[OpenLayers-Users] Value of map.getExtent() is not precise?

[Pedro Simonetti Garcia]

Sorry,

My free host is really bad, and the image sometimes will not download.
I've uploaded those images to my googlepages:

http://pedrosimonetti.googlepages.com/viewport.JPG
http://pedrosimonetti.googlepages.com/print.jpg

regards,

Pedro Simonetti.

2008/4/29 Pedro Simonetti Garcia <pedrosimonetti at gmail.com>:
> Hi all,
>
>  I need a little help here. I'm developing a printing system, but I'm
>  getting some
>  problem with the extents.
>
>  I'm trying to print the map viewport, so I'm using the map.getExtent() and
>  map.getCurrentSize() values and passing it to the server, which calls the
>  mapserver and generates the image with the specified extent and size.
>
>  The problem is that the printed area is not exactly the same as showed at
>  the viewport. The output area is around 20% larger.
>
>  What I'm doing wrong? How can I precisely calculate the viewport extents?
>
>  The client code is something like this:
>
>     var currentSize     = map.getCurrentSize();
>     var viewportWidth   = currentSize.w;
>     var viewportHeight  = currentSize.h;
>     var extent          = map.getExtent();
>     var sPrintExtent    = extent.toBBOX();
>
>     var url = 'print.php?' +
>               'size=custom' +
>               '&width=' + viewportWidth +
>               '&height=' + viewportHeight +
>               '&extent=' + sPrintExtent;
>
>     window.open(url);
>
>
>  To better understand what I'm talking about, take a look at this
>  screenshot of my viewport:
>  http://jproton.com.br/sandbox/viewport.JPG
>
>  And in the output image:
>  http://jproton.com.br/sandbox/print.jpg
>
>
>  my best regards,
>
>  Pedro Simonetti.
>