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Re: [udig-devel] Tiled Rendering and MapGraphics
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IMHO I think that MapGraphics should not be part of the tiling. The
reasoning is that they are supposed to be light-weight and fast. They
should normally be fast enough without tiling. And often are
independent of zoom so how would you know when to cache and when not to.
Jesse
On 4-Nov-08, at 11:49 PM, Emily Gouge wrote:
All,
I'm trying to clean up the the tiled rendering system I worked. One
of the things I'm currently looking at is trying to get mapgraphics
to work nicely with it.
My understanding is that currently mapgraphics pay attention to the
bounds of the screen. So in my tiled rendering system they are
paying attention to the bounds of the screen and using that
information to draw onto the tiles. These tiles don't match up with
the screen so as a result you get some fun results:
* legends, north arrows, etc on every tile.
* grids only partially filled in (if then render tiles are bigger
than the screen only what would fit on the screen is filled in on
the render tile).
So how to fix this?
One option is to not use the tiled rendering system for mapgraphics.
As a result mapgraphics would always render on top of the tiles and
you couldn't have map graphics in between layers or at the bottom of
the stack. My feeling is that this is undesirable behaviour.
Another option may be to have the mapgraphics pay attention to the
render bounds as well as the screen bounds and size; but I think
this will cause a lot of unnecessary complexity in the mapgraphics.
Does anybody have an other ideas on how to fix this problem?
Thanks,
Emily
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User-friendly Desktop Internet GIS (uDig)
http://udig.refractions.net
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