scripts

src/alieninvasion.py

@@ -1,27 +1,69 @@
+import sys
 import pygame
+from settings import Settings
+from ship import Ship
 
 
 class AlienInvasion:
-
+	"""Parent class to manage game behavior"""
+
 	def __init__(self):
+
 		pygame.init()
 
-		self.screen = pygame.display.set_mode((1200, 800))
-		pygame.display.set_caption("Alien Invasion")
+		self.settings = Settings()
+
+		self.screen = pygame.display.set_mode((0, 0), pygame.FULLSCREEN)
+		self.settings.screen_width = self.screen.get_rect().width
+		self.settings.screen_height = self.screen.get_rect().height
+
 		self.bg_color = (230, 230, 230)
+		pygame.display.set_caption("Alien Invasion")
+		self.ship = Ship(self)
+
 
 	def run_game(self):
 
 		while True:
-			for event in pygame.event.get():
-				if event.type == pygame.QUIT:
-					sys.exit()
-
-			#Update screen
-			self.screen.fill(self.bg_color)
-			pygame.display.flip()
+			self._check_events()
+			self.ship.update()
+			self._update_screen()
+
+
+	def _check_events(self):
+
+		for event in pygame.event.get():
+			if event.type == pygame.QUIT:
+				sys.exit()
+			elif event.type == pygame.KEYDOWN:
+				self._check_keydown_events(event)
+			elif event.type == pygame.KEYUP:
+				self._check_keyup_events(event)
+
+
+	def _check_keydown_events(self, event):
+		if event.key == pygame.K_RIGHT:
+			self.ship.moving_right = True
+		elif event.key == pygame.K_LEFT:
+			self.ship.moving_left = True
+		elif event.key == pygame.K_q:
+			sys.exit()
+
+
+	def _check_keyup_events(self, event):
+		if event.key == pygame.K_RIGHT:
+			self.ship.moving_right = False
+		elif event.key == pygame.K_LEFT:
+			self.ship.moving_left = False
+
+
+	def _update_screen(self):
+		self.screen.fill(self.settings.bg_color)
+		self.ship.blitme()
+		pygame.display.flip()
 
 
 if __name__ == "__main__":
+
 	ai = AlienInvasion()
 	ai.run_game()

src/bullet.py

@@ -0,0 +1,19 @@
+import pygame
+from pygame.sprite import Sprite
+
+
+class Bullet(Sprite):
+	"""Projectiles fired from ship. The Bullet class inherits from Sprite, which we import from the pygame .sprite module. When you use sprites, you can group related elements in your game and act on all the grouped elements at once. To create a bullet instance, __init__() needs the current instance of AlienInvasion, and we call super() to inherit properly from Sprite."""
+
+	def __init__(self, ai_game):
+
+		super().__init__()
+		self.screen = ai_game.screen
+		self.settings = ai_game.settings
+		self.color = self.settings.bullet_color
+
+		self.rect = pygame.Rect(0, 0,
+			self.settings.bullet_width, self.settings.bullet_height)
+		self.rect.midtop = ai_game.ship.rect.midtop
+
+		self.y = float(self.rect.y)

src/settings.py

@@ -0,0 +1,15 @@
+class Settings:
+	"""Settings for Alien Invasion"""
+
+	def __init__(self):
+
+		self.screen_width = 1200
+		self.screen_height = 800
+		self.bg_color = (230, 230, 230)
+		#Ship
+		self.ship_speed = 1.5
+		#Bullets
+		self.bullet_speed = 1.
+		self.bullet_width = 3
+		self.bullet_height = 15
+		self.bullet_color = (60, 60, 60)

src/ship.py

@@ -0,0 +1,40 @@
+import pygame
+from os.path import dirname, abspath, join
+
+#Parent directory
+path = dirname(dirname(abspath(__file__)))
+
+class Ship:
+	"""The player's ship"""
+
+	def __init__(self, ai_game):
+
+		self.screen = ai_game.screen
+		self.settings = ai_game.settings
+		self.screen_rect = ai_game.screen.get_rect()
+
+		self.image = pygame.image.load(join(path, "img", "ship.bmp"))
+		self.rect = self.image.get_rect()
+		self.rect.midbottom = self.screen_rect.midbottom
+
+		#Decimal value for ship's horizontal position
+		self.x = float(self.rect.x)
+
+		# Movement flags
+		self.moving_right = False
+		self.moving_left = False
+
+
+	def update(self):
+
+		if self.moving_right and self.rect.right < self.screen_rect.right:
+			self.x += self.settings.ship_speed
+		if self.moving_left and self.rect.left > 0:
+			self.x -= self.settings.ship_speed
+
+		self.rect.x = self.x
+
+
+	def blitme(self):
+		"""Draw ship at new loaction"""
+		self.screen.blit(self.image, self.rect)