HTML5自学笔记[ 19 ]canvas绘图实例之炫彩时钟
<!DOCTYPE html>
<html>
<head lang="en">
<meta charset="UTF-8">
<title>炫彩时钟</title>
<style>
body{ background:#000;}
canvas{ background:#fff; }
</style>
<script src="countdown.js"></script>
<script src="digit.js"></script>
</head>
<body>
<canvas id="canvas1"></canvas>
</body>
</html>
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]
]//:
];
/**
* Created by dell on 2016/1/29.
*/
window.onload = function(){
var CVS_WIDTH = document.body.clientWidth * 4/5;
var CVS_HEIGHT = document.body.clientHeight * 4/5;
var MARGIN_LEFT = document.body.clientWidth * 1/10;
var MARGIN_TOP = document.body.clientHeight * 1/10;
var RADIUS = (CVS_WIDTH*4/5)/108 - 1;
var PADDINGLEFT = (CVS_WIDTH - 108*(RADIUS+1))/2;
var color = '#00688B';//数字颜色
var curShowTime = getCurShowTime();//当前剩余时间
var colors = ['#FF3030','#7CCD7C','#0000EE','#EE9A49','#EEEE00','#FF00FF','#96CDCD','#D15FEE','#EEAEEE','#EEDC82'];//彩球颜色集合
var balls = [];
var oCvs = document.getElementById('canvas1');
var oCxt = oCvs.getContext('2d');
//设置画布大小
oCvs.width = CVS_WIDTH;
oCvs.height = CVS_HEIGHT;
oCvs.style.marginLeft = MARGIN_LEFT + 'px';
oCvs.style.marginTop = MARGIN_TOP + 'px';
setInterval(function () {
render(oCxt);
update();
},50);
function update(){
var nextShowTime = getCurShowTime();
var nextHour = parseInt(nextShowTime/3600);
var nextMin = parseInt((nextShowTime - nextHour*3600)/60);
var nextSec = parseInt(nextShowTime%60);
var curHour = parseInt(curShowTime/3600);
var curMin = parseInt((curShowTime - curHour*3600)/60);
var curSec = parseInt(curShowTime%60);
if(nextSec != curSec){
curShowTime = nextShowTime;
if(parseInt(nextHour/10) != parseInt(curHour/10)){
addBalls(PADDINGLEFT,MARGIN_TOP,parseInt(nextSec/10));
}
if(parseInt(nextHour%10) != parseInt(curHour%10)){
addBalls(PADDINGLEFT+15*(RADIUS+1),MARGIN_TOP,parseInt(nextSec%10));
}
if(parseInt(nextMin/10) != parseInt(curMin/10)){
addBalls(PADDINGLEFT+40*(RADIUS+1),MARGIN_TOP,parseInt(nextSec/10));
}
if(parseInt(nextMin%10) != parseInt(curMin%10)){
addBalls(PADDINGLEFT+55*(RADIUS+1),MARGIN_TOP,parseInt(nextSec%10));
}
if(parseInt(nextSec/10) != parseInt(curSec/10)){
addBalls(PADDINGLEFT+79*(RADIUS+1),MARGIN_TOP,parseInt(nextSec/10));
}
if(parseInt(nextSec%10) != parseInt(curSec%10)){
addBalls(PADDINGLEFT+94*(RADIUS+1),MARGIN_TOP,parseInt(nextSec%10));
}
//console.info(balls)
}
updateBalls();
//console.info(balls.length)
}
function updateBalls(){
for(var i=0;i<balls.length;i++) {
balls[i].x += balls[i].xv;
balls[i].y += balls[i].yv;
balls[i].yv += balls[i].g;
if(balls[i].y >= CVS_HEIGHT-RADIUS){
balls[i].y = CVS_HEIGHT - RADIUS;
balls[i].yv = -balls[i].yv*0.75;
}
}
var num = 0;
for(var j=0;j<balls.length;j++){
if(balls[j].x+RADIUS>0 && balls[j].x-RADIUS<CVS_WIDTH){
balls[num++] = balls[j];
}
}
balls = balls.slice(0,Math.min(500,num));
}
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 ball = {
x:x+j*2*(RADIUS+1)+(RADIUS+1),
y:y+i*2*(RADIUS+1)+(RADIUS+1),
color:colors[Math.floor(Math.random()*colors.length)],
g:1.5+Math.random(),
xv:Math.pow(-1,Math.ceil(Math.random()*1000))*4,
yv:-10
};
balls.push(ball);
}
}
}
}
function getCurShowTime(){
var date = new Date();
var ret = date.getHours()*3600 + date.getMinutes()*60 + date.getSeconds();
return ret;
}
function render(cxt){
var hour = parseInt(curShowTime/3600);
var min = parseInt((curShowTime - hour*3600)/60);
var sec = parseInt(curShowTime%60);
cxt.clearRect(0,0,CVS_WIDTH,CVS_HEIGHT);
renderDigit(cxt,PADDINGLEFT,MARGIN_TOP,parseInt(hour/10));
renderDigit(cxt,PADDINGLEFT+15*(RADIUS+1),MARGIN_TOP,parseInt(hour%10));
renderDigit(cxt,PADDINGLEFT+31*(RADIUS+1),MARGIN_TOP,10);
renderDigit(cxt,PADDINGLEFT+40*(RADIUS+1),MARGIN_TOP,parseInt(min/10));
renderDigit(cxt,PADDINGLEFT+55*(RADIUS+1),MARGIN_TOP,parseInt(min%10));
renderDigit(cxt,PADDINGLEFT+70*(RADIUS+1),MARGIN_TOP,10);
renderDigit(cxt,PADDINGLEFT+79*(RADIUS+1),MARGIN_TOP,parseInt(sec/10));
renderDigit(cxt,PADDINGLEFT+94*(RADIUS+1),MARGIN_TOP,parseInt(sec%10));
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);
cxt.closePath();
cxt.fill();
}
}
function renderDigit(cxt,x,y,num){
cxt.fillStyle = color;
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();
}
}
}
}
}
实例出处：慕课网http://www.imooc.com/，喜欢的朋友可以到慕课网搜索学习哦~
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