var WINDOW_WIDTH =1024;
var WINDOW_HEIGHT=768;
var RADIUS=8;
var MARGIN_LEFT=30;
var MARGIN_TOP=60;
const endTime=new Date(2016,6,13,18,00,00);
var curShowTimeSeconds=0;
var balls=[];
const colors=["#33B5E5","#0099CC","#AA66CC","#9933CC","#99CC00","#669900","#FFBB33","#FF8800","#FF4444","#CC0000"];
window.onload=function() {
var canvas=document.getElementById('canvas');
var context=canvas.getContext('2d');
canvas.width=WINDOW_WIDTH;
canvas.height=WINDOW_HEIGHT;
// 定义函数render
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-nextHours*3600)/60);
var nextSecond=nextShowTimeSeconds%60;
var curHours=parseInt(curShowTimeSeconds/3600);
var curMinutes=parseInt((curShowTimeSeconds-curHours*3600)/60);
var curSecond=curShowTimeSeconds%60;
if(nextSecond != curSecond){
if(parseInt(curHours/10)!= parseInt(nextHours/10)){
addBalls(MARGIN_LEFT,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(curSecond/10)!= parseInt(nextSecond/10)){
addBalls(MARGIN_LEFT+78*(RADIUS+1),MARGIN_TOP,parseInt(curSecond/10));
}
if(parseInt(curSecond%10)!= parseInt(nextSecond%10)){
addBalls(MARGIN_LEFT+93*(RADIUS+1),MARGIN_TOP,parseInt(nextSecond%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;
}
}
}
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 second=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(second/10),cxt);
renderDigit(MARGIN_LEFT+93*(RADIUS+1),MARGIN_TOP,parseInt(second%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();
}
}<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"> <title>Title</title></head><body><canvas id="canvas" style="display: block; margin:50px auto;"></canvas><script src="digit.js"></script><script src="countdown.js"></script></body></html>
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