createCanvas(700, 600);

  background(100);

  colorMode(HSB);

}

​

function draw() {

  //background(220);

  let hue = map(mouseX, 0, width, 0, 360);

  fill(hue, 80, 80, 0.4);

  noStroke();

  let diameter = dist(mouseX, mouseY, pmouseX, pmouseY);

  if(mouseIsPressed==true){

    circle(mouseX, mouseY, diameter);

  }

}

​

function keyPressed(){

  colorMode(RGB);

  background(100);

  colorMode(HSB);

}