[OpenLayers-Users] Any examples using Proj4js and OpenLayers.Projection class?

[Steve Lime]

Mike: I wanted to let you know that the forward transformation does indeed
work, thanks. I wasn't able to go the other way. 

Proj4js.defs['EPSG:3031'] = '+proj=stere +lat_0=-90 +lat_ts=-71 +lon_0=0 +k=1 +x_0=0 +y_0=0 +ellps=WGS84 +datum=WGS84 +units=m +no_defs'; // Antarctica Polar Stereographic
var wgs84 = new OpenLayers.Projection('WGS84');

var point = new OpenLayers.Geometry.Point(lon, lat);
OpenLayers.Projection.transform(point, wgs84, map.getProjectionObject()); // forward
alert(point.x +" "+ point.y); // correct
OpenLayers.Projection.transform(point, map.getProjectionObject(), wgs84); // reverse
alert(point.x +" "+ point.y); // no change, expect the original lat/lon

It's not a big deal for me since I really only need the forward transformation... 
Thanks for the hard work!

Steve


>>> On 12/24/2007 at 10:04 AM, in message <476FD890.3040902 at dmsolutions.ca>, Mike
Adair <madair at dmsolutions.ca> wrote:
> Steve,
> 
> I've updated Proj4js with the proj4 version of the stereographic 
> projection and my test point now comes out at the correct location.
> 
> You can get the update at 
> https://svn.codehaus.org/mapbuilder/cscs/trunk/proj4js/lib and use the 
> file proj4js-compressed.js (or proj4js-combined.js if you want to debug 
> what's going on inside).  Compressed and combined versions of proj4js 
> include all files required.
> 
> Let me know if that works for you.
> 
> Mike
> 
> 
> 
> Steve Lime wrote:
>> I'm working with openlayers trunk trying to get some point projection to 
> work. Code like this:
>>
>> <!-- pt src="scripts/openlayers/lib/OpenLayers.js"></scr -->
>> <!-- pt src="scripts/proj4js/lib/proj4js.js"></scr -->
>> <!-- pt src="scripts/proj4js/lib/projCode/stere.js"></scr -->
>>
>> map = new OpenLayers.Map( $('map'), {maxExtent: new 
> OpenLayers.Bounds(-2668252.000000,-2707008.500000,2813685.000000,2774928.5000
> 00),
>>                                                  maxResolution: 10706.9082, 
> units: 'm', projection: 'EPSG:3031'} );
>>
>> Proj4js.defs['EPSG:3031'] = '+proj=stere +lat_0=-90 +lat_ts=-71 +lon_0=0 +k=1 
> +x_0=0 +y_0=0 +ellps=WGS84 +datum=WGS84 +units=m +no_defs'; // Antarctica 
> Polar Stereographic
>> var wgs84 = new	OpenLayers.Projection('WGS84');
>>
>> var point = new OpenLayers.Geometry.Point(lon, lat);
>> OpenLayers.Projection.transform(point, wgs84, map.getProjection());
>> alert(point.x +" "+ point.y);
>>
>> doesn't seem to work, the x, y members remain unchanged. Any ideas? 
>>
>> Thanks!
>>
>> Steve
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>>
>>