[Qt-interest] Keep Same QGraphicsItem's Pen Width Across Scaling

[Josiah Bryan]

Jason H wrote:
> I think is you set pen width to 0, it will always give you one physical pixel of outline.

That's the thing though - I *don't* want a single physical pixel - I 
want approx the same width across scales, but the original width WILL 
vary depending on other factors. Sometimes the physical pixels I want 
will be 3, other times 1, other times 5...etc, etc.

> 
> 
> ----- Original Message ----
> From: cyril.mailing.list <cyril.mailing.list at gmail.com>
> To: Josiah Bryan <jbryan at productiveconcepts.com>
> Cc: Qt-interest <qt-interest at trolltech.com>
> Sent: Friday, October 2, 2009 9:47:30 AM
> Subject: Re: [Qt-interest] Keep Same QGraphicsItem's Pen Width Across Scaling
> 
> Josiah Bryan a écrit :
>> I've got a custom QGraphicsItem (simple box) that draws an outline 
>> around itself, say 3px wide. Great for "normal" live view. However, my 
>> app also renders an "icon" view of the scene that the box is in - this 
>> "icon" is about 96x96. Then there's also the "preview" view of the scene 
>> before it goes live, this is rendered about 320x240. The live scene is 
>> scaled approx 1:1, so its about 1024x768.
>>
>> What I'm wondering is if there's any way for my custom graphics item to 
>> find out the scale it's being rendered at so that it can adjust it's pen 
>> width accordingly inorder to render at approx 3px width regardless of 
>> scale? (The outline isn't always 3px - it can vary depending on various 
>> other factors [type of box, datapoint the box represents, etc]).
>>
>> Any ideas on how to find the scale of the scene from inside the paint 
>> method of my graphics item?
>>
>> Thanks!
>> -josiah
>>
>>
>>  
> My understanding of your problem is that you're looking for so-called 
> 'cosmetic' pens.
> see QPen::setCosmetic(bool)
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-- 

-=-=-=-=-=-=-=-=-=-=-=-=-
Josiah Bryan
Productive Concepts, Inc.
jbryan at pciint.com
(765) 964-6009, ext. 224