[Qt-interest] QGraphicsSvgItem scalling image question

[Pritam Ghanghas]

On Tue, 2011-08-23 at 15:32 +0530, franki wrote:
> Dnia poniedziałek, 22 sierpnia 2011 o 14:56:06 franki napisał(a):
> > Hi,
> > 
> > I have some items on QGraphicsView that represents icons. Icons are
> > clickable and can change look (e.g. switch on/off) I need these icons to
> > come in different resolutions without lose of quality, so I tunerd to
> > QGraphicsSvgItem, supposedly this is Scalable Vector Graphics. But I can
> > find no way to change icon resolution. I've googled and all I've got is
> > that I could change some parameters in svg file before loading, simply by
> > parsing it. But with complex icon's that nearly impossible, or at least
> > highly cumbersome.
> > 	I do have however setScale() function that somes from QGraphicsItem, but
> > this is just applying transormation matrix onto item, and the item does not
> > have to be svg item,
> > 	So my question is: Do I get this right? Only possible scalling is by
> > setScale function or parsing svg text file? Because if so, what advantages
> > gives me using svg format? Does this downscale better that png format
> > giving better item quality?
> 
> Please anyone..
> I know it may be stupid question, but is it possible that function scale, or 
> setScale inherited from QGraphicsItem by QGraphicsSvgItem, takes advantage of 
> SVG file and render it without loss of quality in different size? 
> SVG Cards example is doing this that way, setting scale for every item form 
> one svg file.

setScale() should result in properly scaled svg Item (lossless). It
should be very easy to check. 
create the item, 
set the scale to be very huge may be 20x and then look for artifacts.
If scale is being applied after rasterization, you will get very visible
ugly looking pixel blocks.

-- 
Thanks,
Pritam

> 
> best regards
> Marek
> 
> > 
> > 
> > best regards
> > Marek
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