Re: [udig-devel] Tiled Rendering and MapGraphics

[Emily Gouge <egouge@xxxxxxxxxxxxxxx>]

Sorry, but I'm still confused?

> 0. Behind the scenes make an image the size of the screen
Are you proposing I change the mapgraphic renderer?
Make it render an image for each mapgraphic the size of the screen 
whenever there is a viewport model change event?

Jody Garnett wrote:
> Emily Gouge wrote:
> > I'm somewhat confused by this and probably don't understand your idea.
> >
> > My understanding is that the renderers render an image using a 
> > context.  In the case of mapgraphics this context contains information 
> > about the size of the image and viewport model.
> Understood.
> > In my case the size of the image that is being drawn is determined by 
> > the tiled render manager (and is always the tile size).  So if the 
> > tiled render manager is to create a bigger image for mapgraphic layers 
> > it needs to know what layers are mapgraphics and which aren't.
> So try this ...
> 0. Behind the scenes make an image the size of the screen
> 1. Listen to the viewport model change; when it does ...
> 2. Render on to your image behind the scenes ...
> 3. When the tiled render comes along asking for an image (and providing 
> a context)
> 4. Use the provided context and draw a portion of your image onto that 
> tiles
> > Am I missing something here?
> Hopefully the above idea now makes sense; you may need to store your 
> behind the scene image on the layer blackboard (in case the mapgraphic 
> is used on several maps ...).
>
> Cheers,
> Jody
>
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