>炫丽的计时器效果Canvas绘图与动画<
虽然我是学习java的，但是因为最近使用html5的关系，多学习了一下前端知识。
现在，我要介绍的计时器是十分炫酷的，使用画布完成。
喜欢html5和喜欢炫酷特效的同学可以收藏一下。
-----------------------------------------华丽的分割线----------------------------------------------------
首先，介绍一下文件的效果。
看起来是非常的炫酷的。
-----------------------------------------下面是代码部分，代码注释得很清楚了，就不多废话了----------------------------------------------------
index.html ->
<!DOCTYPE html>
<html lang="zh">
<head>
<meta charset="UTF-8">
<title>炫丽的计时器效果-Canvas绘图与动画-</title>
<script src="js/countdown.js"></script>
<script src="js/digit.js"></script>
</head>
<body style="height:100%;width:100%;">
<canvas id="canvas" style="height:100%;width:100%;"></canvas>
</body>
</html>
countdown.js ->
var window_width = 1440;/*页面的宽度*/
var window_height = 900;/*页面的高度*/
var radius = 8;/*小球的半径*/
var margin_top = 60;/*元素的上外边距*/
var margin_left = 30;/*元素的左外边距*/ var curShowTimeSeconds = 0;/*获取当天的秒数*/ var balls = [];/*小球的集合*/
const colors = ["#33b5e5","#0099cc","#aa66cc","#9933cc","#99cc00","#669900","#ffbb33","#ff8800","#ff4444","#cc0000"];/*颜色集合*/ window.onload = function(){
/*判断是否支持canvas,
* 初始化页面*/
window_width = document.body.clientWidth;
window_height = document.body.clientHeight; margin_left = Math.round(window_width/10);
radius = Math.round(window_width*4/5/108)-1; margin_top = Math.round(window_height/5); /*获取canvas对象*/
var canvas = document.getElementById("canvas");
/*判断浏览器是否支持Canvas*/
if(canvas.getContext("2d")){
var context = canvas.getContext("2d");
/*使用context绘制*/
}else{
alert("当前浏览器不支持Canvas，请更换浏览器后再试");
} canvas.width = window_width;
canvas.height = window_height; curShowTimeSeconds = getCurrentShowTimeSeconds();
setInterval(function(){
render(context);
update();
},50);
} function getCurrentShowTimeSeconds(){
/*获取当天的秒数*/
var curTime = new Date();
var ret = curTime.getHours()*3600 + curTime.getMinutes()*60 + curTime.getSeconds(); return ret;
} function update(){
/*负责数据的改变*/ 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(nextSeconds%10));
} curShowTimeSeconds = nextShowTimeSeconds;
} updateBalls();
} function updateBalls(){
/*更新小球*/
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;
}
} /*性能优化*/
var count = 0;
for(var i=0;i<balls.length;i++){
if(balls[i].x+radius>0 && balls[i].x - radius < window_width){
balls[count++] = balls[i];
}
}
while(balls.length>Math.min(300,count)){
balls.pop();
}
}
function addBalls(x,y,num){
/*增加数字变化时跳动的小球*/
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, //取-1或者1
vy:-5, //小球向上抛的效果
color:colors[Math.floor(Math.random()*colors.length)]
} balls.push(aBall);
}
}
}
} function render(cxt){
/*负责绘制*/
/*对矩形空间内进行刷新操作*/
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){
/*绘制数字,
* 通过一点一点增加变成数字*/
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();
}
}
}
}
digit.js ->
/*绘图的坐标*/
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]
]/*:*/
];
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