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#include <stdlib.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(QwtPlotCanvas *canvas):
ScrollZoomer(canvas)
{
}
virtual void rescale()
{
QwtScaleWidget *scaleWidget = plot()->axisWidget(yAxis());
QwtScaleDraw *sd = scaleWidget->scaleDraw();
int minExtent = 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->majTickLength() + 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);
setCanvasLineWidth(2);
plotLayout()->setAlignCanvasToScales(true);
QwtPlotGrid *grid = new QwtPlotGrid;
grid->setMajPen(QPen(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
Zoomer *zoomer = new Zoomer(canvas());
zoomer->setRubberBandPen(QPen(Qt::red, 2, Qt::DotLine));
zoomer->setTrackerPen(QPen(Qt::red));
}
QSize RandomPlot::sizeHint() const
{
return QSize(540,400);
}
void RandomPlot::appendPoint()
{
double x = rand() % c_rangeMax;
x += ( rand() % 100 ) / 100;
double y = rand() % c_rangeMax;
y += ( rand() % 100 ) / 100;
appendData(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;
emit running(true);
canvas()->setPaintAttribute(QwtPlotCanvas::PaintCached, false);
d_timer->start(timeout);
}
void RandomPlot::stop()
{
if ( d_timer )
{
d_timer->stop();
emit running(false);
}
canvas()->setPaintAttribute(QwtPlotCanvas::PaintCached, true);
}
void RandomPlot::clear()
{
removeData();
replot();
}
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