Re: Image Server, Shape Layers and Image bounds problem

Paul,

When the shape layer is missing, is it even being asked for any
graphics? You could set a -Ddebug.shape command line to see if it is
getting pinged. Actually, you could use -Ddebug.imageserver for better
messages about what the image server is doing with what layers.

I haven't seen this behavior. The ImageServer should be calling the
layer's ProjectionPainter method (renderDataForProjection()), so the
layer shouldn't be reacting differently to any one projection over
another - i.e. what you are expecting to happen should be happening.

- Don

On Tuesday, April 9, 2002, at 01:37 AM, Paul Chisholm wrote:

> Hi,
>  
> I have a server that uses OpenMap to generate JPEG files and it is
> exhibiting some strange behaviour. The images are created via the
> ImageServer class. Two different types of image are generated, one
> essentially a large scale version of the other. Both consist of a shape
> layer and a few other (non Shape) layers. What happens is:
>  
> - request first image, ok
> - request second image, shape layer missing
> - request first image, shape layer missing
> - request second image, shape layer missing
> - request second image, ok
> - request second image, ok
> - request first image, shape layer missing
> etc
>  
> The pattern is that each time I change between maps the shape layer is
> missing from the image. However, a subsequent request for the same map
> includes the shape layer.
>  
> I experimented with various parameters and eventually found that the
> cause of the missing shape layer is due to the change in dimensions of
> the image. That is, when there is a change to either <width> or
> <height> in the following (wrt the previous request) the shape layer is
> missing from the image (95% of the time).
>  
>         server.setLayers(<layers>);
>         Mercator proj = new Mercator(<centre>, <scale>, <width>,
> <height>);
>         byte[] bytes = server.getMapImage(proj);
>  
> Changing <centre>, <scale> or <layers> causes no problem.
>  
> I am using OpenMap 4.4.2 on Windows NT 4 (SP6). Anyone know of any
> reason why this behaviour occurs, or how I might be configuring
> something incorrectly to induce the behaviour.
>  
> Thanks,
> Paul Chisholm
>

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Don Dietrick, BBN Technologies, dietrick@bbn.com
10 Moulton Street, Cambridge, MA 02138
617-873-3031 [fax]-2794
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