JavaScript

语言：

JaveScriptBabelCoffeeScript

确定

let max_particles = 300;

let particles = [];

let frequency = 100;

let init_num = max_particles;

let max_time = frequency*max_particles;

let time_to_recreate = false;

// Enable repopolate

setTimeout(function(){

time_to_recreate = true;

}.bind(this), max_time)

// Popolate particles

popolate(max_particles);

var tela = document.createElement('canvas');

tela.width = $(window).width();

tela.height = $(window).height();

$("body").append(tela);

var canvas = tela.getContext('2d');

class Particle{

constructor(canvas, options){

let colors = ["#feea00","#a9df85","#5dc0ad", "#ff9a00","#fa3f20"]

let types = ["full","fill","empty"]

this.random = Math.random()

this.canvas = canvas;

this.progress = 0;

this.x = ($(window).width()/2) + (Math.random()*200 - Math.random()*200)

this.y = ($(window).height()/2) + (Math.random()*200 - Math.random()*200)

this.w = $(window).width()

this.h = $(window).height()

this.radius = 1 + (8*this.random)

this.type = types[this.randomIntFromInterval(0,types.length-1)];

this.color = colors[this.randomIntFromInterval(0,colors.length-1)];

this.a = 0

this.s = (this.radius + (Math.random() * 1))/10;

//this.s = 12 //Math.random() * 1;

}

getCoordinates(){

return {

x: this.x,

y: this.y

}

}

randomIntFromInterval(min,max){

return Math.floor(Math.random()*(max-min+1)+min);

}

render(){

// Create arc

let lineWidth = 0.2 + (2.8*this.random);

let color = this.color;

switch(this.type){

case "full":

this.createArcFill(this.radius, color)

this.createArcEmpty(this.radius+lineWidth, lineWidth/2, color)

break;

case "fill":

this.createArcFill(this.radius, color)

break;

case "empty":

this.createArcEmpty(this.radius, lineWidth, color)

break;

}

}

createArcFill(radius, color){

this.canvas.beginPath();

this.canvas.arc(this.x, this.y, radius, 0, 2 * Math.PI);

this.canvas.fillStyle = color;

this.canvas.fill();

this.canvas.closePath();

}

createArcEmpty(radius, lineWidth, color){

this.canvas.beginPath();

this.canvas.arc(this.x, this.y, radius, 0, 2 * Math.PI);

this.canvas.lineWidth = lineWidth;

this.canvas.strokeStyle = color;

this.canvas.stroke();

this.canvas.closePath();

}

move(){

this.x += Math.cos(this.a) * this.s;

this.y += Math.sin(this.a) * this.s;

this.a += Math.random() * 0.4 - 0.2;

if(this.x < 0 || this.x > this.w - this.radius){

return false

}

if(this.y < 0 || this.y > this.h - this.radius){

return false

}

this.render()

return true

}

calculateDistance(v1, v2){

let x = Math.abs(v1.x - v2.x);

let y = Math.abs(v1.y - v2.y);

return Math.sqrt((x * x) + (y * y));

}

}

/*

* Function to clear layer canvas

* @num:number number of particles

*/

function popolate(num){

for (var i = 0; i < num; i++) {

setTimeout(

function(x){

return function(){

// Add particle

particles.push(new Particle(canvas))

};

}(i)

,frequency*i);

}

return particles.length

}

function clear(){

// canvas.globalAlpha=0.04;

canvas.fillStyle='#111111';

canvas.fillRect(0, 0, tela.width, tela.height);

// canvas.globalAlpha=1;

}

function connection(){

let old_element = null

$.each(particles, function(i, element){

if(i>0){

let box1 = old_element.getCoordinates()

let box2 = element.getCoordinates()

canvas.beginPath();

canvas.moveTo(box1.x,box1.y);

canvas.lineTo(box2.x,box2.y);

canvas.lineWidth = 0.45;

canvas.strokeStyle="#3f47ff";

canvas.stroke();

canvas.closePath();

}

old_element = element

})

}

/*

* Function to update particles in canvas

*/

function update(){

clear();

connection()

particles = particles.filter(function(p) { return p.move() })

// Recreate particles

if(time_to_recreate){

if(particles.length < init_num){ popolate(1);}

}

requestAnimationFrame(update.bind(this))

}

update()