Document

CSS3弧形曲线循环菜单导航

2023-08-24
dfer
425
css3 前端 css javascript CSDN

html 代码 index.html

<!DOCTYPE html>
<html lang="en" >
<head>
<meta charset="UTF-8">
<title>CSS3弧形曲线循环菜单导航DEMO演示</title>

<link rel="stylesheet" href="css/style.css">

</head>
<body>

<div class="container">
  <div class="c-menu">
    <div id="list" class="items-list">
          <div class="item">
            <a href="" 
               data-img="img/1.jpg"
               rel="noopener">
               Sass: Документация на русском языке
            </a>
          </div>
          <div class="item">
            <a href="" 
               data-img="img/2.jpg"
               rel="noopener">
               Color Hex Color Codes
            </a>
          </div>
          <div class="item">
            <a href="" 
               data-img="img/3.jpg"
               rel="noopener">
               WebReference
            </a>
          </div>
          <div class="item">
            <a href=""
               data-img="img/4.jpg"
               rel="noopener">
               W3Schools Online Web Tutorials
            </a>
          </div>
          <div class="item">
            <a href="" 
               data-img="img/5.jpg"
               rel="noopener">
               Современный учебник Javascript
            </a>
          </div>
          <div class="item">
            <a href="" 
               data-img="img/6.jpg"
               rel="noopener">
              Can I use... Support tables for HTML5, CSS3, etc
            </a>
          </div>
          <div class="item">
            <a href="" 
               data-img="img/7.jpg"
               rel="noopener">
               CSS-Tricks
            </a>
          </div>
          <div class="item">
            <a href="" 
               data-img="img/8.jpg"
               rel="noopener">
               CodePen
            </a>
         </div>
          <div class="item">
            <a href=""
               data-img="img/9.jpg"
               rel="noopener">
               Таблица символов Юникода®
            </a>
          </div>
          <div class="item">
            <a ref="" 
               data-img="img/10.jpg"
               rel="noopener">
               Font Awesome
            </a>
          </div>
          <div class="item">
            <a href="" 
               data-img="img/11.jpg"
               rel="noopener">
               Vue.js
            </a>
          </div>
          <div class="item">
            <a href="" 
               data-img="img/12.jpg"
               rel="noopener">
               PHP: Что такое PHP? - Manual
            </a>
          </div>
          <div class="item">
            <a href=""
               data-img="img/13.jpg"
               rel="noopener">
               SQL.ru - все про SQL
            </a>
          </div>
    </div>
    <div class="top"></div>
    <div class="btn prev" onClick="animation({}, 1);">˄</div>
       <div id="pic" class="img-box"></div>
    <div class="btn next" onClick="animation({}, 0);">˅</div>
    <div class="bottom"></div>
  </div>  
</div>

<script  src="js/index.js"></script>
<script>
  setInterval(() => {
    animation({}, 1)
}, 3000);
</script>
<div style="text-align:center;clear:both;margin-top:50px;">
<!-- <script src="/gg_bd_ad_720x90.js" type="text/javascript"></script>
<script src="/follow.js" type="text/javascript"></script> -->

</div>

</body>
</html>

css代码 css/style.css

body {
  background-color: #4682b4;
}

a:hover,
a {
  color: inherit;
  text-decoration: inherit;
}

.c-menu {
  position: relative;
  height: 739px;
  width: 800px;
  overflow: hidden;
  margin-left: 50px;
  margin-top: 150px;
}

.top, .bottom {
  position: absolute;
  left: 0;
  width: 100%;
  height: 50px;
  background: transparent;
}

.top {
  top: 0;
  background: linear-gradient(to bottom, steelblue 0%, rgba(70, 130, 180, 0) 100%);
}

.bottom {
  bottom: 0;
  background: linear-gradient(to bottom, rgba(70, 130, 180, 0) 0%, steelblue 100%);
}

.img-box, .hide {
  position: absolute;
  left: 7px;
  top: 177px;
  width: 111px;
  height: 82px;
  opacity: 1;
  transition: opacity, 2s;
}

.hide {
  opacity: 0;
  transition: opacity, .5s;
}

.items-list {
  position: absolute;
  /* left: -400px; */
  top: 0px;
  width: 368px;
  height: 640px;
  border: 2px solid #a2c0d9;
  border-radius: 50%;
  margin: 70px;
}

.item {
  position: absolute;
  width: 600px;
  padding-left: 25px;
  font-size: 18px;
  transition: font-size 1s;
  text-align: left;
  cursor: pointer;
}
.item:nth-child(7) {
  font-size: 28px;
  margin-top: -4px;
  transition: font-size .5s;
}
.item:before {
  content: "";
  position: absolute;
  width: 10px;
  height: 10px;
  background-color: #dae6ef;
  border-radius: 50%;
  left: 5px;
  top: 4px;
}
.item:nth-child(7):before {
  top: 10px;
}
.item a {
  color: #dae6ef;
  transition: color 0.5s;
}
.item a:hover {
  color: white;
  transition: color 0.5s;
}
.item:nth-child(2), .item:nth-child(3), .item:nth-child(11), .item:nth-child(12) {
  opacity: 0.7;
}

.btn {
  position: absolute;
  width: 20px;
  height: 20px;
  cursor: pointer;
  left: 60px;
  font-size: 20pt;
  color: #dae6ef;
  -webkit-transform: scale(3, 1);
          transform: scale(3, 1);
  -webkit-user-select: none;
     -moz-user-select: none;
      -ms-user-select: none;
          user-select: none;
}
.btn:hover {
  color: white;
  transition: color 0.5s;
}

.prev {
  top: 110px;
}

.next {
  bottom: 120px;
}

js 代码 js/index.js


const srart_pos = 90.75;
const item_count = 13;
const s = 0.52 * Math.PI / 180; //计算偏移角

var pos = [];
var elem = document.getElementsByClassName('item');
 

function allocationItems() {
  var i;
  var pp = elem[6].getElementsByTagName('a')[0].getAttribute('data-img'); 
  // document.getElementById("pic").style.backgroundImage = "url('"+pp+"')"; 
  // document.getElementById("pic").className = "img-box";
  pos[0] = srart_pos;
  for (i = 1; i < item_count; i++) {
    pos[i] = pos[i - 1] - 0.2;
    last_pos=pos[i];
  }
  for (i = 0; i < item_count; i++) {
    // console.log(elem[i])
    elem[i].style.left = 209 + 150 * Math.sin(pos[i]) + 'px';
    elem[i].style.top = 310 + 300 * Math.cos(pos[i]) + 'px';
  }
}  

allocationItems();

function animation(args, flag) { // 我们将为未来确定一些论点
    var $ = {
        radius: 150, // 圆半径
        speed: 10 // 速度/延迟（在JS中是ms，例如10 ms=100 fps）
    };
    var e = elem;
    document.getElementById("pic").className = "hide";    
    function animate(draw, duration, callback) {
        var start = performance.now();
        requestAnimationFrame(function animate(time) {
            // 确定动画开始后多长时间
            var timePassed = time - start;
            // console.log(time, start)
            // 可能有点超时，在这种情况下，锁定结束
            if (timePassed > duration)
                timePassed = duration;
            // 绘制动画的状态在timepassed
            draw(timePassed);
            // 如果动画时间没有结束-计划更多的帧
            if (timePassed < duration) {
                requestAnimationFrame(animate);
            } else callback();
        });
    }
    animate(function (timePassed) {
        var i;
        for (i = 0; i < item_count; i++) {
            e[i].style.left = 209 + $.radius * Math.sin(pos[i]) + 'px';
            e[i].style.top = 310 + 300 * Math.cos(pos[i]) + 'px';
            if (flag) {
                pos[i] += s; 
            } else {
                pos[i] -= s; 
            }
        }   /* callback function */
    }, 400, function changeItems() {
        var list = document.getElementById('list');
        var ch = flag ? list.firstElementChild : list.lastElementChild
        ch.remove();
        if (flag) {
          list.appendChild(ch);
        } else {
          list.insertBefore(ch, list.firstChild);
        }
        allocationItems();
    });
}

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