X-Git-Url: https://git.openstreetmap.org/rails.git/blobdiff_plain/d87ea6863ad8d525d9320e6d1d13350f8263cf52..6ad1642dae301de389bdfdaacc5d88c83277b60a:/public/javascripts/site.js

diff --git a/public/javascripts/site.js b/public/javascripts/site.js
index 0e2c5aeb7..840617e17 100644
--- a/public/javascripts/site.js
+++ b/public/javascripts/site.js
@@ -1,4 +1,3 @@
-
 /*
  * Called as the user scrolls/zooms around to aniplate hrefs of the
  * view tab and various other links
@@ -69,15 +68,54 @@ function updatelinks(lon,lat,zoom,layers,minlon,minlat,maxlon,maxlat,objtype,obj
     }
   }
 
+  node = $("potlatchanchor");
+  if (node) {
+    var args = new Object();
+    args.editor = "potlatch";
+    args.lat = lat;
+    args.lon = lon;
+    args.zoom = zoom;
+    if (objtype && objid) {
+      args[objtype] = objid;
+    }
+    node.href = setArgs("/edit", args);
+  }
+
+  node = $("potlatch2anchor");
+  if (node) {
+    var args = new Object();
+    args.editor = "potlatch2";
+    args.lat = lat;
+    args.lon = lon;
+    args.zoom = zoom;
+    if (objtype && objid) {
+      args[objtype] = objid;
+    }
+    node.href = setArgs("/edit", args);
+  }
+
+  node = $("josmanchor");
+  if (node) {
+    var args = new Object();
+    args.editor = "josm";
+    args.lat = lat;
+    args.lon = lon;
+    args.zoom = zoom;
+    if (objtype && objid) {
+      args[objtype] = objid;
+    }
+    node.href = setArgs("/edit", args);
+  }
+
   node = $("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") {
+          typeof minlat == "number" &&
+          typeof maxlon == "number" &&
+          typeof maxlat == "number") {
 
         minlon = Math.round(minlon * decimals) / decimals;
         minlat = Math.round(minlat * decimals) / decimals;
@@ -216,33 +254,45 @@ function i18n(string, keys) {
   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));
-    // 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);
-    }
+    // 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);
+        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);
+        digit = (c2 >> (24 - 6 * (i - 5))) & 0x3f;
+        str += char_array.charAt(digit);
     }
     for (var i = 0; i < ((zoom + 8) % 3); ++i) {
-	str += "-";
+        str += "-";
     }
     return str;
 }