Canvas就像一块画布，我们可以通过调用脚本在Canvas上绘制任意形状，甚至是制作动画。本文就是收集了很多非常富有创意的一些canvas动画特效例子，这些例子都非常适合大家学习。
1.3D篝火动画特效
这款篝火特效是基于 three.js 和 canvas 制作的3D动画特效 跟我们平常野外生火烤火很像 鼠标滚轮滚动还可以放大缩小篝火
2.淋雨闪电特效
基于canvas的淋雨特效 和 闪电特效
<body>
<title>Raining with Thunder</title>
<canvas id="canvas" width="1280" height="720"
style="height: 362px; width: 643px; margin-left: 52px; margin-top: 0px;"></canvas>
<script id="rendered-js">
var canvas = document.getElementById('canvas');
var ctx = canvas.getContext('2d');
var stgw = 1280;
var stgh = 720;
var loffset = 0;
var toffset = 0;
function _pexresize() {
var cw = window.innerWidth;
var ch = window.innerHeight;
if (cw <= ch * stgw / stgh) {
loffset = 0;
toffset = Math.floor(ch - cw * stgh / stgw) / 2;
canvas.style.width = cw + "px";
canvas.style.height = Math.floor(cw * stgh / stgw) + "px";
} else {
loffset = Math.floor(cw - ch * stgw / stgh) / 2;
toffset = 0;
canvas.style.height = ch + "px";
canvas.style.width = Math.floor(ch * stgw / stgh) + "px";
}
canvas.style.marginLeft = loffset + "px";
canvas.style.marginTop = toffset + "px";
}
_pexresize();
var count = 100;
var lcount = 6;
var layer = [];
var layery = [];
ctx.fillStyle = "rgba(255,255,255,0.5)";
for (var l = 0; l < lcount; l++) {
ctx.clearRect(0, 0, stgw, stgh);
for (var i = 0; i < count * (lcount - l) / 1.5; i++) {
var myx = Math.floor(Math.random() * stgw);
var myy = Math.floor(Math.random() * stgh);
var myh = l * 6 + 8;
var myw = myh / 10;
ctx.beginPath();
ctx.moveTo(myx, myy);
ctx.lineTo(myx + myw, myy + myh);
ctx.arc(myx, myy + myh, myw, 0, 1 * Math.PI);
ctx.lineTo(myx - myw, myy + myh);
ctx.closePath();
ctx.fill();
}
layer[l] = new Image();
layer[l].src = canvas.toDataURL("image/png");
layery[l] = 0;
}
var stt = 0;
var str = Date.now() + Math.random() * 4000;
var stact = false;
function animate() {
ctx.clearRect(0, 0, stgw, stgh);
for (var l = 0; l < lcount; l++) {
layery[l] += (l + 1.5) * 5;
if (layery[l] > stgh) {
layery[l] = layery[l] - stgh;
}
ctx.drawImage(layer[l], 0, layery[l]);
ctx.drawImage(layer[l], 0, layery[l] - stgh);
}
if (Date.now() > str) {
stact = true;
}
if (stact) {
stt++;
if (stt < 5 + Math.random() * 10) {
var ex = stt / 30;
} else {
var ex = (stt - 10) / 30;
}
if (stt > 20) {
stt = 0;
stact = false;
str = Date.now() + Math.random() * 8000 + 2000;
}
ctx.fillStyle = "rgba(255,255,255," + ex + ")";
ctx.fillRect(0, 0, stgw, stgh);
}
window.requestAnimationFrame(animate);
}
animate();
</script>
</body>
3.精美表单切换模板
Html5 流畅的切换登录注册表单 且带有特效
<body>
<div class="container right-panel-active">
<!-- Sign Up -->
<div class="container__form container--signup">
<form action="#" class="form" id="form1">
<h2 class="form__title">Sign Up</h2>
<input type="text" placeholder="User" class="input" />
<input type="email" placeholder="Email" class="input" />
<input type="password" placeholder="Password" class="input" />
<button class="btn">Sign Up</button>
</form>
</div>
<!-- Sign In -->
<div class="container__form container--signin">
<form action="#" class="form" id="form2">
<h2 class="form__title">Sign In</h2>
<input type="email" placeholder="Email" class="input" />
<input type="password" placeholder="Password" class="input" />
<a href="#" class="link">Forgot your password?</a>
<button class="btn">Sign In</button>
</form>
</div>
<!-- Overlay -->
<div class="container__overlay">
<div class="overlay">
<div class="overlay__panel overlay--left">
<button class="btn" id="signIn">Sign In</button>
</div>
<div class="overlay__panel overlay--right">
<button class="btn" id="signUp">Sign Up</button>
</div>
</div>
</div>
</div>
<!-- partial -->
<script src="./js/script.js"></script>
</body>
4.新年倒计时
马上临近圣诞和元旦了 还没有圣诞树的朋友可以查看 圣诞合集 下面是有关元旦倒计时的特效效果图
5.粒子文字特效
可自己修改默认的文字 同时还支持手动输入文字
6.时间动画特效
这是一款基于canvas的时间显示特效 每秒都有粒子掉落显示的动画 还是非常精美的 也适合部署在自己的网站内
7.粒子倒计时
粒子聚合组成的一个个数字的切换 也是很巧妙的 适合学习和作为课后练习使用
<body>
<script src="js/TweenMax.min.js"></script>
<canvas id="canvas-number"></canvas>
<canvas id="canvas-dots"></canvas>
<script src="js/script.js"></script>
</body>
8.烟雾文字消散特效
这是一款 跟蒸汽一样 慢慢的扩散消逝掉 不会像火焰一样只存在瞬间的美
<body>
<canvas id="myCanvas"></canvas>
<div class="text">
<span>S</span>
<span>m</span>
<span>o</span>
<span>k</span>
<span>e</span>
<span> </span>
<span>烟</span>
<span>雾</span>
<span>消</span>
<span>散</span>
</div>
<script type="text/javascript" src='js/three.min.js'></script>
<script type="text/javascript" src='js/Stats.js'></script>
<script type="text/javascript" src="js/script.js"></script>
</body>
