+ node.href = 'javascript:alert("zoom in to see editing history");';
+ node.style.fontStyle = 'italic';
+ }
+ }
+
+ node = document.getElementById("shortlinkanchor");
+ if (node) {
+ var args = getArgs(node.href);
+ var code = makeShortCode(lat, lon, zoom);
+ var prefix = shortlinkPrefix();
+
+ // Add ?{node,way,relation}=id to the arguments
+ if (objtype && objid) {
+ args[objtype] = objid;
+ }
+
+ // This is a hack to omit the default mapnik layer (B000FTF) from
+ // the shortlink. B000FTFT is then the "Object" layer which we get
+ // on /?{node,way,relation}=id
+ if (layers && (layers != "B000FTF") && (layers != "B000FTFT")) {
+ args["layers"] = layers;
+ }
+
+ // Here we're assuming that all parameters but ?layers= and
+ // ?{node,way,relation}= can be safely omitted from the shortlink
+ // which encodes lat/lon/zoom. If new URL parameters are added to
+ // the main slippy map this needs to be changed.
+ if (args["layers"] || args[objtype]) {
+ node.href = setArgs(prefix + "/go/" + code, args);
+ } else {
+ node.href = prefix + "/go/" + code;
+ }
+ }
+}
+
+/*
+ * Get the URL prefix to use for a short link
+ */
+function shortlinkPrefix() {
+ if (window.location.hostname.match(/^www\.openstreetmap\.org/i)) {
+ return "http://osm.org";
+ } else {
+ return "";
+ }
+}
+
+/*
+ * Called to get the arguments from a URL as a hash.
+ */
+function getArgs(url) {
+ var args = new Object();
+ var querystart = url.indexOf("?");
+
+ if (querystart >= 0) {
+ var querystring = url.substring(querystart + 1);
+ var queryitems = querystring.split("&");
+
+ for (var i = 0; i < queryitems.length; i++) {
+ if (match = queryitems[i].match(/^(.*)=(.*)$/)) {
+ args[unescape(match[1])] = unescape(match[2]);
+ } else {
+ args[unescape(queryitems[i])] = null
+ }
+ }
+ }
+
+ return args;
+}
+
+/*
+ * Called to set the arguments on a URL from the given hash.
+ */
+function setArgs(url, args) {
+ var queryitems = new Array();
+
+ for (arg in args)
+ {
+ if (args[arg] == null) {
+ queryitems.push(escape(arg));
+ } else {
+ queryitems.push(escape(arg) + "=" + escape(args[arg]));
+ }
+ }
+
+ return url.replace(/\?.*$/, "") + "?" + queryitems.join("&");
+}
+
+/*
+ * Called to get a CSS property for an element.
+ */
+function getStyle(el, property) {
+ var style;
+
+ if (el.currentStyle) {
+ style = el.currentStyle[property];
+ } else if( window.getComputedStyle ) {
+ style = document.defaultView.getComputedStyle(el,null).getPropertyValue(property);
+ } else {
+ style = el.style[property];
+ }
+
+ return style;
+}
+
+/*
+ * Called to interpolate JavaScript variables in strings using a
+ * similar syntax to rails I18n string interpolation - the only
+ * difference is that [[foo]] is the placeholder syntax instead
+ * of {{foo}} which allows the same string to be processed by both
+ * rails and then later by javascript.
+ */
+function i18n(string, keys) {
+ for (var key in keys) {
+ var re_key = '\\[\\[' + key + '\\]\\]';
+ var re = new RegExp(re_key, "g");
+
+ string = string.replace(re, keys[key]);
+ }
+
+ return string;
+}
+
+function makeShortCode(lat, lon, zoom) {
+ char_array = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789_@";
+ var x = Math.round((lon + 180.0) * ((1 << 30) / 90.0));
+ var y = Math.round((lat + 90.0) * ((1 << 30) / 45.0));
+ // hack around the fact that JS apparently only allows 53-bit integers?!?
+ // note that, although this reduces the accuracy of the process, it's fine for
+ // z18 so we don't need to care for now.
+ var c1 = 0, c2 = 0;
+ for (var i = 31; i > 16; --i) {
+ c1 = (c1 << 1) | ((x >> i) & 1);
+ c1 = (c1 << 1) | ((y >> i) & 1);
+ }
+ for (var i = 16; i > 1; --i) {
+ c2 = (c2 << 1) | ((x >> i) & 1);
+ c2 = (c2 << 1) | ((y >> i) & 1);
+ }
+ var str = "";
+ for (var i = 0; i < Math.ceil((zoom + 8) / 3.0) && i < 5; ++i) {
+ digit = (c1 >> (24 - 6 * i)) & 0x3f;
+ str += char_array.charAt(digit);
+ }
+ for (var i = 5; i < Math.ceil((zoom + 8) / 3.0); ++i) {
+ digit = (c2 >> (24 - 6 * (i - 5))) & 0x3f;
+ str += char_array.charAt(digit);
projects / rails.git / blobdiff