DragonRuby Game Toolkit Tutorial - Galaga clone...a new beginning

main.rb

# the first 2 or 4 values of the primitive conventionally are x, y, (w, h, or x2, y2)
# the last 4 values conventionally are r, g, b, a (color)
# custom values for primitive are in the middle
# labels    x, y, text, size, alignment, r, g, b, a
# sprites   x, y, w, h, path, angle, alpha
# lines     x, y, x1, y1, r, g, b, a
# solids    x, y, w, h, r, g, b, a
# borders   x, y, w, h, r, g, b, a
# sounds    ".wav|.ogg"

def defaults game_state
  game_state.game.ship_x ||= game_state.grid.w_half - 33
end

def render game_state
  game_state.outputs.labels << [ game_state.grid.w_half, game_state.grid.h - 10, "Galaga", 1, 1, 0, 0, 255, 255]
  game_state.outputs.sprites << [ game_state.game.ship_x, 10, 66, 66, "ship_blue.png", 90]
  if game_state.game.bullet_x
    game_state.outputs.sprites << [ game_state.game.bullet_x, game_state.game.bullet_y, 10, 10, "blue_bullet.png"]
  end
end

def calc game_state
  if game_state.game.bullet_x
    game_state.game.bullet_y += 8
    if game_state.game.bullet_y > game_state.grid.h
      game_state.game.bullet_x = game_state.game.bullet_y = nil
    end
  end
  game_state.game.ship_x -= game_state.grid.w if game_state.game.ship_x >= game_state.grid.w
  game_state.game.ship_x += game_state.grid.w if game_state.game.ship_x <= 0
end

def inputs game_state
  if game_state.inputs.controller_one.key_held.right
    game_state.game.ship_x += 10
  elsif game_state.inputs.controller_one.key_held.left
    game_state.game.ship_x -= 10
  end

  if ( game_state.inputs.controller_one.key_down.a ||
       game_state.inputs.controller_one.key_down.b ) && !game_state.game.bullet_x
    game_state.game.bullet_x = game_state.game.ship_x + 28
    game_state.game.bullet_y = 76
  end
end


def tick game_state
  defaults game_state
  render game_state
  calc game_state
  inputs game_state  
end