一, 彩带
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>
</body>
<script async="" type="text/javascript">
(function (name, factory) {
if (typeof window === "object") {
window[name] = factory();
}
})("Ribbons", function () {
var _w = window, _b = document.body, _d = document.documentElement;
var random = function () {
if (arguments.length === 1) {
if (Array.isArray(arguments[0])) {
var index = Math.round(random(0, arguments[0].length - 1));
return arguments[0][index];
}
return random(0, arguments[0]);
} else if (arguments.length === 2) {
return Math.random() * (arguments[1] - arguments[0]) + arguments[0];
}
return 0;
};
var screenInfo = function (e) {
var width = Math.max(0, _w.innerWidth || _d.clientWidth || _b.clientWidth || 0),
height = Math.max(0, _w.innerHeight || _d.clientHeight || _b.clientHeight || 0),
scrollx = Math.max(0, _w.pageXOffset || _d.scrollLeft || _b.scrollLeft || 0) - (_d.clientLeft || 0),
scrolly = Math.max(0, _w.pageYOffset || _d.scrollTop || _b.scrollTop || 0) - (_d.clientTop || 0);
return {
width,
height: height,
ratio: width / height,
centerx: width / 2,
centery: height / 2,
scrollx: scrollx,
scrolly: scrolly
};
};
var mouseInfo = function (e) {
var screen = screenInfo(e), mousex = e ? Math.max(0, e.pageX || e.clientX || 0) : 0,
mousey = e ? Math.max(0, e.pageY || e.clientY || 0) : 0;
return {
mousex: mousex,
mousey: mousey,
centerx: mousex - screen.width / 2,
centery: mousey - screen.height / 2
};
};
var Point = function (x, y) {
this.x = 0;
this.y = 0;
this.set(x, y);
};
Point.prototype = {
constructor: Point, set: function (x, y) {
this.x = x || 0;
this.y = y || 0;
}, copy: function (point) {
this.x = point.x || 0;
this.y = point.y || 0;
return this;
}, multiply: function (x, y) {
this.x *= x || 1;
this.y *= y || 1;
return this;
}, divide: function (x, y) {
this.x /= x || 1;
this.y /= y || 1;
return this;
}, add: function (x, y) {
this.x += x || 0;
this.y += y || 0;
return this;
}, subtract: function (x, y) {
this.x -= x || 0;
this.y -= y || 0;
return this;
}, clampX: function (min, max) {
this.x = Math.max(min, Math.min(this.x, max));
return this;
}, clampY: function (min, max) {
this.y = Math.max(min, Math.min(this.y, max));
return this;
}, flipX: function () {
this.x *= -1;
return this;
}, flipY: function () {
this.y *= -1;
return this;
}
};
var Factory = function (options) {
this._canvas = null;
this._context = null;
this._sto = null;
this._width = 0;
this._height = 0;
this._scroll = 0;
this._ribbons = [];
this._options = {
colorSaturation: "80%",
colorBrightness: "60%",
colorAlpha: 0.65,
colorCycleSpeed: 6,
verticalPosition: "center",
horizontalSpeed: 200,
ribbonCount: 4,
strokeSize: 0,
parallaxAmount: -0.5,
animateSections: true
};
this._onDraw = this._onDraw.bind(this);
this._onResize = this._onResize.bind(this);
this._onScroll = this._onScroll.bind(this);
this.setOptions(options);
this.init();
};
Factory.prototype = {
constructor: Factory, setOptions: function (options) {
if (typeof options === "object") {
for (var key in options) {
if (options.hasOwnProperty(key)) {
this._options[key] = options[key];
}
}
}
}, init: function () {
try {
this._canvas = document.createElement("canvas");
this._canvas.style["display"] = "block";
this._canvas.style["position"] = "fixed";
this._canvas.style["margin"] = "0";
this._canvas.style["padding"] = "0";
this._canvas.style["border"] = "0";
this._canvas.style["outline"] = "0";
this._canvas.style["left"] = "0";
this._canvas.style["top"] = "0";
this._canvas.style["width"] = "100%";
this._canvas.style["height"] = "100%";
this._canvas.style["z-index"] = "-1";
this._canvas.style["background-color"] = "#1f1f1f";
this._canvas.id = "bgCanvas";
this._onResize();
this._context = this._canvas.getContext("2d");
this._context.clearRect(0, 0, this._width, this._height);
this._context.globalAlpha = this._options.colorAlpha;
// 这里可以设置是否随着窗口的滚动而滚动
window.addEventListener("resize", this._onResize);
window.addEventListener("scroll", this._onScroll);
// 这里设置添加的位置
var body_ = document.getElementsByTagName('body')[0];
body_.appendChild(this._canvas);
} catch (e) {
console.warn("Canvas Context Error: " + e.toString());
return;
}
this._onDraw();
}, addRibbon: function () {
var dir = Math.round(random(1, 9)) > 5 ? "right" : "left", stop = 1000, hide = 200, min = 0 - hide,
max = this._width + hide, movex = 0, movey = 0, startx = dir === "right" ? min : max,
starty = Math.round(random(0, this._height));
if (/^(top|min)$/i.test(this._options.verticalPosition)) {
starty = 0 + hide;
} else if (/^(middle|center)$/i.test(this._options.verticalPosition)) {
starty = this._height / 2;
} else if (/^(bottom|max)$/i.test(this._options.verticalPosition)) {
starty = this._height - hide;
}
var ribbon = [], point1 = new Point(startx, starty), point2 = new Point(startx, starty), point3 = null,
color = Math.round(random(0, 360)), delay = 0;
while (true) {
if (stop <= 0) break;
stop--;
movex = Math.round((Math.random() * 1 - 0.2) * this._options.horizontalSpeed);
movey = Math.round((Math.random() * 1 - 0.5) * (this._height * 0.25));
point3 = new Point();
point3.copy(point2);
if (dir === "right") {
point3.add(movex, movey);
if (point2.x >= max) break;
} else if (dir === "left") {
point3.subtract(movex, movey);
if (point2.x <= min) break;
}
ribbon.push({
point1: new Point(point1.x, point1.y),
point2: new Point(point2.x, point2.y),
point3: point3,
color: color,
delay: delay,
dir: dir,
alpha: 0,
phase: 0
});
point1.copy(point2);
point2.copy(point3);
delay += 4;
color += this._options.colorCycleSpeed;
}
this._ribbons.push(ribbon);
}, _drawRibbonSection: function (section) {
if (section) {
if (section.phase >= 1 && section.alpha <= 0) {
return true;
}
if (section.delay <= 0) {
section.phase += 0.02;
section.alpha = Math.sin(section.phase) * 1;
section.alpha = section.alpha <= 0 ? 0 : section.alpha;
section.alpha = section.alpha >= 1 ? 1 : section.alpha;
if (this._options.animateSections) {
var mod = Math.sin(1 + section.phase * Math.PI / 2) * 0.1;
if (section.dir === "right") {
section.point1.add(mod, 0);
section.point2.add(mod, 0);
section.point3.add(mod, 0);
} else {
section.point1.subtract(mod, 0);
section.point2.subtract(mod, 0);
section.point3.subtract(mod, 0);
}
section.point1.add(0, mod);
section.point2.add(0, mod);
section.point3.add(0, mod);
}
} else {
section.delay -= 0.5;
}
var s = this._options.colorSaturation, l = this._options.colorBrightness,
c = "hsla(" + section.color + ", " + s + ", " + l + ", " + section.alpha + " )";
this._context.save();
if (this._options.parallaxAmount !== 0) {
this._context.translate(0, this._scroll * this._options.parallaxAmount);
}
this._context.beginPath();
this._context.moveTo(section.point1.x, section.point1.y);
this._context.lineTo(section.point2.x, section.point2.y);
this._context.lineTo(section.point3.x, section.point3.y);
this._context.fillStyle = c;
this._context.fill();
if (this._options.strokeSize > 0) {
this._context.lineWidth = this._options.strokeSize;
this._context.strokeStyle = c;
this._context.lineCap = "round";
this._context.stroke();
}
this._context.restore();
}
return false;
}, _onDraw: function () {
for (var i = 0, t = this._ribbons.length; i < t; ++i) {
if (!this._ribbons[i]) {
this._ribbons.splice(i, 1);
}
}
this._context.clearRect(0, 0, this._width, this._height);
for (var a = 0; a < this._ribbons.length; ++a) {
var ribbon = this._ribbons[a], numSections = ribbon.length, numDone = 0;
for (var b = 0; b < numSections; ++b) {
if (this._drawRibbonSection(ribbon[b])) {
numDone++;
}
}
if (numDone >= numSections) {
this._ribbons[a] = null;
}
}
if (this._ribbons.length < this._options.ribbonCount) {
this.addRibbon();
}
requestAnimationFrame(this._onDraw);
}, _onResize: function (e) {
var screen = screenInfo(e);
this._width = screen.width;
this._height = screen.height;
if (this._canvas) {
this._canvas.width = this._width;
this._canvas.height = this._height;
if (this._context) {
this._context.globalAlpha = this._options.colorAlpha;
}
}
}, _onScroll: function (e) {
var screen = screenInfo(e);
this._scroll = screen.scrolly;
}
};
return Factory;
});
new Ribbons();
</script>
</html>
二, 粒子球
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>
<!--网格动态背景开始-->
<script type="text/javascript">
!function () {
//封装方法，压缩之后减少文件大小
function get_attribute(node, attr, default_value) {
return node.getAttribute(attr) || default_value;
}
//封装方法，压缩之后减少文件大小
function get_by_tagname(name) {
return document.getElementsByTagName(name);
}
//获取配置参数
function get_config_option() {
var scripts = get_by_tagname("script"),
script_len = scripts.length,
script = scripts[script_len - 1]; //当前加载的script
return {
l: script_len, //长度，用于生成id用
z: get_attribute(script, "zIndex", -1), //z-index
o: get_attribute(script, "opacity", 0.8), //opacity
c: get_attribute(script, "color", "255,255,255"), //color
n: get_attribute(script, "count", 350) //count
};
}
//设置canvas的高宽
function set_canvas_size() {
canvas_width = the_canvas.width = window.innerWidth || document.documentElement.clientWidth || document.body.clientWidth,
canvas_height = the_canvas.height = window.innerHeight || document.documentElement.clientHeight || document.body.clientHeight;
}
//绘制过程
function draw_canvas() {
context.clearRect(0, 0, canvas_width, canvas_height);
//随机的线条和当前位置联合数组
var e, i, d, x_dist, y_dist, dist; //临时节点
//遍历处理每一个点
random_points.forEach(function (r, idx) {
r.x += r.xa,
r.y += r.ya, //移动
r.xa *= r.x > canvas_width || r.x < 0 ? -1 : 1,
r.ya *= r.y > canvas_height || r.y < 0 ? -1 : 1, //碰到边界，反向反弹
context.fillRect(r.x - 0.5, r.y - 0.5, 1, 1); //绘制一个宽高为1的点
//从下一个点开始
for (i = idx + 1; i < all_array.length; i++) {
e = all_array[i];
// 当前点存在
if (null !== e.x && null !== e.y) {
x_dist = r.x - e.x; //x轴距离 l
y_dist = r.y - e.y; //y轴距离 n
dist = x_dist * x_dist + y_dist * y_dist; //总距离, m
dist < e.max && (e === current_point && dist >= e.max / 2 && (r.x -= 0.03 * x_dist, r.y -= 0.03 * y_dist), //靠近的时候加速
d = (e.max - dist) / e.max,
context.beginPath(),
context.lineWidth = d / 2,
context.strokeStyle = "#000000",
context.moveTo(r.x, r.y),
context.lineTo(e.x, e.y),
context.stroke());
}
}
}), frame_func(draw_canvas);
}
//创建画布，并添加到body中
var the_canvas = document.createElement("canvas"), //画布
config = get_config_option(), //配置
canvas_id = "c_n" + config.l, //canvas id
context = the_canvas.getContext("2d"), canvas_width, canvas_height,
frame_func = window.requestAnimationFrame || window.webkitRequestAnimationFrame || window.mozRequestAnimationFrame || window.oRequestAnimationFrame || window.msRequestAnimationFrame || function (func) {
window.setTimeout(func, 1000 / 40);
}, random = Math.random,
current_point = {
x: null, //当前鼠标x
y: null, //当前鼠标y
max: 20000 // 圈半径的平方
},
all_array;
the_canvas.id = canvas_id;
the_canvas.style.cssText = "position:fixed;top:0;left:0;z-index:" + config.z + ";opacity:" + config.o;
get_by_tagname("body")[0].appendChild(the_canvas);
//初始化画布大小
set_canvas_size();
window.onresize = set_canvas_size;
//当时鼠标位置存储，离开的时候，释放当前位置信息
window.onmousemove = function (e) {
e = e || window.event;
current_point.x = e.clientX;
current_point.y = e.clientY;
}, window.onmouseout = function () {
current_point.x = null;
current_point.y = null;
};
//随机生成config.n条线位置信息
for (var random_points = [], i = 0; config.n > i; i++) {
var x = random() * canvas_width, //随机位置
y = random() * canvas_height,
xa = 2 * random() - 1, //随机运动方向
ya = 2 * random() - 1;
// 随机点
random_points.push({
x: x,
y: y,
xa: xa,
ya: ya,
max: 6000 //沾附距离
});
}
all_array = random_points.concat([current_point]);
//0.1秒后绘制
setTimeout(function () {
draw_canvas();
}, 100);
}();
</script>
</body>
</html>
三, 滴墨水
<!DOCTYPE html>
<html lang="en">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>canvas</title>
<style type="text/css">
* {
margin: 0;
padding: 0;
}
body {
100%;
height: 100%;
overflow: hidden;
position: fixed;
}
</style>
<script src="http://www.jq22.com/jquery/jquery-1.10.2.js"></script>
<script src="https://libs.baidu.com/jquery/1.10.2/jquery.min.js"></script>
</head>
<body>
<canvas id="c" width="1536"></canvas>
<script type="text/javascript">
$(document).ready(function () {
var canvas = document.getElementById("c");
var ctx = canvas.getContext("2d");
var c = $("#c");
var w, h;
var pi = Math.PI;
var all_attribute = {
num: 100, // 个数
start_probability: 0.1, // 如果数量小于num，有这些几率添加一个新的
radius_min: 1, // 初始半径最小值
radius_max: 2, // 初始半径最大值
radius_add_min: .3, // 半径增加最小值
radius_add_max: .5, // 半径增加最大值
opacity_min: 0.3, // 初始透明度最小值
opacity_max: 0.5, // 初始透明度最大值
opacity_prev_min: .003, // 透明度递减值最小值
opacity_prev_max: .005, // 透明度递减值最大值
light_min: 40, // 颜色亮度最小值
light_max: 70, // 颜色亮度最大值
};
var style_color = find_random(0, 360);
var all_element = [];
window_resize();
function start() {
window.requestAnimationFrame(start);
style_color += .1;
ctx.fillStyle = 'hsl(' + style_color + ',100%,97%)';
ctx.fillRect(0, 0, w, h);
if (all_element.length < all_attribute.num && Math.random() < all_attribute.start_probability) {
all_element.push(new ready_run);
}
all_element.map(function (line) {
line.to_step();
})
}
function ready_run() {
this.to_reset();
}
ready_run.prototype = {
to_reset: function () {
var t = this;
t.x = find_random(0, w);
t.y = find_random(0, h);
t.radius = find_random(all_attribute.radius_min, all_attribute.radius_max);
t.radius_change = find_random(all_attribute.radius_add_min, all_attribute.radius_add_max);
t.opacity = find_random(all_attribute.opacity_min, all_attribute.opacity_max);
t.opacity_change = find_random(all_attribute.opacity_prev_min, all_attribute.opacity_prev_max);
t.light = find_random(all_attribute.light_min, all_attribute.light_max);
t.color = 'hsl(' + style_color + ',100%,' + t.light + '%)';
},
to_step: function () {
var t = this;
t.opacity -= t.opacity_change;
t.radius += t.radius_change;
if (t.opacity <= 0) {
t.to_reset();
return false;
}
ctx.fillStyle = t.color;
ctx.globalAlpha = t.opacity;
ctx.beginPath();
ctx.arc(t.x, t.y, t.radius, 0, 2 * pi, true);
ctx.closePath();
ctx.fill();
ctx.globalAlpha = 1;
}
}
function window_resize() {
w = window.innerWidth;
h = window.innerHeight;
canvas.width = w;
canvas.height = h;
}
$(window).resize(function () {
window_resize();
});
function find_random(num_one, num_two) {
return Math.random() * (num_two - num_one) + num_one;
}
(function () {
var lastTime = 0;
var vendors = ['webkit', 'moz'];
for (var xx = 0; xx < vendors.length && !window.requestAnimationFrame; ++xx) {
window.requestAnimationFrame = window[vendors[xx] + 'RequestAnimationFrame'];
window.cancelAnimationFrame = window[vendors[xx] + 'CancelAnimationFrame'] ||
window[vendors[xx] + 'CancelRequestAnimationFrame'];
}
if (!window.requestAnimationFrame) {
window.requestAnimationFrame = function (callback, element) {
var currTime = new Date().getTime();
var timeToCall = Math.max(0, 16.7 - (currTime - lastTime));
var id = window.setTimeout(function () {
callback(currTime + timeToCall);
}, timeToCall);
lastTime = currTime + timeToCall;
return id;
};
}
if (!window.cancelAnimationFrame) {
window.cancelAnimationFrame = function (id) {
clearTimeout(id);
};
}
}());
start();
});
</script>
</body>
</html>