class Player
{
  int x, y, r, speed;
  
  Player (int ix, int iy, int ir, int is)
  {
    x = ix;
    y = iy;
    r = ir;
    speed = is;
  }
  
  void move()
  {
    if ( keyCode == UP ) y -= speed;
    if ( keyCode == DOWN ) y += speed;
    if ( keyCode == LEFT ) x -= speed;
    if ( keyCode == RIGHT ) x += speed;
    x = constrain(x, 5, width-5);
    y = constrain(y, 5, height-5);
  }
  
  void render()
  {
    stroke(200);
    fill(0, 0, 255);
    rect(x, y, r, r);
  }
  
  void speedUp()
  {
    speed = constrain(speed+1, 1, 10);
    println("Speed increased to " + speed + ".");
  }
  
  void slowDown()
  {
    speed = constrain(speed-1, 1, 10);
    println("Speed decreased to " + speed + ".");
  }
}