Update map_coordinates.md

research/map_coordinates.md

@@ -1,3 +1,7 @@
+# Conversions to 2D Map
+
+*Code samples in C#*
+
 Conversion of a Level coordinate into a 2D map coordinate:
 ```csharp
 private double ToMapCoordinate(double val) {
@@ -15,4 +19,69 @@ private double ToMapCoordinate(double val) {
 
 	return (41.0 / c) * ((val) / 2048.0) + 1;
 }
-```
+```
+
+# Conversions to Long/Lat (eg Leaflets/Google Maps)
+
+*Code samples in PHP*
+
+You can translate the `levels.exd` values to Long/Lat using the `x`, `y` and **scale** would be the maps ` [size_factor](https://github.com/viion/XIV-Datamining/blob/master/offsets/3.1_list.txt#L679)`
+
+```
+function mapsRadiansToDegrees($rad)
+{
+    return $rad / (pi() / 180);
+}
+
+function mapsTranslateXYZtoLatLong($x, $y, $scale = 100)
+{
+    $scale = $scale / 100;
+    $tilesize = 2048 / $scale;
+
+    $pixelsPerLonDegree = $tilesize / 360;
+    $pixelsPerLonRadian = $tilesize / (2 * pi());
+
+    $lng = $x / $pixelsPerLonDegree;
+    $latRadians = $y / -$pixelsPerLonRadian;
+    $lat = mapsRadiansToDegrees(2 * atan(exp($latRadians)) - pi() / 2);
+
+    return [
+        'x' => $lng,
+        'y' => $lat,
+    ];
+}
+```
+
+To translate a `levels.exd` position to an in-game X/Y:
+
+```
+function mapsTranslateXYZToGame($x, $y, $scale, $tilescale = 50)
+{
+    $map = 2048 / ($scale / 100);
+    
+    $TileCount = $map / $tilescale;
+    
+    $x = ceil(round(($x / $tilescale) + ($TileCount / 2),1));
+    $y = ceil(round(($y / $tilescale) + ($TileCount / 2),1));
+    
+    return [
+        'x' => $x,
+        'y' => $y,
+    ];
+}
+```
+
+And finally, to translate an in game X/Y to a `levels.exd` position which can then be converted to a 2D or Long/Lat:
+
+```
+function mapsTranslateGameToXYZ($x, $y)
+{
+	$x = ($x*50)-25-1024;
+	$y = ($y*50)-25-1024;
+	
+	return [
+	    'x' => $x,
+	    'y' => $y,
+	];
+}
+```