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

[cyril.mailing.list]

bis:
see QPen::setCosmetic(bool)


Josiah Bryan a écrit :
> 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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