canvas时钟效果

更新时间：2020-04-23 14:05:02 作者：startmvc

效果如下：代码如下：<!DOCTYPEhtml><html><head><metacharset="UTF-8"><title>canvas

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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