【threejs + Vue】写一个不怎么酷炫的3D图片轮播组件 -【附组件源码 + 注释】

2020/4/17 5:06:34

本文主要是介绍【threejs + Vue】写一个不怎么酷炫的3D图片轮播组件 -【附组件源码 + 注释】,对大家解决编程问题具有一定的参考价值,需要的程序猿们随着小编来一起学习吧!

前言

写这个组件的主要动机是想整点活(绝对不是因为自己鸽了两年没写文章(迫真)(笑)),顺便把自己这段时间来积累的一些知识用一下,加深一下印象,不然就快要忘光了(虽然迟早得忘(⌐■_■)–︻╦╤─)。

然后写的是一个Vue组件,你问为什么不是像以前那样写原生js插件?一个字:懒(理直气壮),当然最直接的原因是我一开始写的时候就是用的vue,所以后面就懒得改了(( ̄ー ̄)),如果不是用的vue的童鞋可以自己去还原,把this什么的弄一下,接口位置对上应该就可以直接用了。

因为组件内用了threejs和tweenjs,记得npm install

npm install --save three @tweenjs/tween.js

废话就讲到这里了,下面介绍一下组件内主要的一些参数,具体细节和逻辑不会讲,因为很烦,所以你们自己去看代码吧。大部分地方注释都打了,对threejs没研究的同学就不要去深究相应部分的代码,因为很难看懂

演示

codepen
寇得喷打不开的可以看下面的地址
jsrun

代码介绍

逻辑代码主要分为两部分,一部分是在外部定义的一些局部变量和方法(这里主要是用于保存一些我不希望你能直接碰到的变量和方法等等,如:scene,还有就是在vue data下面挂载属性过多的对象容易出现性能问题) 第二部分就是在vue内部定义的一些属性和方法(以_开头的方法也是我不希望你直接调用的东西,这里大部分都是中间逻辑的处理方法,所以你如果没看懂就尽量不要动)

下面介绍一些控制相关的属性

props下面的属性不讲,基本上都能看懂,然后每个图片对应的item数据结构格式如下:

{
  src: '', // 链接,必填
  size: [], // 选填, 当前图片对应的在X轴和Y轴上的立方体的数目,默认是[16, 9](data属性的defaultSize),也是大部分图片的宽高比,当然这两个值并不是一定要写到没有约数,比如[32, 18],或者[24, 10]都是可以的,但我不建议数目写太大,主要是浪费性能,还有就是没有在一个size时候过渡好看
  animate: {
    name: '', // 图片过渡动画选择的动画种类,目前我只写了三种translate(平移)/cover(覆盖)/fade(变淡)
    type: '', // 在上面name确定动画种类以后,在其内部选择相应的动画小类, 如name是fade,type可以选择In,Out,InOut和OutIn, 具体参数可以在_animateImage方法下面查看
    duration: 3000, // 持续时间,
    delay: 0, // 延时
    easing: TWEEN.Easing.Quadratic.In // tweenjs 内置的动画曲线类型
  }
}

data下面的属性:

// 将canvas的精度放大多少倍, 主要是为了保证图片不失真,以宽为200,高为100的canvas举例,直接效果就等同于
// <canvas width="600" height="300" style="width: 200px; height: 100px;">
canvasScale: 3,
// webgl canvas, 用于保存绘制3D效果的canvas element
canvas: null,
// 绘图canvas, 当前图片对应离屏canvas
imageCanvas: null,
// 容器
wrapper: null,
// 是否当前资源正在加载中,用于控制行为进行
cvLoading: true,
// 当前是否正在动画中, 防止频繁切换
isAnimating: false,
// webGl canvas尺寸
cWidth: 0,
cHeight: 0,
// 当前图片尺寸
iWidth: 0,
iHeight: 0,
// 当前场景的横纵比,用于计算,会根据当前图片的情况变化,不用动
size: [16, 9],
// 默认横纵比,这里也是用来动态计算canvas高度的东西,使画布宽高比为16/9,在mounted里面有用到,
// 再就是在传入的item数据里如果没有设置size的时候,也被拿来当成默认值,此值是可以修改的,可以实际根据需要数值进
// 行修改,比如我的项目里大部分的图片都是正方形的,那我可以把defaultSize设置成[10, 10]
defaultSize: [16, 9],
// 当前图片序号,自动计算,不用手动修改。如果你想从第1张图片直接跳到第3张,调用changeImage方法就行了,这里会自动变化
currentIndex: 0,
// 动态计算的容器高度
acHeight: 0,
// 偏移延迟,主要用于进行动画过渡时,由于动画效果需要耗费的额外延时时间将保存到这里,存最大值(计算用,不用管)
offsetDelay: 0,
// 下面的属性基本上都是用来控制立方体各个阶段的动画效果和时间的,可以手动设置
// 注意:这里不控制图片的动画,仅仅是立方体的动画而已,动画流程为: 
// 隐藏hidden(如果本张图片的size比上一张图片的size要小,不需要用到那么多立方体,则多余的立方体会先进行过渡隐藏)-> 变化change -> 开始定位start -> 完成定位end
// 内置的物体运动相关的控制参数
hiddenOption: {
  duration: 2000,
  delay: 0,
  easing () {
    return TWEEN.Easing.Quadratic.InOut
  }
},
changeOption: {
  duration: 2000,
  delay: 0,
  easing () {
    return TWEEN.Easing.Quadratic.Out
  }
},
startOption: {
  duration: 1000,
  delay: 0,
  easing () {
    return TWEEN.Easing.Quadratic.Out
  }
},
endOption: {
  duration: 500,
  delay: 0,
  easing () {
    return TWEEN.Easing.Quadratic.In
  }
},
// 一次动作完成后经过多少ms进行下一次动作
spaceTime: 3000,
// 立方体之间的间隔, 由于3D视角的原因,实际上cube之间的距离不一定是设定值那么宽
cubeSpace: 0,
// 当进行图片切换时,每个立方体进行移动的边界范围(在changeTween方法里有用到)
cubeChangeRange: {
  useAnimation: true, // 是否进行中间的过渡动画
  delay: 100, // 随机延迟时间范围
  x: 800, // 偏移值基准,下同 (实际使用时不一定会全部用到)
  y: 400,
  z: 100
}

methods下面的方法:

initCanvas:初始化3d场景中的一些必要元素
updateSize: 更新各部分尺寸,主要在容器尺寸变化后需要进行自适应时调用
changeImage(idx): 切换图片,传入对应item的下标
update: 动画循环,不用管
toNext: 下一张图片
toPrev: 上一张图片
play: 进行自动播放时会被调用,可以通过修改props传入的auto值进行自动播放
_getChangeTweenMoveData: 获取一个change过渡的运动变化参数,随机返回一组效果,具体动画逻辑在局部变量的moveData里面
_changeUVs: 更新各立方体的uv贴图
_initCube: 处理立方体的生成和复用以及初始化
_animateCube: 复用立方体的时候,在用于图片size变化导致立方体大小需要重新计算的时候提供一个平滑的动画过渡
_initPosition: 按照行为流程开始计算并运动所有立方体
_hiddenTween: 多余立方体的隐藏动画处理
_startTween: 基本确定各立方体应在位置后进行的动画处理
_endTween: 最后完成各立方体位置移动的动画
_changeTween: 开始进行图片切换时按照得到的运动参数打乱所有立方体位置的过渡动画
_initImage: 开始进行图片切换时的一些处理
_switchImage: 图片开始切换
_animateImage: 图片切换的动画处理,内部包含了所有的切换效果,在item数据的name和type属性要用到的参数在此方法内部可找到
_loadImages,_loadImage: 图片加载处理

浏览器要求

chrome内核要69以上,不然会产生不支持离屏canvas这样的bug,纹理不会被渲染
IE爬

组件源码(尻♂过去就能用(手动滑稽)):

<template>
  <section class="slider-3d c--slider-3d">
    <!--注意这里的v-resize是监听窗口变化的指令,你们没有的得自己写一下-->
    <div class="slider-3d-box"
         ref="wrapper"
         :style="{height: acHeight + 'px'}"
         v-resize="updateSize"
    >
      <canvas id="slider-3d-cv" ref="canvas"></canvas>
    </div>
  </section>
</template>

<script>
  import * as THREE from 'three'
  const TWEEN = require('@tweenjs/tween.js').default
  // 定义场景,渲染器,相机变量
  let [scene, renderer, camera] = Array.of(null, null, null)
  // 定义材质,纹理变量
  let [material, texture] = Array.of(null, null)
  // 定义存放立方体的队列
  let meshs = []
  // 定义相机在初始位置确定后在Z轴上的偏移量(为了给视角留空间,值越小,视野范围内的物体看起来越大)
  const offsetZ = 25
  // 定义图片发生切换动作时存放上一张图片的变量
  let prevImage = null
  // 存放生成的离屏canvas
  let drawImages = []
  // 拉远镜头
  function farCamera () {
    // 保存初始数据
    let {x, y, z} = camera.position
    let pos = {x, y, z}
    camera.userData.pos = {...pos}
    new TWEEN.Tween(pos)
      .to({...pos, z: pos.z * 1.4}, 1500)
      .easing(TWEEN.Easing.Quadratic.Out)
      .onUpdate(() => {
        camera.position.set(pos.x, pos.y, pos.z)
      })
      .start()
  }
  // 还原镜头
  function restoreCamera () {
    let {x, y, z} = camera.position
    let pos = {x, y, z}
    let target = camera.userData.pos
    if (!target) return false
    if (pos.x === target.x && pos.y === target.y && pos.z === target.z) return false
    new TWEEN.Tween(pos)
      .to({...target}, 1500)
      .easing(TWEEN.Easing.Quadratic.Out)
      .onUpdate(() => {
        camera.position.set(pos.x, pos.y, pos.z)
      })
      .start()
  }
  // 存放当前图片切换时的过渡动画类型
  const moveType = {
    // 随机
    random (range) {
      return {
        x: -range.x / 2 + Math.random() * range.x,
        y: -range.y / 2 + Math.random() * range.y,
        z: -range.z / 2 + Math.random() * range.z,
        delay: Math.random () * range.delay >> 0
      }
    },
    // 排序延时,左下
    orderDelayLB (range, i, j, size) {
      farCamera()
      let [ox, oy] = size
      return {
        x: -10 - (ox - i) * 5,
        y: -15 - (oy - j) * 5,
        z: range.z / 10,
        delay: Math.min(range.delay, 100) / 2 * (i + j)
      }
    },
    // 排序延时,左上
    orderDelayLT (range, i, j, size) {
      farCamera()
      let [ox, oy] = size
      return {
        x: -10 - (ox - i) * 5,
        y: 15 + j * 5,
        z: range.z / 10,
        delay: Math.min(range.delay, 100) / 2 * (i + (oy - j))
      }
    },
    // 排序延时,右下
    orderDelayRB (range, i, j, size) {
      farCamera()
      let [ox, oy] = size
      return {
        x: 10 + i * 5,
        y: -15 - (oy - j) * 5,
        z: range.z / 10,
        delay: Math.min(range.delay, 100) / 2 * ((ox - i) + j)
      }
    },
    // 排序延时, 右上
    orderDelayRT (range, i, j, size) {
      farCamera()
      let [ox, oy] = size
      return {
        x: 10 + i * 5,
        y: 15 + j * 5,
        z: range.z / 10,
        delay: Math.min(range.delay, 100) / 2 * ((ox - i) + (oy - j))
      }
    }
  }
  let changeArr = []
  for (let key in moveType) {
    changeArr.push(key)
  }
  // 类型索引
  let changeIndex = 0
  // 过渡动画旋转的随机数, 0代表旋转,其他不进行旋转
  let rotationIndex = 0
  // 旋转方向
  let rotationDirection = -1
  // 定时器和动画停止变量(用于销毁对象)
  let timer = null
  let stoped = false
  // 当前动画运行待完成的小方块数据
  let cubeAniComplete = 0
  export default {
    name: 'Slider3D',
    props: {
      // 图片
      items: {
        type: Array,
        default: () => ({})
      },
      // 是否预加载图片
      preload: {
        type: Boolean,
        default: true
      },
      // 是否自动播放
      auto: {
        type: Boolean,
        default: true
      },
      // 是否反向
      reverse: {
        type: Boolean,
        default: false
      }
    },
    data () {
      return {
        // 将canvas的精度放大多少倍,最多不会超过原图片的精度
        canvasScale: 3,
        // webgl canvas
        canvas: null,
        // 绘图canvas
        imageCanvas: null,
        // 容器
        wrapper: null,
        // 是否当前资源正在加载中
        cvLoading: true,
        // 当前是否正在动画中, 防止频繁切换
        isAnimating: false,
        // webGl canvas尺寸
        cWidth: 0,
        cHeight: 0,
        // 当前图片尺寸
        iWidth: 0,
        iHeight: 0,
        // 当前场景的横纵比
        size: [16, 9],
        // 默认横纵比
        defaultSize: [16, 9],
        // 当前图片序号
        currentIndex: 0,
        // 动态计算的容器高度
        acHeight: 0,
        // 内置的物体运动相关的控制参数
        hiddenOption: {
          duration: 2000,
          delay: 0,
          easing () {
            return TWEEN.Easing.Quadratic.InOut
          }
        },
        changeOption: {
          duration: 2000,
          delay: 0,
          easing () {
            return TWEEN.Easing.Quadratic.Out
          }
        },
        // 偏移延迟,主要用于进行动画过渡时,由于动画效果需要耗费的额外延时时间将保存到这里,存最大值
        offsetDelay: 0,
        startOption: {
          duration: 1000,
          delay: 0,
          easing () {
            return TWEEN.Easing.Quadratic.Out
          }
        },
        endOption: {
          duration: 500,
          delay: 0,
          easing () {
            return TWEEN.Easing.Quadratic.In
          }
        },
        // 一次动作完成后经过多少ms进行下一次动作
        spaceTime: 3000,
        // 立方体之间的间隔, 由于3D视角的原因,实际上cube之间的距离不一定是设定值那么宽
        cubeSpace: 0,
        // 当进行场景切换时,每个立方体进行移动的边界范围(在changeTween方法里有用到)
        cubeChangeRange: {
          useAnimation: true, // 是否进行中间的过渡动画
          delay: 100, // 随机延迟时间范围
          x: 800, // 偏移值基准,下同 (实际使用时不一定会全部用到)
          y: 400,
          z: 100
        }
      }
    },
    computed: {
      // 当前配置下动画的总持续时间, 自定义每张图片的切换时间不会超过这个时间
      animateDuration () {
        let change = this.changeOption || {}
        let start = this.startOption || {}
        let end = this.endOption || {}
        return (change.duration || 1000) + (change.delay || 0)
          + (start.duration || 1000) + (start.delay || 0)
          + (end.duration || 1000) + (end.delay || 0) + this.offsetDelay
      }
    },
    created () {},
    mounted () {
      this.canvas = this.$refs.canvas
      this.wrapper = this.$refs.wrapper
      // let [ww, wh] = [window.innerWidth, window.innerHeight]
      let w = this.wrapper.clientWidth
      this.acHeight = w * this.defaultSize[1] / this.defaultSize[0]
      // 进行传入数据检测
      this.items.forEach((item) => {
        if (Object.prototype.toString.call(item) !== '[object Object]' && !item.src)
          throw new Error('传入数据中存在不合法数据')
      })
      // 初始化部分变量
      stoped = false
      changeIndex = 0
      this.currentIndex = 0
      prevImage = null
      drawImages = []
      this.$nextTick(() => {
        this.updateSize()
        this.initCanvas()
        requestAnimationFrame((time) => {
          this.update(time)
        })
        // 图片一次加载完成
        if (this.preload) {
          meshs = []
          drawImages = []
          prevImage = null
          this._loadImages(() => {
            this.cvLoading = false
            // 切换到第一张图片
            this.changeImage(0)
          })
          return false
        }
        this.changeImage(0)
      })
    },
    beforeDestroy () {
      stoped = true
      clearTimeout(timer)
      texture && texture.dispose()
      if (material) {
        material.dispose()
        material.map.dispose()
      }
      meshs.forEach((mesh) => {
        mesh.geometry.dispose()
        mesh.material.dispose()
      })
      texture = null
      material = null
      meshs = []
      scene && scene.dispose()
    },
    methods: {
      initCanvas () {
        // 场景
        scene = new THREE.Scene()
        // 渲染器
        renderer = new THREE.WebGLRenderer({
          canvas: this.canvas,
          alpha: true,
          antialias: true,
          logarithmicDepthBuffer: true
        })
        renderer.setClearColor(0xFFFFFF)
        renderer.setSize(this.cWidth * this.canvasScale, this.cHeight * this.canvasScale)
        this.canvas.style.width = this.cWidth + 'px'
        this.canvas.style.height = this.cHeight + 'px'
        // 相机
        camera = new THREE.PerspectiveCamera(60, this.cWidth / this.cHeight, 1, 10000)
        let cH = this.cHeight / 2
        let z = cH * Math.sqrt(3) + offsetZ
        camera.position.set(0, 0, z)
        camera.lookAt(new THREE.Vector3(0, 0, 0))
      },
      updateSize () {
        if (!this.wrapper) return false
        this.cWidth = this.wrapper.clientWidth
        this.acHeight = this.cWidth * 9 / 16
        this.cHeight = this.acHeight
        renderer && renderer.setSize(this.cWidth * this.canvasScale, this.cHeight * this.canvasScale)
        this.canvas.style.width = this.cWidth + 'px'
        this.canvas.style.height = this.cHeight + 'px'
        if (camera) {
          camera.aspect = this.cWidth / this.cHeight
          let cH = this.cHeight / 2
          let z = cH * Math.sqrt(3) + offsetZ
          camera.position.set(0, 0, z)
          camera.lookAt(new THREE.Vector3(0, 0, 0))
          camera.updateProjectionMatrix()
        }
      },
      changeImage (idx) {
        // 当前动画正在运行的情况
        if (this.isAnimating) return false
        // 当前资源正在加载的情况
        if (this.cvLoading) return false
        // 传入idx是非数字的时候
        if (Number.isNaN(idx * 1) || idx === null) return false
        // 不存在相应对象的情况
        let item = this.items[idx]
        if (!item || !item.src) return false
        this.currentIndex = idx
        // 如果canvas已存在,且图片链接一致的情况下,直接进行切换操作,无需加载
        let canvas = drawImages[idx]
        this.isAnimating = true
        if (canvas && canvas._imgElement && item.src === canvas._imgElement.src) {
          this._initImage()
          return false
        }
        // 否则判断为对应图片未加载或发生变化,需要重新进行加载
        this.cvLoading = true
        this._loadImage(item, idx, () => {
          this.cvLoading = false
          this._initImage()
        })
      },
      update (time) {
        if (stoped) return false
        requestAnimationFrame((time) => {
          this.update(time)
        })
        renderer.render(scene, camera)
        meshs.forEach((item) => {
          let ud = item.userData
          for (let key in ud) {
            if (!key.includes('group')) continue
            ud[key].update(time)
          }
        })
        TWEEN.update(time)
      },
      toNext () {
        let idx = this.currentIndex + 1 >= this.items.length ? 0 : this.currentIndex + 1
        this.changeImage(idx)
      },
      toPrev () {
        let idx = this.currentIndex - 1 < 0 ? this.items.length - 1 : this.currentIndex - 1
        this.changeImage(idx)
      },
      play () {
        if (!this.auto) return false
        timer = setTimeout(() => {
          if (stoped) return false
          this.reverse ? this.toPrev() : this.toNext()
        }, this.spaceTime)
      },
      _getChangeTweenMoveData ({i = 0, j = 0}) {
        let range = this.cubeChangeRange || {}
        if (!range.useAnimation) return { x: 0, y: 0, z: 0, delay: 0 }
        return moveType[changeArr[changeIndex]](range, i, j, this.size)
      },
      _changeUVs (geometry, ux, uy, ox, oy) {
        if (!geometry || !geometry.attributes || !geometry.attributes.uv) return false
        let uvs = geometry.attributes.uv.array
        let saveUVs = [...uvs]
        for (let i = 0; i < uvs.length; i += 2) {
          uvs[i] = (uvs[i] + ox) * ux
          uvs[i + 1] = (uvs[i + 1] + oy) * uy
        }
        return saveUVs
      },
      _initCube () {
        let [x, y] = this.size
        if (x <= 0 || y <= 0) return false
        // 计算每个立方体的尺寸(注意:用图片尺寸来计算,不是容器尺寸)
        let [xSize, ySize] = [this.iWidth / x, this.iHeight / y]
        // 复用或初始化纹理
        texture = texture || new THREE.CanvasTexture(this.imageCanvas)
        // 复用或初始化材质
        material = material || new THREE.MeshBasicMaterial({
          map: texture
        })
        // 创建cube
        for (let i = 0; i < x; i++) {
          for (let j = 0; j < y; j++) {
            let geometry = new THREE.BoxBufferGeometry(xSize, ySize, xSize)
            // 如果已存在对应序号的对象,则复用已存在的对象,跳过生成
            if (meshs[i * y + j]) {
              let mesh = meshs[i * y + j]
              mesh.userData.i = i
              mesh.userData.j = j
              mesh.geometry.attributes.uv.array = new Float32Array([...mesh.userData.uvs])
              // 更新uv
              // this._changeUVs(geometry, 1 / x, 1 / y, i, j)
              // mesh.geometry = geometry
              this._changeUVs(mesh.geometry, 1 / x, 1 / y, i, j)
              mesh.geometry.attributes.uv.needsUpdate = true
              let { width, height } = mesh.geometry.parameters
              // 动画缩放立方体尺寸
              this._animateCube(mesh, xSize / width, ySize / height)
              continue
            }
            // 修改每个cube的uv偏移和缩放
            let saveUVs = this._changeUVs(geometry, 1 / x, 1 / y, i, j)
            // 生成新立方体,保存序号信息等并随机调整初始位置
            let mesh = new THREE.Mesh(geometry, material)
            mesh.userData.i = i
            mesh.userData.j = j
            mesh.userData.uvs = [...saveUVs]
            // 保存到立方体队列便于操作
            meshs[i * y + j] = mesh
            let markX = (Math.random() * 800 >> 0) % 2 === 0 ? -1 : 1
            let markY = (Math.random() * 100 >> 0) % 2 === 0 ? -1 : 1
            mesh.position.set(
              Math.random() * (markX * 200) + (markX * this.cWidth),
              Math.random() * (markY * 200) + (markY * this.cHeight),
              -50 + Math.random() * 100
            )
            scene.add(mesh)
          }
        }
      },
      _animateCube (mesh, scaleX, scaleY) {
        let { x, y } = mesh.scale
        let group = new TWEEN.Group()
        mesh.userData.group5 = group
        let data = { x, y }
        new TWEEN.Tween(data, group)
          .to({
            x: scaleX,
            y: scaleY
          }, 2000)
          .easing(TWEEN.Easing.Quadratic.In)
          .onUpdate(() => {
            mesh.scale.set(data.x, data.y, data.x)
          })
          .start()
      },
      _initPosition () {
        // 获取尺寸用于每个立方体偏移位置的计算
        let [xNum, yNum] = this.size
        let [xSize, ySize] = [this.iWidth / xNum, this.iHeight / yNum]
        cubeAniComplete = xNum * yNum
        for (let index = meshs.length - 1; index >= 0; index--) {
          let mesh = meshs[index]
          // 如果出现立方体个数多余的情况,将此次图片显示中多余不用的立方体移到屏幕外并隐藏
          if (index >= (xNum * yNum))  {
            this._hideenTween(mesh)
            continue
          }
          // 立方体显示
          mesh.visible = true
          // 计算位置
          let {i, j} = mesh.userData
          // 偏移计算单位
          let divideX = xNum / 2 - 0.5
          let divideY = yNum / 2 - 0.5
          let offsetX = i - divideX
          let offsetY = j - divideY
          // 计算立方体旋转的时候在X轴上占的最大位置
          let rotateXLength = Math.sqrt(2) * xSize
          // 立方体动画更新
          this._changeTween(mesh, offsetX, offsetY, rotateXLength, xSize, ySize)
        }
      },
      _hideenTween (mesh) {
        let {x, y, z} = mesh.position
        let data = {
          x, y, z
        }
        let group = mesh.userData.group4 || new TWEEN.Group()
        mesh.userData.group4 = group
        let markX = (Math.random() * 400 >> 0) % 2 === 0 ? -1 : 1
        let markY = (Math.random() * 600 >> 0) % 2 === 0 ? -1 : 1
        let opt = this.hiddenOption || {}
        let easing = typeof opt.easing === 'function' ? opt.easing() : (opt.easing || TWEEN.Easing.Quadratic.InOut)
        new TWEEN.Tween(data, group)
          .to({
            x: Math.random() * (markX * 400) + (markX * this.cWidth),
            y: Math.random() * (markY * 300) + (markY * this.cHeight),
            z: -100 + Math.random() * 50
          }, opt.duration || 1000)
          .easing(easing)
          .delay(opt.delay || 0)
          .onUpdate(() => {
            mesh.position.set(data.x, data.y, data.z)
          })
          .onComplete(() => {
            group.removeAll()
            mesh.visible = false
          })
          .start()
      },
      _startTween (mesh, offsetX, offsetY, rotateXLength, xSize, ySize) {
        let {x, y, z} = mesh.position
        let rotation = mesh.rotation
        let group = mesh.userData.group || new TWEEN.Group()
        // 绑定动画组到对应的对象上
        mesh.userData.group = group
        let data = {
          x, y, z,
          rx: rotation.x,
          ry: rotation.y,
          rz: rotation.z
        }
        // 随机旋转
        let targetRotation = {
          rx: rotation.x,
          ry: rotation.y,
          rz: rotation.z
        }
        targetRotation.rx = 0
        targetRotation.ry = 0
        targetRotation.rz = 0
        if (rotationIndex === 0) {
          targetRotation.ry += rotationDirection * Math.PI / 2
        }
        if (rotationIndex === 1) {
          targetRotation.rx += rotationDirection * Math.PI / 2
        }
        let opt = this.startOption || {}
        let easing = typeof opt.easing === 'function' ? opt.easing() : (opt.easing || TWEEN.Easing.Quadratic.Out)
        new TWEEN.Tween(data, group)
          .to({
            x: offsetX * (rotateXLength + 1),
            y: offsetY * (ySize + 1),
            z: -rotateXLength * 2,
            ...targetRotation
          }, opt.duration || 1000)
          .easing(easing)
          .delay(opt.delay || 0)
          .onUpdate(() => {
            mesh.position.set(data.x, data.y, data.z)
            mesh.rotation.x = data.rx
            mesh.rotation.y = data.ry
            mesh.rotation.z = data.rz
          })
          .onComplete(() => {
            group.removeAll()
            // 结束动画
            this._endTween(mesh, offsetX, offsetY, xSize, ySize)
          })
          .start()
      },
      _endTween (mesh, offsetX, offsetY, xSize, ySize) {
        let {x, y, z} = mesh.position
        let group = mesh.userData.group2 || new TWEEN.Group()
        mesh.userData.group2 = group
        let data = {
          x, y, z
        }
        let opt = this.endOption || {}
        let easing = typeof opt.easing === 'function' ? opt.easing() : (opt.easing || TWEEN.Easing.Quadratic.InOut)
        new TWEEN.Tween(data, group)
          .to({
            x: offsetX * (xSize + this.cubeSpace),
            y: offsetY * (ySize + this.cubeSpace),
            z: 0
          }, opt.duration || 1000)
          .easing(easing)
          .delay(opt.delay || 0)
          .onUpdate(() => {
            mesh.position.set(data.x, data.y, data.z)
          })
          .onComplete(() => {
            group.removeAll()
            this.isAnimating = false
            cubeAniComplete--
            if (cubeAniComplete > 0 ) return false
            this.play()
          })
          .start()
      },
      _changeTween (mesh, offsetX, offsetY, rotateXLength, xSize, ySize) {
        // 这里主要是在进行下一次图片切入前,先打乱位置,进行平滑的过渡
        let {x, y, z} = mesh.position
        let rotaion = mesh.rotation
        let data = {
          x, y, z,
          rx: rotaion.x,
          ry: rotaion.y,
          rz: rotaion.z,
          time: 0
        }
        let group = mesh.userData.group3 || new TWEEN.Group()
        mesh.userData.group3 = group
        let {i, j} = mesh.userData
        let moveData = this._getChangeTweenMoveData({i, j})
        let opt = this.changeOption || {}
        let easing = typeof opt.easing === 'function' ? opt.easing() : (opt.easing || TWEEN.Easing.Quadratic.Out)
        let duration = (opt.duration || 1000)
        let delay = (opt.delay || 0) + (moveData.delay || 0)
        this.offsetDelay = Math.max(moveData.delay || 0, this.offsetDelay)
        // 起始
        let source = {...data}
        let target = {
          x: x + moveData.x,
          y: y + moveData.y,
          z: z + moveData.z,
          rx: source.rx + (moveData.rx || 0),
          ry: source.ry + (moveData.ry || 0),
          rz: source.rz + (moveData.rz || 0),
          time: duration
        }
        new TWEEN.Tween(data, group)
          .to(target, duration)
          .easing(easing)
          .delay(delay)
          .onUpdate(() => {
            let res = moveData.count
              ? moveData.count({...source, time: data.time}, {...target})
              : {...data}
            mesh.position.set(res.x, res.y, res.z)
            mesh.rotation.set(res.rx || data.rx, res.ry || data.ry, res.rz || data.rz)
          })
          .onComplete(() => {
            group.removeAll()
            // 还原镜头
            restoreCamera()
            // 这里开始进行下一次图片切入并还原所有立方体的位置
            this._startTween(mesh, offsetX, offsetY, rotateXLength, xSize, ySize )
          })
          .start()
      },
      _initImage () {
        let item = this.items[this.currentIndex] || null
        if (!item) return false
        // 获取对应条目的离屏canvas
        let canvas = drawImages[this.currentIndex]
        let context = canvas.getContext('2d')
        this.imageCanvas = canvas
        let { width, height } = canvas
        // 确定过渡类型
        changeIndex = Math.random() * changeArr.length - 0.1 >> 0
        // 确定旋转类型
        rotationIndex = Math.random() * 2 - 0.1 >> 0
        // 确定旋转方向
        rotationDirection = (Math.random() * 10 >> 0) % 2 === 0 ? -1 : 1
        // console.log(rotationDirection, rotationIndex)
        // 为了保证过渡效果,在发生小方块数量变化的时候一律采用随机动画
        if (item.size) {
          if (this.size[0] !== item.size[0] || this.size[1] !== item.size[1]) changeIndex = 0
        }
        else {
          if (this.size[0] !== this.defaultSize[0] || this.size[1] !== this.defaultSize[1])
            changeIndex = 0
        }

        // 获取横纵比
        this.size = item.size || this.defaultSize
        // 设定在webGL中的图片范围
        this.iHeight = this.cHeight // 与容器等高
        this.iWidth = this.iHeight / height * width // 宽度进行缩放
        // 进行图片切换的动画
        this._switchImage({canvas, context, width, height, item})
        // 生成方块
        this._initCube()
        // 方块变化动画
        this._initPosition()
      },
      _switchImage ({canvas, context, width, height, item}) {
        context.clearRect(0, 0, width, height)
        // 当没有前一张图片的时候,不用编写图片切换的过渡效果
        if (!prevImage) {
          context.save()
          // 重新绘制当前canvas保存的图像
          context.drawImage(canvas._imgElement, 0, 0)
          context.restore()
          if (material) {
            material.map.needsUpdate = true
          }
          prevImage = canvas._imgElement
          return false
        }
        // 否则进行图片切换的过渡操作
        let defaultOption = {
          // 动画方式
          name: 'translate',
          // 运动类型 (L: 左 T: 顶 R: 右 B: 底 C: 中 X: 水平 Y: 纵向 A: 所有方向 2: To)
          type: 'LT2RB',
          // 持续时间
          duration: 3000,
          // 延迟
          delay: 0,
          // 动画曲线(记得要用TWEEN内置的曲线,否则不识别)
          easing: TWEEN.Easing.Quadratic.InOut
        }
        this._animateImage({
          ...(Object.assign({}, defaultOption, (item.animate || {})))
        }, context, canvas)
      },
      _animateImage (data = {}, context, canvas) {
        if (!context || !canvas || drawImages.length === 0) return false
        let maxDuaration = this.animateDuration
        // 定义一组动画
        let animation = {}
        // 定义动画方式
        const tweenAnimate = (start, target, update = function () {}) => {
          let source = {...start}
          let delay = Math.min((data.delay || 0), maxDuaration - 1000)
          let duration = Math.min(data.duration, maxDuaration - delay)
          new TWEEN.Tween(source)
            .to({
              ...target
            }, duration)
            .easing(data.easing)
            .delay(delay)
            .onStart(() => {
              // 更新纹理
              texture = new THREE.CanvasTexture(canvas)
              // 释放前材质的纹理
              material.map.dispose()
              // 重新绑定纹理到材质
              material.map = texture
            })
            .onUpdate(() => {
              let x = source.offsetX / 100
              let y = source.offsetY / 100
              if (drawImages.length === 0 || !prevImage) return false
              update(x, y)
              if (material) {
                material.map.needsUpdate = true
              }
            })
            .onComplete(() => {
              // 更新上一图片
              prevImage = canvas._imgElement
            })
            .start()
        }
        // 平移
        animation.translate = (type) => {
          // 前图片的尺寸
          let piWidth = prevImage.naturalWidth
          let piHeight = prevImage.naturalHeight
          // 当前图片的尺寸
          let [width, height] = [canvas.width, canvas.height]
          const translate = {
            // 左上到右下
            LT2RB: () => {
              let source = { offsetX: 0, offsetY: 0 }
              let target = { offsetX: 100, offsetY: 100 }
              tweenAnimate(source, target, (x, y) => {
                context.save()
                // 绘制前图片
                context.drawImage(
                  prevImage, 0, 0, piWidth, piHeight,
                  0, 0, piWidth, piHeight
                )
                // 绘制当前图片
                context.drawImage(
                  canvas._imgElement, (1 - x) * width, (1 - y) * height,
                  width * x, height * y,
                  0, 0, width * x, height * y
                )
                context.restore()
              })
            },
            // 右上到左下
            RT2LB: () => {
              let source = { offsetX: 0, offsetY: 0 }
              let target = { offsetX: 100, offsetY: 100 }
              tweenAnimate(source, target, (x, y) => {
                context.save()
                // 绘制前图片
                context.drawImage(
                  prevImage, 0, 0, piWidth, piHeight,
                  0, 0, piWidth, piHeight
                )
                // 绘制当前图片
                context.drawImage(
                  canvas._imgElement, 0, (1 - y) * height, width * x, height * y,
                  (1 - x) * width, 0, width * x, height * y
                )
                context.restore()
              })
            },
            // 上到下
            T2B: () => {
              let source = { offsetX: 100, offsetY: 0 }
              let target = { offsetX: 100, offsetY: 100 }
              tweenAnimate(source, target, (x, y) => {
                context.save()
                // 绘制前图片
                context.drawImage(
                  prevImage, 0, 0, piWidth, piHeight,
                  0, 0, piWidth, piHeight
                )
                // 绘制当前图片
                context.drawImage(
                  canvas._imgElement, 0, (1 - y) * height, width * x, height * y,
                  0, 0, width * x, height * y
                )
                context.restore()
              })
            },
            // 左到右
            L2R: () => {
              let source = { offsetX: 0, offsetY: 100 }
              let target = { offsetX: 100, offsetY: 100 }
              tweenAnimate(source, target, (x, y) => {
                context.save()
                // 绘制前图片
                context.drawImage(
                  prevImage, 0, 0, piWidth, piHeight,
                  0, 0, piWidth, piHeight
                )
                // 绘制当前图片
                context.drawImage(
                  canvas._imgElement, (1 - x) * width, 0, width * x, height * y,
                  0, 0, width * x, height * y
                )
                context.restore()
              })
            },
            // 右到左
            R2L: () => {
              let source = { offsetX: 0, offsetY: 100 }
              let target = { offsetX: 100, offsetY: 100 }
              tweenAnimate(source, target, (x, y) => {
                context.save()
                // 绘制前图片
                context.drawImage(
                  prevImage, 0, 0, piWidth, piHeight,
                  0, 0, piWidth, piHeight
                )
                // 绘制当前图片
                context.drawImage(
                  canvas._imgElement, 0, 0, width * x, height * y,
                  (1 - x) * width, 0, width * x, height * y
                )
                context.restore()
              })
            },
            // 下到上
            B2T: () => {
              let source = { offsetX: 100, offsetY: 0 }
              let target = { offsetX: 100, offsetY: 100 }
              tweenAnimate(source, target, (x, y) => {
                context.save()
                // 绘制前图片
                context.drawImage(
                  prevImage, 0, 0, piWidth, piHeight,
                  0, 0, piWidth, piHeight
                )
                // 绘制当前图片
                context.drawImage(
                  canvas._imgElement, 0, 0, width * x, height * y,
                  0, (1 - y) * height, width * x, height * y
                )
                context.restore()
              })
            },
            // 右下到左上
            RB2LT: () => {
              let source = { offsetX: 0, offsetY: 0 }
              let target = { offsetX: 100, offsetY: 100 }
              tweenAnimate(source, target, (x, y) => {
                context.save()
                // 绘制前图片
                context.drawImage(
                  prevImage, 0, 0, piWidth, piHeight,
                  0, 0, piWidth, piHeight
                )
                // 绘制当前图片
                context.drawImage(
                  canvas._imgElement, 0, 0, width * x, height * y,
                  (1 - x) * width, (1 - y) * height, width * x, height * y
                )
                context.restore()
              })
            },
            // 左下到右上
            LB2RT: () => {
              let source = { offsetX: 0, offsetY: 0 }
              let target = { offsetX: 100, offsetY: 100 }
              tweenAnimate(source, target, (x, y) => {
                context.save()
                // 绘制前图片
                context.drawImage(
                  prevImage, 0, 0, piWidth, piHeight,
                  0, 0, piWidth, piHeight
                )
                // 绘制当前图片
                context.drawImage(
                  canvas._imgElement, (1 - x) * width, 0, width * x, height * y,
                  0, (1 - y) * height, width * x, height * y
                )
                context.restore()
              })
            },
            // 从中心发散
            C2A: () => {
              let source = { offsetX: 0, offsetY: 0 }
              let target = { offsetX: 100, offsetY: 100 }
              tweenAnimate(source, target, (x, y) => {
                context.save()
                // 绘制前图片
                context.drawImage(
                  prevImage, 0, 0, piWidth, piHeight,
                  0, 0, piWidth, piHeight
                )
                // 绘制当前图片
                let centerX = width / 2
                let centerY = height / 2
                context.drawImage(
                  canvas._imgElement,
                  0, 0,
                  width, height,
                  centerX - x * width / 2,
                  centerY - y * height / 2,
                  width * x, height * y,
                )
                context.restore()
              })
            },
            // 从中心水平发散
            C2X: () => {
              let source = { offsetX: 0, offsetY: 100 }
              let target = { offsetX: 100, offsetY: 100 }
              tweenAnimate(source, target, (x, y) => {
                context.save()
                // 绘制前图片
                context.drawImage(
                  prevImage, 0, 0, piWidth, piHeight,
                  0, 0, piWidth, piHeight
                )
                // 绘制当前图片
                let centerX = width / 2
                context.drawImage(
                  canvas._imgElement, 0, 0,
                  centerX * x, height * y,
                  centerX * (1 - x), 0,
                  centerX * x, height * y
                )
                context.drawImage(
                  canvas._imgElement, width * (1 - x / 2), 0,
                  centerX * x, height * y,
                  centerX, 0,
                  centerX * x, height * y
                )
                context.restore()
              })
            },
            // 从中心纵向发散
            C2Y: () => {
              let source = { offsetX: 100, offsetY: 0 }
              let target = { offsetX: 100, offsetY: 100 }
              tweenAnimate(source, target, (x, y) => {
                context.save()
                // 绘制前图片
                context.drawImage(
                  prevImage, 0, 0, piWidth, piHeight,
                  0, 0, piWidth, piHeight
                )
                // 绘制当前图片
                let centerY = height / 2
                context.drawImage(
                  canvas._imgElement,
                  0, 0,
                  width * x, centerY * y,
                  0, centerY * (1 - y),
                  width * x, centerY * y
                )
                context.drawImage(
                  canvas._imgElement,
                  0, height * (1 - y / 2),
                  width * x, centerY * y,
                  0, centerY,
                  width * x, centerY * y
                )
                context.restore()
              })
            },
            // 向中心发散
            A2C: () => {
              let source = { offsetX: 0, offsetY: 0 }
              let target = { offsetX: 100, offsetY: 100 }
              tweenAnimate(source, target, (x, y) => {
                context.save()
                // 绘制前图片
                context.drawImage(
                  prevImage, 0, 0, piWidth, piHeight,
                  0, 0, piWidth, piHeight
                )
                // 绘制当前图片
                let centerX = width / 2
                let centerY = height / 2
                context.drawImage(
                  canvas._imgElement,
                  (1 - x) * centerX, (1 - y) * centerY, centerX * x, centerY * y,
                  0, 0, centerX * x, centerY * y
                )
                context.drawImage(
                  canvas._imgElement,
                  centerX, (1 - y) * centerY, centerX * x, centerY * y,
                  (1 - x / 2) * width, 0, centerX * x, centerY * y
                )
                context.drawImage(
                  canvas._imgElement,
                  centerX, centerY, centerX * x, centerY * y,
                  (1 - x / 2) * width, (1 - y / 2) * height, centerX * x, centerY * y
                )
                context.drawImage(
                  canvas._imgElement,
                  (1 - x) * centerX, centerY, centerX * x, centerY * y,
                  0, (1 - y / 2) * height, centerX * x, centerY * y
                )
                context.restore()
              })
            },
            // 向中心水平发散
            X2C: () => {
              let source = { offsetX: 0, offsetY: 100 }
              let target = { offsetX: 100, offsetY: 100 }
              tweenAnimate(source, target, (x, y) => {
                context.save()
                // 绘制前图片
                context.drawImage(
                  prevImage, 0, 0, piWidth, piHeight,
                  0, 0, piWidth, piHeight
                )
                // 绘制当前图片
                let centerX = width / 2
                context.drawImage(
                  canvas._imgElement,
                  centerX *  (1 - x), 0, centerX * x, height * y,
                  0, 0, centerX * x, height * y,
                )
                context.drawImage(
                  canvas._imgElement,
                  centerX, 0, centerX * x, height * y,
                  (1 - x / 2) * width, 0, centerX * x, height * y,
                )
                context.restore()
              })
            },
            // 向中心纵向发散
            Y2C: () => {
              let source = { offsetX: 100, offsetY: 0 }
              let target = { offsetX: 100, offsetY: 100 }
              tweenAnimate(source, target, (x, y) => {
                context.save()
                // 绘制前图片
                context.drawImage(
                  prevImage, 0, 0, piWidth, piHeight,
                  0, 0, piWidth, piHeight
                )
                // 绘制当前图片
                let centerY = height / 2
                context.drawImage(
                  canvas._imgElement,
                  0, centerY * (1 - y), width * x, centerY * y,
                  0, 0, width * x, centerY * y,
                )
                context.drawImage(
                  canvas._imgElement,
                  0, centerY, width * x, centerY * y,
                  0, (1 - y / 2) * height, width * x, centerY * y,
                )
                context.restore()
              })
            }
          }
          translate[type]()
        }
        // 覆盖
        animation.cover = (type) => {
          // 前图片的尺寸
          let piWidth = prevImage.naturalWidth
          let piHeight = prevImage.naturalHeight
          // 当前图片的尺寸
          let [width, height] = [canvas.width, canvas.height]
          const cover = {
            // 左上到右下
            LT2RB: () => {
              let source = { offsetX: 0, offsetY: 0 }
              let target = { offsetX: 100, offsetY: 100 }
              tweenAnimate(source, target, (x, y) => {
                context.save()
                // 绘制前图片
                context.drawImage(
                  prevImage, 0, 0, piWidth, piHeight,
                  0, 0, piWidth, piHeight
                )
                // 绘制当前图片
                context.drawImage(
                  canvas._imgElement, 0, 0, width * x, height * y,
                  0, 0, width * x, height * y
                )
                context.restore()
              })
            },
            // 右上到左下
            RT2LB: () => {
              let source = { offsetX: 0, offsetY: 0 }
              let target = { offsetX: 100, offsetY: 100 }
              tweenAnimate(source, target, (x, y) => {
                context.save()
                // 绘制前图片
                context.drawImage(
                  prevImage, 0, 0, piWidth, piHeight,
                  0, 0, piWidth, piHeight
                )
                // 绘制当前图片
                context.drawImage(
                  canvas._imgElement, (1 - x) * width, 0, width * x, height * y,
                  (1 - x) * width, 0, width * x, height * y
                )
                context.restore()
              })
            },
            // 上到下
            T2B: () => {
              let source = { offsetX: 100, offsetY: 0 }
              let target = { offsetX: 100, offsetY: 100 }
              tweenAnimate(source, target, (x, y) => {
                context.save()
                // 绘制前图片
                context.drawImage(
                  prevImage, 0, 0, piWidth, piHeight,
                  0, 0, piWidth, piHeight
                )
                // 绘制当前图片
                context.drawImage(
                  canvas._imgElement, 0, 0, width * x, height * y,
                  0, 0, width * x, height * y
                )
                context.restore()
              })
            },
            // 左到右
            L2R: () => {
              let source = { offsetX: 0, offsetY: 100 }
              let target = { offsetX: 100, offsetY: 100 }
              tweenAnimate(source, target, (x, y) => {
                context.save()
                // 绘制前图片
                context.drawImage(
                  prevImage, 0, 0, piWidth, piHeight,
                  0, 0, piWidth, piHeight
                )
                // 绘制当前图片
                context.drawImage(
                  canvas._imgElement, 0, 0, width * x, height * y,
                  0, 0, width * x, height * y
                )
                context.restore()
              })
            },
            // 右到左
            R2L: () => {
              let source = { offsetX: 0, offsetY: 100 }
              let target = { offsetX: 100, offsetY: 100 }
              tweenAnimate(source, target, (x, y) => {
                context.save()
                // 绘制前图片
                context.drawImage(
                  prevImage, 0, 0, piWidth, piHeight,
                  0, 0, piWidth, piHeight
                )
                // 绘制当前图片
                context.drawImage(
                  canvas._imgElement, (1 - x) * width, 0, width * x, height * y,
                  (1 - x) * width, 0, width * x, height * y
                )
                context.restore()
              })
            },
            // 下到上
            B2T: () => {
              let source = { offsetX: 100, offsetY: 0 }
              let target = { offsetX: 100, offsetY: 100 }
              tweenAnimate(source, target, (x, y) => {
                context.save()
                // 绘制前图片
                context.drawImage(
                  prevImage, 0, 0, piWidth, piHeight,
                  0, 0, piWidth, piHeight
                )
                // 绘制当前图片
                context.drawImage(
                  canvas._imgElement, 0, (1 - y) * height, width * x, height * y,
                  0, (1 - y) * height, width * x, height * y
                )
                context.restore()
              })
            },
            // 右下到左上
            RB2LT: () => {
              let source = { offsetX: 0, offsetY: 0 }
              let target = { offsetX: 100, offsetY: 100 }
              tweenAnimate(source, target, (x, y) => {
                context.save()
                // 绘制前图片
                context.drawImage(
                  prevImage, 0, 0, piWidth, piHeight,
                  0, 0, piWidth, piHeight
                )
                // 绘制当前图片
                context.drawImage(
                  canvas._imgElement, (1 - x) * width, (1 - y) * height, width * x, height * y,
                  (1 - x) * width, (1 - y) * height, width * x, height * y
                )
                context.restore()
              })
            },
            // 左下到右上
            LB2RT: () => {
              let source = { offsetX: 0, offsetY: 0 }
              let target = { offsetX: 100, offsetY: 100 }
              tweenAnimate(source, target, (x, y) => {
                context.save()
                // 绘制前图片
                context.drawImage(
                  prevImage, 0, 0, piWidth, piHeight,
                  0, 0, piWidth, piHeight
                )
                // 绘制当前图片
                context.drawImage(
                  canvas._imgElement, 0, (1 - y) * height, width * x, height * y,
                  0, (1 - y) * height, width * x, height * y
                )
                context.restore()
              })
            },
            // 从中心发散
            C2A: () => {
              let source = { offsetX: 0, offsetY: 0 }
              let target = { offsetX: 100, offsetY: 100 }
              tweenAnimate(source, target, (x, y) => {
                context.save()
                // 绘制前图片
                context.drawImage(
                  prevImage, 0, 0, piWidth, piHeight,
                  0, 0, piWidth, piHeight
                )
                // 绘制当前图片
                let centerX = width / 2
                let centerY = height / 2
                context.drawImage(
                  canvas._imgElement,
                  centerX - x * width / 2,
                  centerY - y * height / 2,
                  width * x, height * y,
                  centerX - x * width / 2,
                  centerY - y * height / 2,
                  width * x, height * y,
                )
                context.restore()
              })
            },
            // 从中心水平发散
            C2X: () => {
              let source = { offsetX: 0, offsetY: 100 }
              let target = { offsetX: 100, offsetY: 100 }
              tweenAnimate(source, target, (x, y) => {
                context.save()
                // 绘制前图片
                context.drawImage(
                  prevImage, 0, 0, piWidth, piHeight,
                  0, 0, piWidth, piHeight
                )
                // 绘制当前图片
                let centerX = width / 2
                context.drawImage(
                  canvas._imgElement,
                  centerX - x * width / 2,
                  0,
                  width * x, height * y,
                  centerX - x * width / 2,
                  0,
                  width * x, height * y,
                )
                context.restore()
              })
            },
            // 从中心纵向发散
            C2Y: () => {
              let source = { offsetX: 100, offsetY: 0 }
              let target = { offsetX: 100, offsetY: 100 }
              tweenAnimate(source, target, (x, y) => {
                context.save()
                // 绘制前图片
                context.drawImage(
                  prevImage, 0, 0, piWidth, piHeight,
                  0, 0, piWidth, piHeight
                )
                // 绘制当前图片
                let centerY = height / 2
                context.drawImage(
                  canvas._imgElement,
                  0, centerY - y * height / 2,
                  width * x, height * y,
                  0, centerY - y * height / 2,
                  width * x, height * y,
                )
                context.restore()
              })
            },
            // 向中心发散
            A2C: () => {
              let source = { offsetX: 0, offsetY: 0 }
              let target = { offsetX: 100, offsetY: 100 }
              tweenAnimate(source, target, (x, y) => {
                context.save()
                // 绘制前图片
                context.drawImage(
                  prevImage, 0, 0, piWidth, piHeight,
                  0, 0, piWidth, piHeight
                )
                // 绘制当前图片
                let centerX = width / 2
                let centerY = height / 2
                context.drawImage(
                  canvas._imgElement,
                  0, 0, centerX * x, centerY * y,
                  0, 0, centerX * x, centerY * y
                )
                context.drawImage(
                  canvas._imgElement,
                  (1 - x / 2) * width, 0, centerX * x, centerY * y,
                  (1 - x / 2) * width, 0, centerX * x, centerY * y
                )
                context.drawImage(
                  canvas._imgElement,
                  0, (1 - y / 2) * height, centerX * x, centerY * y,
                  0, (1 - y / 2) * height, centerX * x, centerY * y
                )
                context.drawImage(
                  canvas._imgElement,
                  (1 - x / 2) * width, (1 - y / 2) * height, centerX * x, centerY * y,
                  (1 - x / 2) * width, (1 - y / 2) * height, centerX * x, centerY * y
                )
                context.restore()
              })
            },
            // 向中心水平发散
            X2C: () => {
              let source = { offsetX: 0, offsetY: 100 }
              let target = { offsetX: 100, offsetY: 100 }
              tweenAnimate(source, target, (x, y) => {
                context.save()
                // 绘制前图片
                context.drawImage(
                  prevImage, 0, 0, piWidth, piHeight,
                  0, 0, piWidth, piHeight
                )
                // 绘制当前图片
                let centerX = width / 2
                context.drawImage(
                  canvas._imgElement,
                  0, 0, centerX * x, height * y,
                  0, 0, centerX * x, height * y,
                )
                context.drawImage(
                  canvas._imgElement,
                  (1 - x / 2) * width, 0, centerX * x, height * y,
                  (1 - x / 2) * width, 0, centerX * x, height * y,
                )
                context.restore()
              })
            },
            // 向中心纵向发散
            Y2C: () => {
              let source = { offsetX: 100, offsetY: 0 }
              let target = { offsetX: 100, offsetY: 100 }
              tweenAnimate(source, target, (x, y) => {
                context.save()
                // 绘制前图片
                context.drawImage(
                  prevImage, 0, 0, piWidth, piHeight,
                  0, 0, piWidth, piHeight
                )
                // 绘制当前图片
                let centerY = height / 2
                context.drawImage(
                  canvas._imgElement,
                  0, 0, width * x, centerY * y,
                  0, 0, width * x, centerY * y,
                )
                context.drawImage(
                  canvas._imgElement,
                  0, (1 - y / 2) * height, width * x, centerY * y,
                  0, (1 - y / 2) * height, width * x, centerY * y,
                )
                context.restore()
              })
            }
          }
          cover[type]()
        }
        // 淡入淡出
        animation.fade = (type) => {
          // 前图片的尺寸
          let piWidth = prevImage.naturalWidth
          let piHeight = prevImage.naturalHeight
          // 当前图片的尺寸
          let [width, height] = [canvas.width, canvas.height]
          let fade = {
            // 淡入
            In: () => {
              let source = { offsetX: 0, offsetY: 100 }
              let target = { offsetX: 100, offsetY: 100 }
              tweenAnimate(source, target, (x, y) => {
                context.clearRect(0, 0, width, height)
                context.save()
                // 绘制前图片
                context.drawImage(
                  prevImage, 0, 0, piWidth, piHeight,
                  0, 0, piWidth, piHeight
                )
                context.restore()
                context.save()
                context.globalAlpha = x
                // 绘制当前图片
                context.drawImage(
                  canvas._imgElement, 0, 0, width, height,
                  0, 0, width, height
                )
                context.restore()
              })
            },
            // 淡出
            Out: () => {
              let source = { offsetX: 0, offsetY: 100 }
              let target = { offsetX: 100, offsetY: 100 }
              tweenAnimate(source, target, (x, y) => {
                context.clearRect(0, 0, width, height)
                context.save()
                // 绘制当前图片
                context.drawImage(
                  canvas._imgElement, 0, 0, width, height,
                  0, 0, width, height
                )
                context.restore()
                context.save()
                context.globalAlpha = 1 - x
                // 绘制前图片
                context.drawImage(
                  prevImage, 0, 0, piWidth, piHeight,
                  0, 0, piWidth, piHeight
                )
                context.restore()
              })
            },
            // 淡入淡出
            InOut: () => {
              let source = { offsetX: 0, offsetY: 100 }
              let target = { offsetX: 100, offsetY: 100 }
              tweenAnimate(source, target, (x, y) => {
                context.clearRect(0, 0, width, height)
                context.save()
                context.globalAlpha = x
                // 绘制当前图片
                context.drawImage(
                  canvas._imgElement, 0, 0, width, height,
                  0, 0, width, height
                )
                context.restore()
                context.save()
                context.globalAlpha = 1 - x
                // 绘制前图片
                context.drawImage(
                  prevImage, 0, 0, piWidth, piHeight,
                  0, 0, piWidth, piHeight
                )
                context.restore()
              })
            },
            // 淡出淡入
            OutIn: () => {
              let source = { offsetX: 0, offsetY: 100 }
              let target = { offsetX: 100, offsetY: 100 }
              tweenAnimate(source, target, (x, y) => {
                context.clearRect(0, 0, width, height)
                context.save()
                context.globalAlpha = 1 - x
                // 绘制前图片
                context.drawImage(
                  prevImage, 0, 0, piWidth, piHeight,
                  0, 0, piWidth, piHeight
                )
                context.restore()
                context.save()
                context.globalAlpha = x
                // 绘制当前图片
                context.drawImage(
                  canvas._imgElement, 0, 0, width, height,
                  0, 0, width, height
                )
                context.restore()
              })
            }
          }
          fade[type]()
        }
        animation[data.name](data.type)
      },
      // 组图片加载
      _loadImages (callback = function () {}) {
        let items = this.items || []
        let len = items.length
        // 统计图片加载动作反馈数
        let num = 0
        if (len === 0) {
          callback()
          return false
        }
        items.forEach((item, index) => {
          this._loadImage(item, index, () => {
            num++
            if (num === len) {
              // 图片全部加载完成
              callback()
            }
          })
        })
      },
      // 图片加载主方法
      _loadImage (item, index, callback = function () {}) {
        if (!item) return false
        // 创建对应条目的离屏canvas
        let canvas = drawImages[index] || document.createElement('canvas')
        drawImages[index] = canvas
        let context = canvas.getContext('2d')
        context.clearRect(0, 0, canvas.width, canvas.height)
        // 图片加载处理
        let img = new Image()
        img.crossOrigin = 'anonymous'
        img.onload = () => {
          let width = img.naturalWidth
          let height = img.naturalHeight
          canvas.width = width
          canvas.height = height
          context.save()
          context.drawImage(img, 0, 0)
          // 将img挂载到对应的canvas下
          canvas._imgElement = img
          context.restore()
          this.cvLoading = false
          callback()
        }
        img.onerror = function () {
          // 加载失败也进行操作完成的反馈
          callback()
        }
        img.src = item.src
      }
    }
  }
</script>

<style scoped>
  .slider-3d{
    position: relative;
    height: auto;
  }

  .slider-3d-box{
    position: relative;
    height: auto;
  }
</style>

最后的话

觉得好用的可以交♂易一波,点个收藏或者赞都行,有代码问题可以留言,随缘回答(嗯哼,单身狗就是这么硬气( ◔ิω◔ิ) )



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