[js高手之路] html5 canvas教程 - 制作一个数码倒计时效果
效果图：
这个实例主要注意:
1，剩余时间的计算
2，每个时间数字的绘制
时间主要有0-9和一个冒号组成，用数组来表示( 0: 就是不画圆，1：就是画一个蓝色的圆 )
num.js文件：
var digital =
[
[
[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]
]//:
];
倒计时实现：
<head>
<meta charset='utf-8' />
<style>
#canvas {
border: 1px dashed #aaa;
}
</style>
<script src="./num.js"></script>
<script>
window.onload = function () {
var oCanvas = document.querySelector("#canvas"),
oGc = oCanvas.getContext('2d'),
width = oCanvas.width, height = oCanvas.height,
radius = 10,
leftTime = 0,
endTime = new Date( 2017, 09, 10, 15, 30, 02 ); leftTime = getLeftTime();
showTime( oGc );
setInterval(function(){
oGc.clearRect( 0, 0, width, height );
leftTime = getLeftTime();
showTime( oGc );
}, 1000); function showTime( cxt ){
var hour = parseInt( leftTime / 3600 );
var min = parseInt( ( leftTime - hour * 3600 ) / 60 );
var sec = leftTime % 60; showNum( 0, 0, parseInt( hour / 10 ), cxt );
showNum( 15 * ( radius + 1 ), 0, parseInt( hour % 10 ), cxt );
showNum( 30 * ( radius + 1 ), 0, 10, cxt );
showNum( 39 * ( radius + 1 ), 0, parseInt( min / 10 ), cxt );
showNum( 54 * ( radius + 1 ), 0, parseInt( min % 10 ), cxt );
showNum( 69 * ( radius + 1 ), 0, 10, cxt );
showNum( 78 * ( radius + 1 ), 0, parseInt( sec / 10 ), cxt );
showNum( 93 * ( radius + 1 ), 0, parseInt( sec % 10 ), cxt );
} function getLeftTime(){
var curTime = new Date();
var restTime = endTime.getTime() - curTime.getTime();
restTime = Math.round( restTime / 1000 );
return restTime > 0 ? restTime : 0;
} //显示时间的每一位
function showNum( x, y, num, cxt ){
cxt.fillStyle = '#09f';
for( var i = 0; i < digital[num].length; i++ ){
for( var j = 0; j < digital[num][i].length; j++ ){
if ( digital[num][i][j] == 1 ){
cxt.beginPath();
cxt.arc( x + j * 2 * ( radius + 1 ) + ( radius + 1 ), y + i * 2 * ( radius + 1 ) + ( radius + 1 ), radius, 0, + 360 * Math.PI / 180, false );
cxt.closePath();
cxt.fill();
}
}
}
}
}
</script>
</head>
<body>
<canvas id="canvas" width="1200" height="300"></canvas>
</body>
<meta charset='utf-8' />
<style>
#canvas {
border: 1px dashed #aaa;
}
</style>
<script>
var digital =
[
[
[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
[
[0,0,0,1,1,0,0],
[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]
],//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]
],//2
[
[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]
],//3
[
[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]
],//4
[
[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]
],//5
[
[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]
],//6
[
[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]
],//7
[
[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]
],//8
[
[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]
],//9
[
[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]
]//:
];
</script>
<script>
window.onload = function () {
var oCanvas = document.querySelector("#canvas"),
oGc = oCanvas.getContext('2d'),
width = oCanvas.width, height = oCanvas.height,
radius = 10,
leftTime = 0,
endTime = new Date( 2017, 09, 10, 15, 30, 02 );
leftTime = getLeftTime();
showTime( oGc );
setInterval(function(){
oGc.clearRect( 0, 0, width, height );
leftTime = getLeftTime();
showTime( oGc );
}, 1000);
function showTime( cxt ){
var hour = parseInt( leftTime / 3600 );
var min = parseInt( ( leftTime - hour * 3600 ) / 60 );
var sec = leftTime % 60;
showNum( 0, 0, parseInt( hour / 10 ), cxt );
showNum( 15 * ( radius + 1 ), 0, parseInt( hour % 10 ), cxt );
showNum( 30 * ( radius + 1 ), 0, 10, cxt );
showNum( 39 * ( radius + 1 ), 0, parseInt( min / 10 ), cxt );
showNum( 54 * ( radius + 1 ), 0, parseInt( min % 10 ), cxt );
showNum( 69 * ( radius + 1 ), 0, 10, cxt );
showNum( 78 * ( radius + 1 ), 0, parseInt( sec / 10 ), cxt );
showNum( 93 * ( radius + 1 ), 0, parseInt( sec % 10 ), cxt );
}
function getLeftTime(){
var curTime = new Date();
var restTime = endTime.getTime() - curTime.getTime();
restTime = Math.round( restTime / 1000 );
return restTime > 0 ? restTime : 0;
}
//显示时间的每一位
function showNum( x, y, num, cxt ){
cxt.fillStyle = '#09f';
for( var i = 0; i < digital[num].length; i++ ){
for( var j = 0; j < digital[num][i].length; j++ ){
if ( digital[num][i][j] == 1 ){
cxt.beginPath();
cxt.arc( x + j * 2 * ( radius + 1 ) + ( radius + 1 ), y + i * 2 * ( radius + 1 ) + ( radius + 1 ), radius, 0, + 360 * Math.PI / 180, false );
cxt.closePath();
cxt.fill();
}
}
}
}
}
</script>
</head>
<body>
<canvas id="canvas" width="1200" height="300"></canvas>
</body>
run code
[js高手之路] html5 canvas教程 - 制作一个数码倒计时效果的更多相关文章
- [js高手之路] html5 canvas教程 - 绘制七巧板
七巧板长什么样? 用canvas把他画出来,其实就是把这7个区域的图形,每个点的坐标找出来,再用moveTo, lineTo连线,设置不同的颜色即可. <head> <meta ch ...
- [js高手之路]html5 canvas教程 - 1px问题以及绘制坐标系网格
在canvas中,要画出1px的线条,默认情况下是不行的 context.beginPath(); context.moveTo( 100, 100 ); context.lineTo( 400, 1 ...
- [js高手之路] html5 canvas系列教程 - 掌握画直线图形的常用API
我们接着上文[js高手之路] html5 canvase系列教程 - 认识canvas以及基本使用方法继续. 一.直线的绘制 cxt.moveTo( x1, y1 ): 将画笔移动到x1, y1这个点 ...
- [js高手之路] html5 canvas系列教程 - arcTo(弧度与二次,三次贝塞尔曲线以及在线工具)
之前,我写了一个arc函数的用法:[js高手之路] html5 canvas系列教程 - arc绘制曲线图形(曲线,弧线,圆形). arcTo: cxt.arcTo( cx, cy, x2, y2, ...
- [js高手之路] html5 canvas系列教程 - arc绘制曲线图形(曲线，弧线，圆形)
绘制曲线,经常会用到路径的知识,如果你对路径有疑问,可以参考我的这篇文章[js高手之路] html5 canvas系列教程 - 开始路径beginPath与关闭路径closePath详解. arc:画 ...
- [js高手之路] html5 canvas系列教程 - 图片操作(drawImage,clip,createPattern)
接着上文[js高手之路] html5 canvas系列教程 - 文本样式(strokeText,fillText,measureText,textAlign,textBaseline)继续,本文介绍的 ...
- [js高手之路] html5 canvas系列教程 - 文本样式(strokeText,fillText,measureText,textAlign,textBaseline)
接着上文线条样式[js高手之路] html5 canvas系列教程 - 线条样式(lineWidth,lineCap,lineJoin,setLineDash)继续. canvas提供两种输出文本的方 ...
- [js高手之路] html5 canvas系列教程 - 线条样式(lineWidth,lineCap,lineJoin,setLineDash)
上文,写完弧度与贝塞尔曲线[js高手之路] html5 canvas系列教程 - arcTo(弧度与二次,三次贝塞尔曲线以及在线工具),本文主要是关于线条的样式设置 lineWidth: 设置线条的宽 ...
- [js高手之路] html5 canvas系列教程 - 像素操作(反色,黑白,亮度,复古,蒙版,透明)
接着上文[js高手之路] html5 canvas系列教程 - 状态详解(save与restore),相信大家都应该玩过美颜功能,而我们今天要讲的就是canvas强大的像素处理能力,通过像素处理,实现 ...
随机推荐
- CSS3 box-shadow 内外阴影效果
说明 box-shadow 属性可以给元素边框周围添加一个或者多个阴影效果.定义多个阴影,使用逗号分隔. 语法 box-shadow: none | [inset? && [<o ...
- c++用类写栈和队列的简单基本操作（实验）
继续更文.这次用类来写栈和队列,都是用数组模拟的: 以下是栈和队列的定义: 然后分别是栈和队列的类: 完整代码贴上: 栈 //使用类来定义栈 class ZHAN { public: STACK s; ...
- tcpdum使用详解
http://starsliao.blog.163.com/blog/static/89048201062333032563/ TCPdump抓包命令 tcpdump是一个用于截取网络分组,并输出 ...
- So, you think you know JavaScript?
Baranovskiy 参考:http://dmitry.baranovskiy.com/post/91403200 题目一: if (!("a" in window)) ...
- UGUI表情系统&超链接解决方案
最近帮一个同事解决图文混排的问题,发现了一种犀利的UGUI表情系统的解决方案 https://blog.uwa4d.com/archives/Sparkle_UGUI.html 使用重新生成UGUI文 ...
- linux kvm虚拟机使用
安装配置kvm 1.安装kvm软件包 [root@kvm ~]# yum install kvm python-virtinst libvirt tunctl bridge-utils virt-ma ...
- Android之本地相冊图片选取和拍照以及图片剪辑
转载请注明出处:http://blog.csdn.net/loveyaozu/article/details/51160482 相信有非常多Android开发者在日常开发中,因为项目需求,须要我们的A ...
- 基于.NET的弹性及瞬间错误处理库Polly
本文基本是官方说明的翻译和总结(https://github.com/App-vNext/Polly) 什么是Polly? Polly是一款基于.NET的弹性及瞬间错误处理库, 它允许开发人员以顺畅及 ...
- 将java项目打包为jar
打开Eclipse,点击file,选择export 选择java,选择其中的JAR file并点击next 选择需要的到处的项目,并在下方输入将项目保存为的目录,文件名字. 如果,已经将项目打包为一个 ...
- 【maven教程】(1)---maven环境配置
maven环境配置 刚开始学习maven,现在项目需要用到maven,而且他确实很好用,也比较容易上手,我也是主要通过视频学习,在写博客的时候也会总结其它人所写 博客,从简到难,如果你也是初学者那接下 ...