html 转盘摇奖

来源：互联网发布：mac上safari打不开网页编辑：程序博客网时间：2024/04/30 03:51

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>圆盘抽奖</title>
<style>
*.{margin:0;padding:0;}
#elm1{height:40px;background-color:#a00;}
#elm2{height:50px;background-color:#0a0;}
#wrap{position:relative;height:400px;}
#bg{position:absolute;left:0;top:0;}
#cell{position:absolute;left:0;top:0;}
#control{position:absolute;left:430px;top:30px;}
</style>
</head>
<body>
<div id='elm1'></div>
<div id='wrap'>
<canvas id='bg'></canvas>
<canvas id='cell'></canvas>
<div id='control'>
<div id='start'>start</div>
<div id='end'>end</div>
<div id='show'>show</div>
</div>
</div>
<div id='elm2'></div>
<script type="text/javascript">
var field = [[0,30],[30,60],[60,90],[90,120],[120,150],[150,180],[180,210],[210,240],[240,270],[270,300],[300,330],[330,360]]
    ,fillStyle = ['#a00','#0a0','#00a','aa0','#a16','#0aa','#a5a','f31','#784','#a43','#34a','#786']
,width = 400
,height = 400
,c_x = 200
,c_y =200
,radius = 200
,dom_bg = document.getElementById('bg')
,dom_cell = document.getElementById('cell')
,index =0
,timer = null
,stop = false
,running = false
,speed = 300
,flag = false
,stepall
,stepfast = 7
,stepslow
,stepping =0
,selected
,pos;
function setup(){
drawBg();
}
function drawBg(){
var deg = Math.PI/180;
var tmp_1 = 0;
var tmp_2 = 30;
dom_bg.height = height;
dom_bg.width = width;
var ctx=dom_bg.getContext('2d');
for(var i=0;i<12;i++){
  ctx.beginPath();
  ctx.fillStyle = fillStyle[i];
  ctx.moveTo(c_x,c_y);
  ctx.arc(c_x,c_y,radius,deg*tmp_1,deg*tmp_2,false);
  ctx.fill();
  ctx.fillStyle = '#000';
  ctx.fillText(tmp_1,200+Math.cos(deg*(tmp_1+15))*130,200+Math.sin(deg*(tmp_1+15))*130);
  tmp_1 +=30;
  tmp_2 +=30;
}
}
function drawBgText(){
}
function rotate(){
if(!flag && stepping>7){
  clearTimer();
  speed = 100;
  timer = setInterval(rotate,speed);
}
if(flag && stepping > stepslow && stepping <stepall){
  clearTimer();
  speed = 300;
  timer = setInterval(rotate,speed);
}
if(index ==12){
  index = 0;
}
if(flag && stepping == stepall){
  clearTimer();
  happy();
}
drawCell();
index++;
stepping++;
}
function drawCell(){
var deg = Math.PI/180;
var tmp_1 = field[index][0];
var tmp_2 = field[index][1];
dom_cell.height=height;
dom_cell.width =width;
var ctx=dom_cell.getContext('2d');
ctx.beginPath();
ctx.fillStyle = '#eee';
ctx.moveTo(c_x,c_y);
ctx.arc(c_x,c_y,radius,deg*tmp_1,deg*tmp_2,false);
ctx.fill();
}
function createStop(){
selected = Math.floor(Math.random() * 11);         //从0-11个数字中选   想zb在这控制一下。
var circle = Math.floor(Math.random()*3) + 2;
var c_step = circle *12;
var   actualIndex = stepping%12;
stepall = selected - actualIndex + c_step;
flag = true;
stepslow = stepall - 7;
stepping = 0;
}
function happy(){
document.getElementById("show").innerText = selected + '选上了';
}
function startClick(){
if(running){
  return;
}
running= true;
timer = setInterval(rotate,speed);
}
function endClick(){
if(stop){
  return;
}
stop = true;
clearTimer();
createStop();
timer = setInterval(rotate,speed);
}
function clearTimer(){
clearInterval(timer);
timer = null;
}
setup();
document.getElementById('start').addEventListener('click',startClick,false);
document.getElementById('end').addEventListener('click',endClick,false);
</script>
</body>
</html>

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