1 files changed, 19 insertions, 19 deletions

diff --git a/game/plugins/orientation.js b/game/plugins/orientation.js
index 77ad9fc..af5a649 100644
--- a/game/plugins/orientation.js
+++ b/game/plugins/orientation.js
@@ -13,26 +13,26 @@ var Orientation = function() {
 
 	var threshhold = 15;
 
-	var processOrientationEvent = function(event) {
-		if (event.gamma < -threshhold && previousEvent.gamma >= -threshhold) {
-			this.onLeft.dispatch();
-		}
-		if (event.gamma > threshhold && previousEvent.gamma <= threshhold) {
-			this.onRight.dispatch();
-		}
-		if (event.beta < -threshhold && previousEvent.beta >= -threshhold) {
-			this.onUp.dispatch();
-		}
-		if (event.beta > threshhold && previousEvent.beta <= threshhold) {
-			this.onDown.dispatch();
-		}
-
-
-		previousEvent = event;
+	if (window.DeviceOrientationEvent) {
+		window.addEventListener('deviceorientation', function(event) {
+			if (event.gamma < -threshhold && previousEvent.gamma >= -threshhold) {
+				this.onLeft.dispatch();
+			}
+			if (event.gamma > threshhold && previousEvent.gamma <= threshhold) {
+				this.onRight.dispatch();
+			}
+			if (event.beta < -threshhold && previousEvent.beta >= -threshhold) {
+				this.onUp.dispatch();
+			}
+			if (event.beta > threshhold && previousEvent.beta <= threshhold) {
+				this.onDown.dispatch();
+			}
+
+			previousEvent.gamma = event.gamma;
+			previousEvent.beta = event.beta;
+		});
 	}
-
-	window.addEventListener('deviceorientation', processOrientationEvent);
-}
+};
 
 
 module.exports = Orientation;