three-d-banner
/
3d.html

<!DOCTYPE html>
<html>

<head>
  <title>DeviceOrientationEvent</title>
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta charset="UTF-8" />
</head>
<style>
  * {
    padding: 0;
    margin: 0;
  }

  .banner {
    width: 100%;
  }

  .item {
    width: 100%;
    height: 100%;
    position: relative;
  }

  .item_img-box {
    position: absolute;
    left: 0;
    top: 0;
    right: 0;
    bottom: 0;
    overflow: hidden;
  }

  img {
    width: 100%;
    vertical-align: bottom;
  }

  .item>.item_img-box.foreground>img {
    transform: scale(1.4);
    position: absolute;

  }

  .item>.item_img-box.background>img {
    transform: scale(1.8);
    position: absolute;
  }

  .item>.item_img-box.foreground {
    z-index: 100;
  }

  .item>.item_img-box.middle {
    z-index: 10;
  }

  .item>.item_img-box.background {
    z-index: 1;
  }
</style>

<body>

  <div class="banner" id="banner">
    <div class="item">
      <div class="item_img-box foreground"><img src="./img/foreground.png" alt="" id="foreground"></div>
      <div class="item_img-box middle"><img src="./img/middle.png" alt=""></div>
      <div class="item_img-box background"><img src="./img/background.png" alt="" id="background"></div>
    </div>
  </div>

  <!-- <p>左右：<span id="alpha">0</span>
  </p>
  <p>前后：<span id="beta">0</span>
  </p>
  <p>扭转：<span id="gamma">0</span>
  </p>
  <p>指北针指向：<span id="heading">0</span>度</p>
  <p>指北针精度：<span id="accuracy">0</span>度</p>
  <hr />
  <p>x轴加速度：<span id="x">0</span>米每二次方秒</p>
  <p>y轴加速度：<span id="y">0</span>米每二次方秒</p>
  <p>z轴加速度：<span id="z">0</span>米每二次方秒</p>
  <hr />
  <p>x轴加速度(考虑重力加速度)：<span id="xg">0</span>米每二次方秒</p>
  <p>y轴加速度(考虑重力加速度)：<span id="yg">0</span>米每二次方秒</p>
  <p>z轴加速度(考虑重力加速度)：<span id="zg">0</span>米每二次方秒</p>
  <hr />
  <p>左右旋转速度：<span id="Ralpha">0</span>度每秒</p>
  <p>前后旋转速度：<span id="Rbeta">0</span>度每秒</p>
  <p>扭转速度：<span id="Rgamma">0</span>度每秒</p>
  <hr />
  <p>上次收到通知的间隔：<span id="interval">0</span>毫秒</p> -->


  <script type="text/javascript">


    window.onload = function () {
      const img = document.getElementsByTagName('img')[0]
      const banner = document.getElementById('banner')
      banner.style.height = img.height + 'px'
      const __F_SCALE__ = 1.4 // 前景缩放
      const __B_SCALE__ = 1.8 // 背景缩放
      // 水平方向上最大偏移计算方法为：(缩放比例-1) * 宽 / 2
      // 前景层
      const foreground = {
        maxOffsetHorizontal: 0, // 水平最大偏移量
        maxOffsetVertical: 0, // 垂直最大偏移量
      }
      // 背景层
      const background = {
        maxOffsetWidth: 0,
        maxOffsetheight: 0,
      }
      // 计算最大偏移距离
      foreground.maxOffsetHorizontal = img.offsetWidth * (__F_SCALE__ - 1) / 2
      foreground.maxOffsetVertical = img.offsetHeight * (__F_SCALE__ - 1) / 2

      background.maxOffsetHorizontal = img.offsetWidth * (__B_SCALE__ - 1) / 2
      background.maxOffsetVertical = img.offsetHeight * (__B_SCALE__ - 1) / 2

      const speedRatio = background.maxOffsetHorizontal / foreground.maxOffsetHorizontal
      // console.log(speedRatio)

      const maxAngleX = 90
      const maxAngleY = 90


      window.addEventListener("deviceorientation", orientationHandler, false);

      function orientationHandler(event) {
        // document.getElementById("alpha").innerHTML = event.alpha;
        // document.getElementById("beta").innerHTML = event.beta;
        // document.getElementById("gamma").innerHTML = event.gamma;
        // 沿Y轴翻转
        if (Math.abs(event.gamma) <= maxAngleY) {
          document.getElementById('foreground').style.left = (foreground.maxOffsetHorizontal / maxAngleX)*0.8 * event.gamma + 'px'
          document.getElementById('background').style.left = -((foreground.maxOffsetHorizontal / maxAngleY)*0.8 *speedRatio* event.gamma) + 'px'
          // if(event.gamma<=0){

          // }else{

          // }
        }

        if (Math.abs(event.beta) <= maxAngleX) {
          document.getElementById('foreground').style.top = (foreground.maxOffsetVertical / maxAngleX) * event.beta + 'px'
          document.getElementById('background').style.top = -((foreground.maxOffsetVertical / maxAngleY) *speedRatio* event.beta) + 'px'
          // if(event.gamma<=0){

          // }else{

          // }
        }
        // document.getElementById("heading").innerHTML = event.webkitCompassHeading;
        // document.getElementById("accuracy").innerHTML = event.webkitCompassAccuracy;
      }


    }


    function motionHandler(event) {
      // document.getElementById("interval").innerHTML = event.interval;
      // var acc = event.acceleration;
      // document.getElementById("x").innerHTML = acc.x;
      // document.getElementById("y").innerHTML = acc.y;
      // document.getElementById("z").innerHTML = acc.z;
      // var accGravity = event.accelerationIncludingGravity;
      // document.getElementById("xg").innerHTML = accGravity.x;
      // document.getElementById("yg").innerHTML = accGravity.y;
      // document.getElementById("zg").innerHTML = accGravity.z;
      // var rotationRate = event.rotationRate;
      // document.getElementById("Ralpha").innerHTML = rotationRate.alpha;
      // document.getElementById("Rbeta").innerHTML = rotationRate.beta;
      // document.getElementById("Rgamma").innerHTML = rotationRate.gamma;
    }

    if (window.DeviceMotionEvent) {
      window.addEventListener("devicemotion", motionHandler, false);
    } else {
      document.body.innerHTML = "What user agent u r using???";
    }

    // if (window.DeviceOrientationEvent) {
    //   window.addEventListener("deviceorientation", orientationHandler, false);
    // } else {
    //   document.body.innerHTML = "What user agent u r using???";
    // };
  </script>
</body>

</html