​

// Modified to be oddly satisfying

​

let xspacing = 16; // Distance between each horizontal location

let w; // Width of entire wave

let theta = 0.0; // Start angle at 0

let amplitude = 75.0; // Height of wave

let period = 500.0; // How many pixels before the wave repeats

let dx; // Value for incrementing x

let yvalues; // Using an array to store height values for the wave

let fps = 30;

​

function setup() {

  createCanvas(windowWidth, windowHeight);

​

  w = width + 16;

  dx = (TWO_PI / period) * xspacing;

  yvalues = new Array(floor(w / xspacing));

​

  // remap amplitude as ratio to window height

  amplitude = map(amplitude, 0, 350, 0, windowHeight);

​

  frameRate(fps);

}

​

function draw() {

  background(0);

  calcWave();

  renderWave();

}

​

function calcWave() {

  // Increment theta (try different values for

  // 'angular velocity' here)

  theta += 0.02;

  // For every x value, calculate a y value with sine function

  let x = theta;

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

    yvalues[i] = sin(x) * amplitude;

    x += dx;

  }

}

​

function renderWave() {

  noStroke();

  fill(255);

  // A simple way to draw the wave with an ellipse at each location

  for (let x = 0; x < yvalues.length; x++) {

    let s1;

    let s2;

    if ((x % 2) == 0) {

      s1 = 1;

      s2 = 5;

    } else {

      s1 = 5;

      s2 = 1;

    }

    // avoid re-calculating

    let _x = x*xspacing;

    // top line

    strokeWeight(s1);

    stroke(map(x,0,yvalues.length,255,0));

    line(_x,height/2+yvalues[x],_x,0);

    // bottom line

    stroke(map(x,0,yvalues.length,0,255));

    strokeWeight(s2);

    line(_x,height/2+yvalues[x],_x,height);

    // circle

    stroke(0);

    strokeWeight(1);

    ellipse(_x, height / 2 + yvalues[x], 8, 8);   

  }

}