[Drawkit] Scaling issues

[Graham Cox]

Good idea, I'll look into it.

It's trivial to suppress the knob drawing at some zoom factor, and  
I've determined that at their current chosen size, they become pretty  
much un-clickable with any reliability at zoom factors smaller than  
about 0.15. That's not quite the same thing as also taking into  
account the object's size, but currently knob size or visibility is  
completely unaware of that. It might be a bit strange to see parts of  
your drawing suddenly losing their knobs and not other parts depending  
on a combination of object size and zoom factor - but it's definitely  
worth investigating.

cheers, Graham



On 24 May 2008, at 5:08 pm, Uli Kusterer wrote:

> Am 24.05.2008 um 07:19 schrieb Graham Cox:
>> small objects are going to disappear altogether, let alone be still  
>> editable. These are the sorts of "usability issues" I was alluding  
>> to when trying to explain why there is a minimum scale limit.
>
>
> You could also have a minimum size for showing knobs. So, if an  
> object is being displayed smaller than, say, 8x8px at the current  
> scale factor, you just don't show any knobs on it, and if it gets  
> smaller than 2x2, you ignore it in hit testing, or so. That would be  
> useful for drawings that have both insanely huge and small objects.
>
> Not sure complete exclusion from hit-testing is desirable, maybe  
> that should even be smaller than one pixel before it gets ignored,  
> otherwise users with exceptional mouse control might get really  
> annoyed.
>
> Cheers,
> -- Uli Kusterer
> "The Witnesses of TeachText are everywhere..."
> http://www.zathras.de
>
>
>
>
>
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