[OpenLayers-Dev] Still a fix needed in OL. getGeodesicArea when crossing the dataline

[Phil Scadden]

I was updating to 2.13.1 and checking patches I had made to OL code 
versus the new version.
Unfortunately, I have never mastered GIT, but correct code (and yes it 
is ugly) is this:
(for linearRing.js)

     getGeodesicArea: function(projection) {
         var ring = this;  // so we can work with a clone if needed
         if(projection) {
             var gg = new OpenLayers.Projection("EPSG:4326");
             if(!gg.equals(projection)) {
                 ring = this.clone().transform(projection, gg);
             }
         }
         var area = 0.0;
         var len = ring.components && ring.components.length;
         if(len > 2) {
             var p1, p2;
             for(var i=0; i<len-1; i++) {
                 p1 = ring.components[i];
                 p2 = ring.components[i+1];
                 var d = p2.x - p1.x;
                 if (Math.abs(d) > 180) {
                   if (d>0) {
                     d += -360
                   } else {
                     d += 360
                   }
                 }
                 area += OpenLayers.Util.rad(d) *
                         (2 + Math.sin(OpenLayers.Util.rad(p1.y)) +
                         Math.sin(OpenLayers.Util.rad(p2.y)));
             }
             area = area * 6378137.0 * 6378137.0 / 2.0;
         }
         return area;
     },

If you dont have then, then a polygon that crosses the 180 will get the 
incorrect area.

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