Hi PIero,
just writing a quick note that you might not be getting an answer... the
version you're using
is too old, and the SWT module is un-maintained even in the current
version (the last commit
is two years old), has not received updates in a long time... I believe the
original developer moved on to use
Swing in gvSig.
Maybe you should have a look at what uDig does, which is afaik to draw on a
BufferedImage, and then
have a fast path to transfer it onto a SWT canvas, and roll your own.
Or even better, jump on and become the maintainer of the module? That would
be awesome! :-)
Cheers
Andrea
On Wed, Mar 16, 2016 at 8:38 AM, Piero Campalani <[email protected]>
wrote:
> Hi list,
>
> I am refreshing a SwtMapPane with relatively high frequencies, but the
> renderings queue up quickly and my application gets exhausted (I get
> renderings with centuries of delay).
>
> To overcome this bottleneck I tried to trigger the rendering ---
> SwtMapPane#handleEvent(Event) -- with a reduced-area #redraw call to the
> SWT control.
>
> While for some reason I still have to investigate, the effective result of
> a reduced-area #redraw is actually what you expect to see (only the area
> you asked for gets refreshed), the rendering seems to ignore the bounds of
> the SWT.Paint event and still takes up all the resources of a full canvas
> drawing.
>
> Indeed in SwtMapPane#handleEvent I see the event bounds are ignored: the
> full visible area is used (``curPaintArea = getVisibleRect();'').
>
> Effectively reducing the rendering from the full client area of the pane
> to the reduced area brings down the elapsed rendering time from 50-100 ms
> (Intel i7) down to <10 ms.
>
> In my mind, implementing this means using some reflection + essentially
> calling #paint on the pane renderer with the reduced area & reduced AOI.
>
> Anyone feels like giving an opinion or suggestion?
>
> I am using a pretty old GT version (2.8, not even in SourceForge now...
> not sure how they got it here): is/was this a known issue that was solved
> in a later release? Am i just misunderstanding the whole thing an misusing
> the API? :)
>
> *Thanks*
> -Piero
>
>
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