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js-frame-animation

v1.0.0

Published

A frame animation library

Downloads

4

Readme

animation

通常我们会遇到一些需求,用js实现一组动画(这里指的是由一帧帧图片组合而成的动画,非jq的animate)。

其实原理很简单,如果是多张图,就定时去改变image的src,如果是一张图,就定时改变backgroud-position;同时,我们还要支持图片预加载,动画执行次数(一次,n次,无限次),动画暂停,动画执行完成的回调等等。

有了上述需求,我觉得写一个通用的animation库还是很有必要的,这样用户就每必要为每一组动画写逻辑了,从繁琐的劳动中解放,不正是每个coder所期望的么:)

示例:

var positions = [
 '120 0', '240 0', '360 0'
]

var imglist = ['./horse.jpg']
var rabbitEle = document.querySelector('#rabbit')

var rabbit = animation(imglist)
.changePosition(rabbitEle, positions, './horse.jpg')
.repeat(4)
rabbit.start(time * 10)
setTimeout(() => {
  rabbit.pause()
}, 2000);
setTimeout(() => {
  rabbit.restart()
}, 3000);

changePosition(ele, positions, imageUrl) // 改变元素的 background-position 实现帧动画

changeUrl(ele, imgList) // 通过改变图片元素的URL 实现帧动画

repeat(times) // 动画执行的次数 times为空时无限循环

wait(time) // 动画的等待时间

then(callback) // 自定义执行任务

start(interval) // 动画开始执行,interval 表示动画执行的间隔 默认为16.7ms

pause() // 动画暂停

restart() // 动画从上一次暂停处重新执行