Revert "Effects: Remove additional parameters of easings"

This reverts commit 41a04e59df5beac4ca61b3b5e3a6b078b6aee1ac.

1 files changed, 10 insertions, 5 deletions

diff --git a/src/effects/Tween.js b/src/effects/Tween.js
index 4e85e3c51..33edf10f3 100644
--- a/src/effects/Tween.js
+++ b/src/effects/Tween.js
@@ -27,12 +27,17 @@ Tween.prototype = {
 			Tween.propHooks._default.get( this );
 	},
 	run: function( percent ) {
-		var hooks = Tween.propHooks[ this.prop ];
+		var eased,
+			hooks = Tween.propHooks[ this.prop ];
 
-		this.pos = this.options.duration ?
-			jQuery.easing[ this.easing ]( percent ) :
-			percent;
-		this.now = ( this.end - this.start ) * this.pos + this.start;
+		if ( this.options.duration ) {
+			this.pos = eased = jQuery.easing[ this.easing ](
+				percent, this.options.duration * percent, 0, 1, this.options.duration
+			);
+		} else {
+			this.pos = eased = percent;
+		}
+		this.now = ( this.end - this.start ) * eased + this.start;
 
 		if ( this.options.step ) {
 			this.options.step.call( this.elem, this.now, this );