NatureOfCode2/challenge-124.html at master · brlebtag/NatureOfCode2 · GitHub

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<html>
    <head>
        <title>Challenge #124 - Flock Simulation</title>
        <script src="https://cdn.jsdelivr.net/npm/p5@1.5.0/lib/p5.min.js"></script>
        <script>

            let flock = [];
            const TOTAL_FLOCK = 50;
            const MAX_PERCEPTION_RADIUS = 50;
            let alignSlider, cohesionSlider, separationSlider;

            class Boid {
                constructor(x, y) {
                    this.position = createVector(x, y);
                    this.velocity = p5.Vector.random2D();
                    this.velocity.setMag(random(0.5, 1.5));
                    this.acceleration = createVector(0, 0);
                    this.maxForce = 0.2;
                    this.maxSpeed = 4;
                }

                applyForce(force) {
                    this.acceleration.add(force);
                }
                edges() {
                    if (this.position.x > width) {
                        this.position.x = 0;
                    } else if (this.position.x < 0) {
                        this.position.x = width;
                    }

                    if (this.position.y > height) {
                        this.position.y = 0;
                    } else if (this.position.y < 0) {
                        this.position.y = height;
                    }
                }

                update() {
                    this.acceleration.limit(this.maxForce);
                    this.velocity.add(this.acceleration);
                    this.velocity.limit(this.maxSpeed);
                    this.position.add(this.velocity);
                    this.acceleration.set(0, 0);
                }

                align(boids) {
                    let steeringForce = createVector(); //desiredVelocity

                    for (const other of boids) {
                        steeringForce.add(other.velocity);
                    }

                    if (boids.length > 0) {
                        steeringForce.div(boids.length);
                        steeringForce.setMag(this.maxSpeed);
                        steeringForce.sub(this.velocity); // steeringForce = p5.Vector.sub(desiredVelocity, this.velocity)
                    }

                    return steeringForce;
                }

                cohesion(boids) {
                    let steeringForce = createVector(); //desiredVelocity

                    for (const other of boids) {
                        steeringForce.add(other.position);
                    }

                    if (boids.length > 0) {
                        steeringForce.div(boids.length); // medium position
                        steeringForce.sub(this.position);
                        steeringForce.setMag(this.maxSpeed);
                        steeringForce.sub(this.velocity); // steeringForce = p5.Vector.sub(desiredVelocity, this.velocity)
                        steeringForce.limit(this.maxForce);
                    }

                    return steeringForce;
                }

                separation(boids) {
                    let steeringForce = createVector(); //desiredVelocity

                    for (const other of boids) {
                        let difference = p5.Vector.sub(this.position, other.position); // a force towards me
                        difference.div(difference.mag());
                        steeringForce.add(difference);
                    }

                    if (boids.length > 0) {
                        steeringForce.div(boids.length); // medium position
                        steeringForce.setMag(this.maxSpeed);
                        steeringForce.sub(this.velocity); // steeringForce = p5.Vector.sub(desiredVelocity, this.velocity)
                        steeringForce.limit(this.maxForce);
                    }

                    return steeringForce;
                }

                flock(boids) {
                    let self = this;
                    var closest = boids.filter(
                        other => p5.Vector.dist(self.position, other.position) < MAX_PERCEPTION_RADIUS &&
                        other != self
                    );

                    this.applyForce(this.align(closest).mult(alignSlider.value()));
                    this.applyForce(this.cohesion(closest).mult(cohesionSlider.value()));
                    this.applyForce(this.separation(closest).mult(separationSlider.value()));
                }

                show() {
                    strokeWeight(16);
                    stroke(255);
                    point(this.position.x, this.position.y);
                }
            }

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

                alignSlider = createSlider(0, 5, 0.1);
                cohesionSlider = createSlider(0, 5, 0.1);
                separationSlider = createSlider(0, 5, 0.1);

                for (let i = 0; i < TOTAL_FLOCK; i++) {
                    flock.push(new Boid(random(width), random(height)));
                }
            }

            function draw() {
                background(51);

                for (const boid of flock) {
                    boid.edges();
                    boid.flock(flock);
                    boid.update();
                    boid.show();
                }
            }
        </script>
    </head>
</html>