Tweeners

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Revision as of 09:23, 26 July 2007 by D4rk (talk)
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1 What is a Tween?

A Tween defines how an animation progresses from its initial value to its final value. The simplest way this can be accomplished is to go straight from start to finish in equal steps. This results in a smooth transition, however it starts and stops abruptly and tends to be a bit unnatural. Unnatural in the sense that, in the real world, you never see a linear transition. In the real world, transitions (movements, deformations, etc) are always accompanied by varying degrees of acceleration and deceleration. Some real world examples that come to mind: the movement of a pendulum, a ball bouncing, our breathing pattern, a bungee jump. Tweens basically try to mathematically recreate some of these transitions and can help add naturalism to animations.

1.1 What is Easing?

All tweens (except Linear) support an easing attribute that can be one of "in", "out", or "inout". The Quadratic tweener only supports "in" and "out". The default easing method is "out". Easing is basically the direction of the tween action. Looking at the various graphs below and trying the tweens out will make the concept of easing, easier (hehe, say that ten times in a row) to understand.

2 Supported Tweens

Currently, XBMC's skin engine supports eight different tweens: "linear", "quadratic", "bounce", "elastic", "cubic", "circle", "sine" and "back". They are set in an animation using the tween attribute.

2.1 Linear Tweener

Linear Tweener
Linear Animation


2.2 Quadratic Tweener

Quadratic Tweener Easing In
Quadratic Easing In Animation


Quadratic Tweener Easing Out
Quadratic Easing Out Animation


2.3 Bounce Tweener

Bounce Tweener Easing Out
Bounce Easing Out Animation


Bounce Tweener Easing InOut
Bounce Easing InOut Animation


Bounce Tweener Easing In
Bounce Easing In Animation


2.4 Elastic Tweener

Elastic Tweener Easing Out
Elastic Easing Out Animation


Elastic Tweener Easing InOut
Elastic Easing InOut Animation


Elastic Tweener Easing In
Elastic Easing In Animation


2.5 Cubic Tweener

Cubic Tweener Easing In
Cubic Easing In Animation


Cubic Tweener Easing InOut
Cubic Easing InOut Animation


Cubic Tweener Easing Out
Cubic Easing Out Animation


2.6 Sine Tweener

Sine Tweener Easing In
Cubic Sine In Animation


Sine Tweener Easing InOut
Sine Easing InOut Animation


Sine Tweener Easing Out
Sine Easing Out Animation


2.7 Circle Tweener

Circle Tweener Easing In


Circle Tweener Easing InOut


Circle Tweener Easing Out


2.8 Back Tweener

Back Tweener Easing In


Back Tweener Easing InOut


Back Tweener Easing Out