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////HAVE FUN WRITING!

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function setup () {

  createCanvas(windowWidth,windowHeight);

  background(255);

}

​

function draw() {

  let now = createVector(mouseX, mouseY);

  let prev = createVector(pmouseX, pmouseY);

  let delta = now.dist(prev);

  let a = map(delta, 0, 40, 50, 240);

  if(a>240){a=240};

  noStroke();

  fill(a,240);

  if(mouseIsPressed) {

    quad(now.x, now.y, now.x+30, now.y-15, prev.x+30, prev.y-15, prev.x, prev.y);

  }

}

​

function keyPressed(){

  if(keyCode==32){

    background(255);

  }

}