createCanvas(500, 500);

  background(205);

​

  art = color(0);

  b = color(0, 0, 255);

  r = color(255, 0, 0);

  g = color(0, 255, 0);

}

let r, g, b, l;

let nothing;

​

function draw() {

  noStroke();

  fill(0, 0, 255);

  circle(30, 40, 15);

​

  fill(255, 0, 0);

  circle(50, 40, 15);

​

  fill(0, 255, 0);

  circle(70, 40, 15);

​

  fill(255);

  square(85, 33, 15); //eraser

​

  if (mouseIsPressed) {

    stroke(art);

    strokeWeight(10);

    line(mouseX, mouseY, pmouseX, pmouseY);

  }

}

​