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// The Nature of Code// Daniel Shiffman// http://natureofcode.comlet { VerletPhysics2D, VerletParticle2D, VerletSpring2D, VerletMinDistanceSpring2D,} = toxi.physics2d;// Reference to physics worldlet physics;// A list of cluster objectslet clusters;// Boolean that indicates whether we draw connections or notlet showPhysics = true;let showParticles = true;function setup() { createCanvas(640, 240); // Initialize the physics physics = new VerletPhysics2D(); // Spawn a new random graph newGraph();}// Spawn a new random graphfunction newGraph() { // Clear physics physics.clear(); // Create new ArrayList (clears old one) clusters = []; // Create 8 random clusters for (let i = 0; i < 9; i++) { clusters.push(new Cluster(random(3, 8), random(20, 100))); } // All clusters connect to all clusters for (let i = 0; i < clusters.length; i++) { for (let j = i + 1; j < clusters.length; j++) { clusters[i].connect(clusters[j]); } }}function draw() { // Update the physics world physics.update(); background(255); // Display all points if (showParticles) { for (let cluster of clusters) { cluster.show(); } } // If we want to see the physics if (showPhysics) { for (let i = 0; i < clusters.length; i++) { // Cluster internal connections clusters[i].showConnections(); // Cluster connections to other clusters for (let j = i + 1; j < clusters.length; j++) { //clusters[i].showConnections(clusters[j]); } } }}// Key press commandsfunction keyPressed() { if (key == "c") { showPhysics = !showPhysics; if (!showPhysics) showParticles = true; } else if (key == "p") { showParticles = !showParticles; if (!showParticles) showPhysics = true; } else if (key == "n") { newGraph(); }}