在本文中,将探讨如何利用Raspberry Pi来动态显示图片、天气、时间和日期信息。这是一个非常实用的项目,可以用于家庭、办公室或任何需要显示这些信息的地方。
以下是用于显示图片、天气、时间和日期信息的HTML代码:
<div class="container" style="overflow: hidden;">
<div class="event">
<h1 style="margin-bottom: 5px; font-family:Alegreya Sans;text-align: center;">
<span style="padding-left:15px;" id="dateHead"></span>
</h1>
<h1 style="margin-bottom: 5px;font-family:Alegreya Sans;">
<span style="padding-left:15px;" id="weatherHead"></span>
</h1>
<h4 style="margin-top: 5px;font-family:Alegreya Sans;">
<span style="padding-left:15px;font-size:18px;" id="weatherBody"></span>
</h4>
<h1 style="margin-bottom:5px;font-family:Alegreya Sans;text-align: center;">
<span id="timeHead"></span>
</h1>
</div>
<canvas id="photoGallery" style="background-color :black;top: 0px;left: 0px;">
Your browser does not support the HTML5 canvas tag.
</canvas>
</div>
HTML中的<canvas>
元素用于通过JavaScript绘制图形。以下是加载图片到canvas的JavaScript代码:
var imgIndex = 0;
var photoTimer = 10000;
var weatherTimer = 1000 * 60 * 60;
var clockTimer = 1000;
var canvas = document.getElementById('photoGallery');
var context = canvas.getContext('2d');
var img = new Image();
img.src = images[imgIndex];
img.onload = function() {
var width = window.innerWidth;
var height = window.innerHeight;
context.canvas.width = width;
context.canvas.height = height;
context.drawImage(img, 0, 0, width, height);
};
setClock();
setInterval(loadPhoto, photoTimer);
setInterval(getWeather, weatherTimer);
setInterval(setClock, clockTimer);
function loadPhoto() {
imgIndex = imgIndex >= images.length ? 0 : ++imgIndex;
img.src = images[imgIndex];
}
function setClock() {
var d = new Date();
$("#dateHead").html(d.toDateString());
$("#timeHead").html(d.toLocaleTimeString());
}
function getWeather() {
$.simpleWeather({
location: 'Burlington,CA',
woeid: '',
unit: 'c',
success: function(weather) {
var html = weather.city + ', ' + weather.region + ' ' + weather.temp + '°' + weather.units.temp;
$("#weatherHead").html(html);
html = 'Feel like ' + eval(weather.wind.chill + weather.temp) + '°' + ' ' + weather.currently + ' ' + weather.wind.direction + ' ' + weather.wind.speed + ' ' + weather.units.speed;
$("#weatherBody").html(html);
},
error: function(error) {
$(".weather").html('' + error + '
');
}
});
$(function() {
getWeather();
});
}
上述代码片段使用了jQuery simpleweather插件来显示给定位置的天气信息。目前,正在从Flickr显示图片,但Google照片、日历或Flickr API可以集成,这将在下一篇文章中介绍。此外,使用了天气位置'Burlington,CA',这可以通过HTML5 Geolocation API获取。
Raspberry Pi的设置已经在文章中有介绍。接下来,将在Raspberry Pi上安装NGINX Web服务器。首先,通过在终端输入以下命令安装nginx包:
sudo apt-get install nginx
然后,可以使用FTP或终端替换nginx的默认页面。
sudo nano /var/www/html/index.nginx-debian.html
使用以下命令启动服务器:
sudo /etc/init.d/nginx start