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#include <qwt_plot.h>
#include <qwt_plot_canvas.h>
#include <qwt_plot_curve.h>
#include <qwt_symbol.h>
#include "incrementalplot.h"
#if QT_VERSION >= 0x040000
#include <qpaintengine.h>
#endif
CurveData::CurveData():
d_count(0)
{
}
void CurveData::append(double *x, double *y, int count)
{
int newSize = ( (d_count + count) / 1000 + 1 ) * 1000;
if ( newSize > size() )
{
d_x.resize(newSize);
d_y.resize(newSize);
}
for ( register int i = 0; i < count; i++ )
{
d_x[d_count + i] = x[i];
d_y[d_count + i] = y[i];
}
d_count += count;
}
int CurveData::count() const
{
return d_count;
}
int CurveData::size() const
{
return d_x.size();
}
const double *CurveData::x() const
{
return d_x.data();
}
const double *CurveData::y() const
{
return d_y.data();
}
IncrementalPlot::IncrementalPlot(QWidget *parent):
QwtPlot(parent),
d_data(NULL),
d_curve(NULL)
{
setAutoReplot(false);
}
IncrementalPlot::~IncrementalPlot()
{
delete d_data;
}
void IncrementalPlot::appendData(double x, double y)
{
appendData(&x, &y, 1);
}
void IncrementalPlot::appendData(double *x, double *y, int size)
{
if ( d_data == NULL )
d_data = new CurveData;
if ( d_curve == NULL )
{
d_curve = new QwtPlotCurve("Test Curve");
d_curve->setStyle(QwtPlotCurve::NoCurve);
d_curve->setPaintAttribute(QwtPlotCurve::PaintFiltered);
const QColor &c = Qt::white;
d_curve->setSymbol(QwtSymbol(QwtSymbol::XCross,
QBrush(c), QPen(c), QSize(5, 5)) );
d_curve->attach(this);
}
d_data->append(x, y, size);
d_curve->setRawData(d_data->x(), d_data->y(), d_data->count());
#ifdef __GNUC__
#warning better use QwtData
#endif
const bool cacheMode =
canvas()->testPaintAttribute(QwtPlotCanvas::PaintCached);
#if QT_VERSION >= 0x040000 && defined(Q_WS_X11)
// Even if not recommended by TrollTech, Qt::WA_PaintOutsidePaintEvent
// works on X11. This has an tremendous effect on the performance..
canvas()->setAttribute(Qt::WA_PaintOutsidePaintEvent, true);
#endif
canvas()->setPaintAttribute(QwtPlotCanvas::PaintCached, false);
d_curve->draw(d_curve->dataSize() - size, d_curve->dataSize() - 1);
canvas()->setPaintAttribute(QwtPlotCanvas::PaintCached, cacheMode);
#if QT_VERSION >= 0x040000 && defined(Q_WS_X11)
canvas()->setAttribute(Qt::WA_PaintOutsidePaintEvent, false);
#endif
}
void IncrementalPlot::removeData()
{
delete d_curve;
d_curve = NULL;
delete d_data;
d_data = NULL;
replot();
}
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