1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
|
#include <qglobal.h>
#include <qtimer.h>
#include <qwt_plot_grid.h>
#include <qwt_plot_canvas.h>
#include <qwt_plot_layout.h>
#include <qwt_scale_widget.h>
#include <qwt_scale_draw.h>
#include "scrollzoomer.h"
#include "randomplot.h"
const unsigned int c_rangeMax = 1000;
class Zoomer: public ScrollZoomer
{
public:
Zoomer( QWidget *canvas ):
ScrollZoomer( canvas )
{
#if 0
setRubberBandPen( QPen( Qt::red, 2, Qt::DotLine ) );
#else
setRubberBandPen( QPen( Qt::red ) );
#endif
}
virtual QwtText trackerTextF( const QPointF &pos ) const
{
QColor bg( Qt::white );
QwtText text = QwtPlotZoomer::trackerTextF( pos );
text.setBackgroundBrush( QBrush( bg ) );
return text;
}
virtual void rescale()
{
QwtScaleWidget *scaleWidget = plot()->axisWidget( yAxis() );
QwtScaleDraw *sd = scaleWidget->scaleDraw();
double minExtent = 0.0;
if ( zoomRectIndex() > 0 )
{
// When scrolling in vertical direction
// the plot is jumping in horizontal direction
// because of the different widths of the labels
// So we better use a fixed extent.
minExtent = sd->spacing() + sd->maxTickLength() + 1;
minExtent += sd->labelSize(
scaleWidget->font(), c_rangeMax ).width();
}
sd->setMinimumExtent( minExtent );
ScrollZoomer::rescale();
}
};
RandomPlot::RandomPlot( QWidget *parent ):
IncrementalPlot( parent ),
d_timer( 0 ),
d_timerCount( 0 )
{
setFrameStyle( QFrame::NoFrame );
setLineWidth( 0 );
plotLayout()->setAlignCanvasToScales( true );
QwtPlotGrid *grid = new QwtPlotGrid;
grid->setMajorPen( Qt::gray, 0, Qt::DotLine );
grid->attach( this );
setCanvasBackground( QColor( 29, 100, 141 ) ); // nice blue
setAxisScale( xBottom, 0, c_rangeMax );
setAxisScale( yLeft, 0, c_rangeMax );
replot();
// enable zooming
( void ) new Zoomer( canvas() );
}
QSize RandomPlot::sizeHint() const
{
return QSize( 540, 400 );
}
void RandomPlot::appendPoint()
{
double x = qrand() % c_rangeMax;
x += ( qrand() % 100 ) / 100;
double y = qrand() % c_rangeMax;
y += ( qrand() % 100 ) / 100;
IncrementalPlot::appendPoint( QPointF( x, y ) );
if ( --d_timerCount <= 0 )
stop();
}
void RandomPlot::append( int timeout, int count )
{
if ( !d_timer )
{
d_timer = new QTimer( this );
connect( d_timer, SIGNAL( timeout() ), SLOT( appendPoint() ) );
}
d_timerCount = count;
Q_EMIT running( true );
d_timeStamp.start();
QwtPlotCanvas *plotCanvas = qobject_cast<QwtPlotCanvas *>( canvas() );
plotCanvas->setPaintAttribute( QwtPlotCanvas::BackingStore, false );
d_timer->start( timeout );
}
void RandomPlot::stop()
{
Q_EMIT elapsed( d_timeStamp.elapsed() );
if ( d_timer )
{
d_timer->stop();
Q_EMIT running( false );
}
QwtPlotCanvas *plotCanvas = qobject_cast<QwtPlotCanvas *>( canvas() );
plotCanvas->setPaintAttribute( QwtPlotCanvas::BackingStore, true );
}
void RandomPlot::clear()
{
clearPoints();
replot();
}
|
