var angle = 0;

var speed = 0.03;

var speed1=5

var centerX = 300;

var centerY = 300;

function setup() { 

  createCanvas(600, 600);

}

​

function draw() { 

  background(100,200,50);

​

  var x = centerX + radius * cos(angle);

    var y = centerY + radius * sin(angle);

​

   if (overCircle(x, y, radius, radius)) { 

    x = x + random(-speed1*3, speed1);

    y = y + random(-speed1*3, speed1);

  }

  noStroke()

  ellipse(x, y, radius);

  angle = angle + speed;

}

​

function overCircle(x, y, radius) {

if (dist(x, y, mouseX, mouseY) < radius) {

      return true;  

    } else {

      return false; 

    }

​

}