Re: [udig-devel] Tiled Rendering and Mapgraphics Again

[Jody Garnett <jody.garnett@xxxxxxxxx>]

Okay my first useful feedback - as part of the code sprint I am
looking into printing in landscape mode.

And one of your changes is producing a NPE.

// this line is causing trouble when the renderer is used for printing
//
BlackboardItem cached =
(BlackboardItem)getContext().getLayer().getBlackboard().get(BLACKBOARD_IMAGE_KEY);

I am going to see what I can be done.
Jody


On Thu, Mar 5, 2009 at 11:01 AM, Emily Gouge <egouge@xxxxxxxxxxxxxxx> wrote:
> Hey Jody,
>
> What I have done is update the Mapgraphic Renderer to render the entire
> viewport onto a single image.  This image is then stored on the layer
> blackboard and used when rendering tiles.  When the tile comes along to
> render the mapgraphic the image is taken off the blackboard and the part
> that matches the tiles bounds are clipped and drawn.
>
> In order to make this work; when the mapgraphic context is created a
> viewport listener is added to the map so when the viewport bounds change the
> image cached on the layer's blackboard is cleared.
>
> The issues with the styling is not that layer.refresh() is not being called
> but rather that this doesn't cause my "cached" mapgraphic image on the
> blackboard to be cleared.
>
> A simple solution would be do not cache this image; but I can't imagine that
> would be very good performance wise as it would be rendering the image
> multiple times.
>
> I could add another listener that listeners for style events and clears the
> cache.
>
> Or maybe I could store information about the styles with my cached image and
> if they have changed then refresh the cached mapgraphic.
>
> Emily
>
>
> Jody Garnett wrote:
>>
>> Hi Emily.
>> On Thu, Mar 5, 2009 at 9:48 AM, Emily Gouge <egouge@xxxxxxxxxxxxxxx>
>> wrote:
>>
>>> The ongoing issue of tiled rendering and mapgraphics is causing me issues
>>> again so I'm working on a solution.  (The mapgraphics currently don't
>>> render
>>> properly if using tiled rendering).
>>
>>
>> Good to hear you making progress on this; when you have a moment I am
>> interested to hear what approach your solution is taking.
>>
>>> I currently have a solution that works most of the time.  The only thing
>>> it
>>> doesn't do properly right now is refresh when the style is changed.
>>
>>
>> Interesting. So the style changing would change the layer blackboard which
>> would fire an event (or EMF Notification?). From their we need to check to
>> see who is listening and make sure they issue a layer.refresh( null )
>> event?
>>
>>> I'm wondering if somebody can review my proposed changes and provide me
>>> with some feedback and ideas for dealing with the style change issue I'm
>>> having.  If somebody is willing to review the code I'll pass it along to
>>> them.
>>
>>
>> I have a bit of a backlog on uDig items right now; so I cannot in good
>> faith
>> volunteer at this time (I still owe Anrdrea a style save api).
>>
>> Jody
>>
>>
>>
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>>
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