Only hardcode http://osm.org/ in shortlinks when we're at

[rails.git] / public / javascripts / site.js

diff --git a/public/javascripts/site.js b/public/javascripts/site.js
index 95c0b938e3938fe89675fbabd2d55302ccef78b2..f9c3e7a54e823bb4500876ccd5b42a50506b242b 100644 (file)
--- a/public/javascripts/site.js
+++ b/public/javascripts/site.js
@@ -1,4 +1,8 @@
-function updatelinks(lon,lat,zoom,layers) {
+/*
+ * 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, obj_type, obj_id) {
   var decimals = Math.pow(10, Math.floor(zoom/3));
   var node;
 
@@ -14,6 +18,9 @@ function updatelinks(lon,lat,zoom,layers) {
     if (layers) {
       args["layers"] = layers;
     }
+    if (obj_type && obj_id) {
+      args[obj_type] = obj_id;
+    }
     node.href = setArgs(node.href, args);
   }
 
@@ -43,7 +50,7 @@ function updatelinks(lon,lat,zoom,layers) {
 
   node = document.getElementById("editanchor");
   if (node) {
-    if (zoom >= 11) {
+    if (zoom >= 13) {
       var args = new Object();
       args.lat = lat;
       args.lon = lon;
@@ -55,6 +62,64 @@ function updatelinks(lon,lat,zoom,layers) {
       node.style.fontStyle = 'italic';
     }
   }
+  
+  node = document.getElementById("historyanchor");
+  if (node) {
+    if (zoom >= 11) {
+      var args = new Object();
+      //set bbox param from 'extents' object
+      if (typeof minlon == "number" &&
+         typeof minlat == "number" &&
+         typeof maxlon == "number" &&
+         typeof maxlat == "number") {
+      
+        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';
+    }
+  }
+
+  node = document.getElementById("shortlinkanchor");
+  if (node) {
+    var args = getArgs(node.href);
+    var code = makeShortCode(lat, lon, zoom);
+    var prefix = shortlinkPrefix();
+
+    // little hack. may the gods of hardcoding please forgive me, or 
+    // show me the Right way to do it.
+    if (layers && (layers != "B000FTF")) {
+      args["layers"] = layers;
+      node.href = setArgs(prefix + "/go/" + code, args);
+    } else {
+      node.href = prefix + "/go/" + code;
+    }
+  }
+}
+
+
+/*
+ * This is a hack to hardcode opestreetmap.org -> osm.org in the
+ * shortlink
+ */
+function shortlinkPrefix() {
+    var hostname = window.location.hostname;
+    var normalized_hostname = hostname.replace(/^:www\./i,'');
+    var prefix = '';
+
+    if (normalized_hostname.match(/^openstreetmap\.org$/i)) {
+        prefix = "http://osm.org";
+    }
+
+    return prefix;
 }
 
 function getArgs(url) {
@@ -77,6 +142,9 @@ 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();
 
@@ -92,6 +160,9 @@ function setArgs(url, args) {
    return url.replace(/\?.*$/, "") + "?" + queryitems.join("&");
 }
 
+/*
+ * Called to get the arguments from a URL as a hash.
+ */
 function getStyle(el, property) {
   var style;
 
@@ -105,3 +176,52 @@ 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) {
+  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);
+    }
+    for (var i = 0; i < ((zoom + 8) % 3); ++i) {
+       str += "=";
+    }
+    return str;
+}