Re: [udig-devel] SWTGraphics and Performance

[Emily Gouge <egouge@xxxxxxxxxxxxxxx>]

Thanks Jesse that is good to know.

I've been working on a pan tool that uses the scroll ability provided 
with a canvas instead of the transforms currently being used.  This 
makes scrolling much smoother which is rather nice.

However, my problem is that using advanced graphics makes things slow 
and unsmooth again.  I've narrowed down the slow down to the call to 
gc.setAdvanced(true) in the SWTGraphics class.  The rest of the class 
can still be used (and you still get transparency with the zoom and edit 
tools).

I'm thinking for now that if I'm panning I was not going to use advanced 
graphics.  This should only affect our new ViewportPaneTiledSWT class. 
Does this sound reasonable or do you have some better ideas?

Emily



Jesse Eichar wrote:
> Advanced graphics is needed for transparency with the tools I believe 
> also the edit tools probably won't work as well with out it (or maybe 
> not at all).
>
> Jesse
>
> On 11-Oct-08, at 12:41 AM, Emily Gouge wrote:
>
> > Okay so I've half figured out my answer.  This is a preference that we 
> > can turn on and off so there is no point in changing any code.
> >
> > So my question should probably be - what does it do and why is it 
> > turned on by default?  I seem to get the same functionality with 
> > better performance if I turn this off.
> >
> > Emily
> >
> > Emily Gouge wrote:
> > > I'm trying to make a fast smooth pan tool to go with the tiled 
> > > rendering system (and automatically add tiles as you pan).  I have 
> > > had some success, however I only get the improved performance if in 
> > > the SWTGraphics java class I comment out the line that says 
> > > gc.setAdvanced(true).
> > > What does setAdvanced do.  Is it necessary?
> > > Thanks,
> > > Emily
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