// Daniel Shiffman

// http://natureofcode.com

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// Evolution EcoSystem

​

// Creature class

​

// Create a "bloop" creature

class Bloop {

  constructor(position, dna) {

    this.position = position; // Location

    this.health = 200; // Life timer

    this.xoff = random(1000); // For perlin noise

    this.yoff = random(1000);

    this.dna = dna; // DNA

    // DNA will determine size and maxspeed

    // The bigger the bloop, the slower it is

    this.maxspeed = map(this.dna.genes[0], 0, 1, 15, 0);

    this.r = map(this.dna.genes[0], 0, 1, 0, 25);

  }

​

  run() {

    this.update();

    this.borders();

    this.show();

  }

​

  // A bloop can find food and eat it

  eat(food) {

    // Check all the food vectors

    let positions = food.foodPositions;

    for (let i = positions.length - 1; i >= 0; i--) {

      // How far away is the bloop?

      let distance = p5.Vector.dist(this.position, positions[i]);

      // If the food is nearby

      if (distance < this.r * 2) {

        // Increase health and remove the food!

        this.health += 100;

        positions.splice(i, 1);

      }

    }

  }

​

  // At any moment there is a teeny, tiny chance a bloop will reproduce

  reproduce() {

    // Single parent reproduction

    if (random(1) < 0.0005) {

      // Child is exact copy of single parent

      let childDNA = this.dna.copy();

      // Child DNA can mutate

      childDNA.mutate(0.01);

      return new Bloop(this.position.copy(), childDNA);

    } else {

      return null;

    }

  }

​

  // Method to update position

  update() {

    // Simple movement based on perlin noise

    let vx = map(noise(this.xoff), 0, 1, -this.maxspeed, this.maxspeed);

    let vy = map(noise(this.yoff), 0, 1, -this.maxspeed, this.maxspeed);

    let velocity = createVector(vx, vy);

    this.xoff += 0.01;

    this.yoff += 0.01;

​

    this.position.add(velocity);

    // Death always looming

    this.health -= 0.2;

  }

​

  // Wraparound

  borders() {

    if (this.position.x < -this.r) this.position.x = width + this.r;

    if (this.position.y < this.r) this.position.y = height + this.r;

    if (this.position.x > width + this.r) this.position.x = -this.r;

    if (this.position.y > height + this.r) this.position.y = -this.r;

  }

​

  // Method to display

  show() {

    stroke(0, this.health);

    fill(0, this.health);

    circle(this.position.x, this.position.y, this.r * 2);

  }

​

  // Death

  dead() {

    return this.health < 0.0;

  }

}

​