Added Play button

alien_invasion.py

@@ -9,6 +9,7 @@
 
 from settings import Settings
 from game_stats import GameStats
+from button import Button
 from ship import Ship
 from bullet import Bullet
 from alien import Alien
@@ -36,6 +37,9 @@ def __init__(self):
 
         self._create_fleet()
 
+        # Make the Play button
+        self.play_button = Button(self, "Play")
+
     def run_game(self):
         """This function runs the game."""
 
@@ -63,6 +67,28 @@ def _check_events(self):
                     self.ship.moving_right = False
                 elif event.key == pygame.K_LEFT:
                     self.ship.moving_left = False
+            elif event.type == pygame.MOUSEBUTTONDOWN:
+                mouse_pos = pygame.mouse.get_pos()
+                self._check_play_button(mouse_pos)
+
+    def _check_play_button(self, mouse_pos):
+        """Start a new game when the player clicks Play."""
+        button_clicked = self.play_button.rect.collidepoint(mouse_pos)
+        if button_clicked and not self.stats.game_active:
+            # Reset the game statistics.
+            self.stats.reset_stats()
+            self.stats.game_active = True
+
+            # Get rid of any remaining aliens and bullets.
+            self.aliens.empty()
+            self.bullets.empty()
+
+            # Create a new fleet and center the ship.
+            self._create_fleet()
+            self.ship.center_ship()
+
+            # Hide the mouse cursor.
+            pygame.mouse.set_visible(False)
 
     def _check_keydown_events(self, event):
         """Respond to keypresses."""
@@ -153,6 +179,7 @@ def _ship_hit(self):
             sleep(0.5)
         else:
             self.stats.game_active = False
+            pygame.mouse.set_visible(True)
 
     def _create_fleet(self):
         """Create the fleet of aliens."""
@@ -204,6 +231,10 @@ def _update_screen(self):
             bullet.draw_bullet()
         self.aliens.draw(self.screen)
 
+        # Draw the Play button if the game is inactive.
+        if not self.stats.game_active:
+            self.play_button.draw_button()
+
         pygame.display.flip()
 
 

button.py

@@ -0,0 +1,40 @@
+"""
+Base class for creating buttons in the game.
+"""
+
+import pygame.font
+
+
+class Button():
+    """This class handles the button."""
+
+    def __init__(self, ai_game, msg):
+        """Initialize button attributes."""
+        self.screen = ai_game.screen
+        self.screen_rect = self.screen.get_rect()
+
+        # Set the dimensions and sproperties of the button.
+        self.width, self.height = 200, 50
+        self.button_color = (0, 255, 0)
+        self.text_color = (255, 255, 255)
+        self.font = pygame.font.SysFont(None, 48)
+
+        # Build the button's rect object and center it.
+        self.rect = pygame.Rect(0, 0, self.width, self.height)
+        self.rect.center = self.screen_rect.center
+
+        # The button message needs to be prepped only once.
+        self._prep_msg(msg)
+
+    def _prep_msg(self, msg):
+        """Turn msg into a rendered image and center text on the button"""
+        self.msg_image = self.font.render(msg, True, self.text_color,
+                                          self.button_color)
+        self.msg_image_rect = self.msg_image.get_rect()
+        self.msg_image_rect.center = self.rect.center
+
+    def draw_button(self):
+        """This method draws the button"""
+        # Draw blank button and then draw message.
+        self.screen.fill(self.button_color, self.rect)
+        self.screen.blit(self.msg_image, self.msg_image_rect)

game_stats.py

@@ -10,8 +10,9 @@ def __init__(self, ai_game):
         """Initialize statistics"""
         self.settings = ai_game.settings
         self.reset_stats()
-        # Start Alien Invasion in an active state.
-        self.game_active = True
+
+        # Start game in an inactive state.
+        self.game_active = False
 
     def reset_stats(self):
         """Initialize statistics that can change during the game."""

settings.py

@@ -23,7 +23,7 @@ def __init__(self):
         self.bullets_allowed = 5
 
         # Alien settings
-        self.alien_speed = 1.0
-        self.fleet_drop_speed = 10
+        self.alien_speed = 3.0
+        self.fleet_drop_speed = 30
         # fleet_direction of 1 represents right; -1 represents left
         self.fleet_direction = 1