1 #include <cstdlib>
2 #include <qgroupbox.h>
3 #include <qcombobox.h>
4 #include <qlayout.h>
5 #include <qstatusbar.h>
6 #include <qlabel.h>
7 #include <qwt_plot.h>
8 #include <qwt_plot_rescaler.h>
9 #include <qwt_scale_div.h>
10 #include "plot.h"
11 #include "mainwindow.h"
12
MainWindow()13 MainWindow::MainWindow()
14 {
15 QFrame *w = new QFrame( this );
16
17 QWidget *panel = createPanel( w );
18 panel->setFixedWidth( 2 * panel->sizeHint().width() );
19 d_plot = createPlot( w );
20
21 QHBoxLayout *layout = new QHBoxLayout( w );
22 layout->setMargin( 0 );
23 layout->addWidget( panel, 0 );
24 layout->addWidget( d_plot, 10 );
25
26 setCentralWidget( w );
27
28 setRescaleMode( 0 );
29
30 ( void )statusBar();
31 }
32
createPanel(QWidget * parent)33 QWidget *MainWindow::createPanel( QWidget *parent )
34 {
35 QGroupBox *panel = new QGroupBox( "Navigation Panel", parent );
36
37 QComboBox *rescaleBox = new QComboBox( panel );
38 rescaleBox->setEditable( false );
39 rescaleBox->insertItem( KeepScales, "None" );
40 rescaleBox->insertItem( Fixed, "Fixed" );
41 rescaleBox->insertItem( Expanding, "Expanding" );
42 rescaleBox->insertItem( Fitting, "Fitting" );
43
44 connect( rescaleBox, SIGNAL( activated( int ) ), SLOT( setRescaleMode( int ) ) );
45
46 d_rescaleInfo = new QLabel( panel );
47 d_rescaleInfo->setSizePolicy(
48 QSizePolicy::Expanding, QSizePolicy::Expanding );
49 d_rescaleInfo->setWordWrap( true );
50
51 QVBoxLayout *layout = new QVBoxLayout( panel );
52 layout->addWidget( rescaleBox );
53 layout->addWidget( d_rescaleInfo );
54 layout->addStretch( 10 );
55
56 return panel;
57 }
58
createPlot(QWidget * parent)59 Plot *MainWindow::createPlot( QWidget *parent )
60 {
61 Plot *plot = new Plot( parent, QwtInterval( 0.0, 1000.0 ) );
62 plot->replot();
63
64 d_rescaler = new QwtPlotRescaler( plot->canvas() );
65 d_rescaler->setReferenceAxis( QwtPlot::xBottom );
66 d_rescaler->setAspectRatio( QwtPlot::yLeft, 1.0 );
67 d_rescaler->setAspectRatio( QwtPlot::yRight, 0.0 );
68 d_rescaler->setAspectRatio( QwtPlot::xTop, 0.0 );
69
70 for ( int axis = 0; axis < QwtPlot::axisCnt; axis++ )
71 d_rescaler->setIntervalHint( axis, QwtInterval( 0.0, 1000.0 ) );
72
73 connect( plot, SIGNAL( resized( double, double ) ),
74 SLOT( showRatio( double, double ) ) );
75 return plot;
76 }
77
setRescaleMode(int mode)78 void MainWindow::setRescaleMode( int mode )
79 {
80 bool doEnable = true;
81 QString info;
82 QRectF rectOfInterest;
83 QwtPlotRescaler::ExpandingDirection direction = QwtPlotRescaler::ExpandUp;
84
85 switch( mode )
86 {
87 case KeepScales:
88 {
89 doEnable = false;
90 info = "All scales remain unchanged, when the plot is resized";
91 break;
92 }
93 case Fixed:
94 {
95 d_rescaler->setRescalePolicy( QwtPlotRescaler::Fixed );
96 info = "The scale of the bottom axis remains unchanged, "
97 "when the plot is resized. All other scales are changed, "
98 "so that a pixel on screen means the same distance for"
99 "all scales.";
100 break;
101 }
102 case Expanding:
103 {
104 d_rescaler->setRescalePolicy( QwtPlotRescaler::Expanding );
105 info = "The scales of all axis are shrinked/expanded, when "
106 "resizing the plot, keeping the distance that is represented "
107 "by one pixel.";
108 d_rescaleInfo->setText( "Expanding" );
109 break;
110 }
111 case Fitting:
112 {
113 d_rescaler->setRescalePolicy( QwtPlotRescaler::Fitting );
114 const QwtInterval xIntv =
115 d_rescaler->intervalHint( QwtPlot::xBottom );
116 const QwtInterval yIntv =
117 d_rescaler->intervalHint( QwtPlot::yLeft );
118
119 rectOfInterest = QRectF( xIntv.minValue(), yIntv.minValue(),
120 xIntv.width(), yIntv.width() );
121 direction = QwtPlotRescaler::ExpandBoth;
122
123 info = "Fitting";
124 break;
125 }
126 }
127
128 d_plot->setRectOfInterest( rectOfInterest );
129
130 d_rescaleInfo->setText( info );
131 d_rescaler->setEnabled( doEnable );
132 for ( int axis = 0; axis < QwtPlot::axisCnt; axis++ )
133 d_rescaler->setExpandingDirection( direction );
134
135 if ( doEnable )
136 d_rescaler->rescale();
137 else
138 d_plot->replot();
139 }
140
showRatio(double xRatio,double yRatio)141 void MainWindow::showRatio( double xRatio, double yRatio )
142 {
143 const QString msg = QString( "%1, %2" ).arg( xRatio ).arg( yRatio );
144 statusBar()->showMessage( msg );
145 }
146
147