QwtPlotRescaler extra space

[Uwe]

Well QwtPlot::updateLayout() is about adjusting the content to a given geometry, not about changing the geometry. So the posted implementation will never work !

Better try something like this:

class YourPlotLayout: public QwtPlotLayout
{
public:
        virtual void activate( const QwtPlot *plot,
            const QRectF &rect, Options options  )
        {
            const QRectF rect = adjustedRect( plot, rect );
            QwtPlotLayout::activate( plot, adjustedRect, options );
        }
};

class YourPlotLayout: public QwtPlotLayout
{
public:
        virtual void activate( const QwtPlot *plot,
            const QRectF &rect, Options options  )
        {
            const QRectF rect = adjustedRect( plot, rect );
            QwtPlotLayout::activate( plot, adjustedRect, options );
        }
};

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and

plot->setPlotLayout( new YourPlotLayout() );

plot->setPlotLayout( new YourPlotLayout() );

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Then it boils down to finding an implementation for YourPlotLayout::adjustedRect(). Here you have to start with finding a square rectangle for the canvas, that has to be expanded, by the space needed for the axes, title, footer, legend.

Of course you could also try to find a complete new implementation for YourPlotLayout::activate(). In this case you would also start with the square canvas, but then you would also calculate all the other geometries yourself.

Uwe