----- Coding Tutorial by Patt Vira ----- 

Name: Chladni Patterns (Particles)

Video Tutorial: https://youtu.be/J-siGcsK2k8

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Connect with Patt: @pattvira

https://www.pattvira.com/

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let particles = []; let num = 5000;

let m = 5; let n = 4; let threshold = 0.05;

let minMN = 1; let maxMN = 6;

let changePattern = true;

let margin = 50; let w1, w2, h1, h2;

let scl = 1;

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function setup() {

  createCanvas(400, 400);

  w1 = margin; w2 = width - margin;

  h1 = margin; h2 = height - margin;

  for (let i=0; i<num; i++) {

    particles.push(new Particle());

  }

}

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function draw() {

  background(0);

  if (changePattern) {

    randomPatterns();

  }

  for (let i=0; i<particles.length; i++) {

    particles[i].update();

    particles[i].display();

  }

}

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function chladni (x, y) {

  let L = 1;

  return cos(n * PI * x / L) * cos(m * PI * y / L) - 

         cos(m * PI * x / L) * cos(n * PI * y / L);

}

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function randomPatterns() {

  m = floor(random(minMN, maxMN));

  n = floor(random(minMN, maxMN));

  if (m === n) {

    m = floor(random(minMN, maxMN));

  }

  changePattern = false;

  for (let i=0; i<particles.length; i++) {

    particles[i].velocity = p5.Vector.random2D().mult(random(2, 5));

  }

}

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function mousePressed() {

  changePattern = true;

}

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