uDig is a desktop application; I was showing it to you as an example of how to call the graph code.
-- Jody Garnett On Tuesday, 1 March 2011 at 8:40 PM, mounir younes wrote: > is uDig a different library than geotools ? will I have to start over using > Udig ? or can I use uDig just for the sake of getting the shortest path? > > On Tue, Mar 1, 2011 at 12:27 AM, Jody Garnett <jody.garn...@gmail.com> wrote: > > Do you want to review the udig example? We let the user click on the map; > > find the closest feature; and sort it out from there. > > - > > https://github.com/uDig/udig-platform/tree/master/plugins/net.refractions.udig.graph/src/net/refractions/udig/graph/internal > > > > WayPoint Tool lets users define new waypoints. > > LineGraphOp lets people select a feature collection and generate a graph in > > memory > > FindPathOp finds the shortest path through all the waypoints. > > > > -- > > Jody Garnett > > > > On Tuesday, 1 March 2011 at 1:06 AM, mounir younes wrote: > > > In the docs there is a part that says > > > Finding the Shortest Path between two Nodes > > > it starts with: > > > > > > //reference to a graph, already built > > > Graph graph = ...see above... > > > > > > //find a source node (usually your user chooses one) > > > Node source = .. > > > > > > and then ... > > > > > > List/*<Node>*/ destinations = ... > > > > > > > > > My question is how can I initialize source and the list of nodes ? what > > > can I fill in (as code)? I already have the graph built could someone > > > help me write the code for it ? > > > > > > On Mon, Feb 28, 2011 at 12:57 AM, Jody Garnett <jody.garn...@gmail.com> > > > wrote: > > > > - Nodes; I think those are created by the builder when you set up your > > > > graph. They are mostly the internal structure of the graph and not that > > > > exciting. > > > > - You do not want to cast to a feature; you want to say > > > > graphable.getObject(). The builder put the feature their when building. > > > > Both Nodes and edges are "graphable". > > > > > > > > There is some docs here: > > > > - http://docs.codehaus.org/display/GEOTDOC/Graphs > > > > > > > > Have a look at the test cases: > > > > - > > > > http://svn.osgeo.org/geotools/trunk/modules/extension/graph/src/test/java/org/geotools/graph/ > > > > -- > > > > Jody Garnett > > > > > > > > On Monday, 28 February 2011 at 1:02 AM, mounir younes wrote: > > > > > How do I create the Node object? Node source =... ? I tried casted a > > > > > feature but did not work so i am currently stuck. > > > > > > > > > > > > > > > > > > > > .On Sun, Feb 27, 2011 at 4:18 PM, Jody Garnett > > > > > <jody.garn...@gmail.com> wrote: > > > > > Sounds like you are doing everything right, and then having trouble > > > > > drawing the result at the end of the day. > > > > > > > > > > > > The path provides the route between the two locations (think of it > > > > > > as an iterator). Each edge of the path is associated with a > > > > > > feature, use the path to "Walk" along the edges that make up the > > > > > > shortest route. You can retrieve the features along each edge if > > > > > > you want to draw the route visually. > > > > > > > > > > > > In terms of calculation you may wish to provide an edge weight > > > > > > based on the length of the associated feature (or perhaps even the > > > > > > length and speed limit). > > > > > > > > > > > > As for drawing ... > > > > > > 1. Write down the feature ids (perhaps in a Set<String>) as your > > > > > > walk along the path > > > > > > 2a. And then use these feature Ids to update a style (you can make > > > > > > a filter using the set of feature ids for the style, and ask the > > > > > > map to draw only the features on the path in a specific colour) > > > > > > 2b. Or if that is too much; walk along the path, and copy the > > > > > > features into a new feature collection, and add the new feature > > > > > > collection to your map. > > > > > > > > > > > > -- > > > > > > Jody Garnett > > > > > > > > > > > > On Sunday, 27 February 2011 at 5:11 AM, mounir younes wrote: > > > > > > > Hello, > > > > > > > > > > > > > > I will give a small example of what I am willing to do. First > > > > > > > let's say I have my house and my friend's house on Layer 1. > > > > > > > On layer 2 I have the roads between us. I want to discover the > > > > > > > shortest path between my house and my friend's and then colors > > > > > > > the roads only without the house. What should I do? I took a look > > > > > > > on the graphs on codehaus but couldn't figure out how I should > > > > > > > start. > > > > > > > > > > > > > > I got the steps but cannot figure out the code: > > > > > > > > > > > > > > 1- Create a feature collection (I know how to do this) > > > > > > > 2- add to it the house features (from layer1) and the roads (from > > > > > > > layer2) (I know how to do this as well) > > > > > > > 3- use the dijkstra included in the graphs extension > > > > > > > (http://communitymapbuilder.org/display/GEOTDOC/Graphs#Graphs-GraphingTerms) > > > > > > > > > > > > > > this will generate a path ! Is a path a straight line ? or is it > > > > > > > the roads between our houses? > > > > > > > > > > > > > > My house will be set as the source and my friend's as the > > > > > > > destination > > > > > > > > > > > > > > 4-Color ONLY the roads between them. > > > > > > > > > > > > > > could someone help me with this please (step 3 and 4) ? Include > > > > > > > code if possible > > > > > > > > > > > > > > Thank you in advance. > > > > > > > ------------------------------------------------------------------------------ > > > > > > > Free Software Download: Index, Search & Analyze Logs and other IT > > > > > > > data in > > > > > > > Real-Time with Splunk. Collect, index and harness all the fast > > > > > > > moving IT data > > > > > > > generated by your applications, servers and devices whether > > > > > > > physical, virtual > > > > > > > or in the cloud. Deliver compliance at lower cost and gain new > > > > > > > business > > > > > > > insights. http://p.sf.net/sfu/splunk-dev2dev > > > > > > > _______________________________________________ > > > > > > > Geotools-gt2-users mailing list > > > > > > > Geotools-gt2-users@lists.sourceforge.net > > > > > > > https://lists.sourceforge.net/lists/listinfo/geotools-gt2-users > > > > > > > > > > > > > > > > > > > > > > > > > > > >
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