var x,y;

​

function setup() {

  createCanvas(400, 400);

  x = width/2;

  y = height/2;

}

​

function draw() {

  background(220);

  ellipse(x,y,40,40);

  prob = random(0,8); //(0,8) is a high enough number to make sure the cats move sporadically instead of every animation frame. try changin 8 to different numbers and see what happens

  if(prob<0.25){

    x+=10;

  } else if(prob<0.50){

    x-=10;

  } else if(prob<0.75){

    y+=10;

  } else if(prob<1){

    y-=10;

  }

  x=constrain(x,0,width);

  y=constrain(y,0,width);

}