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lt;!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
<HEAD>
<TITLE> New Document </TITLE>
<META NAME="Generator" CONTENT="EditPlus">
<META NAME="Author" CONTENT="">
<META NAME="Keywords" CONTENT="">
<META NAME="Description" CONTENT="">
<style>
html, body {
height: 100%;
padding: 0;
margin: 0;
background: #000;
}
canvas {
position: absolute;
width: 100%;
height: 100%;
}
</style>
</HEAD>
<BODY>
</style>
<canvas id="pinkboard"></canvas>
<script>
/*
* Settings
*/
var settings = {
particles: {
length: 500, // maximum amount of particles
duration: 2, // particle duration in sec
velocity: 100, // particle velocity in pixels/sec
effect: -0.75, // play with this for a nice effect
size: 30, // particle size in pixels
},
};
/*
* RequestAnimationFrame polyfill by Erik M?ller
*/
(function(){var b=0;var c=["ms","moz","webkit","o"];for(var a=0;a<c.length&&!window.requestAnimationFrame;++a){window.requestAnimationFrame=window[c[a]+"RequestAnimationFrame"];window.cancelAnimationFrame=window[c[a]+"CancelAnimationFrame"]||window[c[a]+"CancelRequestAnimationFrame"]}if(!window.requestAnimationFrame){window.requestAnimationFrame=function(h,e){var d=new Date().getTime();var f=Math.max(0,16-(d-b));var g=window.setTimeout(function(){h(d+f)},f);b=d+f;return g}}if(!window.cancelAnimationFrame){window.cancelAnimationFrame=function(d){clearTimeout(d)}}}());
/*
* Point class
*/
var Point = (function() {
function Point(x, y) {
this.x = (typeof x !== 'undefined') ? x : 0;
this.y = (typeof y !== 'undefined') ? y : 0;
}
Point.prototype.clone = function() {
return new Point(this.x, this.y);
};
Point.prototype.length = function(length) {
if (typeof length == 'undefined')
return Math.sqrt(this.x * this.x + this.y * this.y);
this.normalize();
this.x *= length;
this.y *= length;
return this;
};
Point.prototype.normalize = function() {
var length = this.length();
this.x /= length;
this.y /= length;
return this;
};
return Point;
})();
/*
* Particle class
*/
var Particle = (function() {
function Particle() {
this.position = new Point();
this.velocity = new Point();
this.acceleration = new Point();
this.age = 0;
}
Particle.prototype.initialize = function(x, y, dx, dy) {
this.position.x = x;
this.position.y = y;
this.velocity.x = dx;
this.velocity.y = dy;
this.acceleration.x = dx * settings.particles.effect;
this.acceleration.y = dy * settings.particles.effect;
this.age = 0;
};
Particle.prototype.update = function(deltaTime) {
this.position.x += this.velocity.x * deltaTime;
this.position.y += this.velocity.y * deltaTime;
this.velocity.x += this.acceleration.x * deltaTime;
this.velocity.y += this.acceleration.y * deltaTime;
this.age += deltaTime;
};
Particle.prototype.draw = function(context, image) {
function ease(t) {
return (--t) * t * t + 1;
}
var size = image.width * ease(this.age / settings.particles.duration);
context.globalAlpha = 1 - this.age / settings.particles.duration;
context.drawImage(image, this.position.x - size / 2, this.position.y - size / 2, size, size);
};
return Particle;
})();
/*
* ParticlePool class
*/
var ParticlePool = (function() {
var particles,
firstActive = 0,
firstFree = 0,
duration = settings.particles.duration;
function ParticlePool(length) {
// create and populate particle pool
particles = new Array(length);
for (var i = 0; i < particles.length; i++)
particles[i] = new Particle();
}
ParticlePool.prototype.add = function(x, y, dx, dy) {
particles[firstFree].initialize(x, y, dx, dy);
// handle circular queue
firstFree++;
if (firstFree == particles.length) firstFree = 0;
if (firstActive == firstFree ) firstActive++;
if (firstActive == particles.length) firstActive = 0;
};
ParticlePool.prototype.update = function(deltaTime) {
var i;
// update active particles
if (firstActive < firstFree) {
for (i = firstActive; i < firstFree; i++)
particles[i].update(deltaTime);
}
if (firstFree < firstActive) {
for (i = firstActive; i < particles.length; i++)
particles[i].update(deltaTime);
for (i = 0; i < firstFree; i++)
particles[i].update(deltaTime);
}
// remove inactive particles
while (particles[firstActive].age >= duration && firstActive != firstFree) {
firstActive++;
if (firstActive == particles.length) firstActive = 0;
}
};
ParticlePool.prototype.draw = function(context, image) {
// draw active particles
if (firstActive < firstFree) {
for (i = firstActive; i < firstFree; i++)
particles[i].draw(context, image);
}
if (firstFree < firstActive) {
for (i = firstActive; i < particles.length; i++)
particles[i].draw(context, image);
for (i = 0; i < firstFree; i++)
particles[i].draw(context, image);
}
};
return ParticlePool;
})();
/*
* Putting it all together
*/
(function(canvas) {
var context = canvas.getContext('2d'),
particles = new ParticlePool(settings.particles.length),
particleRate = settings.particles.length / settings.particles.duration, // particles/sec
time;
// get point on heart with -PI <= t <= PI
function pointOnHeart(t) {
return new Point(
160 * Math.pow(Math.sin(t), 3),
130 * Math.cos(t) - 50 * Math.cos(2 * t) - 20 * Math.cos(3 * t) - 10 * Math.cos(4 * t) + 25
);
}
// creating the particle image using a dummy canvas
var image = (function() {
var canvas = document.createElement('canvas'),
context = canvas.getContext('2d');
canvas.width = settings.particles.size;
canvas.height = settings.particles.size;
// helper function to create the path
function to(t) {
var point = pointOnHeart(t);
point.x = settings.particles.size / 2 + point.x * settings.particles.size / 350;
point.y = settings.particles.size / 2 - point.y * settings.particles.size / 350;
return point;
}
// create the path
context.beginPath();
var t = -Math.PI;
var point = to(t);
context.moveTo(point.x, point.y);
while (t < Math.PI) {
t += 0.01; // baby steps!
point = to(t);
context.lineTo(point.x, point.y);
}
context.closePath();
// create the fill
context.fillStyle = '#ea80b0';
context.fill();
// create the image
var image = new Image();
image.src = canvas.toDataURL();
return image;
})();
// render that thing!
function render() {
// next animation frame
requestAnimationFrame(render);
// update time
var newTime = new Date().getTime() / 1000,
deltaTime = newTime - (time || newTime);
time = newTime;
// clear canvas
context.clearRect(0, 0, canvas.width, canvas.height);
// create new particles
var amount = particleRate * deltaTime;
for (var i = 0; i < amount; i++) {
var pos = pointOnHeart(Math.PI - 2 * Math.PI * Math.random());
var dir = pos.clone().length(settings.particles.velocity);
particles.add(canvas.width / 2 + pos.x, canvas.height / 2 - pos.y, dir.x, -dir.y);
}
// update and draw particles
particles.update(deltaTime);
particles.draw(context, image);
}
// handle (re-)sizing of the canvas
function onResize() {
canvas.width = canvas.clientWidth;
canvas.height = canvas.clientHeight;
}
window.onresize = onResize;
// delay rendering bootstrap
setTimeout(function() {
onResize();
render();
}, 10);
})(document.getElementById('pinkboard'));
</script>
</BODY>
</HTML>
說程序員是大大的直男，但是一旦程序員浪漫起來，他們會用他們狂拽酷炫吊的技能展現自己的羅曼蒂克實力，那時候就真的沒文科男什么事啦！下面我就跟大家分享如何用簡單的html制作一個網頁版的愛心表白，不管你是不是程序員都能用，手機就可展示。
先來看下效果：
后面會提供給大家源代碼，在這里先交大家怎么去根據自己的實際情況去改這個文件。
首先大家將我后面的源代碼復制下來并且粘貼進一個txt文件就可以。
不要看到下載就害怕，這個大家只要搜索jquery就能下載了，下載完是一個jquery.js文件，將文件改名為jquery.txt，雙擊打開將內容復制到下圖所示位置。（如果有人不會下，可以私信我索要）
大家根據自己的實際請款更改頁面的一些信息，比如姓名，日期、或者是表白內容都可以
最后奉上源碼，這里是沒有jquery.js的，已經預留空，需要大家復制粘貼進來就行了，最后將txt文件的后綴改為.html就可以了，不管是電腦還是手機都能用哦。
天雷雨交加，燥熱有所緩解。今晨空氣清新，再加上馬上三天小長假，心情很不錯，祝各位小長假玩的開心。那么，今天就用CSS3做些“不正緊”的事：畫八卦和愛心。
CSS3我們一般都是用來進行布局，在工作中很少會刻意去用它畫畫，畢竟這有點耗時間。
css3繪制八卦
分析：它就是多個圓疊加的效果。
1、給body加個背景色，否則看不清八卦的白色部分：
body{background:#efefef;}
2、畫一個圓，漸變是由白到黑的激烈漸變：
.wrap{width: 300px;
height: 300px;
background: linear-gradient(to right,#fff 50%,#000 50%);
border-radius: 50%
}
<div class="wrap"></div>
效果圖如下：
css3繪制八卦
3、在上下各畫一黑一白兩個圓，圓的直徑剛好是剛才大圓的半徑，同時水平居中，然后讓它倆里面的內容水平和垂直居中（方便畫里面更小的圓）：
.inner{
width: 150px;
height:150px;
border-radius: 50%;
margin: auto
}
.white{
background-color: #fff;
}
.black{
background-color:#000;
}
<div class="wrap">
<div class="inner white"></div>
<div class="inner black"></div>
</div>
效果圖如下：
css3繪制八卦
4、利用剛才的兩個圓的 after 偽元素，各畫一個更小的圓，背景色和這兩個大圓正好相反，這樣就畫好了，最終代碼如下：
<style type="text/css">
body{background:#efefef;}
.wrap{
width: 300px;
height: 300px;
background: linear-gradient(to right,#fff 50%,#000 50%);
border-radius: 50%;
}
.inner{
width: 150px;
height:150px;
border-radius: 50%;
margin: auto;
display: flex;
justify-content: center;
align-items: center;
}
.inner:after{
content:'';
width: 50px;
height: 50px;
border-radius: 50%
}
.white{
background-color: #fff;
}
.white:after{
background-color: #000;
}
.black{
background-color:#000;
}
.black:after{
background-color:#fff;
}
</style>
<div class="wrap">
<div class="inner white"></div>
<div class="inner black"></div>
</div>
最終八卦的效果圖：
分析：愛心其實就是兩個圓+一個旋轉45°的正方形。
1、先定義一個紅色旋轉45°的外框，同時相對定位，方便圓的各個組成部分定位：
<style type="text/css">
.heart{
position: relative;
background: red;
width: 300px;
height: 300px;
transform:rotate(45deg);
}
</style>
<div class="heart"></div>
2、利用heart的before和after偽元素，在它的左右各加一個直徑和它寬度一樣的圓，同時調整兩個圓和heart的邊相切，最終代碼：
<style type="text/css">
.heart{
position: relative;
background: red;
width: 300px;
height: 300px;
transform:rotate(45deg);
margin:auto;
top:100px;
}
.heart:before,.heart:after{
content: '';
position: absolute;
top: 0;
left: -150px;
width: 300px;
height: 300px;
border-radius: 50%;
background: red;
}
.heart:after{
top: -150px;
left: 0;
}
</style>
<div class="heart"></div>
最終效果圖：
CSS畫圖雖然比直接切成圖片引用要耗時間，但是也有很多好處，例如減少請求次數、顯示速度快，減少網頁大小等，并且畫出來的圖都是矢量的。簡單的圖，用CSS畫還是比較劃算的。
當然，不建議復雜的圖用CSS畫，耗時耗力，兼容性還差。
上面的圖都非常簡單，如果用上陰影（CSS3的陰影非常強大）、漸變，效果會更好，畫面會更加豐滿，立體感更強。嘗試下下面的圖用CSS畫出來：
關注IT學堂，下次我們來畫下上面的LOGO吧。
*請認真填寫需求信息，我們會在24小時內與您取得聯系。
