​

let circR = 40;

let outlR = 80;

​

function setup() {

  createCanvas(400, 400);

}

​

function draw() {

  background(20);

  if (circR <= 0) return;

  push();

  translate(width/2, height/2);

  fill(255);

  noStroke();

  ellipse(0, 0, circR);

  noFill();

  drawingContext.setLineDash([outlR/5, outlR/5]);

  stroke(255);

  strokeWeight(4);

  if (outlR > 0) ellipse(0, 0, outlR);

  pop();

  if (shrink) {

    if (outlR+4 < circR) {

      circR -=2;  

    } else {

    }

    outlR -= 2;

  }

}

​

function mousePressed() {

  shrink = true;

}