一个很漂亮的鼠标移动特效，Javascript 脚本，可惜复制到博客园配置适配效果不好
一个很漂亮的鼠标移动特效，Javascript 脚本，可惜复制到博客园配置适配效果不好，暂时记录一下
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>小白教程(json.cn)</title>
</head>
<body>
<script>
var Stats = function() {
var e = Date.now()
, t = e
, i = 0
, n = 1 / 0
, r = 0
, s = 0
, o = 1 / 0
, a = 0
, l = 0
, h = 0
, c = document.createElement("div");
c.id = "stats",
c.addEventListener("mousedown", function(e) {
e.preventDefault(),
v(++h % 2)
}, !1),
c.style.cssText = "width:80px;opacity:0.9;cursor:pointer";
var u = document.createElement("div");
u.id = "fps",
u.style.cssText = "padding:0 0 3px 3px;text-align:left;background-color:#002",
c.appendChild(u);
var d = document.createElement("div");
d.id = "fpsText",
d.style.cssText = "color:#0ff;font-family:Helvetica,Arial,sans-serif;font-size:9px;font-weight:bold;line-height:15px",
d.innerHTML = "FPS",
u.appendChild(d);
var p = document.createElement("div");
for (p.id = "fpsGraph",
p.style.cssText = "position:relative;width:74px;height:30px;background-color:#0ff",
u.appendChild(p); 74 > p.children.length; ) {
var f = document.createElement("span");
f.style.cssText = "width:1px;height:30px;float:left;background-color:#113",
p.appendChild(f)
}
var m = document.createElement("div");
m.id = "ms",
m.style.cssText = "padding:0 0 3px 3px;text-align:left;background-color:#020;display:none",
c.appendChild(m);
var g = document.createElement("div");
g.id = "msText",
g.style.cssText = "color:#0f0;font-family:Helvetica,Arial,sans-serif;font-size:9px;font-weight:bold;line-height:15px",
g.innerHTML = "MS",
m.appendChild(g);
var y = document.createElement("div");
for (y.id = "msGraph",
y.style.cssText = "position:relative;width:74px;height:30px;background-color:#0f0",
m.appendChild(y); 74 > y.children.length; ) {
var f = document.createElement("span");
f.style.cssText = "width:1px;height:30px;float:left;background-color:#131",
y.appendChild(f)
}
var v = function(e) {
switch (h = e) {
case 0:
u.style.display = "block",
m.style.display = "none";
break;
case 1:
u.style.display = "none",
m.style.display = "block"
}
}
, b = function(e, t) {
var i = e.appendChild(e.firstChild);
i.style.height = t + "px"
};
return {
REVISION: 11,
domElement: c,
setMode: v,
begin: function() {
e = Date.now()
},
end: function() {
var h = Date.now();
return i = h - e,
n = Math.min(n, i),
r = Math.max(r, i),
g.textContent = i + " MS (" + n + "-" + r + ")",
b(y, Math.min(30, 30 - 30 * (i / 200))),
l++,
h > t + 1e3 && (s = Math.round(1e3 * l / (h - t)),
o = Math.min(o, s),
a = Math.max(a, s),
d.textContent = s + " FPS (" + o + "-" + a + ")",
b(p, Math.min(30, 30 - 30 * (s / 100))),
t = h,
l = 0),
h
},
update: function() {
e = this.end()
}
}
};
(function (window) {
var ctx,
hue,
target = {},
tendrils = [],
settings = {};
settings.friction = 0.5;
settings.trails = 20;
settings.size = 50;
settings.dampening = 0.25;
settings.tension = 0.98;
Math.TWO_PI = Math.PI * 2;
function Oscillator(options) {
this.init(options || {});
}
Oscillator.prototype = (function () {
var value = 0;
return {
init: function (options) {
this.phase = options.phase || 0;
this.offset = options.offset || 0;
this.frequency = options.frequency || 0.001;
this.amplitude = options.amplitude || 1;
},
update: function () {
this.phase += this.frequency;
value = this.offset + Math.sin(this.phase) * this.amplitude;
return value;
},
value: function () {
return value;
}
};
})();
function Tendril(options) {
this.init(options || {});
}
Tendril.prototype = (function () {
function Node() {
this.x = 0;
this.y = 0;
this.vy = 0;
this.vx = 0;
}
return {
init: function (options) {
this.spring = options.spring + (Math.random() * 0.1) - 0.05;
this.friction = settings.friction + (Math.random() * 0.01) - 0.005;
this.nodes = [];
for (var i = 0, node; i < settings.size; i++) {
node = new Node();
node.x = target.x;
node.y = target.y;
this.nodes.push(node);
}
},
update: function () {
var spring = this.spring,
node = this.nodes[0];
node.vx += (target.x - node.x) * spring;
node.vy += (target.y - node.y) * spring;
for (var prev, i = 0, n = this.nodes.length; i < n; i++) {
node = this.nodes[i];
if (i > 0) {
prev = this.nodes[i - 1];
node.vx += (prev.x - node.x) * spring;
node.vy += (prev.y - node.y) * spring;
node.vx += prev.vx * settings.dampening;
node.vy += prev.vy * settings.dampening;
}
node.vx *= this.friction;
node.vy *= this.friction;
node.x += node.vx;
node.y += node.vy;
spring *= settings.tension;
}
},
draw: function () {
var x = this.nodes[0].x,
y = this.nodes[0].y,
a, b;
ctx.beginPath();
ctx.moveTo(x, y);
for (var i = 1, n = this.nodes.length - 2; i < n; i++) {
a = this.nodes[i];
b = this.nodes[i + 1];
x = (a.x + b.x) * 0.5;
y = (a.y + b.y) * 0.5;
ctx.quadraticCurveTo(a.x, a.y, x, y);
}
a = this.nodes[i];
b = this.nodes[i + 1];
ctx.quadraticCurveTo(a.x, a.y, b.x, b.y);
ctx.stroke();
ctx.closePath();
}
};
})();
function init(event) {
document.removeEventListener('mousemove', init);
document.removeEventListener('touchstart', init);
document.addEventListener('mousemove', mousemove);
document.addEventListener('mouseout',mouseout);
resize();
loop();
}
function reset() {
tendrils = [];
for (var i = 0; i < settings.trails; i++) {
tendrils.push(new Tendril({
spring: 0.45 + 0.025 * (i / settings.trails)
}));
}
}
function loop() {
if (!ctx.running) return;
ctx.globalCompositeOperation = 'source-over';
ctx.fillStyle = 'rgba(8,5,16,0.4)';
ctx.fillRect(0, 0, ctx.canvas.width, ctx.canvas.height);
ctx.globalCompositeOperation = 'lighter';
ctx.strokeStyle = 'hsla(' + Math.round(hue.update()) + ',90%,50%,0.25)';
ctx.lineWidth = 1;
if (ctx.frame % 60 == 0) {
console.log(hue.update(), Math.round(hue.update()), hue.phase, hue.offset, hue.frequency, hue.amplitude);
}
for (var i = 0, tendril; i < settings.trails; i++) {
tendril = tendrils[i];
tendril.update();
tendril.draw();
}
ctx.frame++;
ctx.stats.update();
requestAnimFrame(loop);
}
function resize() {
ctx.canvas.width = window.innerWidth;
ctx.canvas.height = window.innerHeight;
}
function start() {
if (!ctx.running) {
ctx.running = true;
loop();
}
}
function mousemove(event) {
target.x = event.pageX;
target.y = event.pageY;
}
function mouseout() {
target = { x: ctx.canvas.width * 0.5, y: ctx.canvas.height * 0.5 };
}
window.requestAnimFrame = (function () {
return window.requestAnimationFrame || window.webkitRequestAnimationFrame || window.mozRequestAnimationFrame || window.oRequestAnimationFrame || window.msRequestAnimationFrame || function (fn) {
window.setTimeout(fn, 1000 / 60);
};
})();
window.onload = function () {
ctx = document.createElement('canvas').getContext('2d');
ctx.stats = new Stats();
hue = new Oscillator({
phase: Math.random() * Math.TWO_PI,
amplitude: 85,
frequency: 0.0015,
offset: 285
});
document.body.appendChild(ctx.canvas);
window.addEventListener('resize', resize);
mouseout();
reset();
start();
resize();
document.addEventListener('mousemove', init);
}
})(window);
</script>
</body>
</html>
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