程序员蠕动的脑神经
在这里插入图片描述
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>程序员蠕动的脑神经</title>
<style>
body,
html {
margin: 0px;
padding: 0px;
position: fixed;
background: rgb(30, 30, 30);
cursor: none;
}
</style>
<script>
window.requestAnimFrame = (function() {
return (
window.requestAnimationFrame ||
window.webkitRequestAnimationFrame ||
window.mozRequestAnimationFrame ||
window.oRequestAnimationFrame ||
window.msRequestAnimationFrame ||
function(callback) {
window.setTimeout(callback);
}
);
});
function init(elemid) {
let canvas = document.getElementById(elemid),
c = canvas.getContext("2d"),
w = (canvas.width = window.innerWidth),
h = (canvas.height = window.innerHeight);
c.fillStyle = "rgba(30,30,30,1)";
c.fillRect(0, 0, w, h);
return {
c: c,
canvas: canvas
};
}
</script>
</head>
<body>
<canvas id="canvas"></canvas>
</body>
<script>
window.onload = function() {
//functions definition
//class definition
class segm {
constructor(x, y, l) {
this.b = Math.random() * 1.9 + 0.1;
this.x0 = x;
this.y0 = y;
this.a = Math.random() * 2 * Math.PI;
this.x1 = this.x0 + l * Math.cos(this.a);
this.y1 = this.y0 + l * Math.sin(this.a);
this.l = l;
}
update(x, y) {
this.x0 = x;
this.y0 = y;
this.a = Math.atan2(this.y1 - this.y0, this.x1 - this.x0);
this.x1 = this.x0 + this.l * Math.cos(this.a);
this.y1 = this.y0 + this.l * Math.sin(this.a);
}
}
class rope {
constructor(tx, ty, l, b, slq) {
this.res = l / slq;
this.l = l;
this.segm = [];
this.segm.push(new segm(tx, ty, this.l / this.res));
for (let i = 1; i < this.res; i++) {
this.segm.push(
new segm(this.segm[i - 1].x1, this.segm[i - 1].y1, this.l / this.res)
);
}
this.b = b;
}
update(t) {
this.segm[0].update(t.x, t.y);
for (let i = 1; i < this.res; i++) {
this.segm[i].update(this.segm[i - 1].x1, this.segm[i - 1].y1);
}
}
show(t) {
if (t == "l") {
c.beginPath();
for (let i = 0; i < this.segm.length; i++) {
c.lineTo(this.segm[i].x0, this.segm[i].y0);
}
c.lineTo(
this.segm[this.segm.length - 1].x1,
this.segm[this.segm.length - 1].y1
);
c.strokeStyle = "white";
c.lineWidth = this.b;
c.stroke();
c.beginPath();
c.arc(this.segm[0].x0, this.segm[0].y0, 1, 0, 2 * Math.PI);
c.fillStyle = "white";
c.fill();
c.beginPath();
c.arc(
this.segm[this.segm.length - 1].x1,
this.segm[this.segm.length - 1].y1,
2,
0,
2 * Math.PI
);
c.fillStyle = "white";
c.fill();
} else {
for (let i = 0; i < this.segm.length; i++) {
c.beginPath();
c.arc(this.segm[i].x0, this.segm[i].y0, this.segm[i].b, 0, 2 * Math.PI);
c.fillStyle = "white";
c.fill();
}
c.beginPath();
c.arc(
this.segm[this.segm.length - 1].x1,
this.segm[this.segm.length - 1].y1,
2, 0, 2 * Math.PI
);
c.fillStyle = "white";
c.fill();
}
}
}
//setting up canvas
let c = init("canvas").c,
canvas = init("canvas").canvas,
w = (canvas.width = window.innerWidth),
h = (canvas.height = window.innerHeight),
ropes = [];
//variables definition
let nameOfVariable = "value",
mouse = {},
last_mouse = {},
rl = 50,
randl = [],
target = {
x: w / 2,
y: h / 2
},
last_target = {},
t = 0,
q = 10,
da = [],
type = "l";
for (let i = 0; i < 100; i++) {
ropes.push(
new rope(
w / 2,
h / 2,
(Math.random() * 1 + 0.5) * 500,
Math.random() * 0.4 + 0.1,
Math.random() * 15 + 5
)
);
randl.push(Math.random() * 2 - 1);
da.push(0);
}
//place for objects in animation
function draw() {
if (mouse.x) {
target.errx = mouse.x - target.x;
target.erry = mouse.y - target.y;
} else {
target.errx =
w / 2 +
(h / 2 - q) *
Math.sqrt(2) *
Math.cos(t) /
(Math.pow(Math.sin(t), 2) + 1) -
target.x;
target.erry =
h / 2 +
(h / 2 - q) *
Math.sqrt(2) *
Math.cos(t) *
Math.sin(t) /
(Math.pow(Math.sin(t), 2) + 1) -
target.y;
}
target.x += target.errx / 10;
target.y += target.erry / 10;
t += 0.01;
for (let i = 0; i < ropes.length; i++) {
if (randl[i] > 0) {
da[i] += (1 - randl[i]) / 10;
} else {
da[i] += (-1 - randl[i]) / 10;
}
ropes[i].update({
x: target.x +
randl[i] * rl * Math.cos((i * 2 * Math.PI) / ropes.length + da[i]),
y: target.y +
randl[i] * rl * Math.sin((i * 2 * Math.PI) / ropes.length + da[i])
});
if (randl[i] > -0.5) {
type = "l";
} else {
type = "o";
}
ropes[i].show(type);
}
last_target.x = target.x;
last_target.y = target.y;
}
//mouse position
canvas.addEventListener(
"mousemove",
function(e) {
last_mouse.x = mouse.x;
last_mouse.y = mouse.y;
mouse.x = e.pageX - this.offsetLeft;
mouse.y = e.pageY - this.offsetTop;
},
false
);
canvas.addEventListener("mouseleave", function(e) {
mouse.x = false;
mouse.y = false;
});
//animation frame
function loop() {
window.requestAnimFrame(loop);
c.clearRect(0, 0, w, h);
draw();
}
//window resize
window.addEventListener("resize", function() {
(w = canvas.width = window.innerWidth),
(h = canvas.height = window.innerHeight);
loop();
});
//animation runner
loop();
setInterval(loop, 1000 / 60);
};
</script>
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原始发表：2020-11-20 ，如有侵权请联系 cloudcommunity@tencent.com 删除
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