效果：
html:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>digit</title>
</head>
<body>
<canvas id="canvas"></canvas>
<script src="digit_1.js"></script>
<script src="countdown.js"></script>
</body>
</html>
countdown.js:
var WINDOW_WIDTH = 1024;
var WINDOW_HEIGHT = 768;
var RADIUS = 8;
var MARGIN_TOP = 60;
var MARGIN_LEFT = 30;
const endTime = new Date(2017,8,17,18,30,00);//const声明变量，不可修改，必须声明时赋值；
var curShowTimeSeconds = 0;
window.onload = function () {
var canvas = document.getElementById("canvas");
var context = canvas.getContext("2d");
canvas.width = WINDOW_WIDTH;
canvas.height = WINDOW_HEIGHT;
curShowTimeSeconds = getCurrentShowTimeSeconds();
setInterval(
function () {
update();
render(context);
},50)
};
function getCurrentShowTimeSeconds() {
var curTime = new Date();//获取目前时间；
var ret = endTime.getTime()-curTime.getTime();
ret = Math.round(ret/1000);//获取秒数差值；
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) {
//每一帧都要对动画进行刷新，不然就会新的旧的叠在一起；
cxt.clearRect(0,0,WINDOW_WIDTH,WINDOW_HEIGHT);//对一个矩形空间里的动画进行刷新；
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++){//数组行
for(var j=0;j<digit[num][i].length;j++){//数组列
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();
}
}
}
}
时间： 2024-12-17 05:19:04