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canvas实现十二星座星空图

时间：2021-07-01 10:21:17 帮助过：9人阅读

效果如下：

代码如下：

  1. <!DOCTYPE html>
  2. <html>
  3. <head lang="en">
  4.  <meta charset="UTF-8">
  5.  <title>canvas星座</title>
  6.  <style>
  7.  * {
  8.   margin: 0;
  9.   padding: 0;
  10.   }
  11.  #box{
  12.   margin:10px 0 0 10px;;
  13.  }
  14.  input{
  15.   outline: none;
  16.   font-size:16px;
  17.  }
  18.  p{
  19.   margin-bottom: 10px
  20.  }
  21.  input[type=date]{
  22.   height:36px;
  23.   text-indent:10px;
  24.  }
  25.  input[type=button]{
  26.   background:#3A92FF;
  27.   color:white;
  28.   border: none;
  29.   height:40px;
  30.   padding:0 10px;
  31.   margin-left: -2px;
  32.  }
  33.  #canvas{
  34.   margin-left:10px;
  35.   background-color: #000;
  36.   display: none;
  37.  }
  38.  </style>
  39. </head>
  40. <body>
  41. <div id="box">
  42.  <p>请选择您的出生日期</p>
  43.  <input type="date" id="birth"><input type="button" id="btn" value="展示我的星空图">
  44. </div>
  45. 　<canvas id="canvas" width="550" height="550">你的浏览器不支持canvas</canvas>
  46. <script type="text/javascript">
  47.  var box=document.getElementById('box');
  48.  var birth=document.getElementById('birth');
  49.  var btn=document.getElementById('btn');
  50.  var canvas=document.getElementById("canvas");
  51.  var ctx=canvas.getContext("2d");
  52.  var g1,date,timer;
  53.  ctx.font = "30px Courier New";
  54.  /*星座位置*/
  55.  var star={
  56.  "白羊座":[
  57.   [[0.30,0.78],[0.34,0.66],[0.28,0.48],[0.60,0.26],[0.65,0.20],[0.71,0.23],[0.70,0.32],[0.72,0.36]],
  58.   [ [0,1,2,3,4,5],[3,6,7]]
  59.  ],
  60.  "天秤座":[
  61.   [[0.16,0.67],[0.34,0.60],[0.60,0.27],[0.75,0.23],[0.84,0.47],[0.63,0.74],[0.51,0.78]],
  62.   [[0,1,2,3,4,5,6]]
  63.  ],
  64.  "摩羯座":[
  65.   [[0.78,0.21],[0.78,0.34],[0.75,0.45],[0.75,0.70],[0.69,0.78],[0.31,0.66],[0.22,0.49],[0.30,0.53],[0.53,0.54]],
  66.   [[0,1,2,3,4,5,6,7,8,1]]
  67.  ],
  68.  "水瓶座":[
  69.   [[0.45,0.21],[0.37,0.35],[0.27,0.51],[0.30,0.58],[0.29,0.64],[0.48,0.79],[0.51,0.71],[0.58,0.68],[0.73,0.74],[0.43,0.53],[0.53,0.47]],
  70.   [[0,1,2,3,4,5,6,7,8],[2,9,10]]
  71.  ],
  72.  "双鱼座":[
  73.   [[0.28,0.43],[0.28,0.53],[0.36,0.73],[0.43,0.78],[0.50,0.70],[0.53,0.62],[0.57,0.58],[0.63,0.43],[0.67,0.39],[0.74,0.39],[0.77,0.34],[0.72,0.30],[0.75,0.22],[0.23,0.50],[0.66,0.33]],
  74.   [[0,1,2,3,4,5,6,7,8,9,10,11,12],[0,13,1],[8,14,11]]
  75.  ],
  76.  "金牛座":[
  77.   [[0.29,0.21],[0.39,0.36],[0.50,0.51],[0.50,0.57],[0.61,0.63],[0.77,0.71],[0.79,0.79],[0.22,0.43],[0.39,0.57],[0.60,0.71],[0.67,0.76]],
  78.   [[0,1,2,3,4,5,6],[7,8,3],[4,9,10]]
  79.  ],
  80.  "双子座":[
  81.   [[0.18,0.37],[0.25,0.45],[0.35,0.55],[0.39,0.68],[0.49,0.77],[0.51,0.63],[0.57,0.78],[0.28,0.29],[0.42,0.32],[0.61,0.49],[0.72,0.60],[0.83,0.59],[0.69,0.75],[0.22,0.54],[0.35,0.43],[0.48,0.21]],
  82.  [[0,1,2,3,4],[2,5,6],[7,8,9,10,11],[9,12],[13,1,14,8,15]]
  83.  ],
  84.  "巨蟹座":[
  85.   [ [0.16,0.39],[0.27,0.36],[0.52,0.49],[0.57,0.65],[0.83,0.78],[0.44,0.21]],
  86.   [[0,1,2,3,4],[2,5]]
  87.  ],
  88.  "狮子座":[
  89.   [
  90.   [0.16,0.75],[0.23,0.67],[0.39,0.77],[0.71,0.53],[0.64,0.39],[0.55,0.37],[0.47,0.27],[0.54,0.24],[0.60,0.27],[0.85,0.56]],
  91.   [[0,1,2,3,4,5,6,7,8],[3,9]]
  92.  ],
  93.  "处女座":[
  94.   [[0.16,0.59],[0.35,0.63],[0.44,0.70],[0.62,0.51],[0.77,0.46],[0.84,0.37],[0.60,0.42],[0.65,0.26],[0.34,0.75]],
  95.   [[0,1,2,3,4,5],[3,6,7],[2,8]]
  96.  ],
  97.  "天蝎座":[
  98.   [[0.17,0.50],[0.28,0.63],[0.19,0.70],[0.28,0.78],[0.41,0.77],[0.49,0.72],[0.57,0.55],[0.59,0.44],[0.69,0.31],[0.74,0.21],[0.82,0.29],[0.79,0.44],[0.73,0.50],[0.38,0.47]],
  99.   [[0,1,2,3,4,5,6,7,8,9,10,11,12],[1,13],[8,11]]
  100.  ],
  101.  "射手座":[
  102.   [[0.22, 0.66],[0.24,0.51],[0.45,0.40],[0.54,0.37],[0.59,0.43],[0.66,0.50],[0.63,0.60],[0.66,0.67],[0.74,0.53],[0.77,0.39],[0.49,0.47],[0.29,0.68],[0.30,0.78],[0.48,0.21],[0.52,0.27],[0.59,0.29]],
  103.   [[0,1,2,3,4,5,6,7,8,9],[2,10,11,12],[10,4],[13,14,15,3],[14,3]]
  104.  ]
  105.  };
  106.  /*根据出生日期获取星座信息*/
  107.  function getStarSign(ts){
  108.  var d=new Date(ts),sign=d.getMonth()*100+d.getDate();
  109.  switch(true)
  110.  {
  111.   case sign<20:
  112.   return "摩羯座";
  113.   case sign<119:
  114.   return "水瓶座";
  115.   case sign<221:
  116.   return "双鱼座";
  117.   case sign<320:
  118.   return "白羊座";
  119.   case sign<421:
  120.   return "金牛座";
  121.   case sign<522:
  122.   return "双子座";
  123.   case sign<623:
  124.   return "巨蟹座";
  125.   case sign<723:
  126.   return "狮子座";
  127.   case sign<823:
  128.   return "处女座";
  129.   case sign<923:
  130.   return "天秤座";
  131.   case sign<1022:
  132.   return "天蝎座";
  133.   case sign<1122:
  134.   return "射手座";
  135.   default:
  136.   return "摩羯座";
  137.  }
  138.  }
  139.  /*绘制星座*/
  140.  function constellation(ctx,ary,w,h){
  141.  /*创建线条*/
  142.  var points=ary[0], lines=ary[1];
  143.  ctx.strokeStyle="#FFF";
  144.  var len=lines.length,i,ii,line,point;
  145.  ctx.beginPath();
  146.  while(len--)
  147.  {
  148.   i=1;
  149.   line=lines[len];
  150.   ii=line.length;
  151.   point=points[line[0]];
  152.   ctx.moveTo(point[0]*w,point[1]*h);
  153.   for(;i<ii;i++){
  154.   point=points[line[i]];
  155.   ctx.lineTo(point[0]*w,point[1]*h);
  156.   }
  157.  }
  158.  ctx.stroke();
  159.  /*创建小圆*/
  160.  var cur;
  161.  i=0;
  162.  ii=points.length;
  163.  for(;i<ii;i++){
  164.   cur=points[i];
  165.   new Circle(cur[0]*w,cur[1]*h).draw();//new出实例
  166.  }
  167.  }
  168.  /*创建小圆的构造函数*/
  169.  function Circle(x,y,r){
  170.  this.x=x;
  171.  this.y=y;
  172.  this.r=r||Math.round(Math.random()*8+4);
  173.  }
  174.  Circle.prototype={
  175.  draw:function(){
  176.   ctx.beginPath();
  177.   g1=ctx.createRadialGradient(this.x,this.y,Math.round(Math.random()*1+1),this.x,this.y,Math.round(Math.random()*3+6));
  178.   g1.addColorStop(0,'rgba(255,255,255,.9)');
  179.   g1.addColorStop(1,'rgba(0,0,0,.1)');
  180.   ctx.arc(this.x,this.y,this.r,0,Math.PI*2,true);
  181.   ctx.fillStyle =g1;
  182.   ctx.closePath();
  183.   ctx.fill();
  184.   return this;
  185.  }};
  186.  /*点击‘展示我的星空图'按钮*/
  187.  btn.onclick=function(e){
  188.  clearInterval(timer);
  189.  e.preventDefault();
  190.  if (!birth.value){
  191.   alert("请选择您的出生日期");
  192.  }else{
  193.   canvas.style.display="block";
  194.   date = new Date(birth.value.replace(/-/g,'/')).getTime();
  195.   timer=setInterval(function(){
  196.   ctx.clearRect(0,0,canvas.width,canvas.height);
  197.   ctx.strokeText(getStarSign(date), 50, 50);
  198.   constellation(ctx,star[getStarSign(date)],canvas.width,canvas.height);
  199.   },500);
  200.  }
  201.  };
  202. </script>
  203. </body>
  204. </html>

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