createCanvas(600, 600);

}

​

function draw() {

  background(25);

  const NUM_GRID = 100;

  const W = width/(NUM_GRID);

  // Grid

  stroke(25);

  for(let i=0; i<NUM_GRID; i++) {

    line(i*W, 0, i*W, height);

  }

  for(let i=0; i<NUM_GRID; i++) {

    line(0, i*W, width, i*W);

  }

  // Circle

  let cx = NUM_GRID/2.0;

  let cy = NUM_GRID/2.0;

  let r = NUM_GRID*W/3;

  stroke(50)

  // circle(cx*W, cy*W, r*2);

}