Merge pull request #1199 from codevinsky/feature/rectangle-aabb

Rectangle.aabb

src/geom/Rectangle.js

@@ -838,6 +838,47 @@ Phaser.Rectangle.union = function (a, b, output) {
 
 };
 
+/**
+* Calculates the Axis Aligned Bounding Box (or aabb) from an array of points.
+*
+* @method Phaser.Rectangle#aabb
+* @param {Phaser.Point[]} points - The array of one or more points.
+* @param {Phaser.Rectangle} [out] - Optional Rectangle to store the value in, if not supplied a new Rectangle object will be created.
+* @return {Phaser.Rectangle} The new Rectangle object.
+* @static
+*/
+Phaser.Rectangle.aabb = function(points, out) {
+
+    if (typeof out === "undefined") {
+        out = new Phaser.Rectangle();
+    }
+
+    var xMax = Number.MIN_VALUE,
+        xMin = Number.MAX_VALUE,
+        yMax = Number.MIN_VALUE,
+        yMin = Number.MAX_VALUE;
+
+    points.forEach(function(point) {
+        if (point.x > xMax) {
+            xMax = point.x;
+        }
+        if (point.x < xMin) {
+            xMin = point.x;
+        }
+
+        if (point.y > yMax) {
+            yMax = point.y;
+        }
+        if (point.y < yMin) {
+            yMin = point.y;
+        }
+    });
+
+    out.setTo(xMin, yMin, xMax - xMin, yMax - yMin);
+
+    return out;
+};
+
 //   Because PIXI uses its own Rectangle, we'll replace it with ours to avoid duplicating code or confusion.
 PIXI.Rectangle = Phaser.Rectangle;
 PIXI.EmptyRectangle = new Phaser.Rectangle(0, 0, 0, 0);