vue-spritecore

A lightweight fully fledged Vuejs sprite-sheet animation render engine in a compact SFC plugin format

Table of contents

• Installation
• Usage
• Example
• Props
• Events

Installation

npm install --save vue-spritecore

Default import

Install for all the components (global registration):

import Vue from 'vue'
import VueSpritecore from 'vue-spritecore'

Vue.use(VueSpritecore)

new Vue({
  components: { App },
  template: '<App/>'
}).$mount('#app')

Use within a specific component (local registration):

import Vue from 'vue'
import { VueSpritecore } from 'vue-spritecore'

Vue.component('vue-spritecore', VueSpritecore)

Usage

Generate your spritesheet

• spritesheet: must be a valid image file (reccomended .png)
• json: animation-data in JSON Array format

You can generate the spritesheet also through any of the following online tools:

• https://www.codeandweb.com/free-sprite-sheet-packer
• https://www.leshylabs.com/apps/sstool/

---

Add the component

<vue-spritecore
    v-bind:id="'animation-id'"
    v-bind:spritesheet="require('./assets/spritesheet.png')"
    v-bind:json="require('./assets/animation-data/spritesheet-data.json')"
    v-bind:autoplay="true"
    v-bind:loop="true"


    v-on:ready="ready"
    ref="animation"

></vue-spritecore>

Wait for the animation to be ready then start animating

export default {
  name: 'app',

  mounted: function(){
  },
  methods: {
    ready: function(){
      this.$refs.animation.play();
    },
  }
}

Example

Props and methods syntax example

<template>
  <div id="app">
    <vue-spritecore
        v-bind:id="'animation-id'"
        v-bind:spritesheet="require('./assets/spritesheet.png')"
        v-bind:json="require('./assets/animation-data/spritesheet-data.json')"
        v-bind:autoplay="true"
        frameSorting="asc"
        v-bind:scaleX="0.6"
        v-bind:scaleY="0.6"
        v-bind:loop="true"
        v-bind:lowerBound="0"
        v-bind:upperBound="100"

        v-on:ready="ready"
        v-on:animationStarted="animationStarted(...arguments)"
        v-on:animationStopped="animationStopped(...arguments)"
        v-on:animationReset="animationReset(...arguments)"
        v-on:animationOver="animationOver(...arguments)"

        ref="animation"

    ></vue-spritecore>
  </div>
</template>

<script>

export default {
  name: 'app',

  mounted: function(){
    this.$refs.animation.play();            //play the animation from frame _lowerBound_ to _upperBound_
    this.$refs.animation.play(5, 40);       //play the animation from frame 5 to frame 40
    this.$refs.animation.stop();            //stop(freeze) the animation
    this.$refs.animation.reset();           //reset the animation at frame _lowerBound_
    this.$refs.animation.reset(10);         //reset the animation at frame 10
    this.$refs.animation.playLegacy(30);    //play the animation through the legacy animator with constant framerate of 30
  },
  methods: {
    ready: function(){
      console.log('animation ready');
    },
    animationStarted: function(startFrame, stopFrame){
    console.log('animation started:['+startFrame+','+stopFrame+']');
    },
    animationStopped: function(frame){
    console.log('animation stopped at frame: '+frame);
    },
    animationReset: function(frame){
     console.log('animation resetted at frame: '+frame);
    },
    animationOver: function(frame){
     console.log('animation over at frame:'+frame);
    },

  }
}
</script>

Props

• spritesheet (required) : path to the animation sprite-sheet
• json (required): path to the json animation data
• id : render canvas id
• frameSorting: frame sorting method when arranging the frames from the provided json. It determines the animation direction.
• scaleX: animation scale on the x-axis
• scaleY *: animation scale on the y-axis
• autoplay : automatic animation play
• loop: restart animation automatically at lowerBound
• lowerBound : global animation start frame cursor
• upperBound : global animation end frame cursor
  
  

Name	Required	Type [ allowable params ]	Default
spritesheet	true	String	-
json	true	String	-
id	false	String	vue-spritecore-canvas
frameSorting	false	String [ 'asc', 'desc']	'asc'
scaleX	false	Number	1
scaleY	false	Number	1
autoplay	false	Boolean	false
loop	false	Boolean	true
lowerBound	false	Number	0
upperBound	false	Number	animationLength

Methods

• play(from, to) : plays the animation from frame (from) to frame (to) . If no parameter is provided the animation is played from lowerBound to upperBound
• stop(): stops (freezes) the animation at the point in time it's invoked
• reset(to): resets the animation at frame (to) . If no parameter is provided the animation is resetted at frame lowerBound
• playLegacy(frameRate): plays the animation through the legacy animator at a constant framerate (frameRate)
  
  

Name	Arguments	Default
play	from (optional), to (optional)	from: lowerBound, to: animationLength
stop	-	-
reset	to (optional)	to: lowerBound
playLegacy	framerate (optional)	60

In most of the cases it is not recommended to run the animation at a predefined constant framerate (through the playLegacy method) using a delta time based timing fn. A good explanation has already been given here .

Note: playLegacy() doesn't support autoplay or loop yet. The autoplay props utilize the default render method that allows the browser to optimize the animation framerate .

Events

• ready : assets has been loaded and animation is ready
• animationStarted : animation started
• animationStopped : animation stopped
• animationReset : animation has been reset
• animationOver : animation is over
  
  

Name	Arguments
ready	-
animationStarted	startFrame, stopFrame
animationStopped	frame
animationReset	frame
animationOver	frame

---

License

MIT