Changeset 536 for trunk/london.npemap.org.uk

Timestamp:

Apr 30, 2007, 10:31:28 AM (14 years ago)

Author:

Nick Burch

Message:

Pad the grid numbers properly

Location:

trunk/london.npemap.org.uk

Files:

• index.html (modified) (1 diff)
• js/mapTiles.js (modified) (2 diffs)

trunk/london.npemap.org.uk/index.html

@@ -51 +51 @@
         var tile_y_offset = y - (tile_y*24);
 
-        // Always seem to be 1 tile too far to the right
+        // Always seem to be 1 tile too far to the right, and 1 too high
         tile_x -= 1;
+        tile_y -= 1;
 
         location.href="/tiles.html#"+tile_x+","+tile_y+",1";

trunk/london.npemap.org.uk/js/mapTiles.js

@@ -73 +73 @@
         var grid_e = Math.floor(gmc_easting/1000);
         var grid_n = Math.floor(gmc_northing/1000);
-        var offset_e = Math.round(gmc_easting - (grid_e*1000));
-        var offset_n = Math.round(gmc_northing - (grid_n*1000));
+        var offset_e = trimThreeDigits(Math.round(gmc_easting - (grid_e*1000)));
+        var offset_n = trimThreeDigits(Math.round(gmc_northing - (grid_n*1000)));
         // Need to go from top left, not bottom left
         grid_n = 16 - grid_n;
@@ -349 +349 @@
 }
 
+function trimThreeDigits(string) {
+        // If we have a 4+ digit number, no need to do any padding
+        if(parseInt(string) >= 1000) { return string; }
+
+        // Pad it so that it'll always have leading 0s, and be at least 3 long
+        str = '000' + string
+        // Grab the right most 3 digits, which will have any required padding
+        return str.substring(str.length -3)
+}
 function trimSixDigits(string) {
         // If we have a 7 digit number, no need to do any padding