It is a possible to disable QwtPlot autoscaling of contents?

[navrocky]

I want to disable contents autoscaling of QwtPlot, but i don't know how do this.

I wrote a simple hack for this:

class Plot : public QwtPlot
 
...
 
bool Plot::eventFilter(QObject* o, QEvent* e)
{
    if (o == canvas())
    {
        if (e->type() == QEvent::Resize)
        {
            QResizeEvent* re = static_cast<QResizeEvent*> (e);
            setAxisScale(QwtPlot::xBottom, 0, re->size().width());
            setAxisScale(QwtPlot::yLeft, 0, re->size().height());
            replot();
        }
    }
 
    return QwtPlot::eventFilter(o, e);
}

class Plot : public QwtPlot

...

bool Plot::eventFilter(QObject* o, QEvent* e)
{
    if (o == canvas())
    {
        if (e->type() == QEvent::Resize)
        {
            QResizeEvent* re = static_cast<QResizeEvent*> (e);
            setAxisScale(QwtPlot::xBottom, 0, re->size().width());
            setAxisScale(QwtPlot::yLeft, 0, re->size().height());
            replot();
        }
    }

    return QwtPlot::eventFilter(o, e);
}

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But it looks ugly (

This screenshots points to what i mean:
my_needs.jpg

What can i do?

[Uwe]

Your code assigns widget coordinates as plot coordinates ...

The easiest way to disable autoscaling ( what is not what you mean by autoscaling ! ) is to assign a scale. But you are looking for QwtPlotRescaler. Check the navigation example - the second combo box should do what you need.

Note that it is not always possible to have a fixed aspect ratio for the plot canvas. The problem here is a ping-pong effect between the adjustments of the scales ( according to the size of the canvas ) and the space that is needed for the resulting tick labels, that might modify the size that is left for the canvas.

Uwe