MultiBarChart Sample Legend

[Uwe]

You have to derive from QwtScaleDraw and overload the label method:

class YourScaleDraw: public QwtScaleDraw
{
public:
    virtual QwtText label( double value ) const
    {
        const int index = qRound( value );
        return ...
    }
};

class YourScaleDraw: public QwtScaleDraw
{
public:
    virtual QwtText label( double value ) const
    {
        const int index = qRound( value );
        return ...
    }
};

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and

plot->setAxisScaleDraw( QwtPlot::yLeft, new YourScaleDraw() );

plot->setAxisScaleDraw( QwtPlot::yLeft, new YourScaleDraw() );

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Have a look at the distrowatch example, that returns a label from a string list ( name of a distro ).

Of course this is not the most comfortable API for a bar chart - simply because it is using an API that is made for any type of coordinate system.
One idea I have is to add an optional module on top of the current APIs, that offers plots with a less powerful and flexible API, but with a very easy one, that is tailored for specific plot types.

Uwe