let redVal = 0;

​

function setup() {

  createCanvas(400, 400);

}

​

function draw() {

  if(redVal > 0) {

    background(redVal, 0, 0);

  } else {

    background(0, 200, 240);

  }

  fill(0, 200, 24);

  stroke(255, 100, 0);

  strokeWeight(15);

  point(mouseX, mouseY);

  strokeWeight(6);

  y = y + 1;

  let rnd = round(random(1, 3));

  let onGround = y > height;

  if(onGround) {

    y = 0;

    if(rnd == 1) {

      redVal = 200;

    } else if(rnd == 2) {

      redVal = 100;

    } else {

      redVal = 255;

    }

  }

  ellipse(mouseX, y, 56, 56);

  rect(300, 300, 100, 100);

  line(mouseX, mouseY, 300, 300);

  line(mouseX, mouseY, 300, 400);

  line(mouseX, mouseY, 400, 300);

}