X-Git-Url: https://git.openstreetmap.org/rails.git/blobdiff_plain/d3c60874092c63b493818f227f31027327b595e3..81d38e1aed6dbe5d5fd5dceac1c6bb00beb3e138:/public/javascripts/site.js

diff --git a/public/javascripts/site.js b/public/javascripts/site.js
index d381c0231..813b3ae92 100644
--- a/public/javascripts/site.js
+++ b/public/javascripts/site.js
@@ -1,87 +1,107 @@
-//Called as the user scrolls/zooms around.
-//Maniplate hrefs of the view tab and various other links
-function updatelinks(lon,lat,zoom,layers,extents) {
+/*
+ * Called as the user scrolls/zooms around to aniplate hrefs of the
+ * view tab and various other links
+ */
+function updatelinks(lon,lat,zoom,layers,minlon,minlat,maxlon,maxlat,objtype,objid) {
   var decimals = Math.pow(10, Math.floor(zoom/3));
   var node;
 
   lat = Math.round(lat * decimals) / decimals;
   lon = Math.round(lon * decimals) / decimals;
 
-  node = document.getElementById("permalinkanchor");
-  if (node) {
-    var args = getArgs(node.href);
-    args["lat"] = lat;
-    args["lon"] = lon;
-    args["zoom"] = zoom;
-    if (layers) {
-      args["layers"] = layers;
-    }
-    node.href = setArgs(node.href, args);
+  if (minlon) {
+    minlon = Math.round(minlon * decimals) / decimals;
+    minlat = Math.round(minlat * decimals) / decimals;
+    maxlon = Math.round(maxlon * decimals) / decimals;
+    maxlat = Math.round(maxlat * decimals) / decimals;
   }
 
-  node = document.getElementById("viewanchor");
-  if (node) {
-    var args = getArgs(node.href);
-    args["lat"] = lat;
-    args["lon"] = lon;
-    args["zoom"] = zoom;
-    if (layers) {
-      args["layers"] = layers;
+  $$(".geolink").each(function (link) {
+    var args = getArgs(link.href);
+
+    if (link.hasClassName("llz")) {
+      args.lat = lat;
+      args.lon = lon;
+      args.zoom = zoom;
+    } else if (minlon && link.hasClassName("bbox")) {
+      args.bbox = minlon + "," + minlat + "," + maxlon + "," + maxlat;
     }
-    node.href = setArgs(node.href, args);
-  }
 
-  node = document.getElementById("exportanchor");
+    if (layers && link.hasClassName("layers")) {
+      args.layers = layers;
+    }
+
+    if (objtype && link.hasClassName("object")) {
+      args[objtype] = objid;
+    }
+
+    if (link.hasClassName("minzoom[0-9]+")) {
+      $w(link.className).each(function (classname) {
+        if (match = classname.match(/^minzoom([0-9]+)$/)) {
+          var minzoom = match[1];
+          var name = link.id.replace(/anchor$/, "");
+
+          if (zoom >= minzoom) {
+            link.onclick = null;
+            link.title = i18n("javascripts.site." + name + "_tooltip");
+            link.removeClassName("disabled");
+          } else {
+            link.onclick = function () { alert(i18n("javascripts.site." + name + "_zoom_alert")); return false; };
+            link.title = i18n("javascripts.site." + name + "_disabled_tooltip");
+            link.addClassName("disabled");
+          }
+        }
+      });
+    }
+
+    link.href = setArgs(link.href, args);
+  });
+
+  node = $("shortlinkanchor");
   if (node) {
     var args = getArgs(node.href);
-    args["lat"] = lat;
-    args["lon"] = lon;
-    args["zoom"] = zoom;
-    if (layers) {
+    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 from the shortlink.
+    if (layers && layers != "M") {
       args["layers"] = layers;
     }
-    node.href = setArgs(node.href, args);
-  }
+    else {
+      delete args["layers"];
+    }
 
-  node = document.getElementById("editanchor");
-  if (node) {
-    if (zoom >= 11) {
-      var args = new Object();
-      args.lat = lat;
-      args.lon = lon;
-      args.zoom = zoom;
-      node.href = setArgs("/edit", args);
-      node.style.fontStyle = 'normal';
+    // 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 = 'javascript:alert("zoom in to edit map");';
-      node.style.fontStyle = 'italic';
+      node.href = prefix + "/go/" + code;
     }
   }
-  
-  node = document.getElementById("historyanchor");
-  if (node) {
-    if (zoom >= 11) {
-      var args = new Object();
-      //conjure a bounding box centred at the lat/lon.
-      //TODO: feed actual bounds of the window through to here somehow.
-      minlon = extents.left;
-      minlat = extents.bottom;
-      maxlon = extents.right;
-      maxlat = extents.top;
-      minlon = Math.round(minlon * decimals) / decimals;
-      minlat = Math.round(minlat * decimals) / decimals;
-      maxlon = Math.round(maxlon * decimals) / decimals;
-      maxlat = Math.round(maxlat * decimals) / decimals;
-      args.bbox = minlon + "," + minlat + "," + maxlon + "," + maxlat;
-      node.href = setArgs("history/", args);
-      node.style.fontStyle = 'normal';
-    } else {
-      node.href = 'javascript:alert("zoom in to see editing history");';
-      node.style.fontStyle = 'italic';
-    }
+}
+
+/*
+ * 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("?");
@@ -102,6 +122,9 @@ function getArgs(url) {
   return args;
 }
 
+/*
+ * Called to set the arguments on a URL from the given hash.
+ */
 function setArgs(url, args) {
    var queryitems = new Array();
 
@@ -117,6 +140,9 @@ function setArgs(url, args) {
    return url.replace(/\?.*$/, "") + "?" + queryitems.join("&");
 }
 
+/*
+ * Called to get a CSS property for an element.
+ */
 function getStyle(el, property) {
   var style;
 
@@ -130,3 +156,66 @@ function getStyle(el, 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) {
+  string = i18n_strings[string] || string
+
+  for (var key in keys) {
+    var re_key = '\\[\\[' + key + '\\]\\]';
+    var re = new RegExp(re_key, "g");
+
+    string = string.replace(re, keys[key]);
+  }
+
+  return string;
+}
+
+/*
+ * Called to interlace the bits in x and y, making a Morton code.
+ */
+function interlace(x, y) {
+    x = (x | (x << 8)) & 0x00ff00ff;
+    x = (x | (x << 4)) & 0x0f0f0f0f;
+    x = (x | (x << 2)) & 0x33333333;
+    x = (x | (x << 1)) & 0x55555555;
+
+    y = (y | (y << 8)) & 0x00ff00ff;
+    y = (y | (y << 4)) & 0x0f0f0f0f;
+    y = (y | (y << 2)) & 0x33333333;
+    y = (y | (y << 1)) & 0x55555555;
+
+    return (x << 1) | y;
+}
+
+/*
+ * Called to create a short code for the short link.
+ */
+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));
+    // JavaScript only has to keep 32 bits of bitwise operators, so this has to be
+    // done in two parts. each of the parts c1/c2 has 30 bits of the total in it
+    // and drops the last 4 bits of the full 64 bit Morton code.
+    var str = "";
+    var c1 = interlace(x >>> 17, y >>> 17), c2 = interlace((x >>> 2) & 0x7fff, (y >>> 2) & 0x7fff);
+    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);
+    }
+    for (var i = 0; i < ((zoom + 8) % 3); ++i) {
+        str += "-";
+    }
+    return str;
+}