var diameter;



function setup() {

  createCanvas(windowWidth,

               windowHeight);

  background(700, 700, 700);

  frameRate(10);

  noStroke();

  noFill();



  diameter = 150;

}



function draw() {

  fill(0, 0, 0);

  text("画面ををタップ！！", 50, 50);



  if (mouseIsPressed) {

    stroke(70, 150, 20, 60);

    noFill();

    translate(mouseX, mouseY);

    for (var i = 0; i < TWO_PI; i += 0.1) {

      var x = diameter * cos(i);

      var y = diameter * sin(i);

      ellipse(x, y, 450);

    }

  }

}