Do collision detection on the glassball

avocado.py

@@ -5,14 +5,16 @@ from support import operations
 
 class Avocado:
 
-    def __init__(self, screen, color, size, target, level, filename='img/AvoCado_0.png'):
+    def __init__(self, screen, boundaries, properties, target, level, filename='img/AvoCado_0.png'):
 
         # Set up our instance variables
         self.screen = screen
-        self.color = color
-        self.target = target
         self.screen_width, self.screen_height = screen.get_size()
-        self.w, self.y = size
+        color = properties['color']
+        self.w, self.y = properties['size']
+        self.target = target
+        self.boundaries = boundaries
+        self.checkObstacle = True
 
         # Initialize the image
         self.i = pygame.image.load(filename).convert_alpha()
@@ -81,7 +83,24 @@ class Avocado:
 
 
     def checkBoundaries(self):
+        # Checking screen boundaries
         if self.rect.right > self.screen_width or self.rect.left < 0:
+            self.checkObstacle = True
+            self.vx = -self.vx
+
+        # Checking for obstacle collisions
+        for obstacle in self.boundaries:
+            left, top, width, height = obstacle
+            right = left + width
+            bottom = top + height
+
+            if self.checkObstacle \
+             and (self.rect.right < right and self.rect.left > left):
+                self.checkObstacle = False
+
+            if self.checkObstacle \
+             and ((self.rect.right > right and self.rect.left < right) \
+             or (self.rect.left < left and self.rect.right > left)):
                 self.vx = -self.vx
 
 

crystal.py

@@ -12,11 +12,18 @@ class Crystal:
     def __init__(self, screen):
         self.screen = screen
         screen_width, screen_height = screen.get_size()
-        self.imageCenterX = self.screen.get_rect().centerx
-        self.imageCenterY = self.screen.get_rect().centery
+        self.rect = self.screen.get_rect()
+        self.imageCenterX = self.rect.centerx
+        self.imageCenterY = self.rect.centery
+        self.pos = (self.imageCenterX-100,self.imageCenterY-5,200,183)
+
+    def getBoundaries(self):
+        return self.pos
+
 
     def blitme(self):
-        pygame.draw.ellipse(self.screen, self.color, (self.imageCenterX-100,self.imageCenterY-5,200,183), 0)
+        pygame.draw.ellipse(self.screen, self.color, self.pos, 0)
+
 
     def setColor(self, color):
         self.color = color

game.py

@@ -140,6 +140,7 @@ class TheGame:
 
     def main(self):
         score = 0
+        boundaries = []
 
         # We could use this list for redrawing only this part
         # of the screen instead of all of it
@@ -148,6 +149,7 @@ class TheGame:
         # initialize the HUD class and the lawyer
         the_hud = hud.Hud(self.screen)
         crystalBall = crystal.Crystal(self.screen)
+        boundaries.append(crystalBall.getBoundaries())
 
         # Initial color indication
         color = self.chooseRandomColor()
@@ -203,13 +205,12 @@ class TheGame:
             if avocadosInGame < avocadosWanted:
                 probability = int(1.0/(avocadosWanted - avocadosInGame) * 100)
                 if random.randint(0, probability) < 3:
-                    avocolor = self.chooseRandomColor()
-                    avosize = (50, 50)   # should we randomize this?
+                    properties = {'color': self.chooseRandomColor(), 'size': (50,50)}
                     # Spawn a new avocado
                     a = avocado.Avocado(
                         self.screen,
-                        avocolor,
-                        avosize,
+                        boundaries,
+                        properties,
                         color,
                         self.level
                     )