[OpenLayers-Users] GML, Point and Change the Size of the Circle...

[Andreas Hocevar]

Kit Plummer wrote:
> Ok, first let me plead practical ignorance here.  I've only been  
> working with OpenLayers for about a week.  And, I'm integrating it  
> into ExtJS.  I have a known GML file that contains Points.  I'd like  
> to be able to add an attribute to each element that would specify the  
> size of the circle that gets drawn by OL.  Am I out of luck here?  If  
> not, would somebody be so nice as to point me in the right direction?

Have a look at http://www.openlayers.org/dev/examples/styles-rotation.html.

You will want to use a style map, and define the pointRadius property of 
the symbolizer. Say you have a field called "size" in your GML features. 
Then your stylemap constructor call could look like that:

new OpenLayers.StyleMap({
    "default": OpenLayers.Util.applyDefaults({
        pointRadius: "${size}"
    }, OpenLayers.Feature.Vector.style["default"]
});

Regards,
Andreas.