Replot dinamic curve.

[Zikoel]

Hi,

I have extended the class QwtPlot like the example "Oscilloscope". I must write a similar code but more simple. I have a thread "out of my control" that emit a signal each 100 msec. I have write in my custom class this slot:

void Plot::addSampledPoint(double time, double sample)
{
	samples.append(QPointF(time, sample));
	d_curve->setSamples(samples);
 
	const QwtScaleMap xMap = canvasMap( d_curve->xAxis() );
	const QwtScaleMap yMap = canvasMap( d_curve->yAxis() );
	QwtSeriesData<QPointF> *data=d_curve->data();
 
	QRectF br = qwtBoundingRect( *data, 0, data->size()-1 );
	const QRect clipRect = QwtScaleMap::transform( xMap, yMap, br ).toRect();
	d_directPainter->setClipRegion( clipRect );
	d_directPainter->drawSeries(d_curve, 0, data->size()-1);
}

void Plot::addSampledPoint(double time, double sample)
{
	samples.append(QPointF(time, sample));
	d_curve->setSamples(samples);

	const QwtScaleMap xMap = canvasMap( d_curve->xAxis() );
	const QwtScaleMap yMap = canvasMap( d_curve->yAxis() );
	QwtSeriesData<QPointF> *data=d_curve->data();

	QRectF br = qwtBoundingRect( *data, 0, data->size()-1 );
	const QRect clipRect = QwtScaleMap::transform( xMap, yMap, br ).toRect();
	d_directPainter->setClipRegion( clipRect );
	d_directPainter->drawSeries(d_curve, 0, data->size()-1);
}

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When the samples are a QVector compatible with setSamples. I have no error but when I start the sampling I don't see anything.

P.s. If I initialize the samples when I write d_curve->attach(this) I van see the point.

Any suggest? Sorry for my simple English. (Obviously thank you at all).