Frozen Brush (Deconstructed)

main.js
delaunay.js
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var allParticles = [];
var maxSplitCount = 3;
var useFill = true;
​
​
function Particle(x, y, splitCount) {
  
  this.splitCount = splitCount;
  this.age = 0;
  this.pos = new p5.Vector(x, y);
  this.vel = p5.Vector.random2D();
  this.vel.mult(map(this.splitCount, 0, maxSplitCount, 5, 2));
  
  this.move = function() {
    this.vel.mult(0.9);
    this.pos.add(this.vel);
    
    if (this.age % 10 == 0 && this.splitCount > 0) {
      allParticles.push(new Particle(this.pos.x, this.pos.y, this.splitCount - 1));
      this.splitCount -= 1;
    }
    
    this.age++;
  }
}
​
​
function setup() {
  createCanvas(windowWidth, windowHeight);
  colorMode(HSB, 360);
} 
​
​
function draw() {
  background(0);
  
  for (let i = allParticles.length - 1; i > -1; i--) {
    allParticles[i].move();
    
    if (allParticles[i].vel.mag() < 0.01) {
      allParticles.splice(i, 1);
    }
  }
  
  if (allParticles.length > 0) {
    let data = Delaunay.triangulate(
      allParticles.map(function(pt) {return [pt.pos.x, pt.pos.y];})
    );
    
    strokeWeight(0.5);
    
    let distThresh = 75;
    
    for (let i = 0; i < data.length; i += 3) {
      let particle1 = allParticles[data[i]];
      let particle2 = allParticles[data[i + 1]];
      let particle3 = allParticles[data[i + 2]];
      
      if (particle1.pos.dist(particle2.pos) > distThresh ||
          particle2.pos.dist(particle3.pos) > distThresh ||
          particle1.pos.dist(particle3.pos) > distThresh) {
        continue;
      }
      
      let particleColor = color(165 + particle1.age * 1.5, 360, 360);
      
      if (useFill) {
        fill(particleColor);
      } else {
        noFill();
      }
      
      stroke(particleColor);
      
      triangle(
        particle1.pos.x, particle1.pos.y, 
        particle2.pos.x, particle2.pos.y, 
        particle3.pos.x, particle3.pos.y);
    }
  }
}
​
​
function mouseDragged() {
  allParticles.push(new Particle(mouseX, mouseY, maxSplitCount));
}
​
​
function keyPressed() {
  useFill = !useFill;
}