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frame-animation

v0.2.6

Published

a common animation lib

Downloads

18

Readme

animation

npm

例子在这里

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:)

Usage

npm 安装

$ npm install frame-animation

示例

HTML

<div id="demo"></div>

CSS

#demo {
    width: 100px;
    height: 100px;
    background: url('foo.png');
}

JavaScript

var animation = require("frame-animation");

var ele = document.getElementById('demo');
var frameMap = ['0 0', '0 -100', '0 -200'];
    
var demoAnimation = animation().changePosition(ele, positions).repeat();
    demoAnimation.start(200);

这种链式调用的语法,是不是很爽呢(妈妈再也不用担心我的动画)

animation提供的接口

  • loadImage(imagelist) //预加载图片
  • changePosition(ele,positions) //通过改变元素的backgroud-position实现动画
  • changeSrc(ele,imglist) //通过改变image元素的src实现动画(一般这种方式需要和loadImage配合使用)
  • then(callback) //动画执行完成后的回调函数
  • enterFrame(callback) //每一帧动画执行的函数,相当于用户可以自定义每一帧动画的callback
  • repeat(times) //动画重复执行的次数,times为空时表示无限次
  • repeatForever() //无限重复上一次动画, 相当于repeat(),更友好的一个接口吧
  • wait(time) //每个动画执行完后等待的时间
  • start(interval) //动画开始执行,interval表示动画执行的间隔
  • pause() //动画暂停
  • restart() //动画从上一次暂停处重新执行
  • dispose() //释放资源

如何构建

animation的源码是基于webpack构建的

首先,clone项目源码

git clone https://github.com/ustbhuangyi/animation.git

安装依赖

cd animation
npm install

测试demo页

npm run dev

打开浏览器访问如下地址, 查看效果

localhost:9090