apr18

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

int
  ballWayX = 1, // panašu į boolean (true / false)
  ballWayY = 1; // 1 (true) ; -1 (false)

void setup () {
  size (1280, 750);
  rectMode (CENTER);

  paddleX = width * 0.5; // per vidurį
  paddleY = height * 0.95; // apačioje

  paddleW = width * 0.125;
  //paddleW = width;
  paddleH = height * 0.03;

  ballSize = height * 0.1;
  paddleStep = ballStep = width * 0.01;
  //ballStep = width * 0.008;
  // 1280 * 0.01 = 12.8

  //paddleX = width / 2;
  //ballX = paddleX - paddleW / 2;
  //paddleY = height / 2;
  //ballY = paddleY - paddleH * 2;
  //circle (ballX, ballY, ballSize);
  //rect (paddleX, paddleY, paddleW, paddleH);
  //println ("paddleY: " + str(paddleY));

  //paddleX = 0;
  //noStroke ();
  //stroke (50, 50, 50); // rgb
  //strokeWeight (50);
}

void paddle () {
  fill (255, 0, 0);
  rect (paddleX, paddleY, paddleW, paddleH);

  if (keyPressed) {
    //if (key == 'a')
    if (keyCode == LEFT && paddleX > 0)
      paddleX -= paddleStep;
    if (keyCode == RIGHT && paddleX < width)
      paddleX += paddleStep;
  }
}

void ball () {
  //fill (255);
  fill (random (255), random (255), random (255));

  ballX += ballStep * ballWayX;
  ballY += ballStep * ballWayY;
  println (ballY);

  // ballStep 13; -13
  //if (true)
  //if (ballY > height / 2)

  // atsimuša nuo dešinės ir kairės
   if (ballX > width || ballX < 0)
      //atsimuša
      ballWayX *= -1;
      // 1 -> -1
      // -1 -> 1

   if (ballY < 0)
     ballWayY = 1;

  if (ballY + ballSize / 2 > paddleY - paddleH / 2){
    if (
     ballX > paddleX - paddleW / 2
     //ball dešiniau nei kairys paddle kraštas (x)
     &&
     ballX < paddleX + paddleW / 2
     // ball kairiau nei dešinys paddle kraštas (x)
    ) {
      ballWayY = -1;
      //fill (0, 255, 0);
      //stop ();
    }
  }

  if (ballY > height)
    stop ();

  circle (ballX, ballY, ballSize);
}

void draw () {
  background (0);
  paddle ();
  ball ();
}