openlayers 画圆

    addCircle:function(lon,lat,radius,_id){

        var point=new OpenLayers.Geometry.Point(lon, lat);
        
        
         var circle = new OpenLayers.Feature.Vector(new OpenLayers.Geometry.Polygon.createRegularPolygon(point,radius/100000,40,0));
         circle.id=”circle_”+_id;
         this.vectors.addFeatures([circle], {silent: true});
    },

转载自：https://blog.csdn.net/javaisthis/article/details/6735742