Released version 6.1.3
This commit is contained in:
Wodann
commit
a94503cb82
1885 changed files with 276310 additions and 0 deletions
23
examples/bode/bode.pro
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23
examples/bode/bode.pro
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################################################################
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# Qwt Widget Library
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# Copyright (C) 1997 Josef Wilgen
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# Copyright (C) 2002 Uwe Rathmann
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#
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# This library is free software; you can redistribute it and/or
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# modify it under the terms of the Qwt License, Version 1.0
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################################################################
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include( $${PWD}/../examples.pri )
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TARGET = bode
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HEADERS = \
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mainwindow.h \
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plot.h \
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complexnumber.h \
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pixmaps.h
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SOURCES = \
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plot.cpp \
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mainwindow.cpp \
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main.cpp
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83
examples/bode/complexnumber.h
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83
examples/bode/complexnumber.h
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#ifndef _COMPLEX_NUMBER_H_
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#define _COMPLEX_NUMBER_H_
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#include <math.h>
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class ComplexNumber
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{
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public:
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ComplexNumber() ;
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ComplexNumber( double r, double i = 0.0 );
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double real() const;
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double imag() const;
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friend ComplexNumber operator*(
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const ComplexNumber &, const ComplexNumber & );
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|
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friend ComplexNumber operator+(
|
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const ComplexNumber &, const ComplexNumber & );
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friend ComplexNumber operator-(
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const ComplexNumber &, const ComplexNumber & );
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friend ComplexNumber operator/(
|
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const ComplexNumber &, const ComplexNumber & );
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private:
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double d_real;
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double d_imag;
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};
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inline ComplexNumber::ComplexNumber():
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d_real( 0.0 ),
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d_imag( -0.0 )
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{
|
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}
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|
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inline ComplexNumber::ComplexNumber( double re, double im ):
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d_real( re ),
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d_imag( im )
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{
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}
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inline double ComplexNumber::real() const
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{
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return d_real;
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}
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inline double ComplexNumber::imag() const
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{
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return d_imag;
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}
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inline ComplexNumber operator+(
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const ComplexNumber &x1, const ComplexNumber &x2 )
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{
|
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return ComplexNumber( x1.d_real + x2.d_real, x1.d_imag + x2.d_imag );
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}
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inline ComplexNumber operator-(
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const ComplexNumber &x1, const ComplexNumber &x2 )
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{
|
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return ComplexNumber( x1.d_real - x2.d_real, x1.d_imag - x2.d_imag );
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}
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inline ComplexNumber operator*(
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const ComplexNumber &x1, const ComplexNumber &x2 )
|
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{
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return ComplexNumber( x1.d_real * x2.d_real - x1.d_imag * x2.d_imag,
|
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x1.d_real * x2.d_imag + x2.d_real * x1.d_imag );
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}
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|
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inline ComplexNumber operator/(
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const ComplexNumber &x1, const ComplexNumber &x2 )
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{
|
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double denom = x2.d_real * x2.d_real + x2.d_imag * x2.d_imag;
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return ComplexNumber(
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( x1.d_real * x2.d_real + x1.d_imag * x2.d_imag ) / denom,
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( x1.d_imag * x2.d_real - x2.d_imag * x1.d_real ) / denom
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);
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}
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#endif
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13
examples/bode/main.cpp
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13
examples/bode/main.cpp
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#include <qapplication.h>
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#include "mainwindow.h"
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int main ( int argc, char **argv )
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{
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QApplication a( argc, argv );
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MainWindow w;
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w.resize( 540, 400 );
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w.show();
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return a.exec();
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}
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231
examples/bode/mainwindow.cpp
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231
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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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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|
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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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|
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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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|
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enableZoomMode( false );
|
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showInfo();
|
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|
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connect( cntDamp, SIGNAL( valueChanged( double ) ),
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d_plot, SLOT( setDamp( double ) ) );
|
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|
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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 & ) ) );
|
||||
}
|
||||
|
||||
#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();
|
||||
}
|
||||
35
examples/bode/mainwindow.h
Normal file
35
examples/bode/mainwindow.h
Normal file
|
|
@ -0,0 +1,35 @@
|
|||
#include <qmainwindow.h>
|
||||
|
||||
class QwtPlotZoomer;
|
||||
class QwtPlotPicker;
|
||||
class QwtPlotPanner;
|
||||
class Plot;
|
||||
class QPolygon;
|
||||
|
||||
class MainWindow : public QMainWindow
|
||||
{
|
||||
Q_OBJECT
|
||||
|
||||
public:
|
||||
MainWindow( QWidget *parent = 0 );
|
||||
|
||||
private Q_SLOTS:
|
||||
void moved( const QPoint & );
|
||||
void selected( const QPolygon & );
|
||||
|
||||
#ifndef QT_NO_PRINTER
|
||||
void print();
|
||||
#endif
|
||||
|
||||
void exportDocument();
|
||||
void enableZoomMode( bool );
|
||||
|
||||
private:
|
||||
void showInfo( QString text = QString::null );
|
||||
|
||||
Plot *d_plot;
|
||||
|
||||
QwtPlotZoomer *d_zoomer[2];
|
||||
QwtPlotPicker *d_picker;
|
||||
QwtPlotPanner *d_panner;
|
||||
};
|
||||
99
examples/bode/pixmaps.h
Normal file
99
examples/bode/pixmaps.h
Normal file
|
|
@ -0,0 +1,99 @@
|
|||
#ifndef PIXMAPS_H
|
||||
#define PIXMAPS_H
|
||||
|
||||
static const char *print_xpm[] =
|
||||
{
|
||||
"32 32 12 1",
|
||||
"a c #ffffff",
|
||||
"h c #ffff00",
|
||||
"c c #ffffff",
|
||||
"f c #dcdcdc",
|
||||
"b c #c0c0c0",
|
||||
"j c #a0a0a4",
|
||||
"e c #808080",
|
||||
"g c #808000",
|
||||
"d c #585858",
|
||||
"i c #00ff00",
|
||||
"# c #000000",
|
||||
". c None",
|
||||
"................................",
|
||||
"................................",
|
||||
"...........###..................",
|
||||
"..........#abb###...............",
|
||||
".........#aabbbbb###............",
|
||||
".........#ddaaabbbbb###.........",
|
||||
"........#ddddddaaabbbbb###......",
|
||||
".......#deffddddddaaabbbbb###...",
|
||||
"......#deaaabbbddddddaaabbbbb###",
|
||||
".....#deaaaaaaabbbddddddaaabbbb#",
|
||||
"....#deaaabbbaaaa#ddedddfggaaad#",
|
||||
"...#deaaaaaaaaaa#ddeeeeafgggfdd#",
|
||||
"..#deaaabbbaaaa#ddeeeeabbbbgfdd#",
|
||||
".#deeefaaaaaaa#ddeeeeabbhhbbadd#",
|
||||
"#aabbbeeefaaa#ddeeeeabbbbbbaddd#",
|
||||
"#bbaaabbbeee#ddeeeeabbiibbadddd#",
|
||||
"#bbbbbaaabbbeeeeeeabbbbbbaddddd#",
|
||||
"#bjbbbbbbaaabbbbeabbbbbbadddddd#",
|
||||
"#bjjjjbbbbbbaaaeabbbbbbaddddddd#",
|
||||
"#bjaaajjjbbbbbbaaabbbbadddddddd#",
|
||||
"#bbbbbaaajjjbbbbbbaaaaddddddddd#",
|
||||
"#bjbbbbbbaaajjjbbbbbbddddddddd#.",
|
||||
"#bjjjjbbbbbbaaajjjbbbdddddddd#..",
|
||||
"#bjaaajjjbbbbbbjaajjbddddddd#...",
|
||||
"#bbbbbaaajjjbbbjbbaabdddddd#....",
|
||||
"###bbbbbbaaajjjjbbbbbddddd#.....",
|
||||
"...###bbbbbbaaajbbbbbdddd#......",
|
||||
"......###bbbbbbjbbbbbddd#.......",
|
||||
".........###bbbbbbbbbdd#........",
|
||||
"............###bbbbbbd#.........",
|
||||
"...............###bbb#..........",
|
||||
"..................###..........."
|
||||
};
|
||||
|
||||
|
||||
static const char *zoom_xpm[] =
|
||||
{
|
||||
"32 32 8 1",
|
||||
"# c #000000",
|
||||
"b c #c0c0c0",
|
||||
"a c #ffffff",
|
||||
"e c #585858",
|
||||
"d c #a0a0a4",
|
||||
"c c #0000ff",
|
||||
"f c #00ffff",
|
||||
". c None",
|
||||
"..######################........",
|
||||
".#a#baaaaaaaaaaaaaaaaaa#........",
|
||||
"#aa#baaaaaaaaaaaaaccaca#........",
|
||||
"####baaaaaaaaaaaaaaaaca####.....",
|
||||
"#bbbbaaaaaaaaaaaacccaaa#da#.....",
|
||||
"#aaaaaaaaaaaaaaaacccaca#da#.....",
|
||||
"#aaaaaaaaaaaaaaaaaccaca#da#.....",
|
||||
"#aaaaaaaaaabe###ebaaaaa#da#.....",
|
||||
"#aaaaaaaaa#########aaaa#da#.....",
|
||||
"#aaaaaaaa###dbbbb###aaa#da#.....",
|
||||
"#aaaaaaa###aaaaffb###aa#da#.....",
|
||||
"#aaaaaab##aaccaaafb##ba#da#.....",
|
||||
"#aaaaaae#daaccaccaad#ea#da#.....",
|
||||
"#aaaaaa##aaaaaaccaab##a#da#.....",
|
||||
"#aaaaaa##aacccaaaaab##a#da#.....",
|
||||
"#aaaaaa##aaccccaccab##a#da#.....",
|
||||
"#aaaaaae#daccccaccad#ea#da#.....",
|
||||
"#aaaaaab##aacccaaaa##da#da#.....",
|
||||
"#aaccacd###aaaaaaa###da#da#.....",
|
||||
"#aaaaacad###daaad#####a#da#.....",
|
||||
"#acccaaaad##########da##da#.....",
|
||||
"#acccacaaadde###edd#eda#da#.....",
|
||||
"#aaccacaaaabdddddbdd#eda#a#.....",
|
||||
"#aaaaaaaaaaaaaaaaaadd#eda##.....",
|
||||
"#aaaaaaaaaaaaaaaaaaadd#eda#.....",
|
||||
"#aaaaaaaccacaaaaaaaaadd#eda#....",
|
||||
"#aaaaaaaaaacaaaaaaaaaad##eda#...",
|
||||
"#aaaaaacccaaaaaaaaaaaaa#d#eda#..",
|
||||
"########################dd#eda#.",
|
||||
"...#dddddddddddddddddddddd##eda#",
|
||||
"...#aaaaaaaaaaaaaaaaaaaaaa#.####",
|
||||
"...########################..##."
|
||||
};
|
||||
|
||||
#endif
|
||||
190
examples/bode/plot.cpp
Normal file
190
examples/bode/plot.cpp
Normal file
|
|
@ -0,0 +1,190 @@
|
|||
#include <qwt_math.h>
|
||||
#include <qwt_scale_engine.h>
|
||||
#include <qwt_symbol.h>
|
||||
#include <qwt_plot_grid.h>
|
||||
#include <qwt_plot_marker.h>
|
||||
#include <qwt_plot_curve.h>
|
||||
#include <qwt_legend.h>
|
||||
#include <qwt_text.h>
|
||||
#include <qwt_plot_canvas.h>
|
||||
#include <qmath.h>
|
||||
#include "complexnumber.h"
|
||||
#include "plot.h"
|
||||
|
||||
#if QT_VERSION < 0x040601
|
||||
#define qExp(x) ::exp(x)
|
||||
#define qAtan2(y, x) ::atan2(y, x)
|
||||
#endif
|
||||
|
||||
static void logSpace( double *array, int size, double xmin, double xmax )
|
||||
{
|
||||
if ( ( xmin <= 0.0 ) || ( xmax <= 0.0 ) || ( size <= 0 ) )
|
||||
return;
|
||||
|
||||
const int imax = size - 1;
|
||||
|
||||
array[0] = xmin;
|
||||
array[imax] = xmax;
|
||||
|
||||
const double lxmin = log( xmin );
|
||||
const double lxmax = log( xmax );
|
||||
const double lstep = ( lxmax - lxmin ) / double( imax );
|
||||
|
||||
for ( int i = 1; i < imax; i++ )
|
||||
array[i] = qExp( lxmin + double( i ) * lstep );
|
||||
}
|
||||
|
||||
Plot::Plot( QWidget *parent ):
|
||||
QwtPlot( parent )
|
||||
{
|
||||
setAutoReplot( false );
|
||||
|
||||
setTitle( "Frequency Response of a Second-Order System" );
|
||||
|
||||
QwtPlotCanvas *canvas = new QwtPlotCanvas();
|
||||
canvas->setBorderRadius( 10 );
|
||||
|
||||
setCanvas( canvas );
|
||||
setCanvasBackground( QColor( "MidnightBlue" ) );
|
||||
|
||||
// legend
|
||||
QwtLegend *legend = new QwtLegend;
|
||||
insertLegend( legend, QwtPlot::BottomLegend );
|
||||
|
||||
// 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 );
|
||||
|
||||
// axes
|
||||
enableAxis( QwtPlot::yRight );
|
||||
setAxisTitle( QwtPlot::xBottom, "Normalized Frequency" );
|
||||
setAxisTitle( QwtPlot::yLeft, "Amplitude [dB]" );
|
||||
setAxisTitle( QwtPlot::yRight, "Phase [deg]" );
|
||||
|
||||
setAxisMaxMajor( QwtPlot::xBottom, 6 );
|
||||
setAxisMaxMinor( QwtPlot::xBottom, 9 );
|
||||
setAxisScaleEngine( QwtPlot::xBottom, new QwtLogScaleEngine );
|
||||
|
||||
// curves
|
||||
d_curve1 = new QwtPlotCurve( "Amplitude" );
|
||||
d_curve1->setRenderHint( QwtPlotItem::RenderAntialiased );
|
||||
d_curve1->setPen( Qt::yellow );
|
||||
d_curve1->setLegendAttribute( QwtPlotCurve::LegendShowLine );
|
||||
d_curve1->setYAxis( QwtPlot::yLeft );
|
||||
d_curve1->attach( this );
|
||||
|
||||
d_curve2 = new QwtPlotCurve( "Phase" );
|
||||
d_curve2->setRenderHint( QwtPlotItem::RenderAntialiased );
|
||||
d_curve2->setPen( Qt::cyan );
|
||||
d_curve2->setLegendAttribute( QwtPlotCurve::LegendShowLine );
|
||||
d_curve2->setYAxis( QwtPlot::yRight );
|
||||
d_curve2->attach( this );
|
||||
|
||||
// marker
|
||||
d_marker1 = new QwtPlotMarker();
|
||||
d_marker1->setValue( 0.0, 0.0 );
|
||||
d_marker1->setLineStyle( QwtPlotMarker::VLine );
|
||||
d_marker1->setLabelAlignment( Qt::AlignRight | Qt::AlignBottom );
|
||||
d_marker1->setLinePen( Qt::green, 0, Qt::DashDotLine );
|
||||
d_marker1->attach( this );
|
||||
|
||||
d_marker2 = new QwtPlotMarker();
|
||||
d_marker2->setLineStyle( QwtPlotMarker::HLine );
|
||||
d_marker2->setLabelAlignment( Qt::AlignRight | Qt::AlignBottom );
|
||||
d_marker2->setLinePen( QColor( 200, 150, 0 ), 0, Qt::DashDotLine );
|
||||
d_marker2->setSymbol( new QwtSymbol( QwtSymbol::Diamond,
|
||||
QColor( Qt::yellow ), QColor( Qt::green ), QSize( 8, 8 ) ) );
|
||||
d_marker2->attach( this );
|
||||
|
||||
setDamp( 0.0 );
|
||||
|
||||
setAutoReplot( true );
|
||||
}
|
||||
|
||||
void Plot::showData( const double *frequency, const double *amplitude,
|
||||
const double *phase, int count )
|
||||
{
|
||||
d_curve1->setSamples( frequency, amplitude, count );
|
||||
d_curve2->setSamples( frequency, phase, count );
|
||||
}
|
||||
|
||||
void Plot::showPeak( double freq, double amplitude )
|
||||
{
|
||||
QString label;
|
||||
label.sprintf( "Peak: %.3g dB", amplitude );
|
||||
|
||||
QwtText text( label );
|
||||
text.setFont( QFont( "Helvetica", 10, QFont::Bold ) );
|
||||
text.setColor( QColor( 200, 150, 0 ) );
|
||||
|
||||
d_marker2->setValue( freq, amplitude );
|
||||
d_marker2->setLabel( text );
|
||||
}
|
||||
|
||||
void Plot::show3dB( double freq )
|
||||
{
|
||||
QString label;
|
||||
label.sprintf( "-3 dB at f = %.3g", freq );
|
||||
|
||||
QwtText text( label );
|
||||
text.setFont( QFont( "Helvetica", 10, QFont::Bold ) );
|
||||
text.setColor( Qt::green );
|
||||
|
||||
d_marker1->setValue( freq, 0.0 );
|
||||
d_marker1->setLabel( text );
|
||||
}
|
||||
|
||||
//
|
||||
// re-calculate frequency response
|
||||
//
|
||||
void Plot::setDamp( double damping )
|
||||
{
|
||||
const bool doReplot = autoReplot();
|
||||
setAutoReplot( false );
|
||||
|
||||
const int ArraySize = 200;
|
||||
|
||||
double frequency[ArraySize];
|
||||
double amplitude[ArraySize];
|
||||
double phase[ArraySize];
|
||||
|
||||
// build frequency vector with logarithmic division
|
||||
logSpace( frequency, ArraySize, 0.01, 100 );
|
||||
|
||||
int i3 = 1;
|
||||
double fmax = 1;
|
||||
double amax = -1000.0;
|
||||
|
||||
for ( int i = 0; i < ArraySize; i++ )
|
||||
{
|
||||
double f = frequency[i];
|
||||
const ComplexNumber g =
|
||||
ComplexNumber( 1.0 ) / ComplexNumber( 1.0 - f * f, 2.0 * damping * f );
|
||||
|
||||
amplitude[i] = 20.0 * log10( qSqrt( g.real() * g.real() + g.imag() * g.imag() ) );
|
||||
phase[i] = qAtan2( g.imag(), g.real() ) * ( 180.0 / M_PI );
|
||||
|
||||
if ( ( i3 <= 1 ) && ( amplitude[i] < -3.0 ) )
|
||||
i3 = i;
|
||||
if ( amplitude[i] > amax )
|
||||
{
|
||||
amax = amplitude[i];
|
||||
fmax = frequency[i];
|
||||
}
|
||||
|
||||
}
|
||||
|
||||
double f3 = frequency[i3] - ( frequency[i3] - frequency[i3 - 1] )
|
||||
/ ( amplitude[i3] - amplitude[i3 -1] ) * ( amplitude[i3] + 3 );
|
||||
|
||||
showPeak( fmax, amax );
|
||||
show3dB( f3 );
|
||||
showData( frequency, amplitude, phase, ArraySize );
|
||||
|
||||
setAutoReplot( doReplot );
|
||||
|
||||
replot();
|
||||
}
|
||||
31
examples/bode/plot.h
Normal file
31
examples/bode/plot.h
Normal file
|
|
@ -0,0 +1,31 @@
|
|||
#ifndef _PLOT_H_
|
||||
#define _PLOT_H_
|
||||
|
||||
#include <qwt_plot.h>
|
||||
|
||||
class QwtPlotCurve;
|
||||
class QwtPlotMarker;
|
||||
|
||||
class Plot: public QwtPlot
|
||||
{
|
||||
Q_OBJECT
|
||||
|
||||
public:
|
||||
Plot( QWidget *parent );
|
||||
|
||||
public Q_SLOTS:
|
||||
void setDamp( double damping );
|
||||
|
||||
private:
|
||||
void showData( const double *frequency, const double *amplitude,
|
||||
const double *phase, int count );
|
||||
void showPeak( double freq, double amplitude );
|
||||
void show3dB( double freq );
|
||||
|
||||
QwtPlotCurve *d_curve1;
|
||||
QwtPlotCurve *d_curve2;
|
||||
QwtPlotMarker *d_marker1;
|
||||
QwtPlotMarker *d_marker2;
|
||||
};
|
||||
|
||||
#endif
|
||||
Loading…
Add table
Add a link
Reference in a new issue