// Daniel Shiffman

// http://natureofcode.com

​

// Flow Field Following

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

​

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

let debug = true;

​

// Flowfield object

let flowfield;

// An ArrayList of vehicles

let vehicles = [];

​

function setup() {

​

  let text = createP("Hit space bar to toggle debugging lines.<br>Click the mouse to generate a new flow field.");

  text.position(10, 365);

​

  createCanvas(640, 360);

  // Make a new flow field with "resolution" of 16

  flowfield = new FlowField(20);

  // Make a whole bunch of vehicles with random maxspeed and maxforce values

  for (let i = 0; i < 100; i++) {

    vehicles.push(new Vehicle(random(width), random(height), random(2, 5), random(0.1, 0.5)));

  }

}

​

function draw() {

  background(0);

  // Display the flowfield in "debug" mode

  if (debug) flowfield.display();

  // Tell all the vehicles to follow the flow field

  for (let i = 0; i < vehicles.length; i++) {

    vehicles[i].follow(flowfield);

    vehicles[i].run();

  }

​

}

​

​

function keyPressed() {

  if (key == ' ') {

    debug = !debug;

  }

}

​

// Make a new flowfield

function mousePressed() {

  flowfield.init();

}