[OpenLayers-Users] Converting distance to map units?

[Xingshan He]

I am trying to create a circle with fixed radius programatically and am using OpenLayers.Geometry.Polygon.createRegularPolygon(center, radius, sides, angle) to do that.  

I have trouble converting my distance, say 800 feet, to the correct radius value in map units.  This is what I do:

 

var inches = OpenLayers.INCHES_PER_UNIT;

radius = radius * inches["ft"] / inches[map.getUnits()];

 

The circle drawn has smaller radius than what I wanted.  What's the right way of converting real distance to map units?  And by 'map units', does it mean the value returned by map.getUnits()?

 

Thanks for any help.

 

Cynthia
 		 	   		  
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