js实现斐波那契序列动画效果代码-html代码-BFW代码库

代码语言：html

所属分类：动画

代码描述：js实现斐波那契序列动画效果代码

下面为部分代码预览，完整代码请点击下载或在bfwstudio webide中打开


<!DOCTYPE html>
<html lang="en" >

<head>

  <meta charset="UTF-8">

  
  
  
<style>
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  width: 100%;
  height: 100em;
  background: #000;
}

.spinners {
  display: grid;
  grid-template-columns: 30% 30% 30%;
  grid-template-rows: 100vh;
  row-gap: 3%;
  justify-items: center;
  align-items: center;
  justify-content: center;
}

@media only screen and (max-width: 1000px) {
  .spinners {
    grid-template-columns: 100%;
    grid-template-rows: 20em 20em 20em;
  }
}

.spinner {
  width: 100%;
  height: 100%;
  transform: translate(-50%, -50%); 
/*   transform-origin: 27.2% 70.5%; */
  transform-origin: 23% 65%;
  animation: spiral-rotate 6s linear infinite;
}

@keyframes spiral-rotate {
  0% {transform: rotate(0deg);}
  100% {transform: rotate(-360deg);}
}

.spiral {
  margin: 0px auto;
  position: absolute;
  top: 0%;
  left: 0%;
  transform-origin: 27.2% 70.5%;
}

.top-layer {
  position: absolute;
  top: 0;
  left: 0;
}

.full-size {
  width: 100%;
  height: 100%;
}

.hurricane8 {
  border-radius: 0% 100% 42% 58% / 63% 63% 37% 37% ;
  background: #383f5a1f; 
  width: 80%;
  height: 80%;
}

.hurricane7 {
  border-radius: 100% 0% 0% 100% / 100% 100% 0% 0%;
  background: #383f5a1f;
}

.hurricane6 {
  border-radius: 0% 100% 0% 100% / 0% 0% 100% 100%;
  background: #383f5a1f;
}

.hurricane5 {
  border-radius: 0% 100% 100% 0% / 0% 0% 100% 100%;
  background: #383f5a1f;
}

.hurricane4, .hurricane3, .hurricane2, .hurricane1, .hurricane0 {
  background: #383f5a1f;
}


.fog1 {
  left: -50%;
  border-radius: 50%;
  background: rgba(0,0,0,0.65);
  box-shadow: 0px 0px 20px 20px rgba(0,0,0,0.55);
  z-index: 6;
}

.fog2 {
  width: 130%;
  height: 130%;
  left: -50%;
  border-radius: 50%;
  background: rgba(255,255,255,0.45);
  box-shadow: 0px 0px 30px 20px rgba(255,255,255,0.55);
  z-index: 5;
}

.circle {
  border-radius: 53% 47% 100% 0% / 0% 0% 100% 100% ;
  width: 16%;
  height: 16%;
  background: #F5F5F501;
  position: absolute;
  bottom: -5.5%;
  right: 0;
}
 
.polygon3 {
  clip-path: polygon(0 80%, 6% 54%, 9% 35%, 8% 19%, 0 0, 34% 0, 57% 36%, 37% 59%);
  width: 30%;
  height: 60%;
  background: #F5F5F502;
  background: 
    linear-gradient(
      to bottom, 
      #F5F5F525, 
      transparent);
  position: absolute;
  bottom: -60%;
  right: -20%;
}
</style>



</head>

<body  >
  <div class="spinners">
  <div id="wrap" class="spinner">
  </div>

  <div id="wrap2" class="spinner">
  </div>

  <div id="wrap3" class="spinner">
  </div>  
</div>

  
      <script >
const N = 9;

function calcFibArray(n) {
  if (n === 0) return [0];
  if (n === 1) return [1];
  let arr = [1, 1];
  for (let i = 2; i < n; i++) {
    arr.push(arr[i-1] + arr[i-2]);
  }
  return arr;
}

function calcSpiralSize(fibArr) {
  let n = fibArr.length;
  if (n === 0) 
    return {width: 0, height: 0};
  else if (n === 1) 
    return {width: 1, height: 1};
  else if (n % 2 ===  0) 
    return {width: fibArr[n-1], height: fibArr[n-1] + fibArr[n-2]};
  else
    return {width: fibArr[n-1] + fibArr[n-2], height: fibArr[n-1]};
}

function calcPositions(fibArr) {
  let posArr = [];
  let cx = fibArr.reduce((accumulator, currentValue, i) => { 
    if (i % 4 === 2) {
      return accumulator + currentValue;
    }
    return accumulator;
    
  }, 0);
  let cy = fibArr.reduce((accumulator, currentValue, i) => { 
    if (i % 4 === 3)
      return accumulator + currentValue;
    return accumulator;
    
  }, 0);
  for (let i = 0; i < fibArr.length; i++) {
    if (i === 0) {
      posArr.push({x: cx, y: cy});
    } else if (i % 4 === 1) {
      posArr.push({
        x: posArr[i-1].x - fibArr[i] + fibArr[i-1],
        y: posArr[i-1].y + fibArr[i-1]
      });
    } else if (i % 4 === 2) {
      posArr.push({
        x: posArr[i-1].x - fibArr[i],
        y: posArr[i-1].y - fibArr[i] + fibArr[i-1]
      });
    } else if (i % 4 === 3) {
      posArr.push({
        x: posArr[i-1].x,
        y: posArr[i-1].y - fibArr[i]
      });
    } else {
      posArr.push({
        x: posArr[i-1].x + fibArr[i-1],
        y: posArr[i-1].y
      });
    }
    
  }
  return posArr;
}

function setSpiralSizeAttributes(e, size) {
  e.style.fontSize ="20x";
  e.style.width = "10em";
  e.style.height = 10 * (size.height / size.width) +"em";
}

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