Author: stickz

I was interested in creating a line that expresses a human-like scribble that has the stroke appearance of a 0.5mm ball point pen. I messed around with sine and cosine functions that ended up creating anelliptical, vortex-like, scribble that has a direction that varies with noise, where a new drawing is constantly generated (hitting the spacebar starts and stops the generating of new drawings) 

//applies the noise function in creating randomness
// Uses https://github.com/zenozeng/p5.js-svg to export SVG.

var bExportSvg = false;
var runDrawing = true;

function setup() {
  createCanvas(600, 600, SVG);
}

function draw() {
  if (runDrawing == true) {
    background(230);
    if (bExportSvg) clear();
    strokeWeight(0.2);
    noFill();

    var cx = width / 2;
    var cy = height / 2;
    var px = cx;
    var py = cy;

    var direction = random(PI / 2, PI);

    beginShape();

    for (var i = 0; i < 2000; i++) {
      var increment = 3 + noise(i / 1000);
      var displacementX = px - cx;
      var displacementY = py - cy;
      var offset = max(3, sqrt(displacementX ** 2 + displacementY ** 2) / 20);
      increment *= 0.7 * offset;
      direction += radians(50 * (noise(i) - 10));

      px += 5 * noise(i) * increment * cos(200 * direction);
      py += 5 * noise(i) * increment * sin(200 * direction);

      var pointX = cx + displacementX * offset ** -0.8;
      var pointY = cy + displacementY * offset ** -0.8;

       
      vertex(pointX, pointY);
    }

    endShape();
    var seed = millis()**0.5;
    randomSeed(seed);
    noiseSeed(seed); //random noise value generated for each drawing coordinated with the seconds function, inspired by Golan Levin's Linewalk
    loop();
  }
  if (bExportSvg) {
    saveSVG("stickz_line_on_a_walk.svg");
    bExportSvg = false;
  } 
}

function keyPressed() {
  if (key == "s") {
    bExportSvg = true;
    loop();
  }
  if (keyCode === 32) { //if SPACEBAR is pressed, pause drawing
    if (runDrawing == false) runDrawing = true;
    else runDrawing = false;
  }
}

link to code