Sabit hizli hareket

void setup() {

  size(600, 400);

  ellipse(50, 50, 60, 60);
}

int xPosition = 100;
int yPosition = 100;
int t = 0;
int vX = 3;
int vY = 3;
boolean enteredFrame = true;

// x(t) = x0 + v * t;
void draw() {
  background(255);


  xPosition = xPosition + vX;
  yPosition = yPosition + vY;


  ellipse(xPosition, yPosition, 60, 60);

  if (xPosition + 30 > width || xPosition - 30 < 0 ) {
     vX = vX * -1;
  }

  if (yPosition + 30 > height || yPosition - 30 < 0) {
    //noLoop();
      vY = vY * -1;
    }
}