【HTML5】炫丽的时钟效果Canvas绘图与动画基础练习

源自慕课网

效果如下：

全部代码：

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
 <head>
  <title> new document </title>
  <meta name="generator" content="editplus" />
  <meta name="author" content="" />
  <meta name="keywords" content="" />
  <meta name="description" content="" />
 </head>
<style type="text/css">
	html,body{height:100%}
</style>
 <body>
  <canvas id="canvas" style="height:100%">
  当前浏览器不支持Canvas
  </canvas>
 </body>
</html>
<script type="text/javascript" src="digit.js"></script>
<script type="text/javascript" src="clockdown.js"></script>

逻辑代码：clockdown.js

var WINDOW_WIDTH=1024;
var WINDOW_HEIGHT=600;
var MARGIN_TOP=60;
var MARGIN_LEFT=30;
//存放彩色小球
var balls=[];

const colors=["#33B5E5","#0099CC","#AA66CC","#669900","#FFBB33","#FF8800","#FF4444","CC0000"];
var r=8;//圆半径
	window.onload=function(){
    WINDOW_WIDTH=document.body.clientWidth;
WINDOW_HEIGHT=document.body.clientHeight;
MARGIN_LEFT=Math.round(WINDOW_WIDTH/10);
r=Math.round(WINDOW_WIDTH*4/5/108)-1;
	var canvas=document.getElementById("canvas");
	var context=canvas.getContext("2d");
	canvas.width=WINDOW_WIDTH;
	canvas.height=WINDOW_HEIGHT;

    window.setInterval(function(){
	   var curr=new Date();
	   var curHours=curr.getHours();
	   var curMinutes=curr.getMinutes();
	   var curSeconds=curr.getSeconds();
      
       //当时间的秒数改变时添加彩色小球
	   if(preSeconds!=curSeconds)
	   {
        
        if(parseInt(curHours/10)!=parseInt(preHours/10)){
		addBall(MARGIN_LEFT,MARGIN_TOP,parseInt(curHours/10));		
		}
		  if(parseInt(curHours%10)!=parseInt(preHours%10)){
		addBall(MARGIN_LEFT+15*(r+1),MARGIN_TOP,parseInt(curHours%10));		
		}
		 if(parseInt(curMinutes/10)!=parseInt(preMinutes/10)){
		addBall(MARGIN_LEFT+39*(r+1),MARGIN_TOP,parseInt(curMinutes/10));		
		}
		  if(parseInt(curMinutes%10)!=parseInt(preMinutes%10)){
		addBall(MARGIN_LEFT+54*(r+1),MARGIN_TOP,parseInt(curMinutes%10));		
		}

		 if(parseInt(curSeconds/10)!=parseInt(preSeconds/10)){
		addBall(MARGIN_LEFT+78*(r+1),MARGIN_TOP,parseInt(curSeconds/10));		
		}
		  if(parseInt(curSeconds%10)!=parseInt(preSeconds%10)){
		addBall(MARGIN_LEFT+93*(r+1),MARGIN_TOP,parseInt(curSeconds%10));		
		}		
	   }
	   render(context);	
	  
		},50);
	
	}

	//添加小球(数字num上的彩色小球，x，y:数字方块容器的左上角顶点坐标)
    function addBall(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 ball={
					 x:x+j*2*(r+1)+r+1,
					 y:y+i*2*(r+1)+r+1,                     
					 g:1.5+Math.random(),
					 vx:Math.pow(-1,Math.ceil(Math.random()*1000))*9,//结果为-10/10
					 vy:-10,
                     color:colors[Math.floor(Math.random()*colors.length)]
					 };
					 balls.push(ball);

				 }
			 }
	     }
	}
  //----画彩色小球
  function renderBalls(context){
	  		//context.clearRect(0,0,WINDOW_WIDTH,WINDOW_HEIGHT)
     for (var i=0;i<balls.length ;i++ )
     {
        context.beginPath();
		context.arc(balls[i].x,balls[i].y,r,0,2*Math.PI,false);
		context.fillStyle=balls[i].color;
		context.fill();
		context.closePath();
     }
  }

 //----更新彩色小球位置
  function UpdateBalls(){
	  var count=0;
   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+r>=WINDOW_HEIGHT){
	 balls[i].y=WINDOW_HEIGHT-r;
	 balls[i].vy=-balls[i].vy*0.7;	 
	 }

	 if(balls[i].x+r>0&&balls[i].x-r<WINDOW_WIDTH){
	 balls[count++]=balls[i];}
	 
	 } 
	 //移除溢出的小球
	 while(balls.length>count){balls.pop();}
  }
  

	var preHours;
	var preMinutes;
	var preSeconds;

	//渲染整个画布
	function render(context)
	{
		context.clearRect(0,0,WINDOW_WIDTH,WINDOW_HEIGHT)
        var now=new Date();
		var hours=now.getHours();
		var minutes=now.getMinutes();
		var seconds=now.getSeconds();
		preHours=hours;
		preMinutes=minutes;
        preSeconds=seconds;
		//---时
	    renderDigit(MARGIN_LEFT,MARGIN_TOP,parseInt(hours/10),context);
	    renderDigit(MARGIN_LEFT+15*(r+1),MARGIN_TOP,hours%10,context);
        renderDigit(MARGIN_LEFT+30*(r+1),MARGIN_TOP,10,context);
        //---分
    	renderDigit(MARGIN_LEFT+39*(r+1),MARGIN_TOP,parseInt(minutes/10),context);
	    renderDigit(MARGIN_LEFT+54*(r+1),MARGIN_TOP,minutes%10,context);
	    renderDigit(MARGIN_LEFT+69*(r+1),MARGIN_TOP,10,context);
        //---秒
    	renderDigit(MARGIN_LEFT+78*(r+1),MARGIN_TOP,parseInt(seconds/10),context);
	    renderDigit(MARGIN_LEFT+93*(r+1),MARGIN_TOP,seconds%10,context);
        //---画小球
	    renderBalls(context);
		//---改变小球路径
	    UpdateBalls();

		console.log(balls.length);

	}
	//渲染每个数字
	function renderDigit(x,y,num,context)
	{
	context.fillStyle="green";
	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){
			context.beginPath();
			context.arc(x+j*2*(r+1)+r+1,y+i*2*(r+1)+r+1,r,0,2*Math.PI,false);
			context.closePath();
			context.fill();
			}
		}
	}
	}

　　

 

数字的结构定义：digit.js

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]
        ]//:
    ];

　　

【推广】 免费学中医，健康全家人
原文地址：https://www.cnblogs.com/Sunlimi/p/4344423.html