( const QPolygon & ) ) );
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}
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#ifndef QT_NO_PRINTER
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void MainWindow::print()
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{
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QPrinter printer( QPrinter::HighResolution );
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QString docName = d_plot->title().text();
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if ( !docName.isEmpty() )
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{
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docName.replace ( QRegExp ( QString::fromLatin1 ( "\n" ) ), tr ( " -- " ) );
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printer.setDocName ( docName );
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}
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printer.setCreator( "Bode example" );
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printer.setOrientation( QPrinter::Landscape );
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QPrintDialog dialog( &printer );
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if ( dialog.exec() )
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{
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QwtPlotRenderer renderer;
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if ( printer.colorMode() == QPrinter::GrayScale )
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{
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renderer.setDiscardFlag( QwtPlotRenderer::DiscardBackground );
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renderer.setDiscardFlag( QwtPlotRenderer::DiscardCanvasBackground );
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renderer.setDiscardFlag( QwtPlotRenderer::DiscardCanvasFrame );
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renderer.setLayoutFlag( QwtPlotRenderer::FrameWithScales );
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}
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renderer.renderTo( d_plot, printer );
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}
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}
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#endif
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void MainWindow::exportDocument()
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{
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QwtPlotRenderer renderer;
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renderer.exportTo( d_plot, "bode.pdf" );
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}
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void MainWindow::enableZoomMode( bool on )
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{
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d_panner->setEnabled( on );
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d_zoomer[0]->setEnabled( on );
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d_zoomer[0]->zoom( 0 );
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d_zoomer[1]->setEnabled( on );
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d_zoomer[1]->zoom( 0 );
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d_picker->setEnabled( !on );
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showInfo();
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}
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void MainWindow::showInfo( QString text )
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{
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if ( text == QString::null )
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{
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if ( d_picker->rubberBand() )
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text = "Cursor Pos: Press left mouse button in plot region";
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else
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text = "Zoom: Press mouse button and drag";
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}
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#ifndef QT_NO_STATUSBAR
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statusBar()->showMessage( text );
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#endif
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}
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void MainWindow::moved( const QPoint &pos )
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{
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QString info;
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info.sprintf( "Freq=%g, Ampl=%g, Phase=%g",
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d_plot->invTransform( QwtPlot::xBottom, pos.x() ),
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d_plot->invTransform( QwtPlot::yLeft, pos.y() ),
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d_plot->invTransform( QwtPlot::yRight, pos.y() )
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);
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showInfo( info );
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}
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void MainWindow::selected( const QPolygon & )
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{
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showInfo();
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}
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