NatureOfCode2/grav2.html at master · brlebtag/NatureOfCode2 · GitHub

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<html>
    <head>
        <title>Gravitational Attraction 2 - 2 body problem</title>
        <script src="https://cdn.jsdelivr.net/npm/p5@1.5.0/lib/p5.min.js"></script>
        <script>
            const G = 5;

            class Mover {
                constructor(x, y, m = 1) {
                    this.pos = createVector(x, y);
                    this.velocity = p5.Vector.random2D().mult(0.1); /*p5.Vector.random2D().mult(5)*/
                    this.acceleration = createVector(0, 0);
                    this.mass = m;
                    this.radius = sqrt(this.mass) * 2;
                }

                applyForce(force) {
                    this.acceleration.add(p5.Vector.div(force, this.mass)); // F = m * a => a = F / m (1) => a = F;
                }

                update() {
                    this.velocity.add(this.acceleration);
                    this.pos.add(this.velocity);
                    this.acceleration.set(0, 0);
                }

                show() {
                    stroke(255);
                    strokeWeight(3);
                    fill(255, 100);
                    ellipse(this.pos.x, this.pos.y, this.radius * 2);
                }

                attract(mover) {
                    let force = p5.Vector.sub(this.pos, mover.pos);
                    let distanceSq = constrain(force.magSq(), 100, 1000);
                    let strength = G * (this.mass * mover.mass) / distanceSq;
                    force.setMag(strength);
                    mover.applyForce(force);
                }
            }

            var movers = [];
            const TotalMovers = 2;

            function setup() {
                createCanvas(800, 600);

                /*for (let i = 0; i < TotalMovers; i++) {
                    movers.push(new Mover(random(width), random(height), 50));
                }*/
                movers[0] = new Mover(300, 200, 10);
                movers[1] = new Mover(100, 200, 10);
            }

            function draw() {
                background(0);

                for (const mover of movers) {
                    for (const other of movers) {
                        if (mover !== other) {
                            mover.attract(other);
                        }
                    }
                }

                for (const mover of movers) {
                    mover.update();
                    mover.show();
                }
            }
        </script>
    </head>
</html>