asefa
v0.3.0
Published
js library for aseprite exported spritesheet frame animation
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asefa
js library to manage aseprite exported json spritesheet frame animation
Install
npm i asefa
Example (ESM & canvas)
See exec result: https://codesandbox.io/s/asefa-canvas-example-ix01gf?file=/src/index.js:0-1557
import { Spritesheet, FrameAnimator } from 'asefa'
import { loadImg } from './helpers'
const ssImageSrc = 'path/to/your/spritesheet.png'
const ssJsonSrc = 'path/to/your/spritesheet.json'
;(async () => {
// Set up canvas
const canvas = document.querySelector('#screen')
const ctx = canvas.getContext('2d')
// Load spritesheet-image & spritesheet-json
const [asess, ssImage] = await Promise.all([
new Spritesheet().load(ssJsonSrc),
loadImg(ssImageSrc),
])
// Let all animations loop
Object.values(asess.animations).forEach(anim => {
anim.loop = true
})
// Create animator
const animator = new FrameAnimator(asess)
// Setup loop
{
let _last = 0
const loop = now => {
// Update animation
animator.update(now - _last)
// Clear canvas
ctx.fillStyle = 'white'
ctx.fillRect(0, 0, canvas.width, canvas.height)
// Use frame to draw sprite
const frameRect = animator.currentFrame
if (frameRect) {
ctx.drawImage(
ssImage,
frameRect.x,
frameRect.y,
frameRect.width,
frameRect.height,
0,
0,
canvas.width,
canvas.height
)
}
// Update vars for next loop
_last = now
requestAnimationFrame(loop)
}
loop(0)
}
// Play animation
animator.gotoAndPlay('walk_front')
})()Example (Browser & CSS sprite)
<body>
<main>
<div id="ss-display" class="sprite"></div>
</main>
<script src="path/to/asefa.js"></script>
<script defer>
;(async () => {
// Load ss-json
const asess = await new asefa.Spritesheet().load(
'path/to/your-cool-ss.json'
)
// Set up DOM to show sprite
const el = document.getElementById('ss-display')
el.style.background = `url(${'path/to/your-cool-ss.png'})`
el.style.imageRendering = 'pixelated' // Assuming pixel-art (not necessary)
// Update DOM to match frame
const frame = asess.frames[1]
el.style.width = `${frame.width}px`
el.style.height = `${frame.height}px`
el.style.backgroundPosition = `-${frame.x}px -${frame.y}px`
})()
</script>
</body>See examples for more.
Documentation
TODO
Development
Setup
npm install
Build
- Dev build:
npm run devornpm start - Production build:
npm run build - Package:
npm run pack
Test
npm run test
Prerequisites
- Tested aseprite version: v1.2.3-x64