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Re: [udig-devel] basic route finding committed to trunk tutorials
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Jody,
I'd like to take a look at your route tutorial code for a project.
Where did you commit it in tutorials? I don't see anything named route
or routing?
Graham.
Jody Garnett wrote:
This is the graph module writen by justin; used by refractions for
years and years on JUMP; ported to GeoTools for use with the
"Validation Web Feature Server" project in 2003. And now finally
available in tool form for udig. This is one of those 1/2 day jobs
that is so quick to do that we always leave it until it is needed for
a project. JTS also has lots of functionality that you can leverage
quickly if needed ... we just need time and motivation to make a user
interface ...
Here docs for graph module:
- http://docs.codehaus.org/display/GEOTDOC/Graphs
The graph layer is just a visualization of a data structure; the data
structure is stored on the map black board (like we always do when
working with a domain model). We actually have a couple map graphics
to show different aspects of the map black board in this solution...
I do not care about the features; I care about the data structure that
has been produced from the features...
Jody
Vince Darley wrote:
That sounds good! Can you describe a bit more about the
technological approach behind this? I can guess what the "graph" is
that is put on the map blackboard, and I understand the Path map
graphic is just to display the results, but it's not clear what the
'Graph' layer is for - (for example, why couldn't the nodes be taken
directly from the original features without requiring this extra layer)?
Anyway, I'm intrigued, so if you have time, please do say a bit more.
Vince.
At 23:07 25/09/2008, Jody Garnett wrote:
fun fun...
workflow.
1. select features
2. right click and choose "Line Graph" (this will generate a graph
and copy it to the map black board)
(it will also add the "Path" and "Graph" layers to your map - if
they are not already there)
3. Choose the "waypoint" tool to select several stops on your path
(this will snap to the nearest "Node" in the graph and build a
List<Node> on the map blackboad - the "Path" map graphic will show
this to you)
4. Right click and choose "Generate route" this will generate a
List<Edge> which the map graphic will show to you
Screen snap attached.
Jody
_______________________________________________
User-friendly Desktop Internet GIS (uDig)
http://udig.refractions.net
http://lists.refractions.net/mailman/listinfo/udig-devel
_______________________________________________
User-friendly Desktop Internet GIS (uDig)
http://udig.refractions.net
http://lists.refractions.net/mailman/listinfo/udig-devel
--
Graham Davis
Refractions Research Inc.
gdavis@xxxxxxxxxxxxxxx
