HTML5 Javascript Canvas Collision 2

by Spsoi

HTML

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <link rel="stylesheet" href="style.css">
    <title>Document</title>
</head>
<body>
    <canvas id="canvas" width="300" height="300"></canvas>
    <script  src="canvas.js" ></script>
</body>
</html>

CSS

canvas {
    border: 1px solid #000;
}

JavaScript

canvas = document.querySelector('#canvas');
let c = canvas.getContext('2d');

canvas.width = innerWidth;
canvas.height = innerHeight;

let mouse = {
    x: innerWidth / 2,
    y: innerHeight / 2
}

let colors = [
    '#2185c5',
    '#7ECEFD',
    '#FFF6E5',
    '#FF7F66'
];

document.addEventListener("mousemove", function(event){
    mouse.x = event.clientX;
    mouse.y = event.clientY;
});

addEventListener("resize", function(){
    console.log()
    canvas.width = innerWidth;
    canvas.height = innerHeight;
    // init();
});

function randomIntFromRange(min, max) {
    return Math.floor(Math.random() * (max - min + 1) + min);
}

function randomColor (color){
    return color[Math.floor(Math.random() * color.length)];
}

function getDistance(x1, y1, x2, y2) { // расчёт дистанции до центра кругов
    let xDistance = x2 -x1; 
    let yDistance = y2 -y1; 

    let distance = Math.pow(xDistance, 2) + Math.pow(yDistance, 2); // Теорема Пифагора

    return Math.sqrt(distance); // квадратный корень числа
}

addEventListener("click", function () {
    init();
})


function Particle (x, y, radius, color) { // шарик
    // 2
    this.x =x;
    this.y = y;
    this.radius = radius;
    this.color = color;

    this.update = function() {
        this.draw();
    }

    this.draw = function () {
        c.beginPath();
            c.arc(this.x, this.y, this.radius, 0, Math.PI * 2, false);
            c.fillStyle = this.color;
            // c.fill(); //*!
            c.stroke();
        c.closePath();
    }
}

let particles; 

function init() { // точка входа
    particles = []; 
    //1
    for (let i = 0; i < 4; i++) { 
        const radius = 100;
        let x = randomIntFromRange(radius, canvas.width - radius); // !*
        let y = randomIntFromRange(radius, canvas.height - radius); // !*
        const color = 'blue';

        if ( i != 0 ) { // Если идёт пересечение кругов, отрисуй в другом месте. 
            for (let j = 0; j < particles.length; j++ ) {
           ...