User:Timothy Gu/common.js

/* Replace external links to GeoHack with direct links to a single mapping provider. * * It support the following replacement variables found in GeoHack: * {latdegdec} {londegdec} {scale} {span} {osmzoom} * * Maintainer: User:Dispenser * Released into the Public Domain */ function replaceGeoHack{ var mapprovider = "http://maps.google.com/maps?ll={latdegdec},{londegdec}&spn={span},{span}&q={latdegdec},{londegdec}"; //var mapprovider = "http://www.openstreetmap.org/index.html?mlat={latdegdec}&mlon={londegdec}&zoom={osmzoom}&layers=B000FTF"; var geohack_base = "http://toolserver.org/~geohack/geohack.php"; var coord_filter = /&params=([\d.+-]+)_([\d.+-]*)_?([\d.+-]*)_?([NSZ])_([\d.+-]+)_([\d.+-]*)_?([\d.+-]*)_?([EOW])([^&=]*)/; var link, lat, lon, scale; var links = document.getElementsByTagName('A'); for(var i=0; (link=links[i]); i++){ if(link.href.indexOf(geohack_base)==0 && coord_filter.exec(link.href)) { // latitude and longitude lat=(1.0*RegExp.$1) + ((RegExp.$2||0)/60.0) + ((RegExp.$3||0)/3600.0); if(RegExp.$4!='N') lat*=-1; lon=(1.0*RegExp.$5) + ((RegExp.$6||0)/60.0) + ((RegExp.$7||0)/3600.0); if(RegExp.$8=='W') lon*=-1; // Determine scale/zoom var params = RegExp.$9; if(/_globe:(?!earth|_|$)/i.test(params)) continue; if(/_type:(adm3rd|city|mountain|isle|river|waterbody)/.test(params))scale = 100000; else if(/_type:(event|forest|glacier)/.test(params))scale = 50000; else if(/_type:(airport|edu|pass|landmark|railwaystation)/.test(params))scale = 10000; else scale = 300000; if(/_dim:([\d.+-]+)(km)?m?/.exec(params))scale = RegExp.$1 * (RegExp.$2?10000:10); if(/_scale:(\d+)(_|$)/.exec(params))scale = RegExp.$1; var osmzoom = 18 - Math.round(Math.log(scale/1693) / Math.log(2)); var zoom = Math.log( 1.5e8/scale) / Math.log(2); // Replace link link.href=mapprovider.replace(/\{latdegdec\}/g, lat).replace(/\{londegdec\}/g, lon).replace(/\{scale\}/g, scale) .replace(/\{span\}/g, scale/1e6).replace(/\{osmzoom\}/g, osmzoom).replace(/\{zoom\}/g, zoom); }	} } if(doneOnloadHook) replaceGeoHack; //imported dynamically else addOnloadHook(replaceGeoHack);