H5实现可缩放的时钟动画

互联网 18-3-27

这次给大家带来H5实现可缩放的时钟动画，H5实现可缩放时钟动画的注意事项有哪些，下面就是实战案例，一起来看一下。

废话不多说了，直接给大家贴代码了，具体代码如下所示：

<!DOCTYPE html>  <html lang="en">  <head>      <meta charset="UTF-8">      <title>canvas_time</title>      <style type="text/css">      p {          text-align: center;          margin-top: 250px;      }      #clock {          border: 1px solid #cccccc;      }      </style>  </head>  <body>      <p>          <canvas id="clock" height="600px" width="600px"></canvas>      </p>      <script type="text/JavaScript" >  var dom = document.getElementById('clock');  var ctx = dom.getContext('2d');  var width = ctx.canvas.width;  var height = ctx.canvas.height;  var r = width / 2;  var rem = width/200;  function drawBackground() {      ctx.save(); //存储当前环境变量；      ctx.translate(r, r); //重置坐标到r，r      ctx.beginPath(); // 起始一条路径      ctx.lineWidth = 10*rem; //设置线宽10；      ctx.arc(0, 0, r - ctx.lineWidth /2, 0, 2 * Math.PI, false);      ctx.stroke();      var hourNumbers = [3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 1, 2]; //定义数组      ctx.font = 18*rem+"px Arial";      ctx.textAlign = "center";      ctx.textBaseline = "middle";         hourNumbers.forEach(function(number, i) {          var rad = 2 * Math.PI / 12 * i;          var x = Math.cos(rad) * (r - 30*rem);          var y = Math.sin(rad) * (r - 30*rem);          ctx.fillText(number, x, y);      });      for (var i = 0; i < 60; i++) {          var rad = 2 * Math.PI / 60 * i;          var x = Math.cos(rad) * (r - 18*rem);          var y = Math.sin(rad) * (r - 18*rem);          ctx.beginPath();          if (i % 5 === 0) {              ctx.arc(x, y, 2*rem, 0, 2 * Math.PI, false);              ctx.fillStyle = "#000";          } else {              ctx.arc(x, y, 2*rem, 0, 2 * Math.PI, false);              ctx.fillStyle = "#ccc";          }          ctx.fill();      }  }      function drawHour(hour, minute) {          ctx.save();          ctx.beginPath();          var rad = 2 * Math.PI / 12 * hour;          var mrad = 2 * Math.PI / 12 / 60 * minute;          ctx.rotate(rad + mrad);          ctx.lineWidth = 6*rem;          ctx.lineCap = "round";          ctx.moveTo(0, 10*rem);          ctx.lineTo(0, -r / 2);          ctx.stroke();          ctx.restore();      }      function drawMinute(minute) {          ctx.save();          ctx.beginPath();          var rad = 2 * Math.PI / 60 * minute;          ctx.rotate(rad);          ctx.lineWidth = 3*rem;          ctx.lineCap = "round";          ctx.moveTo(0, 10*rem);          ctx.lineTo(0, -r + 30*rem);          ctx.stroke();          ctx.restore();      }      function drawSecond(second) {          ctx.save();          ctx.beginPath();          ctx.fillStyle = 'red';          var rad = 2 * Math.PI / 60 * second;          ctx.rotate(rad);          ctx.moveTo(-2*rem, 20*rem);          ctx.lineTo(2*rem, 20*rem);          ctx.lineTo(1, -r + 16*rem);          ctx.lineTo(-1, -r + 16*rem);          ctx.fill();          ctx.restore();      }      function drawDot() {          ctx.beginPath();          ctx.fillStyle = '#fff';          ctx.arc(0, 0, 3*rem, 0, 2 * Math.PI, false);          ctx.fill();      }      function draw01() {          ctx.clearRect(0, 0, width, height);          var now = new Date();          var hour = now.getHours();          var minute = now.getMinutes();          var second = now.getSeconds();          drawBackground();          drawHour(hour, minute);          drawMinute(minute);          drawSecond(second);          drawDot();          ctx.restore();      }      draw01();      setInterval(draw01, 1000);  </script>  </body>  </html>

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H5实现可缩放的时钟动画

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