createCanvas(600, 400);

  background(0);

}

​

function draw(){

  rectMode(CENTER);

​

  let distance = dist(mouseX, mouseY, 300, 200); // Calculate distance

​

  // Set color based on the distance

  if (distance < 25) {

    fill('blue'); // Inside the rectangle, turn blue

  } else {

    fill('green'); // Outside the rectangle, turn green

  }

​

  rect(300, 200, 50, 50); // Draw the rectangle

​

}