add space invaders game tutorial

Author: x4nth055

README.md

@@ -313,6 +313,7 @@ This is a repository of all the tutorials of [The Python Code](https://www.thepy
     - [How to Create a Platformer Game in Python](https://www.thepythoncode.com/article/platformer-game-with-pygame-in-python). ([code](gui-programming/platformer-game))
     - [How to Make a Flappy Bird Game in Python](https://thepythoncode.com/article/make-a-flappy-bird-game-python). ([code](gui-programming/flappy-bird-game))
     - [How to Create a Pong Game in Python](https://thepythoncode.com/article/build-a-pong-game-in-python). ([code](gui-programming/pong-game))
+    - [How to Create a Space Invaders Game in Python](https://thepythoncode.com/article/make-a-space-invader-game-in-python). ([code](gui-programming/space-invaders-game))
 
 
 For any feedback, please consider pulling requests.

gui-programming/space-invaders-game/README.md

@@ -0,0 +1 @@
+# [How to Create a Space Invaders Game in Python](https://thepythoncode.com/article/make-a-space-invader-game-in-python)

gui-programming/space-invaders-game/alien.py

@@ -0,0 +1,39 @@
+import pygame
+
+from settings import BULLET_SIZE
+from bullet import Bullet
+
+class Alien(pygame.sprite.Sprite):
+	def __init__(self, pos, size, row_num):
+		super().__init__()
+		self.x = pos[0]
+		self.y = pos[1]
+
+		# alien info
+		img_path = f'assets/aliens/{row_num}.png'
+		self.image = pygame.image.load(img_path)
+		self.image = pygame.transform.scale(self.image, (size, size))
+		self.rect = self.image.get_rect(topleft = pos)
+		self.mask = pygame.mask.from_surface(self.image)
+		self.move_speed = 5
+		self.to_direction = "right"
+
+		# alien status
+		self.bullets = pygame.sprite.GroupSingle()
+
+
+	def move_left(self):
+		self.rect.x -= self.move_speed
+
+	def move_right(self):
+		self.rect.x += self.move_speed
+
+	def move_bottom(self):
+		self.rect.y += self.move_speed
+
+	def _shoot(self):
+		specific_pos = (self.rect.centerx - (BULLET_SIZE // 2), self.rect.centery)
+		self.bullets.add(Bullet(specific_pos, BULLET_SIZE, "enemy"))
+
+	def update(self):
+		self.rect = self.image.get_rect(topleft=(self.rect.x, self.rect.y))

gui-programming/space-invaders-game/assets/aliens/0.png

@@ -0,0 +1,34 @@
+import pygame
+from settings import BULLET_SPEED, HEIGHT
+
+class Bullet(pygame.sprite.Sprite):
+	def __init__(self, pos, size, side):
+		super().__init__()
+		self.x = pos[0]
+		self.y = pos[1]
+
+		# bullet info
+		img_path = f'assets/bullet/{side}-bullet.png'
+		self.image = pygame.image.load(img_path)
+		self.image = pygame.transform.scale(self.image, (size, size))
+		self.rect = self.image.get_rect(topleft = pos)
+		self.mask = pygame.mask.from_surface(self.image)
+
+		# different bullet movement direction for both player and enemy (alien)
+		if side == "enemy":
+			self.move_speed = BULLET_SPEED
+		elif side == "player":
+			self.move_speed = (- BULLET_SPEED)
+
+
+	def _move_bullet(self):
+		self.rect.y += self.move_speed
+
+
+	def update(self):
+		self._move_bullet()
+		self.rect = self.image.get_rect(topleft=(self.rect.x, self.rect.y))
+
+		# delete the bullet if it get through out of the screen
+		if self.rect.bottom <= 0 or self.rect.top >= HEIGHT:
+			self.kill()

gui-programming/space-invaders-game/assets/aliens/1.png

@@ -0,0 +1,43 @@
+import pygame
+from settings import WIDTH, HEIGHT, SPACE, FONT_SIZE, EVENT_FONT_SIZE
+
+pygame.font.init()
+
+class Display:
+	def __init__(self, screen):
+		self.screen = screen
+		self.score_font = pygame.font.SysFont("monospace", FONT_SIZE)
+		self.level_font = pygame.font.SysFont("impact", FONT_SIZE)
+		self.event_font = pygame.font.SysFont("impact", EVENT_FONT_SIZE)
+		self.text_color = pygame.Color("blue")
+		self.event_color = pygame.Color("red")
+
+
+	def show_life(self, life):
+		life_size = 30
+		img_path = "assets/life/life.png"
+		life_image = pygame.image.load(img_path)
+		life_image = pygame.transform.scale(life_image, (life_size, life_size))
+		life_x = SPACE // 2
+
+		if life != 0:
+			for life in range(life):
+				self.screen.blit(life_image, (life_x, HEIGHT + (SPACE // 2)))
+				life_x += life_size
+
+
+	def show_score(self, score):
+		score_x = WIDTH // 3
+		score = self.score_font.render(f'score: {score}', True, self.text_color)
+		self.screen.blit(score, (score_x, (HEIGHT + (SPACE // 2))))
+
+
+	def show_level(self, level):
+		level_x = WIDTH // 3
+		level = self.level_font.render(f'Level {level}', True, self.text_color)
+		self.screen.blit(level, (level_x * 2, (HEIGHT + (SPACE // 2))))
+
+
+	def game_over_message(self):
+		message = self.event_font.render('GAME OVER!!', True, self.event_color)
+		self.screen.blit(message, ((WIDTH // 3) - (EVENT_FONT_SIZE // 2), (HEIGHT // 2) - (EVENT_FONT_SIZE // 2)))

gui-programming/space-invaders-game/assets/aliens/2.png

@@ -0,0 +1,36 @@
+import pygame, sys
+from settings import WIDTH, HEIGHT, NAV_THICKNESS
+from world import World
+
+pygame.init()
+
+screen = pygame.display.set_mode((WIDTH, HEIGHT + NAV_THICKNESS))
+pygame.display.set_caption("Space Invader")
+
+class Main:
+	def __init__(self, screen):
+		self.screen = screen
+		self.FPS = pygame.time.Clock()
+
+	def main(self):
+		world = World(self.screen)
+		while True:
+			self.screen.fill("black")
+
+			for event in pygame.event.get():
+				if event.type == pygame.QUIT:
+					pygame.quit()
+					sys.exit()
+				if event.type == pygame.KEYDOWN:
+					if event.key == pygame.K_SPACE:
+						world.player_move(attack = True)
+
+			world.player_move()
+			world.update()
+			pygame.display.update()
+			self.FPS.tick(30)
+
+
+if __name__ == "__main__":
+	play = Main(screen)
+	play.main()

gui-programming/space-invaders-game/assets/bullet/enemy-bullet.png

@@ -0,0 +1 @@
+pygame

gui-programming/space-invaders-game/assets/bullet/player-bullet.png

@@ -0,0 +1,11 @@
+WIDTH, HEIGHT = 720, 450
+
+SPACE = 30
+FONT_SIZE = 20
+EVENT_FONT_SIZE = 60
+NAV_THICKNESS = 50
+CHARACTER_SIZE  = 30
+PLAYER_SPEED = 10
+ENEMY_SPEED = 1
+BULLET_SPEED = 15 # for both sides
+BULLET_SIZE = 10

gui-programming/space-invaders-game/assets/life/life.png

@@ -0,0 +1,42 @@
+import pygame
+
+from settings import PLAYER_SPEED, BULLET_SIZE
+from bullet import Bullet
+
+class Ship(pygame.sprite.Sprite):
+	def __init__(self, pos, size):
+		super().__init__()
+		self.x = pos[0]
+		self.y = pos[1]
+
+		# ship info 
+		img_path = 'assets/ship/ship.png'
+		self.image = pygame.image.load(img_path)
+		self.image = pygame.transform.scale(self.image, (size, size))
+		self.rect = self.image.get_rect(topleft = pos)
+		self.mask = pygame.mask.from_surface(self.image)
+		self.ship_speed = PLAYER_SPEED
+
+		# ship status
+		self.life = 3
+		self.player_bullets = pygame.sprite.Group()
+
+
+	def move_left(self):
+		self.rect.x -= self.ship_speed
+
+	def move_up(self):
+		self.rect.y -= self.ship_speed
+
+	def move_right(self):
+		self.rect.x += self.ship_speed
+
+	def move_bottom(self):
+		self.rect.y += self.ship_speed
+
+	def _shoot(self):
+		specific_pos = (self.rect.centerx - (BULLET_SIZE // 2), self.rect.y)
+		self.player_bullets.add(Bullet(specific_pos, BULLET_SIZE, "player"))
+
+	def update(self):
+		self.rect = self.image.get_rect(topleft=(self.rect.x, self.rect.y))