Shortest Path

[Trevor Wekel]

Hi Alejandro,
 
Yes.  You could implement a shortest path command as a C# aspx web page.  This page could then be called from a web application similar to the existing buffer.aspx script.  MapGuide does not currently support topology so you would have to create the topology out of the raw geometry before running the shortest path algorithm.
 
Here is a general outline:
 
Select the features of interest using FeatureService::SelectFeatures()
Iterate through the features recording the end points and identity properties
Using some heuristics, iterate through the end points to determine which "touch" and create the network topology.  An intersects call with a small circle around each end point may be appropriate.
Using the network topology, determine the shortest path.
Using the identity properties for the shortest path features, highlight the shortest path using a technique similar to measure.aspx
 
 
This algorithm could also be coded in C++.  A C++ version would be faster but also more difficult to implement.
 
 
Thanks,
Trevor
 

  _____  

From: Alejandro Guzman [mailto:lguzmanc at gmail.com] 
Sent: Tuesday, October 03, 2006 9:56 AM
To: users at mapguide.osgeo.org
Subject: Shortest Path



Hello 

Nowadays I am evaluating some Internet Map Servers to use one of them in a project. Till now, due to diverse benefits that this one offers, I have decided on MapGuide Open Source, nevertheless even I do not still have totally cleared some questions. Specifically my questions are directed to:

 

Can I create a new command to find shortest path?

If it is true, can I programme it with C#? 

Or would I have to modify to the source code of Mapguide to do this, and therefore use a specific language of programming?

Do solutions exist type plug-in to find the shortest path with mapguide?

 

Thanks 

Alejandro Guzmán

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