MultiBarChart Sample Legend

[Prof.]

I'd like to change the titles shown to the left of each sample to something different than 0, 1, 2... as shown in the image below.

fghgh.jpg

Thank you for any help.

[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 ...
    }
};

To copy to clipboard, switch view to plain text mode 

and

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

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

To copy to clipboard, switch view to plain text mode 

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

[Prof.]

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 ...
    }
};

To copy to clipboard, switch view to plain text mode 

and

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

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

To copy to clipboard, switch view to plain text mode 

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

That worked perfectly, thanks Uwe.

I'm still relatively new to Qt, considering what a massive system it is.
Half of the time I google something I want to know about Qt, one of your posts is what eventually answers my question.