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// class Particle {// constructor() {// this.position = createVector(width / 2, height / 2); // start at center// this.velocity = createVector();// this.life = 100; // initial life value// this.genes = []; // array to store movement instructions// this.history = []; // to store the path// // generate initial movement instructions// for (let i = 0; i < this.life; i++) {// this.genes[i] = p5.Vector.random2D();// }// } // move() {// if (this.life > 0) {// // apply movement based on genes and life// this.velocity.add(this.genes[this.life-1]);// this.position.add(this.velocity);// this.life--;// // store the history// this.history.push(this.position.copy());// }// } // show() {// // display the particle// fill(255 * this.life/100);// noStroke();// ellipse(this.position.x, this.position.y, 5, 5);// } // evaluate() {// // calculate the residuals and sum of squared residuals// let sumOfSquaredResiduals = 0;// for (let i = 1; i < this.history.length; i++) {// let expectedPosition = p5.Vector.add(this.history[0], p5.Vector.mult(this.velocity, i));// let residual = p5.Vector.sub(expectedPosition, this.history[i]);// sumOfSquaredResiduals += residual.magSq();// }// // calculate the 'niceness' based on sum of squared residuals// let niceness = 1 / (1 + sumOfSquaredResiduals); // we add 1 to the denominator to prevent division by zero// this.life += niceness; // add to life based on niceness// }// breed(partner) {// let offspring = new Particle();// // combine this particle's genes with partner's genes// for (let i = 0; i < this.genes.length; i++) {// offspring.genes[i] = random() < 0.5 ? this.genes[i] : partner.genes[i];// // introduce a small chance for mutation// if (random() < 0.01) {// offspring.genes[i] = p5.Vector.random2D();// }// }// return offspring;// }// }// let particles = [];// function setup() {// createCanvas(700, 400);// background(0)// // spawn initial particles// for (let i = 0; i < 100; i++) {// particles[i] = new Particle();// }// }// function draw() {// background(0,0,0,0.1)// // move and show particles// for (let particle of particles) {// particle.move();// particle.show();// particle.evaluate();// }// // remove dead particles and replace with new ones// particles = particles.filter(particle => particle.life > 0);// // every certain number of frames, perform selection and breeding// if (frameCount % 200 == 0) {// // sort particles by life (niceness)// particles.sort((a, b) => b.life - a.life);// // take the top half of particles and breed them// let newParticles = []; // while (newParticles.length < 100) {// let partnerIndex = floor(random(particles.length / 3)); // choose a random partner from the top half// let partnerIndex2 = floor(random(particles.length / 3));// while (partnerIndex2 == partnerIndex){// partnerIndex2 = floor(random(particles.length / 2));// }// let offspring1 = particles[partnerIndex].breed(particles[partnerIndex2]);// newParticles.push(offspring1); // push both offspring into the new list// // particles.push(new Particle());// }// // replace old particles with new particles// particles = newParticles;// } // }