Tilemap.createDynamicLayer would fail if you called it without setting the x and y arguments, even though they were flagged as being optional. Fix phaserjs#4508

Author: photonstorm

CHANGELOG.md

@@ -123,6 +123,7 @@ The following changes took place in the Pointer class:
 * Changing the `radius` of an Arc Game Object wouldn't update the size, causing origin issues. It now updates the size and origin correctly in WebGL. Fix #4542 (thanks @@PhaserEditor2D)
 * Setting `padding` in a Text style configuration object would cause an error about calling split on undefined. Padding can now be applied both in the config and via `setPadding`.
 * `Tilemap.createBlankDynamicLayer` would fail if you provided a string for the tileset as the base tile width and height were incorrectly read from the tileset argument. Fix #4495 (thanks @jppresents)
+* `Tilemap.createDynamicLayer` would fail if you called it without setting the `x` and `y` arguments, even though they were flagged as being optional. Fix #4508 (thanks @jackfreak)
 
 ### Examples, Documentation and TypeScript
 

src/tilemaps/Tilemap.js

@@ -561,8 +561,16 @@ var Tilemap = new Class({
         this.currentLayerIndex = index;
 
         //  Default the x/y position to match Tiled layer offset, if it exists.
-        if (x === undefined && this.layers[index].x) { x = this.layers[index].x; }
-        if (y === undefined && this.layers[index].y) { y = this.layers[index].y; }
+
+        if (x === undefined)
+        {
+            x = layerData.x;
+        }
+
+        if (y === undefined)
+        {
+            y = layerData.y;
+        }
 
         var layer = new DynamicTilemapLayer(this.scene, this, index, tileset, x, y);