canvas小案列-绚丽多彩的倒计时
本次随笔中，我将实现一个绚丽的倒计时效果，这个效果主要是结合canvas和js实现的，具体代码如下
index.html文件
<!DOCTYPE html>
<html>
<head>
</head>
<body style="height:100%">
<canvas id="canvas" style="height:100%">
</canvas> <script src="digit.js"></script>
<script src="countdown.js"></script>
</body>
</html>
接着书写digit.js文件，这个文件中主要是一个三维数组，观察可以发现，总共有十个二维数组，分别对应1...9和：
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]
],//
[
[0,0,0,1,1,0,0],
[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]
],//
[
[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]
],//
[
[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]
],//
[
[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]
],//
[
[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]
],//
[
[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]
],//
[
[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]
],//
[
[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]
],//
[
[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]
],//
[
[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]
]//:
];
最后实现整个效果的代码书写在countdown.js中
var WINDOW_WIDTH=1024;
var WINDOW_HEIGHT=768;
var RADIUS=8;
var MARGIN_TOP=60;
var MARGIN_LEFT=30;
var endTime=new Date();
endTime.setTime(endTime.getTime()+3600*1000); var curShowTimeSeconds=0;
var balls=[];
const colors=["#33b5E5","#0099cc","#aa66cc","#9933cc","#99cc00","#669900","#FFBB33","#FF8800","#FF4444","#cc0000"];
window.onload=function(){
WINDOW_WIDTH=document.body.clientWidth;
WINDOW_HEIGHT=768; MARGIN_LEFT=Math.round(WINDOW_WIDTH/10);
RADIUS=Math.round(WINDOW_WIDTH*4/5/108)-1;
MARGIN_TOP=Math.round(WINDOW_HEIGHT/5);
var canvas=document.getElementById("canvas");
var context=canvas.getContext("2d");
canvas.width=WINDOW_WIDTH;;
canvas.height=WINDOW_HEIGHT; curShowTimeSeconds=getCurrentShowTimeSeconds();
setInterval(
function(){
render(context);
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/60%60);
var nextSeconds=parseInt(nextShowTimeSeconds%60); var curHours=parseInt(curShowTimeSeconds/3600);
var curMinutes=parseInt(curShowTimeSeconds/60%60);
var curSeconds=parseInt(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>=WINDOW_HEIGHT-RADIUS){
balls[i].y=WINDOW_HEIGHT-RADIUS;
balls[i].vy=-balls[i].vy*0.75;
}
}
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>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/60%60);
var seconds=parseInt(curShowTimeSeconds%60);
//var hours=12;
//var minutes=34;
// var seconds=56;
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()
}
}
大家赶快来试验一下吧！
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