基於Vue3實現的圖片散落效果範例

2022-04-17 19:00:09

背景

今天又是美好的摸魚一天，剛剛進入職場，覺得一切都很新鮮，導師給的任務也不多（要是每天都是這樣就好了），於是開始帶薪學習。

做啥好呢

沒事在網上亂逛的時候，偶然間看到一個動畫效果不錯，就決定上手做一些，簡單的說就是一個完整的圖片，在一段時間之後回突然破裂開來，覺得很有意思，就新建了一個資料夾。

出現問題

一下午的摸魚時光，間公司熙熙攘攘，我在其中卻格格不入（太閒了），不知多少人投來質疑的眼光（這傢伙不工作嗎），但我只沉浸在我的程式碼裡。終於勉強完成了一個不怎麼醜的版本。

原理

圖片破裂效果說白了就是搞了100個div，每個div都有自己的背景圖片，通過backgroundPosition屬性來控制每個div的背景圖片方位，最後拼在一起，就像一張完整的圖片一樣，給每個div都加上動畫效果，每個div的旋轉角度不同，移動距離不同，移動方位不同來讓整個圖片像玻璃一樣散開來。

HTML結構

這裡用到了兩個div，#break是用作為100個div的容器，#InBox是用來繫結下一張的背景圖片

<div id="animateBox" v-show="showImg">
        <div id="break"></div>
        <div id="InBox"></div>
</div>

準備5張圖片

import bgImg5 from '../../assets/img/1/y1.png'
import bgImg4 from '../../assets/img/1/y2.png'
import bgImg3 from '../../assets/img/1/y3.png'
import bgImg2 from '../../assets/img/1/y4.png'
import bgImg6 from '../../assets/img/1/y5.png'
import { ref, onMounted, onUnmounted } from 'vue'
let index = 0
onMounted(() => {
  let imageSrcArr = [bgImg2, bgImg3, bgImg4, bgImg5, bgImg6]
  let imgloadPromiseArr: Array<Promise<HTMLImageElement>> = []
  let imageArr: Array<string> = []
  for (let i = 0; i < imageSrcArr.length; i++) {
    imgloadPromiseArr[i] = new Promise((resolve, reject) => {
      let img = new Image()
      img.src = imageSrcArr[i]
      img.onload = () => {
        resolve(img)
      }
    })
  }
  imgloadPromiseArr.forEach(item => {
    item.then(res => {
      imageArr.push(`url(${(<HTMLImageElement>res).currentSrc})`)
      index = imageArr.length
    })
  })
  })

建立div

通過createElement建立200個div，每個div繫結長寬，給div新增背景圖片，使用backgroundPosition來讓整個div變得像一張圖片，給div繫結動畫效果。

for (let i = 0; i < 100; i++) {
      let div = document.createElement('div')
      let div1 = document.createElement('div')
      div.style.width = '76px'
      div.style.height = '41px' // 這裡為什麼是41px後面會提到
      div1.style.width = '76px'
      div1.style.height = '40px'
      div1.style.overflow = 'hidden'
      div.style.boxSizing = 'border-box'
      div.style.backgroundImage = imageArr[0]
      let positionX = -(i % 10) * 76 + 'px'
      let positionY = -Math.floor(i / 10) * 40 + 'px'
      div.style.backgroundPosition = positionX + ' ' + positionY
      div.style.backgroundSize = '760px 400px'
      let style = document.styleSheets[0]
      style.insertRule(`@keyframes secondrotate${i}
        {
            0%,30%{
                transform:scale(1)
            }
            70%
            {transform: rotateX(${180 + Math.random() * 720}deg) rotateY(${180 + Math.random() * 720}deg)}
            100%
            {transform: rotateX(${180 + Math.random() * 720}deg) rotateY(${180 + Math.random() * 720}deg)}
        }`)
      style.insertRule(`@keyframes secondrotateS${i}
        {
            0%,32%{
                transform:scale(1);opacity:1;
            }70%
            {transform: translateZ(${300 + Math.random() * 1500}px) translate(${(0.5 - Math.random()) * 500}px,${
        (0.5 - Math.random()) * 500
      }px);opacity:0}
            100%
            {transform: translateZ(${300 + Math.random() * 1500}px) translate(${(0.5 - Math.random()) * 500}px,${
        (0.5 - Math.random()) * 500
      }px);opacity:0}

        }`)
      div1.style.animation = `secondrotateS${i} 4.5s ease-out infinite`
      div.style.animation = `secondrotate${i} 4.5s ease-out infinite`
      div.style.transformOrigin = `center center`
      div1.appendChild(div)
      dom.appendChild(div1)
}

切換背景圖片

通過zIndex來讓當前展示的div是哪一個

前面說過，InBox是展示的下一張圖片，在breakBox散落完成之後，讓breakBox的zIndex降低，展示出下一張圖片，隨後帶有100個div的breakBox完成下一張圖片的渲染，zIndex提高，展示出來

 let count = 0
 let repeat = true
 let breakBox: HTMLDivElement = document.querySelector('#break')!
 let InBox: HTMLDivElement = document.querySelector('#InBox')!
  function changeImage(InBox: HTMLDivElement) {
    if (repeat) {
      breakBox.style.zIndex = '-10'
      count++
      count = count === index ? 0 : count
      repeat = false
      setTimeout(() => {
        repeat = true
        breakBox.style.zIndex = '100'
        let currentImageLength = count === index - 1 ? 0 : count + 1
        InBox.style.backgroundImage = imageArr[currentImageLength]
      }, 1000)
    }
  }

每次動畫完成之後會去調上面這個方法，為了能在div碎片破碎完畢，展示下一張圖片，使用定時器將該方法進行延遲處理 4s是因為div碎片在4s後完全消失。（動畫在執行70%的時候，透明度為0）

const timer1 = ref<number>()
const timer2 = ref<number>()
for (let i = 0; i < 100; i++) {
      let div = document.createElement('div')
      let div1 = document.createElement('div')
      div.style.width = '76px'
      div.style.height = '41px'
      div1.style.width = '76px'
      div1.style.height = '40px'
      div1.style.overflow = 'hidden'
      div.style.boxSizing = 'border-box'
      div.style.backgroundImage = imageArr[0]
      let positionX = -(i % 10) * 76 + 'px'
      let positionY = -Math.floor(i / 10) * 40 + 'px'
      div.style.backgroundPosition = positionX + ' ' + positionY
      div.style.backgroundSize = '760px 400px'
      let style = document.styleSheets[0]
      style.insertRule(`@keyframes secondrotate${i}
        {
            0%,30%{
                transform:scale(1)
            }
            70%
            {transform: rotateX(${180 + Math.random() * 720}deg) rotateY(${180 + Math.random() * 720}deg)}
            100%
            {transform: rotateX(${180 + Math.random() * 720}deg) rotateY(${180 + Math.random() * 720}deg)}
        }`)
      style.insertRule(`@keyframes secondrotateS${i}
        {
            0%,32%{
                transform:scale(1);opacity:1;
            }70%
            {transform: translateZ(${300 + Math.random() * 1500}px) translate(${(0.5 - Math.random()) * 500}px,${
        (0.5 - Math.random()) * 500
      }px);opacity:0}
            100%
            {transform: translateZ(${300 + Math.random() * 1500}px) translate(${(0.5 - Math.random()) * 500}px,${
        (0.5 - Math.random()) * 500
      }px);opacity:0}

        }`)
      div1.style.animation = `secondrotateS${i} 4.5s ease-out infinite`
      div.style.animation = `secondrotate${i} 4.5s ease-out infinite`
      div.style.transformOrigin = `center center`
      div.addEventListener('animationstart', () => {
        timer1.value = setTimeout(() => {
          changeImage(InBox)
          div.style.backgroundImage = imageArr[count]
        }, 4000)
      })
      div.addEventListener('animationiteration', () => {
        timer2.value = setTimeout(() => {
          changeImage(InBox)
          div.style.backgroundImage = imageArr[count]
        }, 4000)
      })
      div1.appendChild(div)
      dom.appendChild(div1)
    }

div存在間隙的問題

在100個div展示之後會出現這樣的線，在經過多次嘗試之後，找到了方法，將div的高度變大，div1設定overflow:hidden; 線回消失

程式碼詳情

<template>
  <div>
    <transition name="fadeIn">
      <div id="animateBox" v-show="showImg">
        <div id="break"></div>
        <div id="InBox"></div>
      </div>
    </transition>
  </div>
</template>

<script setup lang="ts">
import bgImg5 from '../../assets/img/1/y1.png'
import bgImg4 from '../../assets/img/1/y2.png'
import bgImg3 from '../../assets/img/1/y3.png'
import bgImg2 from '../../assets/img/1/y4.png'
import bgImg6 from '../../assets/img/1/y5.png'
import { ref, onMounted, onUnmounted } from 'vue'
const timer1 = ref<number>()
const timer2 = ref<number>()
const showImg = ref<boolean>(false)

onMounted(() => {
  let imageSrcArr = [bgImg2, bgImg3, bgImg4, bgImg5, bgImg6]
  let imgloadPromiseArr: Array<Promise<HTMLImageElement>> = []
  let imageArr: Array<string> = []
  for (let i = 0; i < imageSrcArr.length; i++) {
    imgloadPromiseArr[i] = new Promise((resolve, reject) => {
      let img = new Image()
      img.src = imageSrcArr[i]
      img.onload = () => {
        resolve(img)
      }
    })
  }
  imgloadPromiseArr.forEach(item => {
    item.then(res => {
      imageArr.push(`url(${(<HTMLImageElement>res).currentSrc})`)
      index = imageArr.length
    })
  })
  showImg.value = true
  let repeat = true
  function changeImage(InBox: HTMLDivElement) {
    if (repeat) {
      breakBox.style.zIndex = '-10'
      count++
      count = count === index ? 0 : count
      repeat = false
      setTimeout(() => {
        repeat = true
        breakBox.style.zIndex = '100'
        let currentImageLength = count === index - 1 ? 0 : count + 1
        InBox.style.backgroundImage = imageArr[currentImageLength]
      }, 1000)
    }
  }
  let count = 0
  let index = 0
  let breakBox: HTMLDivElement = document.querySelector('#break')!
  let InBox: HTMLDivElement = document.querySelector('#InBox')!
  InBox.style.backgroundImage = imageArr[1]
  const appendDom = (dom: HTMLElement) => {
    for (let i = 0; i < 100; i++) {
      let div = document.createElement('div')
      let div1 = document.createElement('div')
      div.style.width = '76px'
      div.style.height = '41px'
      div1.style.width = '76px'
      div1.style.height = '40px'
      div1.style.overflow = 'hidden'
      div.style.boxSizing = 'border-box'
      div.style.backgroundImage = imageArr[0]
      let positionX = -(i % 10) * 76 + 'px'
      let positionY = -Math.floor(i / 10) * 40 + 'px'
      div.style.backgroundPosition = positionX + ' ' + positionY
      div.style.backgroundSize = '760px 400px'
      let style = document.styleSheets[0]
      style.insertRule(`@keyframes secondrotate${i}
        {
            0%,30%{
                transform:scale(1)
            }
            70%
            {transform: rotateX(${180 + Math.random() * 720}deg) rotateY(${180 + Math.random() * 720}deg)}
            100%
            {transform: rotateX(${180 + Math.random() * 720}deg) rotateY(${180 + Math.random() * 720}deg)}
        }`)
      style.insertRule(`@keyframes secondrotateS${i}
        {
            0%,32%{
                transform:scale(1);opacity:1;
            }70%
            {transform: translateZ(${300 + Math.random() * 1500}px) translate(${(0.5 - Math.random()) * 500}px,${
        (0.5 - Math.random()) * 500
      }px);opacity:0}
            100%
            {transform: translateZ(${300 + Math.random() * 1500}px) translate(${(0.5 - Math.random()) * 500}px,${
        (0.5 - Math.random()) * 500
      }px);opacity:0}

        }`)
      div1.style.animation = `secondrotateS${i} 4.5s ease-out infinite`
      div.style.animation = `secondrotate${i} 4.5s ease-out infinite`
      div.style.transformOrigin = `center center`
      div.addEventListener('animationstart', () => {
        timer1.value = setTimeout(() => {
          changeImage(InBox)
          div.style.backgroundImage = imageArr[count]
        }, 4000)
      })
      div.addEventListener('animationiteration', () => {
        timer2.value = setTimeout(() => {
          changeImage(InBox)
          div.style.backgroundImage = imageArr[count]
        }, 4000)
      })
      div1.appendChild(div)
      dom.appendChild(div1)
    }
  }
  appendDom(breakBox)
})
onUnmounted(() => {
  typeof timer1 === 'number' && clearTimeout(timer1)
  typeof timer2 === 'number' && clearTimeout(timer2)
})
</script>

<style scoped lang="scss">
@import url('../../css/comment/animate.css');
#animateBox {
  width: 100vw;
  height: calc(100vh - 50px);
  //  background-color: rgba(255, 255, 255, 0.6);
  #break {
    position: absolute;
    left: 0;
    top: 0;
    right: 0;
    bottom: 0;
    margin: auto;
    width: 760px;
    height: 400px;
    display: flex;
    perspective: 1000px;
    transform-style: preserve-3d;
    flex-wrap: wrap;
    z-index: 100;
  }
  #InBox {
    position: absolute;
    left: 0;
    top: 0;
    right: 0;
    bottom: 0;
    margin: auto;
    width: 760px;
    height: 400px;
    display: flex;
    perspective: 1000px;
    transform-style: preserve-3d;
    flex-wrap: wrap;
    z-index: 10;
    background-size: 760px 400px;
  }
}
</style>