engine: Added tiled image

The tiled image function will return a surface the size of the screen
with the given image tiled on it.

engine/image.py

@@ -2,11 +2,31 @@
 
 import pygame
 import os
+import screen
 
 load_img = pygame.image.load
 join     = os.path.join
+scr_size = screen.size
+draw     = screen.draw
 
 def load(game, image):
 	path = join( join("images", game), image )
 	img  = load_img(path)
 	return img.convert_alpha()
+
+def render_tiled(image):
+	(w, h)   = image.get_size()
+	(sw, sh) = scr_size()
+	for i in xrange(sw / w):
+		for j in xrange(sh / h):
+			draw(image, w * i, h * j)
+
+def tiled_image(game, image_file):
+	image    = load(game, image_file)
+	(w, h)   = image.get_size()
+	(sw, sh) = scr_size()
+	surf     = pygame.Surface((sw, sh))
+	for i in xrange( (sw / w) + 1 ):
+		for j in xrange( (sh / h) + 1 ):
+			surf.blit(image, (w * i, h * j))
+	return surf.convert()

games/spaceblaster/arcade.py

@@ -5,6 +5,8 @@ import games
 
 import ship
 import enemy
+from engine.screen import draw
+from engine.image  import tiled_image
 
 RIGHT = pygame.K_RIGHT
 LEFT  = pygame.K_LEFT
@@ -17,6 +19,7 @@ B     = pygame.K_b
 class ArcadeState(games.GameState):
 	def __init__(self, GAME):
 		self.ship  = ship.CSE1670(GAME, (10, 10), (0.7, 0.7))
+		self.stars = tiled_image(GAME, "stars.png")
 		self.fire_interval = 100
 		self.beams   = []
 		self.enemies = [enemy.Trilord(GAME, (10, 10))]
@@ -27,6 +30,8 @@ class ArcadeState(games.GameState):
 		self.k_space = False
 
 	def render(self):
+		draw(self.stars, 0, 0)
+		#render_tiled(self.stars)
 		for beam in self.beams:
 			beam.render()
 		for enemy in self.enemies:
@@ -61,6 +66,7 @@ class ArcadeState(games.GameState):
 			beam.move()
 			if beam.is_offscreen():
 				self.beams.remove(beam)
+
 		for enemy in self.enemies:
 			collide = enemy.collide
 			for beam in self.beams: