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

Name: Chladni Patterns (Basic)

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

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Connect with Patt: @pattvira

https://www.pattvira.com/

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*/

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let cols, rows; let size = 1;

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

​

function setup() {

  createCanvas(400, 400);

  cols = width/size;

  rows = height/size;

}

​

function draw() {

  background(220);

  noStroke();

  for (let i=0; i<cols; i++) {

    for (let j=0; j<rows; j++) {

      let x = map(i, 0, cols, 0, 1);

      let y = map(j, 0, rows, 0, 1);

      let val = chladni(x, y); 

      if (abs(val) < threshold) {

        fill(0);

      } else {

        fill(255);

      }

      rect(i*size, j*size, size, size);

    }

  }

  noLoop();

}

​

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);

}