Start space invaders program

Author: atrocities

Day2/.spaceinvaders.py.swp

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+#Credit the Invent With Python book (http://inventwithpython.com)
+#for doRectsOverlap and isPointInsideRect functions
+
+#used to detect collisions in our game
+def doRectsOverlap(rect1, rect2):
+    for a, b in [(rect1, rect2), (rect2, rect1)]:
+        # Check if a's corners are inside b
+        if ((isPointInsideRect(a.left, a.top, b)) or
+            (isPointInsideRect(a.left, a.bottom, b)) or
+            (isPointInsideRect(a.right, a.top, b)) or
+            (isPointInsideRect(a.right, a.bottom, b))):
+            return True
+
+    return False
+
+#used the by the doRectsOverlap function (won't be called directly from game code)
+def isPointInsideRect(x, y, rect):
+    if (x > rect.left) and (x < rect.right) and (y > rect.top) and (y < rect.bottom):
+        return True
+    else:
+        return False
+
+import pygame, sys
+pygame.init()
+
+SCREEN_WIDTH = 640
+SCREEN_HEIGHT = 480
+
+screen = pygame.display.set_mode([SCREEN_WIDTH,SCREEN_HEIGHT])
+
+class Spaceship:
+  xpos = 0
+  ypos = 0
+
+  def __init__(self, x, y):
+    self.xpos = x
+    self.ypos = y
+
+class Alien:
+  xpos = 0
+  ypos = 0
+  xspeed = 2
+  picture = pygame.image.load('alien1.png')
+
+  def __init__(self, x, y):
+    self.xpos = x
+    self.ypos = y
+
+
+class Missile:
+  xpos = 0
+  ypos = 0
+  xspeed = 2
+  yspeed = 2
+
+  def __init__(self, x, y):
+    self.xpos = x
+    self.ypos = y
+