// Daniel Shiffman

// https://thecodingtrain.com/CodingChallenges/132-fluid-simulation.html

// https://youtu.be/alhpH6ECFvQ

​

// This would not be possible without:

// Real-Time Fluid Dynamics for Games by Jos Stam

// http://www.dgp.toronto.edu/people/stam/reality/Research/pdf/GDC03.pdf

// Fluid Simulation for Dummies by Mike Ash

// https://mikeash.com/pyblog/fluid-simulation-for-dummies.html

​

let fluid;

​

function setup() {

  createCanvas(600, 600);

  frameRate(22);

  fluid = new Fluid(0.2, 0, 0.0000001);

}

​

function draw() {

  stroke(51);

  strokeWeight(2);

​

  let cx = int((0.5 * width) / SCALE);

  let cy = int((0.5 * height) / SCALE);

  for (let i = -1; i <= 1; i++) {

    for (let j = -1; j <= 1; j++) {

      fluid.addDensity(cx + i, cy + j, random(50, 150));

    }

  }

​

  for (let i = 0; i < 2; i++) {

    let angle = noise(t) * TWO_PI * 2;

    let v = p5.Vector.fromAngle(angle);

    v.mult(0.2);

    t += 0.01;

   fluid.addVelocity(cx, cy, v.x, v.y);

  }

  fluid.step();

  fluid.renderD();

}