Add asteroids

main.py

@@ -6,7 +6,7 @@ To add:
 '''
 
 
-import arcade, math
+import arcade, math, random
 
 SCREEN_SIZE = SCREEN_WIDTH, SCREEN_HEIGHT = 640, 480
 NAME = "Asteroids"
@@ -35,6 +35,8 @@ class Game(arcade.Window):
         
         self.player_sprite = None
         
+        self.time = 0
+        
         self.view_left = 0
         self.view_bottom = 0
         self.slide = False
@@ -42,11 +44,16 @@ class Game(arcade.Window):
         arcade.set_background_color(arcade.color.BLACK)
     
     # Add asteroid
-    def asteroid(x,y):
-        self.asteroid_sprite = arcade.Sprite("images/big_asteroid.png", SPRITE_SCALING)
-        self.all_sprites_list.append(self.player_sprite)
-        self.asteroid_sprite
-        self.asteroid_sprite.set_position(x,y)
+    def asteroid(self):
+        x = random.randint(self.view_left - 50, self.view_left + SCREEN_WIDTH + 50)
+        y = random.randint(self.view_bottom - 50, self.view_bottom + SCREEN_HEIGHT + 50)
+        asteroid_sprite = arcade.Sprite("images/big_asteroid.png", SPRITE_SCALING)
+        asteroid_sprite.set_position(x,y)
+        asteroid_sprite.change_x = random.randint(-5, 5)
+        asteroid_sprite.change_y = random.randint(-5, 5)
+        self.all_sprites_list.append(asteroid_sprite)
+        self.asteroid_list.append(asteroid_sprite)
+
 
     def setup(self):
         self.low_x = 0
@@ -64,6 +71,18 @@ class Game(arcade.Window):
         self.all_sprites_list.append(self.player_sprite)        
 
     def update(self, delta_time):
+        self.time += 1
+        if self.time % 300 == 0:
+            self.asteroid()
+        
+        for asteroid in self.asteroid_list:
+            if asteroid.center_x < self.view_left - 300 or asteroid.center_x > self.view_left + SCREEN_WIDTH + 300:
+                self.asteroid_list.remove(asteroid)
+                self.all_sprites_list.remove(asteroid)
+            if asteroid.center_y < self.view_bottom - 300 or asteroid.center_y > self.view_bottom + SCREEN_HEIGHT + 300:
+                self.asteroid_list.remove(asteroid)
+                self.all_sprites_list.remove(asteroid)
+        
         if not self.slide:
             self.player_sprite.change_y = self.running * SPEED * math.cos(math.radians(self.player_sprite.angle))
             self.player_sprite.change_x = self.running * -SPEED * math.sin(math.radians(self.player_sprite.angle))