Hi Rose
I'm no guru, However.. This is how I keep track of new and existing objects on the map..
First of all, at initialisation time, I create an OmGraphicList with an object name that is unique to my application.. Say VesselList. I add this empty list to the main OpenMap OmGraphicList.
So now you have somewhere to place your vessal objects as you create them..Remember your
As each new vessel message is received by your message handler routine, Search the vessel list for the same name id as the new vessel and if you have a match, then you know that all you need to do is update the vessel object in the list.
I cannot attach any code at present , Sorry about that .. If I find time to dig some out I will send it on ( I'm being sent away!)
Hope this helps
regards
Mark.
-----Original Message-----
From: owner-openmap-users_at_bbn.com [mailto:owner-openmap-users_at_bbn.com]On
Behalf Of Rose Zhou
Sent: 11 August 2005 15:34
To: openmap-users_at_bbn.com
Subject: [OpenMap Users] Vessel Tracking System
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Hi, OpenMap Gurus:
I am new to OM, we want to use OM to develop a vessel tracking system. It
should be similar to the vehicle tracking system. When the message is
received, I can extract the unique vessel ID and position coordinates
(Longitude,Latitude). My question is how to decide whether it is a new
vessel or it is already displayed on the map and only needs to be updated?
Any info or code snippet is greatly appreciated!
Best Regards
Rose Zhou
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Received on Fri Aug 12 2005 - 04:18:00 EDT