Re: Version 0.8.2.2: Ruler updates 'smearing'

["Dr. Roland Bock" <box2OO6 eudoxos de>]

Hi John,

since version 0.8.0.0, GtkDatabox comes with its own rulers.

The old gtk+ rulers have several problems, when ranges are very big or 
very small. The gtk+ developers are aware of this and will eventually 
remove the current rulers from gtk+. The GtkDatabox rulers aim at 
dealing better with extreme ranges while being at least as good with 
"normal" ranges.

In addition, the GtkDatabox rulers support logarithmic scaling.

Your's is the first negative feedback regarding the new rulers, if I am 
not mistaken.

The only "new" thing for you to that I can think of is: If you took care 
of placing the rulers yourself in your old code (instead of using 
gtk_databox_create_box_with_scrollbars_and_rulers), you would need to 
modify your code to use the new rulers. Since your code obviously 
compiles, there is nothing "new" I can think of. Sorry.

Also, I have no experience with the ARM platform at all.

So what can be done?

First of all, can you please try to zoom in and out with the examples, 
which come with the library? This basically has the same effect for the 
rulers as auto-rescaling. Do you see the same effect there?

Second, can you reproduce the effect with a minimal program that you can 
share so that others can check whether the see the same effect?

Third: The rulers are using cairo and I am certainly not the most 
knowledgeable person when it comes to cairo. So I suspect that there is 
something not done in the right way with cairo.

Maybe some cairo expert can take a closer look?


Regards,

Roland




John Smith wrote:
> Platform: ARM 920T (Cirrus Logic EP9315)
> Kernel 2.6.21.5
> GTK+ Version 2.10.14
> X-Windows: Kdrive
> Build System: Angstrom/OpenEmbedded
> gcc Version: 4.1.2
>
> Application: Updating plot with 'real-time' data and auto-scaling 
> periodically.
>
> Was using rev 0.6.0.0 without a problem. Updated to 0.8.2.2 and now the 
> rulers become all smeared and illegible.
>
> Is there something 'new' that has to be done or set with the new version?
>
> Thanks in advance,
>
> snafu
>
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