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canvas制作倒计时炫丽效果

<!DOCTYPE html>
<head>
<title>canvas倒计时</title>
<style>
.canvas{
   display: block;
   border: 1px solid #000;
   margin: 50px auto;
}
</style>
</head>
<body>
<canvas class="canvas" id="canvas"></canvas>
<script>
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],
       [1,1,0,0,1,1,0],
       [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
    [
       [0,0,0,0,1,1,1],
       [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],
    ] //:
    
];

var WINDOW_HEIGHT = 468;
var WINDOW_WIDTH = 1024;
var RADIUS = 8;
var MARGIN_TOP = 60;
var MARGIN_LEFT = 30;

//const endTime = new Date(2017,1,03,28,18,09);
var endTime = new Date();
    endTime.setTime(endTime.getTime()+3600*1000);
var curShowTimeSeconds = 0;

var balls = [];
var colors = ['#33B5E5','#0099CC','#AA66CC','#9933CC','#99CC00','#669900','#FF8800','FF8888','#CC0000'];

window.onload = function(){
     var canvas = document.getElementById('canvas');
     var cxt = canvas.getContext('2d');

     canvas.height = WINDOW_HEIGHT;
     canvas.width = WINDOW_WIDTH;
     
     curShowTimeSeconds = getCurrentShowTimeSeconds();
     
     setInterval(function(){
          render(cxt);
          update();
     },50);
}
function getCurrentShowTimeSeconds(){
     var curTime = new Date();
     var ret = endTime.getTime() - curTime.getTime();
     ret = Math.round(ret/1000);
     
     return ret >=0? ret : 0;
}
function update(){

     var nextShowTimeSeconds = getCurrentShowTimeSeconds();
     
     var nextHours = parseInt(nextShowTimeSeconds / 3600);
     var nextMinutes = parseInt((nextShowTimeSeconds -nextHours*3600)/ 60);
     var nextSeconds = nextShowTimeSeconds % 60;
     
     var curHours = parseInt(curShowTimeSeconds / 3600);
     var curMinutes = parseInt((curShowTimeSeconds -curHours*3600)/ 60);
     var curSeconds = curShowTimeSeconds% 60;
     
     if(nextSeconds != curSeconds){
     
        if(parseInt(curHours/10) != parseInt(nextHours/10)){
            addBalls(MARGIN_LEFT + 0, MARGIN_TOP, parseInt(curHours/10));
        }    
        if(parseInt(curHours%10) != parseInt(nextHours%10)){
            addBalls(MARGIN_LEFT + 15*(RADIUS+1), MARGIN_TOP, parseInt(curHours/10));
        }
        if(parseInt(curMinutes/10) != parseInt(nextMinutes/10)){
            addBalls(MARGIN_LEFT + 39*(RADIUS+1), MARGIN_TOP, parseInt(curMinutes/10));
        }
        if(parseInt(curMinutes%10) != parseInt(nextMinutes%10)){
            addBalls(MARGIN_LEFT + 54*(RADIUS+1), MARGIN_TOP, parseInt(curMinutes%10));
        }    
        if(parseInt(curSeconds/10) != parseInt(nextSeconds/10)){
            addBalls(MARGIN_LEFT + 78*(RADIUS+1), MARGIN_TOP, parseInt(curSeconds/10));
        }
        if(parseInt(curSeconds%10) != parseInt(nextSeconds%10)){
            addBalls(MARGIN_LEFT + 93*(RADIUS+1), MARGIN_TOP, parseInt(curSeconds%10));
        }        
     
         curShowTimeSeconds = nextShowTimeSeconds;
     }
     
     updateBalls();
}
function updateBalls(){
   for(var i= 0; i< balls.length; i++){
         balls[i].x += balls[i].vx;
         balls[i].y += balls[i].vy;
         balls[i].vy += balls[i].g;
         
         if(balls[i].y >= canvas.height -RADIUS){
         
            balls[i].y = canvas.height - RADIUS;
            balls[i].vy = -balls[i].vy*0.65; //加一个摩擦力系数
         }
   }
   
   
   var cnt = 0;
   for(var i= 0; i< balls.length; i++){
       if(balls[i].x + RADIUS > 0 && balls[i].x - RADIUS < WINDOW_WIDTH){
          balls[cnt++] = balls[i];
       }
   }
   while(balls.length > Math.min(300,cnt)){
              balls.pop();
     }
}
function addBalls(x, y, num){
    for(var i=0; i<digit[num].length; i++){
       for(var j=0; j<digit[num][i].length; j++){
          if(digit[num][i][j] == 1){
              var aBall = {
                 x: x+j*2*(RADIUS+1) +(RADIUS+1),
                 y: y+i*2*(RADIUS+1) +(RADIUS+1),
                 g: 1.5+Math.random(),
                 vx: Math.pow(-1, Math.ceil(Math.random()*1000))*4,
                 vy: -5,
                 color: colors[Math.floor(Math.random()*colors.length)]
              };
              
              balls.push(aBall);
          }
       }
    
    }
}
function render(cxt){

     cxt.clearRect(0,0, WINDOW_WIDTH, WINDOW_HEIGHT);
     
     var hours = parseInt(curShowTimeSeconds / 3600);
     var minutes = parseInt((curShowTimeSeconds -hours*3600)/ 60);
     var seconds = curShowTimeSeconds% 60;
      
     renderDigit(MARGIN_LEFT, MARGIN_TOP, parseInt(hours/10), cxt);
     renderDigit(MARGIN_LEFT+15*(RADIUS+1), MARGIN_TOP, parseInt(hours%10), cxt);
     renderDigit(MARGIN_LEFT+30*(RADIUS+1), MARGIN_TOP, 10, cxt);
     renderDigit(MARGIN_LEFT+39*(RADIUS+1), MARGIN_TOP, parseInt(minutes/10), cxt);
     renderDigit(MARGIN_LEFT+54*(RADIUS+1), MARGIN_TOP, parseInt(minutes%10), cxt);
     renderDigit(MARGIN_LEFT+69*(RADIUS+1), MARGIN_TOP, 10, cxt);
     renderDigit(MARGIN_LEFT+78*(RADIUS+1), MARGIN_TOP, parseInt(seconds/10), cxt);
     renderDigit(MARGIN_LEFT+93*(RADIUS+1), MARGIN_TOP, parseInt(seconds%10), cxt);

     for(var i=0; i < balls.length; i++){
         cxt.fillStyle = balls[i].color;
         
         cxt.beginPath();
         cxt.arc(balls[i].x, balls[i].y, RADIUS, 0, 2*Math.PI, true);
         cxt.closePath();
         
         cxt.fill();
     }
}
function renderDigit(x,y, num, cxt){

     cxt.fillStyle = 'rgb(0,102,153)';
     
     for(var i =0; i<digit[num].length; i++){
          for(var j =0; j<digit[num][i].length; j++){
              if(digit[num][i][j] == 1){
                   cxt.beginPath();
                   cxt.arc( x+j*2*(RADIUS+1)+(RADIUS+1), y+i*2*(RADIUS+1)+(RADIUS+1), RADIUS, 0, 2*Math.PI);
                   cxt.closePath();
                   cxt.fill();
              }
        }
     }
}
</script>

</body>
</html>

View Code

<!DOCTYPE html>
<head>
<title>canvas倒计时</title>
<style>
.canvas{
   display: block;
   border: 1px solid #000;
   margin: 50px auto;
}
</style>
</head>
<body>
<canvas class="canvas" id="canvas"></canvas>

<script>
   var ball = {x: 512, y:100, r:20, g:2, vx: -1, vy: 0, color: '#005588'};
   window.onload = function(){
         var canvas = document.getElementById('canvas');
         var cxt = canvas.getContext('2d');
         
         canvas.width = 1024;
         canvas.height = 468;
         
         setInterval(function(){
              render(cxt);
              update();
         },50);
   }
   function update(){
         ball.x += ball.vx;
         ball.y += ball.vy;
         ball.vy += ball.g;
   }
   function render(cxt){
         cxt.clearRect(0,0,cxt.canvas.width,canvas.height);
         
         cxt.fillStyle = ball.color;
         cxt.beginPath();
         cxt.arc(ball.x, ball.y, ball.r, 0, 2*Math.PI);
         cxt.closePath();
         
         cxt.fill();
   }
</script>
</body>
</html>

View Code

<!DOCTYPE html>
<head>
<title>canvas倒计时</title>
<style>
.canvas{
   display: block;
   border: 1px solid #000;
   margin: 50px auto;
}
</style>
</head>
<body>
<canvas class="canvas" id="canvas"></canvas>
<script>
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],
       [1,1,0,0,1,1,0],
       [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
    [
       [0,0,0,0,1,1,1],
       [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],
    ] //:
    
];

var WINDOW_HEIGHT = 468;
var WINDOW_WIDTH = 1024;
var RADIUS = 8;
var MARGIN_TOP = 60;
var MARGIN_LEFT = 30;

const endTime = new Date(2017,1,03,28,18,09);
var curShowTimeSeconds = 0;

window.onload = function(){
     var canvas = document.getElementById('canvas');
     var cxt = canvas.getContext('2d');

     canvas.height = WINDOW_HEIGHT;
     canvas.width = WINDOW_WIDTH;
     
     curShowTimeSeconds = getCurrentShowTimeSeconds();
     
     setInterval(function(){
          render(cxt);
          update();
     },50);
}
function getCurrentShowTimeSeconds(){
     var curTime = new Date();
     var ret = endTime.getTime() - curTime.getTime();
     ret = Math.round(ret/1000);
     
     return ret >=0? ret : 0;
}
function update(){

     var nextShowTimeSeconds = getCurrentShowTimeSeconds();
     
     var nextHours = parseInt(nextShowTimeSeconds / 3600);
     var nextMinutes = parseInt((nextShowTimeSeconds -nextHours*3600)/ 60);
     var nextSeconds = nextShowTimeSeconds % 60;
     
     var curHours = parseInt(curShowTimeSeconds / 3600);
     var curMinutes = parseInt((curShowTimeSeconds -curHours*3600)/ 60);
     var curSeconds = curShowTimeSeconds% 60;
     
     if(nextSeconds != curSeconds){
     
         curShowTimeSeconds = nextShowTimeSeconds;
     }
}
function render(cxt){

     cxt.clearRect(0,0, WINDOW_WIDTH, WINDOW_HEIGHT);
     
     var hours = parseInt(curShowTimeSeconds / 3600);
     var minutes = parseInt((curShowTimeSeconds -hours*3600)/ 60);
     var seconds = curShowTimeSeconds% 60;
      
     renderDigit(MARGIN_LEFT, MARGIN_TOP, parseInt(hours/10), cxt);
     renderDigit(MARGIN_LEFT+15*(RADIUS+1), MARGIN_TOP, parseInt(hours%10), cxt);
     renderDigit(MARGIN_LEFT+30*(RADIUS+1), MARGIN_TOP, 10, cxt);
     renderDigit(MARGIN_LEFT+39*(RADIUS+1), MARGIN_TOP, parseInt(minutes/10), cxt);
     renderDigit(MARGIN_LEFT+54*(RADIUS+1), MARGIN_TOP, parseInt(minutes%10), cxt);
     renderDigit(MARGIN_LEFT+69*(RADIUS+1), MARGIN_TOP, 10, cxt);
     renderDigit(MARGIN_LEFT+78*(RADIUS+1), MARGIN_TOP, parseInt(seconds/10), cxt);
     renderDigit(MARGIN_LEFT+93*(RADIUS+1), MARGIN_TOP, parseInt(seconds%10), cxt);
}
function renderDigit(x,y, num, cxt){

     cxt.fillStyle = 'rgb(0,102,153)';
     
     for(var i =0; i<digit[num].length; i++){
          for(var j =0; j<digit[num][i].length; j++){
              if(digit[num][i][j] == 1){
                   cxt.beginPath();
                   cxt.arc( x+j*2*(RADIUS+1)+(RADIUS+1), y+i*2*(RADIUS+1)+(RADIUS+1), RADIUS, 0, 2*Math.PI);
                   cxt.closePath();
                   cxt.fill();
              }
        }
     }
}
</script>
<script>
   var ball = {x: 512, y:100, r:20, g:2, vx: -1, vy: 0, color: '#005588'};
   window.onload = function(){
         var canvas = document.getElementById('canvas');
         var cxt = canvas.getContext('2d');
         
         canvas.width = 1024;
         canvas.height = 468;
         
         setInterval(function(){
              render(cxt);
              update();
         },50);
   }
   function update(){
         ball.x += ball.vx;
         ball.y += ball.vy;
         ball.vy += ball.g;
         
         if(ball.y >= canvas.height -ball.r){
         
            ball.y = canvas.height - ball.r;
            ball.vy = -ball.vy*0.6; //加一个摩擦力系数
         }
   }
   function render(cxt){
         cxt.clearRect(0,0,cxt.canvas.width,canvas.height);
         
         cxt.fillStyle = ball.color;
         cxt.beginPath();
         cxt.arc(ball.x, ball.y, ball.r, 0, 2*Math.PI);
         cxt.closePath();
         
         cxt.fill();
   }
</script>
</body>
</html>

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原文地址：https://www.cnblogs.com/aliwa/p/6360518.html