html,body{
border: 0;
padding: 0;
margin: 0;
overflow: hidden;
background: #000;
}
.info{
z-index:999;
position : absolute;
left:0;
top:0;
padding:10px;
color:#fff;
background: rgba(0,0,0,0.5);
text-transform:capitalize;
}
index.js
var canvas = document.getElementById('c');
var ctx = canvas.getContext("2d");
var height = void 0,width = void 0,innerpoints = [],outerpoints = [],particles = [];
var noofpoints = 200,trashold = 10;
var x = void 0,y = void 0,p = void 0,n = void 0,point = void 0,dx = void 0,dy = void 0,color = void 0;
deltaangle = Math.PI * 2 / noofpoints,
r = Math.min(height, width) * 0.5;
var distance = function distance(x1, y1, x2, y2) {
return Math.sqrt(Math.pow(y2 - y1, 2) + Math.pow(x2 - x1, 2));
};
var mapVal = function mapVal(num, in_min, in_max, out_min, out_max) {
return (num - in_min) * (out_max - out_min) / (in_max - in_min) + out_min;
};
var resize = function resize() {
height = ctx.canvas.clientHeight;
width = ctx.canvas.clientWidth;
if (ctx.canvas.clientWidth !== canvas.width ||
ctx.canvas.clientHeight !== canvas.height)
{
console.log("resized");
canvas.width = width;
canvas.height = height;
ctx.translate(canvas.width / 2, canvas.height / 2);
ctx.rotate(-Math.PI);
innerpoints = [];
r = 10;
for (var i = deltaangle; i <= Math.PI * 2; i += deltaangle) {
x = r * 16 * Math.pow(Math.sin(i), 3);
y = r * (13 * Math.cos(i) - 5 * Math.cos(2 * i) - 2 * Math.cos(3 * i) - Math.cos(4 * i));
innerpoints.push({
x: x,
y: y });
x = 10 * r * 16 * Math.pow(Math.sin(i), 3);
y = 10 * r * (13 * Math.cos(i) - 5 * Math.cos(2 * i) - 2 * Math.cos(3 * i) - Math.cos(4 * i));
outerpoints.push({
x: x,
y: y });
var step = random(0.001, 0.003, true);
particles.push({
step: step,
x: x,
y: y });
}
}
};
var random = function random(min, max, isFloat) {
if (isFloat) {
return Math.random() * (max - min) + min;
}
return ~~(Math.random() * (max - min) + min);
};
resize();
//particles = [...outerpoints];
ctx.globalAlpha = 0.5;
ctx.globalCompositeOperation = 'source-over';
var draw = function draw() {
ctx.fillStyle = "rgba(0,0,0,0.03)";
ctx.fillRect(-width, -height, width * 2, height * 2);
ctx.beginPath();
for (var i = 0; i < innerpoints.length; i++) {
s = outerpoints[i];
d = innerpoints[i];
point = particles[i];
if (distance(point.x, point.y, d.x, d.y) > 10) {
dx = d.x - s.x;
dy = d.y - s.y;
point.x += dx * point.step;
point.y += dy * point.step;
color = distance(0, 0, point.x, point.y);
ctx.beginPath();
ctx.fillStyle = "hsl(" + color % 360 + ",100%,50%)";
ctx.arc(point.x, point.y, 2, 0, Math.PI * 2, false);
ctx.closePath();
ctx.fill();
} else {
point.x = d.x;
point.y = d.y;
ctx.beginPath();
ctx.arc(point.x, point.y, 2, 0, Math.PI * 2, false);
ctx.closePath();
ctx.fill();
particles[i].x = s.x;
particles[i].y = s.y;
particles[i].step = random(0.001, 0.003, true);
}
}
};
var render = function render() {
resize();
draw();
requestAnimationFrame(render);
};
requestAnimationFrame(render);
----都看到这儿了，顺手点个赞吧！！！！
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