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index.html
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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width,initial-scale=1.0,maximum-scale=1.0,minimum-scale=1.0" />
<!--<meta name="apple-touch-fullscreen" content="yes" />-->
<meta name="apple-mobile-web-app-capable" content="yes" />
<meta name="apple-mobile-web-app-status-bar-style" content="black" />
<meta name="format-detection" content="telephone=no" />
<title>基于重力加速度感应器的小球</title>
<style>
.output{
position: absolute;;
top:0;
left:0;
color:#FFF;
}
.menu{
position: absolute;
top:24px;
left:10px;
height:30px;
padding:2px 5px;
border:1px solid #3A3A3A;
border-radius:20px;
-webkit-border-radius:20px;
background: -webkit-linear-gradient(top,#4A4A4A 0%,#3F4550 100%);
opacity:0.82;
}
.menu ul{
-webkit-padding-start:0;
-webkit-margin-before:0;
height: 30px;
padding-right: 5px;
padding-left: 10px;
display: inline-block;
}
.menu ul li{
display: inline-block;
line-height: 30px;
}
.menu ul li:after{
content:' |';
color:#FFF;
}
.menu ul li:last-child:after{
content:'';
}
.menu a{
color:#FFF;
text-decoration: none;
line-height: 30px;
}
.menu .btn-ball{
display: inline-block;
height:30px;
width:30px;
box-shadow:0px 1px 1px #000;
-webkit-border-radius:15px;
background: -webkit-linear-gradient(top,#FFBC24 0%,#FF7800 100%);
opacity:1;
}
.menu .arrow{
display: inline-block;;
width: 10px;
height:10px;
text-align: center;
border-bottom: 2px solid #FFF;
border-right:2px solid #FFF;
-webkit-transform:rotate(-45deg);
margin-left: 6px;
margin-top:9px;
}
body{
margin:0;
}
</style>
</head>
<body>
<div class="menu">
<ul>
<li><a href="#">滚球</a></li>
<!--<li><a href="#">简介</a></li>
<li><a href="#">返回</a></li>-->
</ul>
<div class="btn-ball"><span class="arrow"></span></div>
</div>
<div id="loading" class="loading"></div>
<canvas id="ball">对不起，你当前的浏览器不支持Canvas标签。</canvas>
<script type="text/javascript">
var cur_x = 0,cur_y = 0;
var ball_radius = 50;
var initialized = false;
var ww,wh;
var speed_x = 0,speed_y = 0;
var accel_x,accel_y;
var friction_accel = 0.02;
var interval = 33; //ms, 30 fps
var bg_color = "#EEEEEE";
var fg_color = "#333";
var absorbing_rate = 0.5;
var opera_pix_bg=new Image();
opera_pix_bg.src="img/bg.jpg";
//小球图片源文件名
var ballImages = ['img/ball-1.png','img/ball-2.png','img/ball-3.png','img/ball-4.png','img/ball-5.png','img/ball-6.png'],
//存放小球图片对象
ballImagesObj = [],
//小球图片总数
ballImagesLen = ballImages.length,
//加载图片统计
loadingCount = 0,
//加载循环变量
loadTimeout,
//isChangeImage = false,
ballIndex = 0;
function $(id){
return document.getElementById(id);
}
//初始化图片对象
function setImages(){
for(var i=0;i<ballImagesLen;i++){
var tmp = new Image();
tmp.src = ballImages[i];
tmp.onload = function(){
loadingCount++;
}
ballImagesObj.push(tmp);
}
}
//增加loading提示加载图片
function loadImages(){
if(loadingCount == ballImagesLen){
window.clearTimeout(loadTimeout);
init();
return;
}
loadTimeout = window.setTimeout('loadImages()',100);
}
//随机生成小球索引
function randomBallIndex(){
var tempIndex = Math.round(Math.random()*(ballImagesLen - 1));
if(ballIndex == tempIndex){
randomBallIndex();
}else{
ballIndex = tempIndex;
}
}
//判断方向
function inSameDirection(a, b){
return a > 0 && b > 0 || a <= 0 && b <= 0;
}
//返回位置坐标和速度
function getCurpos(cur_pos, speed, accel, boundary){
if (speed == 0 && Math.abs(accel) <= friction_accel)
return [cur_pos, speed];
start_speed = speed;
f_accel = (speed > 0 ? -friction_accel:friction_accel);
speed += accel + f_accel;
if (!inSameDirection(f_accel, accel) &&
!inSameDirection(f_accel, start_speed) &&
!inSameDirection(start_speed, speed))
{
speed = 0;
}
cur_pos += (start_speed + speed)/2;
if (cur_pos > boundary - ball_radius)
{
cur_pos= boundary - ball_radius;
speed = -speed * absorbing_rate;
randomBallIndex();
}
else if (cur_pos < 0)
{
cur_pos = 0;
speed = -speed * absorbing_rate;
randomBallIndex();
}
return [cur_pos, speed];
}
//实时设置当前坐标值
function physics(){
var x = getCurpos(cur_x, speed_x, accel_x, ww);
cur_x = x[0];
speed_x = x[1];
var y = getCurpos(cur_y, speed_y, accel_y, wh);
cur_y = y[0];
speed_y = y[1];
}
//画图
function paint(){
var ball_canvas = document.getElementById('ball');
var ctx = ball_canvas.getContext('2d');
ctx.save();
physics();
ctx.drawImage(opera_pix_bg, 0,0, ww, wh );
ctx.drawImage(ballImagesObj[ballIndex], cur_x,cur_y, 50, 50 );
ctx.restore();
setTimeout("paint()", interval);
}
//清除canvas画布
function clearCanvas(){
var ball_canvas = document.getElementById('ball');
var ctx = ball_canvas.getContext('2d');
ctx.fillRect(0,0, ww, wh);
}
//更新canvas为全屏状态，并开始实时跟踪小球位置
function update(evt){
accel_x = Math.sin(evt.gamma / 180 * Math.PI);
accel_y = Math.sin(evt.beta / 180 * Math.PI);
if (!initialized)
{
cur_x = ww /2 + ball_radius;
cur_y = wh /2 + ball_radius;
initialized = true;
//clearCanvas();
paint();
}
}
//预加载
function preload(){
var ball_canvas = document.getElementById('ball');
if (ball_canvas.width != window.outerWidth ||
ball_canvas.height != window.outerHeight)
{
ball_canvas.width = window.outerWidth;
ball_canvas.height = window.outerHeight;
}
ww = ball_canvas.width;
wh = ball_canvas.height;
paint();
}
//初始化所有
function init(){
preload();
window.addEventListener('deviceorientation', update, true);
}
(function(){
setImages();
loadImages();
})();
</script>
</body>
</html>