// Daniel Shiffman

// http://natureofcode.com

​

// Reference to physics world

var physics;

​

// A list of cluster objects

var cluster;

​

// Boolean that indicates whether we draw connections or not

var showPhysics = true;

var showParticles = true;

​

function setup() {

​

  createCanvas(640, 360);

  createP("'p' to display or hide particles<br>'c' to display or hide connections<br>'n' for new graph");

​

​

  // Initialize the physics

  physics = new VerletPhysics2D();

​

  // Set the world's bounding box

  physics.setWorldBounds(new Rect(0, 0, width, height));

​

  // Spawn a new random graph

  cluster = new Cluster(8, 100, new Vec2D(width / 2, height / 2));

​

}

​

function draw() {

​

  // Update the physics world

  physics.update();

​

  background(0);

​

  // Update physics

  physics.update();

  // Display all points

  if (showParticles) {

    cluster.display();

  }

​

  // If we want to see the physics

  if (showPhysics) {

    cluster.showConnections();

  }

​

}

​

// Key press commands

function keyPressed() {

  if (key == 'c' || key == 'C') {

    showPhysics = !showPhysics;

    if (!showPhysics) showParticles = true;

  } else if (key == 'p' || key == 'P') {

    showParticles = !showParticles;

    if (!showParticles) showPhysics = true;

  } else if (key == 'n' || key == 'N') {

    physics.clear();

    cluster = new Cluster(Math.floor(random(2, 20)), random(10, height - 100), new Vec2D(width / 2, height / 2));

  }

}