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229 lines
6.1 KiB
HTML
229 lines
6.1 KiB
HTML
5 years ago
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<!doctype html>
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<html>
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<head>
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<title>canvas.js | basics (2)</title>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
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<script type="text/javascript" src="../../pattern/canvas.js"></script>
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</head>
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<body>
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<script type="text/canvas">
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/* canvas.js includes a Class object useful for OO-style programming.
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* This example demonstrates classes (Food, Pheromone, Ant, Colony)
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* for building an ant colony simulation.
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* The class syntax is as follows:
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*
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* var Person = Class.extend({
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* init: function(name) {
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* this.name = name;
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* },
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* greet: function() {
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* return "Hello, my name is " + this.name;
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* }
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* });
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*
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* var p = new Person("Aunt Hillary");
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*
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* Note the comma between class methods.
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*/
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function distance(v1, v2) {
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return Math.sqrt(Math.pow(v1.x-v2.x, 2) + Math.pow(v1.y-v2.y, 2));
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}
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var Food = Class.extend({
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init: function(x, y, amount) {
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this.x = x;
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this.y = y;
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this.amount = amount;
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}
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});
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var Pheromone = Class.extend({
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init: function(x, y) {
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this.x = x;
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this.y = y;
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this.strength = 1.0;
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},
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evaporate: function(m) {
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this.strength *= (this.strength > 0.01)? (m || 0.995) : 0;
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}
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});
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var Ant = Class.extend({
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init: function(colony, x, y) {
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this.colony = colony;
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this.x = x;
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this.y = y;
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this.v = {x:0, y:0};
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this.food = false;
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this.trail = [];
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this.roaming = random(100);
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},
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goal: function(x, y) {
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/* Sets the current position to move towards.
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*/
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var d = distance(this, {x:x,y:y}) + 0.0001;
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this.v.x = (x - this.x) / d;
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this.v.y = (y - this.y) / d;
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this.roaming = 0;
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},
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roam: function(m) {
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/* Roam around freely.
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* Eventually, the ant returns to the colony to start a new roaming cycle.
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*/
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this.v.x += random(-m, m);
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this.v.y += random(-m, m);
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this.roaming += 1;
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if (this.roaming > this.colony.radius) {
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this.goal(this.colony.x, this.colony.y);
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}
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if (distance(this, this.colony) < 10) {
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this.roaming = 0;
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}
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},
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track: function() {
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/* Follow nearby trails, from pheromone to pheromone.
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* If the trail has evaporated too much, the ant may lose interest.
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*/
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for (var i=0; i < this.colony.ants.length; i++) {
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for (var j=0; j < this.colony.ants[i].trail.length; j++) {
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var pheromone = this.colony.ants[i].trail[j];
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if (distance(this, pheromone) < pheromone.strength * 30) {
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if (random() < pheromone.strength) {
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this.goal(pheromone.x, pheromone.y);
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}
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return;
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}
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}
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}
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},
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harvest: function() {
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/* Collect nearby food.
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* Mark the food source with pheromones for other ants.
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*/
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for (var i=0; i < this.colony.foodsources.length; i++) {
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var food = this.colony.foodsources[i];
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if (distance(this, food) < Math.max(1, food.amount/2)) {
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food.amount -= 1;
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if (food.amount <= 0) {
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this.colony.foodsources.splice(i, 1);
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}
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this.trail = [];
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this.trail.push(new Pheromone(food.x, food.y));
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this.trail.push(new Pheromone(this.x, this.y));
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this.food = true;
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}
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}
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},
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hoard: function(m) {
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/* Return home with food.
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* Mark the trail with pheromones for other ants.
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*/
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this.goal(this.colony.x, this.colony.y);
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if (random() < (m || 0.5)) {
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this.trail.push(new Pheromone(this.x, this.y));
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}
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if (distance(this, this.colony) < 5) {
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this.food = false;
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this.colony.food += 1;
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}
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},
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forage: function() {
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if (this.food === false) {
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this.roam(0.3); // 1) Roam around.
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this.track(); // 2) Follow trails to food.
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this.harvest(); // 3) Pick up food and mark source.
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} else { // 4) Bring food home + mark trail.
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this.hoard();
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}
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this.v.x = Math.clamp(this.v.x, -1, +1);
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this.v.y = Math.clamp(this.v.y, -1, +1);
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this.x += this.v.x;
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this.y += this.v.y;
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// Evaporate trail.
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for (var i=0; i < this.trail.length; i++) {
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var pheromone = this.trail[i];
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pheromone.evaporate();
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if (pheromone.strength === 0) {
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this.trail.splice(i, 1);
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}
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}
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}
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});
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var Colony = Class.extend({
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init: function(x, y, radius, size) {
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this.x = x;
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this.y = y;
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this.radius = radius;
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this.foodsources = [];
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this.food = 0;
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this.ants = [];
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for (var i=0; i < size; i++) {
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this.ants.push(new Ant(this, x, y));
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}
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}
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});
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function setup(canvas) {
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canvas.size(600, 300);
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// Create a fancy gradient background image.
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terrain = render(function() {
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rect(0, 0, 600, 300, {
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fill: new Gradient(new Color(0.25,0.35,0.10), new Color(0.10,0.15,0.05), {
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x: 300,
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y: 150,
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spread: 250,
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type: RADIAL
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})
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});
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}, 600, 300);
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// Create a colony with 20 ants and 10 food sources.
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colony = new Colony(300, 150, 200, 20);
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for (var i=0; i < 10; i++) {
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colony.foodsources.push(
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new Food(random(30,-30 + canvas.width),
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random(30,-30 + canvas.height),
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random(20, 50)));
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}
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}
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function draw(canvas) {
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canvas.clear();
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// 1) Draw pre-rendered terrain.
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image(terrain);
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// 2) Draw the hoarded food in the colony.
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fill(1, 0.1);
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ellipse(colony.x, colony.y, colony.food, colony.food);
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// 3) Draw food sources.
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fill(0, 0.4);
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Array.enumerate(colony.foodsources, function(i, food) {
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ellipse(food.x, food.y, food.amount, food.amount);
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});
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// 4) Draw ant trails.
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var p = new BezierPath();
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Array.enumerate(colony.ants, function(i, ant) {
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Array.enumerate(ant.trail, function(i, pheromone) {
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if (i === 0) {
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p.moveto(pheromone.x, pheromone.y);
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} else {
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p.lineto(pheromone.x, pheromone.y);
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}
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});
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});
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drawpath(p, {stroke: new Color(1, 0.2), strokewidth: 0.5, fill: null});
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// 5) Draw ants: roaming = white, hoarding = green.
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Array.enumerate(colony.ants, function(i, ant) {
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ant.forage();
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if (ant.food) {
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fill(0.5, 1, 0);
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} else {
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fill(1, 0.4);
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}
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ellipse(ant.x, ant.y, 3, 3);
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});
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}
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</script>
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</body>
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</html>
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