let x = 200;

let y = 200;

let xJump = 4;

let yJump = -3;

​

function setup() {

  createCanvas(400, 400);

    rectMode(CENTER);

}

 function draw() {

  background(220);

  noFill();

  stroke(1);

  quad(80, 120, 320, 120, 265, 400, 130, 400);

​

  ellipse(x,y,rSize,rSize);

  x = x + xJump;

  y = y + yJump;

  if(x >= width-rSize/2 || x <= rSize/2) {

    xJump = xJump * -1;

    fill(0,0,0);  

  }

    if(y >= height-rSize/2 || y <= rSize/2) {

    yJump = yJump * -1;

    fill(0,0,0);

  }  

​

}

​