aframe-animation-component

Animations in A-Frame using anime.js

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aframe-animation-component

An animation component for A-Frame using anime.js.
Also check out the animation-timeline componentanimationtimeline for defining and orchestrating timelines of animations.
animation
Latest version requires A-Frame v0.8.0.

API

Properties

| Property | Description | Default Value | Values | | -------- | ----------- | ------------- | ------ | | property | Property to animate. Can be a component name, a dot-delimited property of a component (e.g., material.color), or a plain attribute. | | | | isRawProperty | Flag to animate an arbitrary object property outside of A-Frame components for better performance. If set to true, for example, we can set property to like components.material.material.opacity. If property starts with components or object3D, this will be inferred to true. | false | | | from | Initial value at start of animation. If not specified, the current property value of the entity will be used (will be sampled on each animation start). It is best to specify a from value when possible for stability. | null | | | to | Target value at end of animation. | null | | | type | Right now only supports color for tweening isRawProperty color XYZ/RGB vector values. | '' | | | delay | How long (milliseconds) to wait before starting. | 0 | | | dir | Which dir to go from from to to. | normal | alternate, reverse | | dur | How long (milliseconds) each cycle of the animation is. | 1000 | | | easing | Easing function of animation. To ease in, ease out, ease in and out. | easeInQuad | See easings | | elasticity | How much to bounce (higher is stronger). | 400 | | | loop | How many times the animation should repeat. If the value is true, the animation will repeat infinitely. | 0 | | | round | Whether to round values. | false | | | startEvents | Comma-separated list of events to listen to trigger play/restart. Animation will not autoplay if specified. | null | | | pauseEvents | Comma-separated list of events to listen to trigger pause. Can be resumed with resumeEvents. | null | | | resumeEvents | Comma-separated list of events to listen to trigger resume after pausing. | null | | | autoplay | Whether or not the animation should autoplay. Should be specified if the animation is defined for the animation-timeline componentanimationtimeline. | null | | | enabled | Toggle startEvents effect. | true |

Multiple Animations

Base name is animation. We can attach multiple animations to one entity by name-spacing the component with double underscores (__):
<a-entity animation="property: rotation"
          animation__2="property: position"
          animation__color="property: material.color"></a-entity>

Easings

| easeIn | easeOut | easeInOut |---------------|----------------|------------------| | easeInQuad | easeOutQuad | easeInOutQuad | | easeInCubic | easeOutCubic | easeInOutCubic | | easeInQuart | easeOutQuart | easeInOutQuart | | easeInQuint | easeOutQuint | easeInOutQuint | | easeInSine | easeOutSine | easeInOutSine | | easeInExpo | easeOutExpo | easeInOutExpo | | easeInCirc | easeOutCirc | easeInOutCirc | | easeInBack | easeOutBack | easeInOutBack | | easeInElastic | easeOutElastic | easeInOutElastic |

Events

| Property | Description | | -------- | ----------- | | animationbegin | Animation began. Event detail contains name of animation. | | animationcomplete | Animation completed. Event detail contains name of animation. |

Members

| Member | Description | |-----------|------------------| | animation | anime.js object. |

Using anime.js Directly

anime is a popular and powerful animation engine. The component prefers to do just basic tweening and touches only the surface of what anime can do (e.g., timelines, motion paths, progress, seeking). If we need more animation features, create a separate component that uses anime.js directly. anime is accessible via AFRAME.anime.
Read through and explore the anime.js documentation and website.

Installation

Browser

Install and use by directly including the browser files:
<head>
  <title>My A-Frame Scene</title>
  <script src="https://aframe.io/releases/0.8.0/aframe.min.js"></script>
  <script src="https://unpkg.com/aframe-animation-component@^4.1.2/dist/aframe-animation-component.min.js"></script>
</head>

<body>
  <a-scene>
    <a-entity geometry="primitive: box" material="color: black"
              animation__color="property: material.color; dir: alternate; dur: 1000;
                                easing: easeInSine; loop: true; to: #FFF">
    </a-entity>

    <a-entity geometry="primitive: box" material="color: orange"
              animation__fadein="property: material.opacity; dur: 100;
                                  easing: linear; from 0; to: 1; startEvents: fadein"
              animation__fadeout="property: material.opacity; dur: 100;
                                  easing: linear; from 1; to: 0; startEvents: fadeout"
    </a-entity>

    <a-cylinder color="#F55" radius="0.1"
                animation="property: color; dir: alternate; dur: 1000;
                           easing: easeInSine; loop: true; to: #5F5"
                animation__scale="property: scale; dir: alternate; dur: 200;
                           easing: easeInSine; loop: true; to: 1.2 1 1.2"
                animation__yoyo="property: position; dir: alternate; dur: 1000;
                                 easing: easeInSine; loop: true; to: 0 2 0">
    </a-cylinder>

  </a-scene>
</body>

npm

Install via npm:
npm install aframe-animation-component

Then register and use.
require('aframe');
require('aframe-animation-component');

Versus <a-animation>

I expect to deprecate <a-animation> in favor for this component.
  • Imperative Ergonomics: Imperatively set animations and all of its
properties with a single setAttribute call. With <a-animation>, we must do createElement, multiple setAttributes, appendChild, and addEventListener('loaded').
  • Performance: The animation component takes advantage of shortcut updates of
positions, rotations, and scales. In later versions of A-Frame, A-Frame allows us to performantly modify these transformation properties without going through the whole .setAtttribute flow.
  • Synchronous: Setting a component is synchronous, meaning it takes effect
immediately. With <a-animation>, we must wait for it to append to the DOM and register a callback listener.
  • Consistency with the Framework: The animation component fits into
A-Frame's entity-component-system framework. The <a-animation> tag is the only outlier in which we must use a DOM element to modify an entity.
  • Simpler API: The animation component uses anime.js, a popular and simple
JavaScript animation library. <a-animation>'s API is loosely based off of Web Animations draft specification which is overly complex.
  • Easier Maintenance: The animation component uses A-Frame's component API
as well as anime.js. <a-animation> uses the Custom Element polyfill directly with tween.js. anime.js's features makes the animation codebase much slimmer (140 vs 550 lines of code).
  • Features: The animation component has the features of the newly popular
anime.js library (e.g., color interpolation).
  • Faster Development: Being detached from the A-Frame core library means faster
iteration of features. Due to being easier to maintain, having more features, and not being tied to A-Frame versions, we can add things quickly such as timeline support.
  • anime.js: anime.js has great performance over Tween.js and tons of great
animation features.
  • Less Bugs: <a-animation> has not been touched in ages. This component
has lesss issues filed against it, and people usually end up switching to the component once they run into issues with <a-animation>.