QwtPlot sample to pixel association

[catto]

Hi,

I'd appreciate some help with the following. If you set some raw data on a QwtPlotCurve, how can you make the plot draw consecutive samples in consecutive pixels?

For example, in a QwtPlot subclass constructor:

QwtPlotCurve *curve = new QwtPlotCurve("curve");
curve->setPen(QPen(Qt::green, 1));
curve->attach(this);
setCanvasBackground( QColor(Qt::black) );
curve->setData(qwtData);
enableAxis(QwtPlot::xBottom, false);
enableAxis(QwtPlot::yLeft, false);
setMargin(0);
setFixedSize(800, 600);

QwtPlotCurve *curve = new QwtPlotCurve("curve");
curve->setPen(QPen(Qt::green, 1));
curve->attach(this);
setCanvasBackground( QColor(Qt::black) );
curve->setData(qwtData);
enableAxis(QwtPlot::xBottom, false);
enableAxis(QwtPlot::yLeft, false);
setMargin(0);
setFixedSize(800, 600);

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If qwtData has 400 values, they don't occupy half of the plot, instead they are stretched to fit the whole 800 pixels.

I'd be very thankful for any clues.

catto