getDirection returns reversed direction

if horizontal direction is negative, it should return “Left”, not
“Right”.

this resulted in direction and offsetDirection properties to have
opposite values

src/input.js

@@ -220,8 +220,8 @@ function computeIntervalInputData(session, input) {
         velocity, velocityX, velocityY, direction;
 
     if (input.eventType != INPUT_CANCEL && (deltaTime > COMPUTE_INTERVAL || last.velocity === undefined)) {
-        var deltaX = last.deltaX - input.deltaX;
-        var deltaY = last.deltaY - input.deltaY;
+        var deltaX = input.deltaX - last.deltaX;
+        var deltaY = input.deltaY - last.deltaY;
 
         var v = getVelocity(deltaTime, deltaX, deltaY);
         velocityX = v.x;
@@ -326,9 +326,9 @@ function getDirection(x, y) {
     }
 
     if (abs(x) >= abs(y)) {
-        return x > 0 ? DIRECTION_LEFT : DIRECTION_RIGHT;
+        return x < 0 ? DIRECTION_LEFT : DIRECTION_RIGHT;
     }
-    return y > 0 ? DIRECTION_UP : DIRECTION_DOWN;
+    return y < 0 ? DIRECTION_UP : DIRECTION_DOWN;
 }
 
 /**