基于HTML5陀螺仪实现移动动画效果

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我是靠谱客的博主朴实鼠标，这篇文章主要介绍基于HTML5陀螺仪实现移动动画效果，现在分享给大家，希望可以做个参考。

这次给大家带来基于HTML5陀螺仪实现移动动画效果，基于HTML5陀螺仪实现移动动画效果的注意事项有哪些，下面就是实战案例，一起来看一下。

最近用ofo小黄车App的时候，发现以前下方扫一扫变成了一个眼睛动的小黄人，觉得蛮有意思的，这里用HTML5仿一下效果。

ofo眼睛效果

效果分析

从效果中不难看出，是使用陀螺仪事件实现的。

这里先来看一下HTML5中陀螺仪事件的一些概念。

陀螺仪事件为deviceorientation，这里主要获取事件中的alpha,beta,gamma。

aplha

行动装置水平放置时，绕 Z 轴旋转的角度，数值为 0 度到 360 度。

beta

行动装置水平放置时，绕 X 轴旋转的角度，数值为 -180 度到 180 度。

gamma

行动装置水平放置时，绕 Z 轴旋转的角度，数值为 -90 度到 90 度。

这里，只需要用到beta和gamma。

将apk解压，得到眼睛素材：

代码实现

复制代码<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no">
  <title>Document</title>
  <style>
    #box{
      position: relative;
      width: 300px;
      margin: 0 auto;
    }
    #face{
      background-image: url(images/face.png);
      background-size: cover;
      width: 300px;
      height: 300px;
      position: absolute;
    }
    #eyeLeft{
      background-image: url(images/eye.png);
      background-size: cover;
      width: 40px;
      height: 40px;
      position: absolute;
      top: 90px;
      left: 100px;
    }
    #eyeRight{
      background-image: url(images/eye.png);
      background-size: cover;
      width: 40px;
      height: 40px;
      position: absolute;
      top: 90px;
      left: 190px;
    }
    #glass{
      background-image: url(images/glass.png);
      background-size: cover;
      width: 300px;
      height: 300px;
      position: absolute;
    }
  </style>
</head>
<body>
  <p id="box">
    <p id="face"></p>
    <p id="eyeLeft"></p>
    <p id="eyeRight"></p>
    <p id="glass"></p>
    <p id="log"></p>
  </p>
<script>
'use strict';
/*
* author: 王乐平
* date:2017.7.17
*/
var eyeLeftPosition = {
  start: [70, 78],
  end: [100, 110]
};
var eyeRightPosition = {
  start: [150, 78],
  end: [190, 110]
};
var eyeLeftCenterPosition = {
  x: (eyeLeftPosition.end[0] - eyeLeftPosition.start[0]) / 2 + eyeLeftPosition.start[0],
  y: (eyeLeftPosition.end[1] - eyeLeftPosition.start[1]) / 2 + eyeLeftPosition.start[1]
};
var eyeRightCenterPosition = {
  x: (eyeRightPosition.end[0] - eyeRightPosition.start[0]) / 2 + eyeRightPosition.start[0],
  y: (eyeRightPosition.end[1] - eyeRightPosition.start[1]) / 2 + eyeRightPosition.start[1]
};
var r = 20;
var eyeLeft = document.querySelector('#eyeLeft');
var eyeRight = document.querySelector('#eyeRight');
if (window.DeviceOrientationEvent) {
  window.addEventListener('deviceorientation', function (event) {
    let {alpha, beta, gamma} = event;
    eyeLeft.style.left = eyeLeftCenterPosition.x + gamma / 90 * r + 'px';
    eyeRight.style.left = eyeRightCenterPosition.x + gamma / 90 * r + 'px';
    eyeLeft.style.top = eyeRight.style.top 
                      = eyeLeftCenterPosition.y + beta / 180 * r + 'px';
    eyeRight.style.transform = eyeLeft.style.transform 
                         = eyeRight.style.WebkitTransform 
                         = eyeLeft.style.WebkitTransform 
                         = 'rotate(' + beta + 'deg)';
  }, false);
} else {
  document.querySelector('body').innerHTML = '浏览器不支持DeviceOrientationEvent';
}
</script>
</body>
</html>1
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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no">
  <title>Document</title>
  <style>
    #box{
      position: relative;
      width: 300px;
      margin: 0 auto;
    }
    #face{
      background-image: url(images/face.png);
      background-size: cover;
      width: 300px;
      height: 300px;
      position: absolute;
    }
    #eyeLeft{
      background-image: url(images/eye.png);
      background-size: cover;
      width: 40px;
      height: 40px;
      position: absolute;
      top: 90px;
      left: 100px;
    }
    #eyeRight{
      background-image: url(images/eye.png);
      background-size: cover;
      width: 40px;
      height: 40px;
      position: absolute;
      top: 90px;
      left: 190px;
    }
    #glass{
      background-image: url(images/glass.png);
      background-size: cover;
      width: 300px;
      height: 300px;
      position: absolute;
    }
  </style>
</head>
<body>
  <p id="box">
    <p id="face"></p>
    <p id="eyeLeft"></p>
    <p id="eyeRight"></p>
    <p id="glass"></p>
    <p id="log"></p>
  </p>
<script>
'use strict';
/*
* author: 王乐平
* date:2017.7.17
*/
var eyeLeftPosition = {
  start: [70, 78],
  end: [100, 110]
};
var eyeRightPosition = {
  start: [150, 78],
  end: [190, 110]
};
var eyeLeftCenterPosition = {
  x: (eyeLeftPosition.end[0] - eyeLeftPosition.start[0]) / 2 + eyeLeftPosition.start[0],
  y: (eyeLeftPosition.end[1] - eyeLeftPosition.start[1]) / 2 + eyeLeftPosition.start[1]
};
var eyeRightCenterPosition = {
  x: (eyeRightPosition.end[0] - eyeRightPosition.start[0]) / 2 + eyeRightPosition.start[0],
  y: (eyeRightPosition.end[1] - eyeRightPosition.start[1]) / 2 + eyeRightPosition.start[1]
};
var r = 20;
var eyeLeft = document.querySelector('#eyeLeft');
var eyeRight = document.querySelector('#eyeRight');
if (window.DeviceOrientationEvent) {
  window.addEventListener('deviceorientation', function (event) {
    let {alpha, beta, gamma} = event;
    eyeLeft.style.left = eyeLeftCenterPosition.x + gamma / 90 * r + 'px';
    eyeRight.style.left = eyeRightCenterPosition.x + gamma / 90 * r + 'px';
    eyeLeft.style.top = eyeRight.style.top 
                      = eyeLeftCenterPosition.y + beta / 180 * r + 'px';
    eyeRight.style.transform = eyeLeft.style.transform 
                         = eyeRight.style.WebkitTransform 
                         = eyeLeft.style.WebkitTransform 
                         = 'rotate(' + beta + 'deg)';
  }, false);
} else {
  document.querySelector('body').innerHTML = '浏览器不支持DeviceOrientationEvent';
}
</script>
</body>
</html>
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