let walker1;

let walker2;

//declares variable for background image

let img;

​

function preload() {

  //uploads background image to appear in the sketch

  img = loadImage('World_Map.jpg');

}

​

function setup() {

  //uploads background image of the sketch and positions and sizes the image

  loadImage('World_Map.jpg', img => {

    image(img, 0, 0, 700, 500, 100, 0, 1900, 1200);

  });

  //creates canvas size for running the sketch

  createCanvas(700, 500);

  //initializes variable for the random walker as a new object class

  walker1 = new Walker(createVector(random(width), random(height)));

  walker2 = new Walker(createVector(random(width), random(height)));

}

​

function draw() {

  background(0);

  //calls two functions for the movement and display of random walker object class

  walker1.step();

  walker1.show();

  walker2.step();

  walker2.show();

​

​

}

​

​

//creates and uses a class for the levy flight random walker object

class Walker {

  constructor(pos) {

    //declares and initializes variable for dot colors of random walker

    this.col = color(255, 0, 0);

    //declares and initializes variable for current x and y positions of random walker

    this.position = pos.copy();

    //initializes vector variable for levy flight velocity

    this.velocity = createVector(random(-3, 3), random(-3, 3));

    //initializes vector variable for levy flight acceleration

    this.acceleration = createVector(-1, 1);

  }

​

  step() {

    //declares and initializes variable for actual levy flight feature for random walker

    var step = p5.Vector.random2D();

    //declares variable and uses if statement to implement levy flight of the random walker

    var r = random(100);

    if (r < 1) {

      step.mult(random(25, 100));

    } else {

      step.setMag(15);

    }

​

    //makes the levy flight walker jump abruptly from one position to another

    this.position.add(step);

    //adds random velocity over time to the random walker

    this.position.add(this.velocity);

    //adds acceleration over time to the random walker

    this.velocity.mult(this.acceleration);

​

    //if statement to keep the x position of the random walker inside the canvas

    if ((this.position.x > width) || (this.position.x < 0)) {

      this.position.x = random(width);

    }

    //if statement to keep the y position of the random walker inside the canvas

    if ((this.position.y > height) || (this.position.y < 0)) {

      this.position.y = random(height);

    }

  }

​

  show() {

    //declares variable to identify RGBA pixel values from certain x and y positions of image

    let current = get(this.position.x, this.position.y);

    //initializes current variable to detect average RGBA pixel values from x and y positions

    current = (current[0] + current[1] + current[2]) / 3;

​

    //conditional to display red dots when x and y positions of random walker are on land

    //if (current < 10) {

    noStroke();

    fill(this.col);

    ellipse(this.position.x, this.position.y, 64);

    //} else {}

  }

}