| 1 | <!DOCTYPE html>
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| 2 | <html>
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| 3 | <head>
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| 4 | <meta charset="UTF-8">
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| 5 | <title>Tadpoles</title>
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| 6 | <link rel="stylesheet" href="../css/style.css">
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| 7 | <script type="text/javascript" src="../../dist/paper.js"></script>
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| 8 | <script type="text/paperscript" canvas="canvas">
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| 9 | // Adapted from Flocking Processing example by Daniel Schiffman:
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| 10 | // http://processing.org/learning/topics/flocking.html
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| 11 |
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| 12 | var Boid = Base.extend({
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| 13 | initialize: function(position, maxSpeed, maxForce) {
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| 14 | var strength = Math.random() * 0.5;
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| 15 | this.acceleration = new Point();
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| 16 | this.vector = Point.random() * 2 - 1;
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| 17 | this.position = position.clone();
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| 18 | this.radius = 30;
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| 19 | this.maxSpeed = maxSpeed + strength;
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| 20 | this.maxForce = maxForce + strength;
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| 21 | this.points = [];
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| 22 | for (var i = 0, l = strength * 10 + 10; i < l; i++) {
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| 23 | this.points.push(new Point());
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| 24 | }
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| 25 | this.count = 0;
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| 26 | this.lastAngle = 0;
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| 27 | this.distances = [];
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| 28 | this.createItems();
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| 29 | },
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| 30 |
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| 31 | run: function(boids) {
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| 32 | this.lastLoc = this.position.clone();
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| 33 | if (!groupTogether) {
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| 34 | this.flock(boids);
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| 35 | } else {
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| 36 | this.align(boids);
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| 37 | }
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| 38 | this.borders();
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| 39 | this.update();
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| 40 | this.calculateTail();
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| 41 | this.updateItems();
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| 42 | },
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| 43 |
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| 44 | calculateTail: function() {
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| 45 | var points = this.points;
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| 46 | var speed = this.vector.length;
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| 47 | var pieceLength = 5 + speed * 0.3;
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| 48 | var point = points[0] = this.position.clone();
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| 49 | var lastVector = this.vector.clone();
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| 50 | for (var i = 1, l = points.length; i < l; i++) {
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| 51 | this.count += speed * 15;
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| 52 | var vector = point - points[i];
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| 53 | var rotated = lastVector.rotate(90);
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| 54 | rotated.length = Math.sin((this.count + i * 3) * 0.003);
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| 55 | lastVector.length = -pieceLength;
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| 56 | point += lastVector;
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| 57 | points[i] = point + rotated;
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| 58 | lastVector = vector;
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| 59 | }
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| 60 | },
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| 61 |
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| 62 | createItems: function() {
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| 63 | this.head = (project.symbols[0]
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| 64 | ? project.symbols[0]
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| 65 | : new Symbol(new Path.Ellipse({
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| 66 | from: [0, 0],
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| 67 | to: [13, 8],
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| 68 | fillColor: 'white'
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| 69 | }))).place();
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| 70 | this.path = new Path({
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| 71 | strokeColor: 'white',
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| 72 | strokeWidth: 2,
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| 73 | strokeCap: 'round'
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| 74 | });
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| 75 | this.shortPath = new Path({
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| 76 | strokeColor: 'white',
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| 77 | strokeWidth: 4,
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| 78 | strokeCap: 'round'
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| 79 | });
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| 80 | },
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| 81 |
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| 82 | updateItems: function() {
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| 83 | this.path.segments = this.points;
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| 84 | this.shortPath.segments = this.points.slice(0, 3);
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| 85 |
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| 86 | this.head.position = this.position;
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| 87 | var angle = this.vector.angle;
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| 88 | this.head.rotate(angle - this.lastAngle);
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| 89 | this.lastAngle = angle;
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| 90 | },
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| 91 |
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| 92 | // We accumulate a new acceleration each time based on three rules
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| 93 | flock: function(boids) {
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| 94 | this.calculateDistances(boids);
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| 95 | var separation = this.separate(boids) * 3;
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| 96 | var alignment = this.align(boids);
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| 97 | var cohesion = this.cohesion(boids);
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| 98 | this.acceleration += separation + alignment + cohesion;
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| 99 | },
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| 100 |
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| 101 | calculateDistances: function(boids) {
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| 102 | for (var i = 0, l = boids.length; i < l; i++) {
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| 103 | var other = boids[i];
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| 104 | this.distances[i] = other.position.getDistance(this.position, true);
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| 105 | }
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| 106 | },
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| 107 |
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| 108 | update: function() {
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| 109 | // Update velocity
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| 110 | this.vector += this.acceleration;
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| 111 | // Limit speed (vector#limit?)
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| 112 | this.vector.length = Math.min(this.maxSpeed, this.vector.length);
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| 113 | this.position += this.vector;
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| 114 | // Reset acceleration to 0 each cycle
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| 115 | this.acceleration = new Point();
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| 116 | },
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| 117 |
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| 118 | seek: function(target) {
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| 119 | this.acceleration += this.steer(target, false);
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| 120 | },
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| 121 |
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| 122 | arrive: function(target) {
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| 123 | this.acceleration += this.steer(target, true);
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| 124 | },
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| 125 |
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| 126 | borders: function() {
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| 127 | var vector = new Point();
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| 128 | var position = this.position;
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| 129 | var radius = this.radius;
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| 130 | var size = view.size;
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| 131 | if (position.x < -radius) vector.x = size.width + radius;
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| 132 | if (position.y < -radius) vector.y = size.height + radius;
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| 133 | if (position.x > size.width + radius) vector.x = -size.width -radius;
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| 134 | if (position.y > size.height + radius) vector.y = -size.height -radius;
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| 135 | if (!vector.isZero()) {
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| 136 | this.position += vector;
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| 137 | var points = this.points;
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| 138 | for (var i = 0, l = points.length; i < l; i++) {
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| 139 | points[i] += vector;
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| 140 | }
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| 141 | }
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| 142 | },
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| 143 |
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| 144 | // A method that calculates a steering vector towards a target
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| 145 | // Takes a second argument, if true, it slows down as it approaches
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| 146 | // the target
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| 147 | steer: function(target, slowdown) {
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| 148 | var steer,
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| 149 | desired = target - this.position;
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| 150 | var distance = desired.length;
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| 151 | // Two options for desired vector magnitude
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| 152 | // (1 -- based on distance, 2 -- maxSpeed)
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| 153 | if (slowdown && distance < 100) {
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| 154 | // This damping is somewhat arbitrary:
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| 155 | desired.length = this.maxSpeed * (distance * 0.001);
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| 156 | } else {
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| 157 | desired.length = this.maxSpeed;
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| 158 | }
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| 159 | steer = desired - this.vector;
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| 160 | steer.length = Math.min(this.maxForce, steer.length);
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| 161 | return steer;
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| 162 | },
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| 163 |
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| 164 | separate: function(boids) {
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| 165 | var desiredSeperation = 3600;
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| 166 | var steer = new Point();
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| 167 | var count = 0;
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| 168 | // For every boid in the system, check if it's too close
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| 169 | for (var i = 0, l = boids.length; i < l; i++) {
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| 170 | var distance = this.distances[i];
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| 171 | if (distance > 0 && distance < desiredSeperation) {
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| 172 | // Calculate vector pointing away from neighbor
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| 173 | var delta = this.position - boids[i].position;
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| 174 | delta.length = 1 / distance;
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| 175 | steer += delta;
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| 176 | count++;
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| 177 | }
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| 178 | }
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| 179 | // Average -- divide by how many
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| 180 | if (count > 0)
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| 181 | steer /= count;
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| 182 | if (!steer.isZero()) {
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| 183 | // Implement Reynolds: Steering = Desired - Velocity
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| 184 | steer.length = this.maxSpeed;
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| 185 | steer -= this.vector;
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| 186 | steer.length = Math.min(steer.length, this.maxForce);
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| 187 | }
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| 188 | return steer;
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| 189 | },
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| 190 |
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| 191 | // Alignment
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| 192 | // For every nearby boid in the system, calculate the average velocity
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| 193 | align: function(boids) {
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| 194 | var neighborDist = 25;
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| 195 | var steer = new Point();
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| 196 | var count = 0;
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| 197 | for (var i = 0, l = boids.length; i < l; i++) {
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| 198 | var distance = this.distances[i];
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| 199 | if (distance > 0 && distance < neighborDist) {
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| 200 | steer += boids[i].vector;
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| 201 | count++;
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| 202 | }
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| 203 | }
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| 204 |
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| 205 | if (count > 0)
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| 206 | steer /= count;
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| 207 | if (!steer.isZero()) {
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| 208 | // Implement Reynolds: Steering = Desired - Velocity
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| 209 | steer.length = this.maxSpeed;
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| 210 | steer -= this.vector;
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| 211 | steer.length = Math.min(steer.length, this.maxForce);
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| 212 | }
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| 213 | return steer;
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| 214 | },
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| 215 |
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| 216 | // Cohesion
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| 217 | // For the average location (i.e. center) of all nearby boids,
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| 218 | // calculate steering vector towards that location
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| 219 | cohesion: function(boids) {
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| 220 | var neighborDist = 10000;
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| 221 | var sum = new Point(0, 0);
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| 222 | var count = 0;
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| 223 | for (var i = 0, l = boids.length; i < l; i++) {
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| 224 | var distance = this.distances[i];
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| 225 | if (distance > 0 && distance < neighborDist) {
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| 226 | sum += boids[i].position; // Add location
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| 227 | count++;
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| 228 | }
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| 229 | }
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| 230 | if (count > 0) {
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| 231 | sum /= count;
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| 232 | // Steer towards the location
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| 233 | return this.steer(sum, false);
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| 234 | }
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| 235 | return sum;
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| 236 | }
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| 237 | });
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| 238 |
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| 239 | var heartPath = Project.importJSON('["Path",{"pathData":"M514.69629,624.70313c-7.10205,-27.02441 -17.2373,-52.39453 -30.40576,-76.10059c-13.17383,-23.70703 -38.65137,-60.52246 -76.44434,-110.45801c-27.71631,-36.64355 -44.78174,-59.89355 -51.19189,-69.74414c-10.5376,-16.02979 -18.15527,-30.74951 -22.84717,-44.14893c-4.69727,-13.39893 -7.04297,-26.97021 -7.04297,-40.71289c0,-25.42432 8.47119,-46.72559 25.42383,-63.90381c16.94775,-17.17871 37.90527,-25.76758 62.87354,-25.76758c25.19287,0 47.06885,8.93262 65.62158,26.79834c13.96826,13.28662 25.30615,33.10059 34.01318,59.4375c7.55859,-25.88037 18.20898,-45.57666 31.95215,-59.09424c19.00879,-18.32178 40.99707,-27.48535 65.96484,-27.48535c24.7373,0 45.69531,8.53564 62.87305,25.5957c17.17871,17.06592 25.76855,37.39551 25.76855,60.98389c0,20.61377 -5.04102,42.08691 -15.11719,64.41895c-10.08203,22.33203 -29.54687,51.59521 -58.40723,87.78271c-37.56738,47.41211 -64.93457,86.35352 -82.11328,116.8125c-13.51758,24.0498 -23.82422,49.24902 -30.9209,75.58594z","strokeWidth":2,"strokeCap":"round"}]');
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| 240 | var pathLength = heartPath.length;
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| 241 |
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| 242 | var boids = [];
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| 243 | var groupTogether = false;
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| 244 |
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| 245 | // Add the boids:
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| 246 | for (var i = 0; i < 30; i++) {
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| 247 | var position = Point.random() * view.size;
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| 248 | boids.push(new Boid(position, 10, 0.05));
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| 249 | }
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| 250 |
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| 251 |
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| 252 | function onFrame(event) {
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| 253 | for (var i = 0, l = boids.length; i < l; i++) {
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| 254 | if (groupTogether) {
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| 255 | var length = ((i + event.count / 30) % l) / l * pathLength;
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| 256 | var point = heartPath.getPointAt(length);
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| 257 | if (point)
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| 258 | boids[i].arrive(point);
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| 259 | }
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| 260 | boids[i].run(boids);
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| 261 | }
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| 262 | }
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| 263 |
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| 264 | // Reposition the heart path whenever the window is resized:
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| 265 | function onResize(event) {
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| 266 | heartPath.fitBounds(view.bounds);
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| 267 | heartPath.scale(0.8);
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| 268 | pathLength = heartPath.length;
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| 269 | }
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| 270 |
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| 271 | function onMouseDown(event) {
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| 272 | groupTogether = !groupTogether;
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| 273 | }
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| 274 |
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| 275 | function onKeyDown(event) {
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| 276 | if (event.key == 'space') {
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| 277 | var layer = project.activeLayer;
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| 278 | layer.selected = !layer.selected;
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| 279 | return false;
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| 280 | }
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| 281 | }
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| 282 | </script>
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| 283 | <style>
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| 284 | body {
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| 285 | background: black;
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| 286 | }
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| 287 | </style>
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| 288 | </head>
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| 289 | <body>
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| 290 | <canvas id="canvas" resize></canvas>
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| 291 | </body>
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| 292 | </html> |
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