javascript - 如何使用 javascript 或 jquery 旋转 li？

Question

抱歉出现语法错误。我无法正确提出问题，所以这就是为什么我使用图像来理解我的问题。我有三个 LI 圆圈，我想创建一个能够

的函数

• Onclick li 将旋转并停止在橙色框上并更改其他两个位置。
• 其他两个li也将类似地工作

注意:

Li 基本上是在 onclick 时显示其 div。请帮助我

这是我的 code

CSS

ul{
    width:100px;
    height:100px;
    border-radius:100%;
    border:2px solid #000000;
    text-align:center;
    padding:5%
    }
ul li{
    list-style:none;
    cursor:pointer;
    margin-bottom:10px;
    width:30%;
    height:30%;
    padding:5%;
    border:1px solid #000;
    text-align:center;
    }
ul li div{
  display:none;
}
.skill-box{
    width:500px;
    height:70px;
    border:2px solid #000;
    left:20%;
    position:absolute;}

HTML

<ul id="circle">
        <li>
            <div class="pie"></div>
            one <div class="skill-box">Skill Box 1</div>
        </li>
        <li>
            two <div class="skill-box">Skill Box 2</div>
        </li>
        <li>
            Three <div class="skill-box">Skill Box 3</div>  
        </li>
    </ul>

这是用于显示 li 框的 JavaScript。

<script>  
    $("li").click(function(){   
        $("li div").not($("div",$(this))).hide();   
        $("div",$(this)).fadeToggle("fast");
         }) 

</script>

Answer 1

基本上，您想要构建的是一个轮盘赌轮。

一些简单的谷歌搜索找到了我这个网站:

http://tech.pro/tutorial/1008/creating-a-roulette-wheel-using-html5-canvas

您需要一个 htlm5 Canvas 元素。如果您需要支持某些旧版本的 IE，这将不起作用。这里有很多热链接代码，所以我会推荐您访问该网站。如果它变得不可用。我确定googling for Javascript roulette wheel会带你去某个地方。

编辑:HTML 代码:

<input type="button" value="spin" style="float:left;" />
<canvas id="canvas" width="500" height="500"></canvas>

生成轮子的javascript:

var colors = ["#B8D430", "#3AB745", "#029990", "#3501CB",
             "#2E2C75", "#673A7E", "#CC0071", "#F80120",
             "#F35B20", "#FB9A00", "#FFCC00", "#FEF200"];
var restaraunts = ["Wendy's", "McDonalds", "Chick-fil-a", "Five Guys",
                   "Gold Star", "La Mexicana", "Chipotle", "Tazza Mia",
                   "Panera", "Just Crepes", "Arby's", "Indian"];

var startAngle = 0;
var arc = Math.PI / 6;
var spinTimeout = null;

var spinArcStart = 10;
var spinTime = 0;
var spinTimeTotal = 0;

var ctx;

function drawRouletteWheel() {
  var canvas = document.getElementById("canvas");
  if (canvas.getContext) {
    var outsideRadius = 200;
    var textRadius = 160;
    var insideRadius = 125;

    ctx = canvas.getContext("2d");
    ctx.clearRect(0,0,500,500);


    ctx.strokeStyle = "black";
    ctx.lineWidth = 2;

    ctx.font = 'bold 12px Helvetica, Arial';

    for(var i = 0; i < 12; i++) {
      var angle = startAngle + i * arc;
      ctx.fillStyle = colors[i];

      ctx.beginPath();
      ctx.arc(250, 250, outsideRadius, angle, angle + arc, false);
      ctx.arc(250, 250, insideRadius, angle + arc, angle, true);
      ctx.stroke();
      ctx.fill();

      ctx.save();
      ctx.shadowOffsetX = -1;
      ctx.shadowOffsetY = -1;
      ctx.shadowBlur    = 0;
      ctx.shadowColor   = "rgb(220,220,220)";
      ctx.fillStyle = "black";
      ctx.translate(250 + Math.cos(angle + arc / 2) * textRadius, 
                    250 + Math.sin(angle + arc / 2) * textRadius);
      ctx.rotate(angle + arc / 2 + Math.PI / 2);
      var text = restaraunts[i];
      ctx.fillText(text, -ctx.measureText(text).width / 2, 0);
      ctx.restore();
    } 

    //Arrow
    ctx.fillStyle = "black";
    ctx.beginPath();
    ctx.moveTo(250 - 4, 250 - (outsideRadius + 5));
    ctx.lineTo(250 + 4, 250 - (outsideRadius + 5));
    ctx.lineTo(250 + 4, 250 - (outsideRadius - 5));
    ctx.lineTo(250 + 9, 250 - (outsideRadius - 5));
    ctx.lineTo(250 + 0, 250 - (outsideRadius - 13));
    ctx.lineTo(250 - 9, 250 - (outsideRadius - 5));
    ctx.lineTo(250 - 4, 250 - (outsideRadius - 5));
    ctx.lineTo(250 - 4, 250 - (outsideRadius + 5));
    ctx.fill();
  }
}

function spin() {
  spinAngleStart = Math.random() * 10 + 10;
  spinTime = 0;
  spinTimeTotal = Math.random() * 3 + 4 * 1000;
  rotateWheel();
}

function rotateWheel() {
  spinTime += 30;
  if(spinTime >= spinTimeTotal) {
    stopRotateWheel();
    return;
  }
  var spinAngle = spinAngleStart - easeOut(spinTime, 0, spinAngleStart, spinTimeTotal);
  startAngle += (spinAngle * Math.PI / 180);
  drawRouletteWheel();
  spinTimeout = setTimeout('rotateWheel()', 30);
}

function stopRotateWheel() {
  clearTimeout(spinTimeout);
  var degrees = startAngle * 180 / Math.PI + 90;
  var arcd = arc * 180 / Math.PI;
  var index = Math.floor((360 - degrees % 360) / arcd);
  ctx.save();
  ctx.font = 'bold 30px Helvetica, Arial';
  var text = restaraunts[index]
  ctx.fillText(text, 250 - ctx.measureText(text).width / 2, 250 + 10);
  ctx.restore();
}

function easeOut(t, b, c, d) {
  var ts = (t/=d)*t;
  var tc = ts*t;
  return b+c*(tc + -3*ts + 3*t);
}

drawRouletteWheel();