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Re: [udig-devel] Problems with uDIG Table View and Rendering
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Hi. Right now in order to keep the different plugins decoupled the
features are loaded once by the table view for viewing and again by
the Renderer for rendering. I haven't come up with a good solution
yet beyond adding paging to the table so that the table view does not
load all the features. Once the table view is populated it has the
features in memory and should be fast. However it does take a while
to load especially if the renderer is going at the same time. There
could be a way to hook the renderer and the tableview together but I
am hesitant because the renderer does not request all attributes and
because the table view does not request the geometries(which the
renderer naturally needs). We have planned on adding paging to the
table so I could get on that potentially.
The table that is used is the SWT table with the Virtual style set so
it should be able to be as fast as a JTable.
At least with open JUMP (I don't know about gvSIG) the features are
kept in memory. So openJump is very fast but it is also not very
scalable.
If you (or anyone else) has suggestions I'd love to hear. For
example is the paging model one you are interested in?
Cheers,
Jesse
On 25-Jan-07, at 8:21 AM, Carsten Ehbrecht wrote:
Hello,
i'm testing uDIG to use it as a base GIS application for my
company. I would like to load 50000-500000 point features from a
postgis database. The uDIG table view can't handle so many features
and the map rendering is slow. When working with OpenJUMP and gvSIG
i don't have these problems. Especially the table is working with
no problems (using JTable, Swing).
- Why do these problems occur in uDIG? (using swt table? using swt
rendering?)
- How can these problems be fixed?
- What would you guess how much effort would it be to fix it?
Best Regards
Carsten
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User-friendly Desktop Internet GIS (uDig)
http://udig.refractions.net
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