// Daniel Shiffman

// http://natureofcode.com

​

// Path Following

// Path is a just a straight line in this example

// Via Reynolds: // http://www.red3d.com/cwr/steer/PathFollow.html

​

// Using this variable to decide whether to draw all the stuff

let debug = false;

​

// A path object (series of connected points)

let path;

​

// Two vehicles

let vehicles = [];

​

function setup() {

  let text = createP(

    "Hit space bar to toggle debugging lines.<br>Click the mouse to generate a new path."

  );

​

  createCanvas(640, 240);

  newPath();

​

  // Each vehicle has different maxspeed and maxforce for demo purposes

  for (let i = 0; i < 100; i++) {

    vehicles.push(new Vehicle(random(width),height/2, random(2,8), random(0.1,1)))

  }

}

​

function draw() {

  background(255);

  // Display the path

  path.show();

  for (let v of vehicles) {

    // The boids follow the path

    v.follow(path);

    v.run();

    v.borders(path);

  }

}

​

function newPath() {

  // A path is a series of connected points

  // A more sophisticated path might be a curve

  path = new Path();

  path.addPoint(-20, height / 2);

  path.addPoint(random(0, width / 2), random(0, height));

  path.addPoint(random(width / 2, width), random(0, height));

  path.addPoint(width + 20, height / 2);

}

​

function keyPressed() {

  if (key == " ") {

    debug = !debug;

  }

}

​

function mousePressed() {

  newPath();

}

​