Brush 1

var ox, oy, nx, ny, spd, spd0, spd00, spd00, spd000, spd0000;

var angle = 0, oldAngle = 0, angleDiff, weight, theCanvas;

​

function setup() {

  theCanvas = createCanvas(windowWidth, windowHeight);

  colorMode(HSB,360,100,100,1);

  noFill();

  initSketch();

}

​

function draw() {

}

​

function initSketch() {

  background(240);

  ox = undefined;

  oy = undefined;

}

​

function mouseClicked() {

  weight = 24;

  spd0 = 1;

  spd00 = 1;

  spd000 = 1;

  spd0000 = 1;

  ox = undefined;

  oy = undefined;

}

​

function mouseDragged() {

  var adj = 0;

  var minWeight = 2;

  var maxWeight = 30;

  var weightIncrement = 4;

  var num,size,distance;

  if (typeof ox === 'undefined') {

    ox = mouseX;

    oy = mouseY;

  }

  nx = mouseX;

  ny = mouseY;

  spd = dist(ox, oy, nx, ny) ;

  avgSpd = (spd + spd0 + spd00 + spd000 + spd0000) / 5;

  if (between(avgSpd,1,2)) { weight += (weightIncrement * 2) }

  if (between(avgSpd,3,5)) { weight += (weightIncrement) }

  if (between(avgSpd,6, 40)) { weight -= weightIncrement }

  if (between(avgSpd,61,999)) { weight -= (weightIncrement * 2) }

  if(avgSpd < 1) { weight += 1 }

​

  weight = Math.max(weight, minWeight);

  weight = Math.min(weight, maxWeight);

  stroke(0, 250);

  strokeWeight(weight);

  line(ox, oy, nx, ny);

  // spatter:

  angle = atan2(ny - oy, nx - ox);

  angleDiff = abs(angle, oldAngle); 

  push();

  noStroke();

  fill(0,0.5);

  num = Number(angleDiff > 1);

  distance = spd * random(1);

  for(let i = 0; i < 4; i++) {

    size = random(0.5, distance / 8);

    ellipse(wobble(nx, distance), wobble(ny, distance), size, size);

  }

  pop();

  // Remember values next time:

  oldAngle = angle;

  ox = nx;

  oy = ny;

  spd0000 = spd000;

  spd000 = spd00;

  spd00 = spd0;

  sped0 = spd;

}

​

function keyPressed() {

  // (E)rase:

  if (keyCode === 69) {

    initSketch();

  }

  // (S)ave

  if (keyCode === 83) {

    var title = window.title || 'untitled';

    var filename = title + '-' + Date.now();

    saveCanvas(theCanvas, filename, 'PNG');

  }

  // (B)lur

  if (keyCode === 66) {

    filter(BLUR,4);

  }

}

​

function wobble(num, mag) {

  return random(0 - mag, mag) + num;

}

​

function between(num, a, b) {

  return(num >= a && num <= b);

}