实现功能的js代码
var CHANCE_SPEC, x, y;
CHANCE_SPEC = 60;
x = 0;
y = 0;
function rand(min, max) {
return Math.floor(Math.random() * (max - min + 1) - min);
}
function drawSpec(data, x, y, w) {
var index;
index = (x + y * w) * 4;
data.data[index + 0] = 0;
data.data[index + 1] = 0;
data.data[index + 2] = 0;
data.data[index + 3] = 30;
}
function drawPattern(canvas, ctx, data) {
var w, h;
w = canvas.width;
h = canvas.height;
while (x < w) {
if (rand(1, 100) < CHANCE_SPEC) {
drawSpec(data, x, y, w);
}
x++;
}
if (x === w) {
x = 0;
y++;
}
if (y === h) {
ctx.putImageData(data, 0, 0);
return;
}
drawPattern(canvas, ctx, data);
}
function main() {
var canvas, ctx, data;
console.log('starting1');
canvas = document.getElementById('my-canvas');
ctx = canvas.getContext('2d');
data = ctx.getImageData(0, 0, canvas.width, canvas.height);
drawPattern(canvas, ctx, data);
updateTime();
}
function updateTime() {
var currentTime, seconds, minutes, hours, times, i;
currentTime = new Date();
times = {
'second': currentTime.getSeconds(),
'minute': currentTime.getMinutes(),
'hour': currentTime.getHours()
};
for (type in times) {
if (times.hasOwnProperty(type)) {
setTimes(type, timeToString(times[type]));
}
}
setTimeout(updateTime, 1000);
}
function timeToString(currentTime) {
var t;
t = currentTime.toString();
if (t.length === 1) {
return '0' + t;
}
return t;
}
function getPreviousTime(type) {
return $('#' + type + '-top').text();
}
function setTimes(type, timeStr) {
setTime(getPreviousTime(type + '-tens'), timeStr[0], type + '-tens');
setTime(getPreviousTime(type + '-ones'), timeStr[1], type + '-ones');
}
function setTime(previousTime, newTime, type) {
if (previousTime === newTime) {
return;
}
setTimeout(function() {
$('#' + type + '-top').text(newTime);
},
150);
setTimeout(function() {
$('.bottom-container', $('#' + type + '-bottom')).text(newTime);
},
365);
animateTime(previousTime, newTime, type);
}
function animateTime(previousTime, newTime, type) {
var top, bottom;
top = $('#top-' + type + '-anim');
bottom = $('#bottom-' + type + '-anim');
$('.top-half-num', top).text(previousTime);
$('.dropper', bottom).text(newTime);
top.show();
bottom.show();
$('#top-' + type + '-anim').css('visibility', 'visible');
$('#bottom-' + type + '-anim').css('visibility', 'visible');
animateNumSwap(type);
setTimeout(function() {
hideNumSwap(type);
},
365);
}
function animateNumSwap(type) {
$('#top-' + type + '-anim').toggleClass('up');
$('#bottom-' + type + '-anim').toggleClass('down');
}
function hideNumSwap(type) {
$('#top-' + type + '-anim').toggleClass('up');
$('#bottom-' + type + '-anim').toggleClass('down');
$('#top-' + type + '-anim').css('visibility', 'hidden');
$('#bottom-' + type + '-anim').css('visibility', 'hidden');
}
$(document).ready(main);
window.requestAnimFrame = (function(callback) {
return window.requestAnimationFrame || window.webkitRequestAnimationFrame || window.mozRequestAnimationFrame || window.oRequestAnimationFrame || window.msRequestAnimationFrame ||
function(callback) {
window.setTimeout(callback, 1000 / 60);
}
})();