Patch suggestion for QwtScaleWidget.

[clu]

Hi,

I have a minor patch suggestion for QwtScaleWidget. It's a simple function to update the colorbar interval. The reason I've done this is to avoid creating a new colormap every time I want to update the colorbar interval for an incremental spectrogram. This new function simplifies the code I need to write to have user-selectable colormaps for the spectrogram in real time.

I've tested this with my incremental plot code and it seems to work fine.

qwt_scale_wdiget.cpp:

/*!
  Set the color bar interval.
 
  \param interval Value interval
 
  \sa colorBarInterval(), setColorMap()
*/
void QwtScaleWidget::setColorBarInterval(const QwtInterval &interval)
{
    d_data->colorBar.interval = interval;
 
    if ( isColorBarEnabled() )
        layoutScale();
}

/*!
  Set the color bar interval.

  \param interval Value interval

  \sa colorBarInterval(), setColorMap()
*/
void QwtScaleWidget::setColorBarInterval(const QwtInterval &interval)
{
    d_data->colorBar.interval = interval;

    if ( isColorBarEnabled() )
        layoutScale();
}

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qwt_scale_widget.h:

void setColorBarInterval(const QwtInterval &);

void setColorBarInterval(const QwtInterval &);

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Hope this is helpful.