[Qt-interest] Difference in drawing to a QPixmap VS QPrinter

[Andre Somers]

On 5-7-2010 9:38, Christopher Rasch-Olsen Raa wrote:
> Fredag 2. juli 2010 14.14.49 skrev Samuel Gaist :
>    
>> On 2 juil. 10, at 14:01, Christopher Rasch-Olsen Raa wrote:
>>      
>>> Hi,
>>>
>>> A requirement for an application I'm working on is that it should
>>> write a
>>> certain page of text to a .pdf. For that I'm using QPainter with
>>> QPrinter and
>>> setting the outputformat to Pdf. All is good so far.
>>>
>>> However, another requirement is that the application should be able
>>> to display
>>> a "preview" of the document. I though that the quickest way to
>>> achieve that
>>> must be to pass a QPixmap to the QPainter (since QPixmap is a
>>> paintdevice) and
>>> let the same code for painting do it's thing regardless for the
>>> 'medium'.
>>>
>>> What happens is that I get wildly varying looks on the two
>>> documents. The pdf
>>> looks fine(-ish. lacking some tweaks) but the image (QPixmap) does
>>> not. In the
>>> QPixmap the text is way too large.
>>>
>>> I use (pixmap/printer)->width() and ->height() to get the width and
>>> height of
>>> my 'canvas' and position things relative to the edges. When creating
>>> the fonts
>>> I pass the 'device' (a pixmap or printer) to the font's constructor.
>>> Is the
>>> something special I need to do to have the font 'scale' in
>>> accordance to the
>>> size of the available 'canvas'?
>>>
>>> Have anyone done this before and have some insight to share?
>>>        
>> Hi,
>>
>> I can not help you directly for the QPixmap problem but for what you
>> want to achieve you might be interested by QPrintPreviewWidget or
>> QPrintPreviewDialog.
>>
>> Hope this helps
>> Samuel
>>      
> Thanks for the input, but part of the challenge here is that I need to create
> tumbnails of several different documents at once and display them to the user
> side-by-side in the gui, not in different dialoges.
>    
And the QPrintPreviewWidget is not usable for that? If not, what is it 
that you need that this class does not provide exactly?

André


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