Re: [OpenMap Users] Moving Blip

From: Don Dietrick <>
Date: Wed, 15 Dec 2004 10:57:39 -0500

Hi Mark,

On Dec 15, 2004, at 10:01 AM, Potter, Mark A (UK Rochester) wrote:

> Hello All,
> I have recently swapped from using another set of map utilities to
> using OpenMap, and so I am reasonably new to it. I have been really
> delighted with the capabilities so far, but I have one niggling
> problem that I am really struggling with, the frustration being how
> simple it should be to do - I'm sure I'm missing something. I've also
> being trawling around the OM mailing list archives, and found similar
> problems but as yet no definitive solution for what I am trying to
> achieve. Any help you can provide will be greatly appreciated.
> So far I have used openmap to produce a moving map - receiving
> lat/long information across a network and re-entering the map to suit.
> Brilliant, took me a day to do that. Took me a further day to learn
> how to zoom in and out to set ranges (i.e.. 100m, 200m, 400m and so
> on). Incidentally I've got a curious problem with that but I'll save
> that one for later...
> I have made myself a little application called that pulls in
> the necessary objects from open map and diy-builds the layers (I do
> not use the .properties file)... this is because at a later date I'll
> need to tell it which map data to pull in depending on a current
> location (map data will be in different formats - bring on
> standardisation!)...

That's perfectly fine. Using the file is just a way
to be able to change things without recompiling.

> I have a loop running (I know its not the best solution but this is a
> proof-of-concept research project), that does the following:
> while(true) {
> System.out.println("Current lat = " +
> currentPos.getLatitude());
> System.out.println("Current lng = " +
> currentPos.getLongitude());
> getTelemetry();
> centreMap();
> paintSymbol();

What happens in paintSymbol()? I mean, how are you drawing the circle
on the MapBean from a method call in

- Don

> }
> I have a global LatLonPoint currentPos, which getTelemetry() populates
> with the current position (recieved once a second).
> centreMap() does what it says on the tin, centre-ing the map on the
> current position.
> paintSymbol() I just want to put a circle in the middle of the screen
> (moreover, the current lat lon position), representing the object
> being tracked.
> I've tried so many ways of doing this it is unreal... An "OMGraphics
> guide for Dummies" answer would be delightful - it is such a simple
> thing to do I'm going insane! I've spent 2 weeks trying to get it
> right!!!
> Any more information required just shout. I'm using MapBean and a
> MapHandler to which I'm adding layers.
> Thanks,
> Mark Potter.
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Don Dietrick,
BBN Technologies, Cambridge, MA

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Received on Wed Dec 15 2004 - 10:58:51 EST

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