CPSC120B
Fundamentals of Computer Science

Object Attributes

• Sprite objects have attributes for the x and coordinates of its location and for the image that is displayed when draw

• The values for these attributes come from when the sprite object is created

  a_sprite = sprite.Sprite(0, 0, 'sprite.gif')

• It is also possible to add attributes to an object

• For example, the speed of a sprite could be an attribute

  def update_sprite(a_sprite):
      a_sprite.y += a_sprite.speed_y
  
  a_sprite.speed_y = 1
  a_sprite = sprite.Sprite(0, 0, 'sprite.gif')

• This is useful for adding gravity, an acceleration

  def update_sprite(a_sprite):
      a_sprite.speed_y += GRAVITY
      a_sprite.y += a_sprite.speed_y
  
  
  a_sprite = sprite.Sprite(0, 0, 'sprite.gif')
  a_sprite.speed_y = 0
  
  while graphics.window_open():
      graphics.clear()
  
      update_sprite(a_sprite)
      graphics.draw_sprite(a_sprite)
  
      graphics.wait()

Activity