// http://codingtra.in

// http://patreon.com/codingtrain

// Code for: https://youtu.be/bGz7mv2vD6g

​

function DNA(genes) {

  // Recieves genes and create a dna object

  if (genes) {

    this.genes = genes;

  }

  // If no genes just create random dna

  else {

    this.genes = [];

    for (var i = 0; i < lifespan; i++) {

      // Gives random vectors

      this.genes[i] = p5.Vector.random2D();

      // Sets maximum force of vector to be applied to a rocket

      this.genes[i].setMag(maxforce);

    }

  }

  // Performs a crossover with another member of the species

  this.crossover = function(partner) {

    var newgenes = [];

    // Picks random midpoint

    var mid = floor(random(this.genes.length));

    for (var i = 0; i < this.genes.length; i++) {

      // If i is greater than mid the new gene should come from this partner

      if (i > mid) {

        newgenes[i] = this.genes[i];

      }

      // If i < mid new gene should come from other partners gene's

      else {

        newgenes[i] = partner.genes[i];

      }

    }

    // Gives DNA object an array

    return new DNA(newgenes);

  }

​

  // Adds random mutation to the genes to add variance.

  this.mutation = function() {

    for (var i = 0; i < this.genes.length; i++) {

      // if random number less than 0.01, new gene is then random vector

      if (random(1) < 0.01) {

        this.genes[i] = p5.Vector.random2D();

        this.genes[i].setMag(maxforce);

      }

    }

  }

​

}