spaceblaster: Use a fire interval rather than key repeating

Checking when keys are pressed or released is better than using the
key_repeat abilities of pygame.  We should use this, and then wait 50 ms
between each beam.

engine/__init__.py

@@ -13,7 +13,6 @@ def init():
 	pygame.init()
 	print "Initializing engine"
 	screen.init()
-	pygame.key.set_repeat(50, 50)
 
 def quit(event, ms):
 	screen.quit()

games/spaceblaster/arcade.py

@@ -14,6 +14,7 @@ SPACE = pygame.K_SPACE
 class ArcadeState(games.GameState):
 	def __init__(self, GAME):
 		self.ship  = ship.CSE1670(GAME, (10, 10), (1, 1))
+		self.fire_interval = 0
 		self.beams = []
 		self.k_left  = False
 		self.k_right = False
@@ -40,6 +41,7 @@ class ArcadeState(games.GameState):
 		self.k_left  = (self.k_left  and not (key == LEFT))
 		self.k_up    = (self.k_up    and not (key == UP))
 		self.k_down  = (self.k_down  and not (key == DOWN))
+		self.k_space = (self.k_space and not (key == SPACE))
 
 	def logic(self, ms):
 		self.ship.move_x(self.k_right - self.k_left)
@@ -51,5 +53,9 @@ class ArcadeState(games.GameState):
 				self.beams.remove(beam)
 
 		if self.k_space == True:
-			self.beams += self.ship.fire()
-			self.k_space = False
+			self.fire_interval += ms
+			if self.fire_interval >= 50:
+				self.beams += self.ship.fire()
+				self.fire_interval -= 50
+		else:
+			self.fire_interval = 0

games/spaceblaster/beam.py

@@ -6,10 +6,14 @@ load = image.load
 GO   = object.GameObject
 
 class Beam(GO):
-	def __init__(self, GAME, type, pos):
-		GO.__init__(self, load(GAME, "beam-%s.png" % type), pos, (0, 1))
+	def __init__(self, GAME, type, pos, speed):
+		GO.__init__(self, load(GAME, "beam-%s.png" % type), pos, speed)
 		self.allow_offscreen = True
 		self.min_y -= self.h
 
 	def move(self):
-		self.move_y(-1)
+		self.move_y(1)
+
+class CSEBeam(Beam):
+	def __init__(self, GAME, pos):
+		Beam.__init__(self, GAME, "blue", pos, (0, -1))

games/spaceblaster/ship.py

@@ -6,7 +6,7 @@ load = image.load
 GO   = object.GameObject
 
 import beam
-Beam = beam.Beam
+CSEBeam = beam.CSEBeam
 
 class ArcadeShip(GO):
 	def __init__(self, GAME, image, pos, speed):
@@ -20,5 +20,5 @@ class CSE1670(ArcadeShip):
 
 	def fire(self):
 		beams = []
-		beams.append(Beam(self.game, "blue", (self.x, self.y)))
+		beams.append(CSEBeam(self.game, (self.x, self.y)))
 		return beams