​

​

class Vehicle {

  constructor(x, y) {

    this.acceleration = createVector(0, 0);

    this.velocity = createVector(0, -2);

    this.position = createVector(x, y);

    this.r = 6;

    this.maxspeed = 4;

    this.maxforce = 0.4;

    this.energy = 2;

    this.intel = 1;

  }

​

  // Method to update location

  update() {

    // Update velocity

    this.velocity.add(this.acceleration);

    // Limit speed

    this.velocity.limit(this.maxspeed);

    this.position.add(this.velocity);

    // Reset accelerationelertion to 0 each cycle

    this.acceleration.mult(0);

  }

​

  applyForce(force) {

    // We could add mass here if we want A = F / M

    this.acceleration.add(force);

  }

  eat(list){

    var record = Infinity;

    var closestIndex = -1;

    //get the closest item in given list, food or poison

    for(var i = 0; i<list.length ;  i++)

      {

        var d = this.position.dist(list[i]);

        if(d<record){

          record = d;

          closestIndex = i;

        }

      }

    //seek it using steer

    this.seek(list[closestIndex]);

    //if food is eaten, then it is removed from list and energy is gained

    if(record < 5){

      if(list[closestIndex]==food[closestIndex]){

        this.energy ++;

          if(food.length>1){ //One food spot always remains

          food.splice(closestIndex,1);

        }

        if(this.energy>10) //Reproduction if enough food is eaten

          {

​

            var offspring = new Vehicle(width/2,height/2);

            v.push(offspring);

            this.energy=1;

            offspring.intel = this.intel;

          }

​

        if(this.intel>1 && this.energy > 7)

          {

            var offspring = new Vehicle(width/2,height/2);

            v.push(offspring);

            this.energy=1;

            offspring.intel = this.intel;

            offspring.energy = 4;

          }

      }

      //If poison is consumed energy is decreased and the poison spot is erased

      else{

        if(this.energy>-2){

          this.energy --;

        }

        if(poison.length>1){

          poison.splice(closestIndex,1);

        }

        if(this.energy<-1){ //Death if too much poison is eaten

          this.maxspeed = 0;

        }

      }

      }

  }

​

  seek(target) {

​

    var desired = p5.Vector.sub(target, this.position); // A vector pointing from the location to the target

​

    // Scale to maximum speed

    desired.setMag(this.maxspeed);

​

    // Steering = Desired minus velocity

    var steer = p5.Vector.sub(desired, this.velocity);

    steer.limit(this.maxforce); // Limit to maximum steering force

​

    this.applyForce(steer);

  }

​

  display() {

    // Draw a triangle rotated in the direction of velocity

    let theta = this.velocity.heading() + PI / 2;

    fill(127);

    if(this.maxspeed == 0){fill(255,0,0);} //Turn red if dead

    //Color changes as energy grows

    if(this.energy>3){

      fill(245, 147, 66)

    }

    if(this.energy>7)

      {

        fill(239, 245, 66);

      }

    if(this.energy>9){

      fill(141, 245, 66);

    }

    stroke(200);

    strokeWeight(1);

    push();

    translate(this.position.x, this.position.y);

    rotate(theta);

    beginShape();

    //For Evolved Vehicles

    if(this.intel>1){

      stroke(255);

      strokeWeight(6);

    }

    //Triangles grow with more energy, bigger vehicles are closer to reproduction

    vertex(0, -this.r * 2 *this.energy *0.1);

    vertex(-this.r, this.r * 2);

    vertex(this.r, this.r * 2 );

    endShape(CLOSE);

    pop();

  }

}