Add Google Map of voters

[selectricity-live] / vendor / plugins / ym4r_gm / javascript / wms-gs.js

diff --git a/vendor/plugins/ym4r_gm/javascript/wms-gs.js b/vendor/plugins/ym4r_gm/javascript/wms-gs.js
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+/*
+ * Call generic wms service for GoogleMaps v2
+ * John Deck, UC Berkeley
+ * Inspiration & Code from:
+ *     Mike Williams http://www.econym.demon.co.uk/googlemaps2/ V2 Reference & custommap code
+ *     Brian Flood http://www.spatialdatalogic.com/cs/blogs/brian_flood/archive/2005/07/11/39.aspx V1 WMS code
+ *     Kyle Mulka http://blog.kylemulka.com/?p=287  V1 WMS code modifications
+ *      http://search.cpan.org/src/RRWO/GPS-Lowrance-0.31/lib/Geo/Coordinates/MercatorMeters.pm
+ *
+ * Modified by Chris Holmes, TOPP to work by default with GeoServer.
+ *
+ * Bundled with YM4R with John Deck's permission.
+ * Slightly modified to fit YM4R.
+ * See johndeck.blogspot.com for the original version and for examples and instructions of how to use it.
+ */
+
+var WGS84_SEMI_MAJOR_AXIS = 6378137.0; //equatorial radius
+var WGS84_ECCENTRICITY = 0.0818191913108718138;
+var DEG2RAD=0.0174532922519943;
+var PI=3.14159267;
+
+function dd2MercMetersLng(p_lng) { 
+       return WGS84_SEMI_MAJOR_AXIS * (p_lng*DEG2RAD); 
+}
+
+function dd2MercMetersLat(p_lat) {
+        var lat_rad = p_lat * DEG2RAD;
+       return WGS84_SEMI_MAJOR_AXIS * Math.log(Math.tan((lat_rad + PI / 2) / 2) * Math.pow( ((1 - WGS84_ECCENTRICITY * Math.sin(lat_rad)) / (1 + WGS84_ECCENTRICITY * Math.sin(lat_rad))), (WGS84_ECCENTRICITY/2)));
+}
+
+function addWMSPropertiesToLayer(tile_layer,base_url,layers,styles,format,merc_proj,use_geo){
+   tile_layer.format = format;
+   tile_layer.baseURL = base_url;
+   tile_layer.styles = styles;
+   tile_layer.layers = layers;
+   tile_layer.mercatorEpsg = merc_proj;
+   tile_layer.useGeographic = use_geo;
+   return tile_layer;
+}
+
+getTileUrlForWMS=function(a,b,c) {
+       var lULP = new GPoint(a.x*256,(a.y+1)*256);
+       var lLRP = new GPoint((a.x+1)*256,a.y*256);
+       var lUL = G_NORMAL_MAP.getProjection().fromPixelToLatLng(lULP,b,c);
+       var lLR = G_NORMAL_MAP.getProjection().fromPixelToLatLng(lLRP,b,c);
+        
+       if (this.useGeographic){
+           var lBbox=lUL.x+","+lUL.y+","+lLR.x+","+lLR.y;
+          var lSRS="EPSG:4326";
+       }else{
+          var lBbox=dd2MercMetersLng(lUL.x)+","+dd2MercMetersLat(lUL.y)+","+dd2MercMetersLng(lLR.x)+","+dd2MercMetersLat(lLR.y);
+          var lSRS="EPSG:" + this.mercatorEpsg;
+        }
+       var lURL=this.baseURL;
+       lURL+="?REQUEST=GetMap";
+       lURL+="&SERVICE=WMS";
+       lURL+="&VERSION=1.1.1";
+       lURL+="&LAYERS="+this.layers;
+       lURL+="&STYLES="+this.styles; 
+       lURL+="&FORMAT=image/"+this.format;
+       lURL+="&BGCOLOR=0xFFFFFF";
+       lURL+="&TRANSPARENT=TRUE";
+       lURL+="&SRS="+lSRS;
+       lURL+="&BBOX="+lBbox;
+       lURL+="&WIDTH=256";
+       lURL+="&HEIGHT=256";
+       lURL+="&reaspect=false";
+       return lURL;
+}