2 * Call generic wms service for GoogleMaps v2
3 * John Deck, UC Berkeley
4 * Inspiration & Code from:
5 * Mike Williams http://www.econym.demon.co.uk/googlemaps2/ V2 Reference & custommap code
6 * Brian Flood http://www.spatialdatalogic.com/cs/blogs/brian_flood/archive/2005/07/11/39.aspx V1 WMS code
7 * Kyle Mulka http://blog.kylemulka.com/?p=287 V1 WMS code modifications
8 * http://search.cpan.org/src/RRWO/GPS-Lowrance-0.31/lib/Geo/Coordinates/MercatorMeters.pm
10 * Modified by Chris Holmes, TOPP to work by default with GeoServer.
12 * Bundled with YM4R with John Deck's permission.
13 * Slightly modified to fit YM4R.
14 * See johndeck.blogspot.com for the original version and for examples and instructions of how to use it.
17 var WGS84_SEMI_MAJOR_AXIS = 6378137.0; //equatorial radius
18 var WGS84_ECCENTRICITY = 0.0818191913108718138;
19 var DEG2RAD=0.0174532922519943;
22 function dd2MercMetersLng(p_lng) {
23 return WGS84_SEMI_MAJOR_AXIS * (p_lng*DEG2RAD);
26 function dd2MercMetersLat(p_lat) {
27 var lat_rad = p_lat * DEG2RAD;
28 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)));
31 function addWMSPropertiesToLayer(tile_layer,base_url,layers,styles,format,merc_proj,use_geo){
32 tile_layer.format = format;
33 tile_layer.baseURL = base_url;
34 tile_layer.styles = styles;
35 tile_layer.layers = layers;
36 tile_layer.mercatorEpsg = merc_proj;
37 tile_layer.useGeographic = use_geo;
41 getTileUrlForWMS=function(a,b,c) {
42 var lULP = new GPoint(a.x*256,(a.y+1)*256);
43 var lLRP = new GPoint((a.x+1)*256,a.y*256);
44 var lUL = G_NORMAL_MAP.getProjection().fromPixelToLatLng(lULP,b,c);
45 var lLR = G_NORMAL_MAP.getProjection().fromPixelToLatLng(lLRP,b,c);
47 if (this.useGeographic){
48 var lBbox=lUL.x+","+lUL.y+","+lLR.x+","+lLR.y;
51 var lBbox=dd2MercMetersLng(lUL.x)+","+dd2MercMetersLat(lUL.y)+","+dd2MercMetersLng(lLR.x)+","+dd2MercMetersLat(lLR.y);
52 var lSRS="EPSG:" + this.mercatorEpsg;
54 var lURL=this.baseURL;
55 lURL+="?REQUEST=GetMap";
57 lURL+="&VERSION=1.1.1";
58 lURL+="&LAYERS="+this.layers;
59 lURL+="&STYLES="+this.styles;
60 lURL+="&FORMAT=image/"+this.format;
61 lURL+="&BGCOLOR=0xFFFFFF";
62 lURL+="&TRANSPARENT=TRUE";
67 lURL+="&reaspect=false";