canvas时钟效果

本文主要是介绍canvas时钟效果，对大家解决编程问题具有一定的参考价值，需要的程序猿们随着小编来一起学习吧！
效果如下：
代码如下：
<!DOCTYPE html>
<html>
 <head>
 <meta charset="UTF-8">
 <title>canvas时钟</title>
 <style type="text/css">
 *{
 margin: 0;
 padding: 0;
 }
 </style>
 <script>
 window.onload = function(){
 var WINDOW_WIDTH = document.body.scrollWidth;
 var WINDOW_HEIGHT = document.body.scrollHeight-10;
 var RADIUS = 7; //球半径
 var NUMBER_GAP = 10; //数字之间的间隙
 var u = 0.65; //碰撞能量损耗系数
 var context; //Canvas绘制上下文
 var balls = []; //存储彩色的小球
 const colors = ["#33B5E5", "#0099CC", "#AA66CC", "#9933CC", "#99CC00", "#669900", "#FFBB33", "#FF8800", "#FF4444", "#CC0000"]; //彩色小球的颜色
 var currentNums = []; //屏幕显示的8个字符
 var digit = [
  [
  [0, 0, 1, 1, 1, 0, 0],
  [0, 1, 1, 0, 1, 1, 0],
  [1, 1, 0, 0, 0, 1, 1],
  [1, 1, 0, 0, 0, 1, 1],
  [1, 1, 0, 0, 0, 1, 1],
  [1, 1, 0, 0, 0, 1, 1],
  [1, 1, 0, 0, 0, 1, 1],
  [1, 1, 0, 0, 0, 1, 1],
  [0, 1, 1, 0, 1, 1, 0],
  [0, 0, 1, 1, 1, 0, 0]
  ], //0
  [
  [0, 0, 0, 1, 1, 0, 0],
  [0, 1, 1, 1, 1, 0, 0],
  [0, 0, 0, 1, 1, 0, 0],
  [0, 0, 0, 1, 1, 0, 0],
  [0, 0, 0, 1, 1, 0, 0],
  [0, 0, 0, 1, 1, 0, 0],
  [0, 0, 0, 1, 1, 0, 0],
  [0, 0, 0, 1, 1, 0, 0],
  [0, 0, 0, 1, 1, 0, 0],
  [1, 1, 1, 1, 1, 1, 1]
  ], //1
  [
  [0, 1, 1, 1, 1, 1, 0],
  [1, 1, 0, 0, 0, 1, 1],
  [0, 0, 0, 0, 0, 1, 1],
  [0, 0, 0, 0, 1, 1, 0],
  [0, 0, 0, 1, 1, 0, 0],
  [0, 0, 1, 1, 0, 0, 0],
  [0, 1, 1, 0, 0, 0, 0],
  [1, 1, 0, 0, 0, 0, 0],
  [1, 1, 0, 0, 0, 1, 1],
  [1, 1, 1, 1, 1, 1, 1]
  ], //2
  [
  [1, 1, 1, 1, 1, 1, 1],
  [0, 0, 0, 0, 0, 1, 1],
  [0, 0, 0, 0, 1, 1, 0],
  [0, 0, 0, 1, 1, 0, 0],
  [0, 0, 1, 1, 1, 0, 0],
  [0, 0, 0, 0, 1, 1, 0],
  [0, 0, 0, 0, 0, 1, 1],
  [0, 0, 0, 0, 0, 1, 1],
  [1, 1, 0, 0, 0, 1, 1],
  [0, 1, 1, 1, 1, 1, 0]
  ], //3
  [
  [0, 0, 0, 0, 1, 1, 0],
  [0, 0, 0, 1, 1, 1, 0],
  [0, 0, 1, 1, 1, 1, 0],
  [0, 1, 1, 0, 1, 1, 0],
  [1, 1, 0, 0, 1, 1, 0],
  [1, 1, 1, 1, 1, 1, 1],
  [0, 0, 0, 0, 1, 1, 0],
  [0, 0, 0, 0, 1, 1, 0],
  [0, 0, 0, 0, 1, 1, 0],
  [0, 0, 0, 1, 1, 1, 1]
  ], //4
  [
  [1, 1, 1, 1, 1, 1, 1],
  [1, 1, 0, 0, 0, 0, 0],
  [1, 1, 0, 0, 0, 0, 0],
  [1, 1, 1, 1, 1, 1, 0],
  [0, 0, 0, 0, 0, 1, 1],
  [0, 0, 0, 0, 0, 1, 1],
  [0, 0, 0, 0, 0, 1, 1],
  [0, 0, 0, 0, 0, 1, 1],
  [1, 1, 0, 0, 0, 1, 1],
  [0, 1, 1, 1, 1, 1, 0]
  ], //5
  [
  [0, 0, 0, 0, 1, 1, 0],
  [0, 0, 1, 1, 0, 0, 0],
  [0, 1, 1, 0, 0, 0, 0],
  [1, 1, 0, 0, 0, 0, 0],
  [1, 1, 0, 1, 1, 1, 0],
  [1, 1, 0, 0, 0, 1, 1],
  [1, 1, 0, 0, 0, 1, 1],
  [1, 1, 0, 0, 0, 1, 1],
  [1, 1, 0, 0, 0, 1, 1],
  [0, 1, 1, 1, 1, 1, 0]
  ], //6
  [
  [1, 1, 1, 1, 1, 1, 1],
  [1, 1, 0, 0, 0, 1, 1],
  [0, 0, 0, 0, 1, 1, 0],
  [0, 0, 0, 0, 1, 1, 0],
  [0, 0, 0, 1, 1, 0, 0],
  [0, 0, 0, 1, 1, 0, 0],
  [0, 0, 1, 1, 0, 0, 0],
  [0, 0, 1, 1, 0, 0, 0],
  [0, 0, 1, 1, 0, 0, 0],
  [0, 0, 1, 1, 0, 0, 0]
  ], //7
  [
  [0, 1, 1, 1, 1, 1, 0],
  [1, 1, 0, 0, 0, 1, 1],
  [1, 1, 0, 0, 0, 1, 1],
  [1, 1, 0, 0, 0, 1, 1],
  [0, 1, 1, 1, 1, 1, 0],
  [1, 1, 0, 0, 0, 1, 1],
  [1, 1, 0, 0, 0, 1, 1],
  [1, 1, 0, 0, 0, 1, 1],
  [1, 1, 0, 0, 0, 1, 1],
  [0, 1, 1, 1, 1, 1, 0]
  ], //8
  [
  [0, 1, 1, 1, 1, 1, 0],
  [1, 1, 0, 0, 0, 1, 1],
  [1, 1, 0, 0, 0, 1, 1],
  [1, 1, 0, 0, 0, 1, 1],
  [0, 1, 1, 1, 0, 1, 1],
  [0, 0, 0, 0, 0, 1, 1],
  [0, 0, 0, 0, 0, 1, 1],
  [0, 0, 0, 0, 1, 1, 0],
  [0, 0, 0, 1, 1, 0, 0],
  [0, 1, 1, 0, 0, 0, 0]
  ], //9
  [
  [0, 0, 0, 0],
  [0, 0, 0, 0],
  [0, 1, 1, 0],
  [0, 1, 1, 0],
  [0, 0, 0, 0],
  [0, 0, 0, 0],
  [0, 1, 1, 0],
  [0, 1, 1, 0],
  [0, 0, 0, 0],
  [0, 0, 0, 0]
  ] //:
 ];
 function drawDatetime(cxt) {
  var nums = [];
  var date = new Date();
  var hours = date.getHours();
  var num1 = Math.floor(hours / 10);
  var num2 = hours % 10;
  context.fillStyle = colors[(date.getSeconds()%10)];
  var offsetX = WINDOW_WIDTH/4,
  offsetY = 30;
  nums.push({
  num: num1
  });
  nums.push({
  num: num2
  });
  nums.push({
  num: 10
  }); //冒号
  var minutes = date.getMinutes();
  var num1 = Math.floor(minutes / 10);
  var num2 = minutes % 10;
  nums.push({
  num: num1
  });
  nums.push({
  num: num2
  });
  nums.push({
  num: 10
  }); //冒号
  var seconds = date.getSeconds();
  var num1 = Math.floor(seconds / 10);
  var num2 = seconds % 10;
  nums.push({
  num: num1
  });
  nums.push({
  num: num2
  });
  for(var x = 0; x < nums.length; x++) {
  nums[x].offsetX = offsetX;
  offsetX = drawSingleNumber(offsetX, offsetY, nums[x].num, cxt);
  //两个数字连一块，应该间隔一些距离
  if(x < nums.length - 1) {
  if((nums[x].num != 10) && (nums[x + 1].num != 10)) {
  offsetX += NUMBER_GAP;
  }
  }
  }
  //说明这是初始化
  if(currentNums.length == 0) {
  currentNums = nums;
  } else {
  //进行比较
  for(var index = 0; index < currentNums.length; index++) {
  if(currentNums[index].num != nums[index].num) {
  //不一样时，添加彩色小球
  addBalls(nums[index]);
  currentNums[index].num = nums[index].num;
  }
  }
  }
  renderBalls(cxt);
  updateBalls();
  return date;
 }
 function addBalls(item) {
  var num = item.num;
  var numMatrix = digit[num];
  for(var y = 0; y < numMatrix.length; y++) {
  for(var x = 0; x < numMatrix[y].length; x++) {
  if(numMatrix[y][x] == 1) {
  var ball = {
   offsetX: item.offsetX + RADIUS + RADIUS * 2 * x,
   offsetY: 30 + RADIUS + RADIUS * 2 * y,
   color: colors[Math.floor(Math.random() * colors.length)],
   g: 1.5 + Math.random(),
   vx: Math.pow(-1, Math.ceil(Math.random() * 10)) * 4 + Math.random(),
   vy: -5
  }
  balls.push(ball);
  }
  }
  }
 }
 function renderBalls(cxt) {
  for(var index = 0; index < balls.length; index++) {
  cxt.beginPath();
  cxt.fillStyle = balls[index].color;
  cxt.arc(balls[index].offsetX, balls[index].offsetY, RADIUS, 0, 2 * Math.PI);
  cxt.fill();
  }
 }
 function updateBalls() {
  var i = 0;
  for(var index = 0; index < balls.length; index++) {
  var ball = balls[index];
  ball.offsetX += ball.vx;
  ball.offsetY += ball.vy;
  ball.vy += ball.g;
  if(ball.offsetY > (WINDOW_HEIGHT - RADIUS)) {
  ball.offsetY = WINDOW_HEIGHT - RADIUS;
  ball.vy = -ball.vy * u;
  }
  if(ball.offsetX > RADIUS && ball.offsetX < (WINDOW_WIDTH - RADIUS)) {
  balls[i] = balls[index];
  i++;
  }
  }
  //去除出边界的球
  for(; i < balls.length; i++) {
  balls.pop();
  }
 }
 function drawSingleNumber(offsetX, offsetY, num, cxt) {
  var numMatrix = digit[num];
  for(var y = 0; y < numMatrix.length; y++) {
  for(var x = 0; x < numMatrix[y].length; x++) {
  if(numMatrix[y][x] == 1) {
  cxt.beginPath();
  cxt.arc(offsetX + RADIUS + RADIUS * 2 * x, offsetY + RADIUS + RADIUS * 2 * y, RADIUS, 0, 2 * Math.PI);
  cxt.fill();
  }
  }
  }
  cxt.beginPath();
  offsetX += numMatrix[0].length * RADIUS * 2;
  return offsetX;
 }
 var canvas = document.getElementById("canvas");
 canvas.width = WINDOW_WIDTH;
 canvas.height = WINDOW_HEIGHT;
 context = canvas.getContext("2d");
 //记录当前绘制的时刻
 var currentDate = new Date();
 setInterval(function() {
  //清空整个Canvas，重新绘制内容
  context.clearRect(0, 0, context.canvas.width, context.canvas.height);
  drawDatetime(context);
 }, 50)
 }
 </script>
 </head>
 <body>
 <canvas id="canvas"></canvas>
 </body>
</html>
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