ease, bouncebegin, bounceend

stepmania/Themes/default/Scripts/Actor.lua

@@ -1,3 +1,55 @@
+function Actor:ease(t, fEase)
+	-- Optimizations:
+	-- fEase = -100 is equivalent to TweenAccelerate.
+	if fEase == -100 then
+		self:accelerate(t);
+		return;
+	end
+
+	-- fEase = 0 is equivalent to TweenLinear.
+	if fEase == 0 then
+		self:linear(t);
+		return;
+	end
+
+	-- fEase = +100 is equivalent to TweenDecelerate.
+	if fEase == 100 then
+		self:decelerate(t);
+		return;
+	end
+
+	self:tween( t, TweenBezier,
+		{
+			0,
+			scale(fEase, -100, 100, 0/3, 2/3),
+			scale(fEase, -100, 100, 1/3, 3/3),
+			1
+		}
+	);
+end
+
+local BounceBeginBezier =
+{
+	0, 0,
+	0.42, -0.42,
+	2/3, 0.3,
+	1, 1
+}
+function Actor:bouncebegin(t)
+	self:tween( t, TweenBezier, BounceBeginBezier );
+end
+
+local BounceEndBezier =
+{
+	0,0,
+	1/3, 0.7,
+	0.58, 1.42,
+	1, 1
+}
+function Actor:bounceend(t)
+	self:tween( t, TweenBezier, BounceEndBezier );
+end
+
 -- Hide if b is true, but don't unhide if b is false.
 function Actor:hide_if(b)
 	if b then