apr19

float
  // ball
    ballX = 0,
    ballY = 0,
    ballSize, // diametras
    ballStep,
  // paddle
    paddleX,
    paddleY,
    paddleW,
    paddleH,
    paddleStep;

void setup () {
  size (1280, 740);
  rectMode (CENTER);

  ballSize = height * 0.1;
  ballStep = width * 0.01;

  paddleX = width * 0.5;
  paddleY = height * 0.95;
  paddleW = width * 0.125;
  paddleH = height * 0.03;
  paddleStep = width * 0.01;

  //circle (ballX, ballY, ballSize);
  rect (paddleX, paddleY, paddleW, paddleH);
}

void ball () {
  // kamuolio judėjimas
  ballX += ballStep;
  ballY += ballStep;

  if (ballY > height)
    stop ();

  fill (255);
  if (ballY + ballSize / 2 > paddleY - paddleH / 2) {
    // pažymiu, kad yra kamuolio kontaktas su paddle
    fill (0, 255, 0);
    stop ();
  }
  circle (ballX, ballY, ballSize);
}

void draw () {
  ball ();
}