Re: QwtScaleWidget has wrong scale

Hi Klaus,
> Hi,
> 
> thanks for your suggestion. I tried it but it didn't work. Still I haven't 
> quite understood your solution, though: How can the VBox change the internal 
> behaviour of the colour scale, which is one widget with one bounding 
> rectange? Can you see an error in my implementation below, or does it simply 
> not work with a colour scale?

If you have the scale and the colour bar in the same layout, then, the 
scale line will fill the height of the layout minus the space needed for 
the numbers above and below the line.
The colour bar, however, will take the whole height and, thus, is longer 
than the line of the scale. So, you'll have to shrink the colour bar.
How can you do that? By putting it in an own layout and set the layout 
margins to the same value as the margins of the scale which are reserved 
  for the numbers.
You, then, shrink the colour bar while keeping the length of the scale 
constant.

>    // Qwt scale widget and stuff
>    QwtScaleWidgetX* scale = new QwtScaleWidgetX(QwtScaleDraw::RightScale, 
> this);
>    QwtLinearScaleEngine se;
>    scale->setScaleDiv(se.transformation(),
>                       se.divideScale(interval.minValue(), interval.maxValue(), 
> 8, 5)); // as in QwtPlot::Axis
>    scale->setColorBarEnabled(true);
>    scale->setColorMap(interval, colormap);
>    scale->setTitle("Intensity");
>    scale->setMargin(2);
>    // layout to adjust scale
>    QVBoxLayout* qd = new QVBoxLayout();
>    int margin = scale->scaleMargin();
>    scale->setMinimumSize(QSize(48, 170-2*margin));

Ah, I think there was a misunderstanding. I thought you had a colour bar 
  _and_ a free standing scale as two different objects.
Then, the solution, would work, because you could put bar and scale in 
different layouts.
If this is not the case, it is caused by internal behaviour of the 
bar/scale. Sorry, but for that, I don't know a solution.

Regards,

Rainer

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