Slime Mold (debug mode)

// Inspired by Jason

// https://softologyblog.wordpress.com/2019/04/11/physarum-simulations/

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OPC.button("btoButton", "back to origin");

let agents;

const agentsAmount = 1500;

const sensorOffset = 10;

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// I made the big difference between the angle detected by the sensor and the actual turning angle. As a result, the network became unstable.

const sensorAngle = 20;

const turnAngle = 40;

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function setup() {

  angleMode(DEGREES);

  createCanvas(720, 720);

  pixelDensity(1);

  agents = new Agents();

}

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function buttonPressed() {

  agents = new Agents();

}

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function mouseDragged() {

  stroke("blue");

  strokeWeight(50);

  line(pmouseX, pmouseY, mouseX, mouseY);

}

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function draw() {

  background(255, 10);

  loadPixels();

  for (let i = 10; i--; ) agents.update();

  updatePixels();

}

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class Agent {

  constructor() {

    this.x = width / 2;

    this.y = height / 2;

    this.dir = random(360);

    this.detectedPheromone = 0;

  }

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  updateDirection() {

    const left = this.sense(-sensorAngle);

    const center = this.sense(0);

    const right = this.sense(+sensorAngle);

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// The meaning of "center - 1" is to give priority to center if left, center, and right are all the same.

    const threeWays = [left, center - 1, right];

    const m = min(...threeWays);

    this.detectedPheromone = m;

    const minIndex = threeWays.indexOf(m);

    this.dir += turnAngle * (minIndex - 1);

  }

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  sense(dirOffset) {

    const angle = this.dir + dirOffset;

    let x = floor(this.x + sensorOffset * cos(angle));

    let y = floor(this.y + sensorOffset * sin(angle));

    x = (x + width) % width;

    y = (y + height) % height;

​

    const index = (x + y * width) * 4;

    return pixels[index];

  }

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  updatePosition() {

    this.x += cos(this.dir);

    this.y += sin(this.dir);

    this.x = (this.x + width) % width;

    this.y = (this.y + height) % height;

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    const index = floor(this.x) + floor(this.y) * width;

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    pixels.set([0, 0, 256 - this.detectedPheromone], index * 4);

  }

}

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class Agents {

  constructor() {

    this.agents = Array(agentsAmount)

      .fill()

      .map((e) => new Agent());

  }

  update() {

    this.agents.forEach((e) => e.updateDirection());

    this.agents.forEach((e) => e.updatePosition());

  }

}

​