{"id":4890,"date":"2020-07-02T10:51:05","date_gmt":"2020-07-02T10:51:05","guid":{"rendered":"https:\/\/toptechytips.com\/?p=4890"},"modified":"2020-07-02T10:51:05","modified_gmt":"2020-07-02T10:51:05","slug":"build-space-invader-game-with-python","status":"publish","type":"post","link":"https:\/\/dotslaz.com\/build-space-invader-game-with-python\/","title":{"rendered":"Let&#8217;s Build Space Invader Game With Python"},"content":{"rendered":"<p>Developing a game is very interesting to do. Today we are going to build a space invader game with python&#8217;s library called &#8220;<strong>pygame<\/strong>&#8220;. In our game, there will be enemy ships which we need to destroy with our ship which can shoot a bullet. If a specific amount of enemy ship passes our ship we will lose.\u00a0 Any enemy ship hits our ship, we will lose. We run out of ammo, we lose. So, this is what we are gonna build today with Python.<\/p>\n<h3>Prerequisites<\/h3>\n<ul>\n<li>Linux (mine is ubuntu 18.04)<\/li>\n<li>Python3.7<\/li>\n<li>pip<\/li>\n<li>venv<\/li>\n<li>pygame<\/li>\n<\/ul>\n<h3>Environment Setup &amp; Installation<\/h3>\n<p>Always remember, whenever you are becoming a crazy horse to build a new python project, just hold that horse for a few seconds. Set up a virtual environment first and thank me later. Go to your favorite directory and follow the steps<\/p>\n<pre>python3 -m venv my_env<\/pre>\n<pre>cd my_env<\/pre>\n<p>Now we need to activate the virtual environment. And then we need to install <strong>pygame.<\/strong><\/p>\n<pre>. bin\/activate\r\npip install pygame<\/pre>\n<p>Now create our project repository. We will call our project space_invader<strong><em>.<\/em><\/strong><\/p>\n<pre>mkdir space_invader<\/pre>\n<h3>Game Assets<\/h3>\n<p>I gave a GitHub link at the very bottom of this article. Visit there and download the assets we need in our game. We will need an image file for our ship, enemy ship, and bullet. And for some sound effects, we need explosion and firing sound.<\/p>\n<h3>Develop The Game<\/h3>\n<p>First, we need to import all the things we need.<\/p>\n<pre>import os\r\nimport random\r\nimport math\r\nimport pygame<\/pre>\n<p>Then we need to init the game.<\/p>\n<pre>pygame.mixer.pre_init(frequency=44100)\r\npygame.init()\r\npygame.mixer.init(frequency=44100)<\/pre>\n<p>Now, to make the game visible we need a window, right? Let&#8217;s create one with size, an icon, and a caption.<\/p>\n<pre>if __name__ == \"__main__\":\r\n\r\n    # window config\r\n    window_height = 800\r\n    window_width = 800\r\n\r\n    window = pygame.display.set_mode((window_width, window_height))\r\n    pygame.display.set_caption('War Ship')\r\n    game_icon = pygame.image.load(os.path.join(\"assets\", \"icon.png\"))\r\n    pygame.display.set_icon(game_icon)<\/pre>\n<p>&nbsp;<\/p>\n<p>Now, let&#8217;s load the assets and fonts we will use later on.<\/p>\n<pre># assets loading and fonts\r\nBACKGROUND = pygame.image.load(os.path.join(\"assets\", \"background.jpg\"))\r\nPLAYER_IMAGE = pygame.image.load(os.path.join(\"assets\", \"spaceship.png\"))\r\nRED_ENEMY_IMAGE = pygame.image.load(os.path.join(\"assets\", \"red-enemy.png\"))\r\nBULLET = pygame.image.load(os.path.join(\"assets\", \"bullet.png\"))\r\n\r\nexplosion_sound = pygame.mixer.Sound(os.path.join(\"assets\",\r\n                                                  \"explosion.WAV\"))\r\nfont = pygame.font.Font(\"freesansbold.ttf\", 20)\r\ngame_over_font = pygame.font.Font(\"freesansbold.ttf\", 70)<\/pre>\n<h3>Scoring<\/h3>\n<p>Initially, our score will be zero, and our life will be 100. Also, the total score to obtain in case of winning is 1000. We will set a rules for the ammo limit, which is in our case (winning score \/ 10) + 20. Of course, you can set your own rules here.<\/p>\n<pre># scoring\r\nscore = 0\r\nlife = 100\r\nwinning_score = 1000\r\nammo = winning_score\/10 + 20<\/pre>\n<h3>Game property configuration<\/h3>\n<p>Let&#8217;s set the initial position and velocity of our fighter ship.<\/p>\n<pre># player\r\nplayer_x = 350\r\nplayer_y = 730\r\nplayer_velocity = 5<\/pre>\n<p>Also, we have the freedom to decide these values. But make sure the values make sense.<\/p>\n<p>Let&#8217;s do the same for an enemy ship, but the enemy ship will be multiple.<\/p>\n<pre># enemy ships\r\nenemy_image = []\r\nenemy_x = []\r\nenemy_y = []\r\nenemy_velocity = []\r\nenemy_number = 5\r\nfor i in range(0, enemy_number):\r\n    enemy_image.append(RED_ENEMY_IMAGE)\r\n    enemy_x.append(random.randint(70, 730))\r\n    enemy_y.append(70)\r\n    enemy_velocity.append(random.uniform(0.1, 0.5))<\/pre>\n<p>Now, while we are configuring our bullet properties, we must make sure it&#8217;s faster than other ships.<\/p>\n<pre># bullet\r\nbullet_x = 0\r\nbullet_y = 750\r\nbullet_velocity = 15\r\nbullet_state = \"ready\"<\/pre>\n<h3>Actions<\/h3>\n<p>Now, let&#8217;s build a method to show the score, life, and ammo. And also the texts for winning and game-over event.<\/p>\n<pre># actions\r\ndef show_score():\r\n    score_text = font.render(\"Score : \" + str(score), True, (255, 255, 255))\r\n    ammo_text = font.render(\"Ammo : \" + str(ammo), True, (255, 255, 255))\r\n    color = (255, 255, 255)\r\n    if 100 &gt; life &gt;= 60:\r\n        color = (14, 214, 0)\r\n    if 60 &gt; life &gt; 40:\r\n        color = (177, 184, 0)\r\n    if 40 &gt; life &gt;= 0:\r\n        color = (184, 0, 0)\r\n\r\n    life_text = font.render(\"Life : \" + str(life), True, color)\r\n    window.blit(score_text, (10, 10))\r\n    window.blit(ammo_text, (400, 10))\r\n    window.blit(life_text, (600, 10))\r\n    \r\n\r\n<\/pre>\n<pre>def game_over_text():\r\n    text = font.render(\"GAME OVER\", True, (255, 255, 255))\r\n    window.blit(text, (400, 400))\r\n\r\n\r\ndef winner_text():\r\n    text = font.render(\"YOY WIN\", True, (184, 0, 0))\r\n    window.blit(text, (400, 400))<\/pre>\n<pre><\/pre>\n<p>And also methods to display the player ship, enemy ships, and bullet in the window.<\/p>\n<pre>def player(x, y):\r\n    window.blit(PLAYER_IMAGE, (x, y))\r\n\r\n\r\ndef enemy(x, y, nth_enemy):\r\n    window.blit(enemy_image[nth_enemy], (x, y))\r\n\r\n\r\ndef trigger_bullet(x, y):\r\n    global bullet_state\r\n    bullet_state = \"fire\"\r\n    window.blit(BULLET, (x + 10, y + 10))<\/pre>\n<p>&nbsp;<\/p>\n<p>We also need a method to check collision. But to do that we need a little bit of help from mathematics. To find the distance between two points by using the distance formula, which is an application of the Pythagorean theorem. We can rewrite the Pythagorean theorem as <strong>d=\u221a((x_2-x_1)\u00b2+(y_2-y_1)\u00b2)<\/strong> to find the distance between any two points<\/p>\n<p>Also, we will play a sound when this action occurs.<\/p>\n<pre>def collision(ex, ey, bx, by):\r\n    distance = math.sqrt(math.pow((ex - bx), 2) + math.pow((ey - by), 2))\r\n    if distance &lt; 30:\r\n        explosion_sound.play()\r\n        return True\r\n    return False<\/pre>\n<p>&nbsp;<\/p>\n<h3>The game loop<\/h3>\n<p>Now lets, build the game loop and check events in it for now. in our game loop we need to load a background image for a better view. And if we quit the window the game will get out from the while loop.<\/p>\n<pre># Game Loop\r\n\r\nrun = True\r\nwhile run:\r\n    window.fill((0, 0, 0))\r\n    window.blit(BACKGROUND, (0, 0))\r\n\r\n    for event in pygame.event.get():\r\n        if event.type == pygame.QUIT:\r\n            run = False<\/pre>\n<p>Now let&#8217;s catch the left and right keypress events and change the coordinate of our player ship.<\/p>\n<pre>keys = pygame.key.get_pressed()\r\n\r\nif keys[pygame.K_LEFT] and player_x &gt; player_velocity:\r\n    player_x -= player_velocity\r\nif keys[pygame.K_RIGHT] and player_x &lt; (window_width - 64 -\r\n                                        player_velocity):\r\n    player_x += player_velocity<\/pre>\n<p>To fire bullet we will press the space key, so we need to catch the space button press event. We will also play a sound and keep track of our ammo. If we ran out of ammo then we will simple get lost from the game loop by breaking the while loop.<\/p>\n<pre>if keys[pygame.K_SPACE]:\r\n    if bullet_state is \"ready\" and ammo &gt; 0:\r\n        print(\"FIRE IN THE HOLE!\")\r\n        ammo -= 1\r\n        bullet_sound = pygame.mixer.Sound(\r\n            os.path.join(\"assets\", \"GUNSHOT.WAV\"))\r\n        bullet_sound.play()\r\n        bullet_x = player_x\r\n        trigger_bullet(bullet_x, bullet_y)\r\n\r\n        if ammo == 0:\r\n            game_over_text()\r\n            run = False<\/pre>\n<p>Now, let&#8217;s change and check the bullet state. If the bullet state is &#8220;fire&#8221; then we will keep increasing the Y-AXIS position of the bullet.<\/p>\n<pre>if bullet_y &lt;= 0:\r\n    bullet_y = 750\r\n    bullet_state = \"ready\"\r\n\r\nif bullet_state == \"fire\":\r\n    trigger_bullet(bullet_x, bullet_y)\r\n    bullet_y -= bullet_velocity<\/pre>\n<p>Now,\u00a0 let&#8217;s work on the enemy ship. We need to keep them moving through the Y-Axis. And if enemy ship passes our ship we will lose 10 life out of total 100 life. And a collision between bullet and enemy ship happen, we need to remove the enemy ship from our window. But if any collision between our ship and enemy ship occurs then the game will be over by breaking the loop.<\/p>\n<pre>for j in range(0, enemy_number):\r\n    if enemy_y[j] &gt;= 750:\r\n        life -= 10\r\n        if life == 0:\r\n            game_over_text()\r\n            run = False\r\n        enemy_y[j] = 10\r\n\r\n    enemy_y[j] += enemy_velocity[j]\r\n\r\n    if collision(enemy_x[j], enemy_y[j], bullet_x, bullet_y):\r\n        print(\"ENEMY DESTROYED\")\r\n        score += 10\r\n        if score &gt;= winning_score:\r\n            winner_text()\r\n            run = False\r\n        bullet_y = 750\r\n        bullet_state = \"ready\"\r\n        enemy_x[j] = random.randint(70, 730)\r\n        enemy_y[j] = 10\r\n\r\n    if collision(enemy_x[j], enemy_y[j], player_x, player_y):\r\n        game_over_text()\r\n        run = False\r\n\r\n    enemy(enemy_x[j], enemy_y[j], j)<\/pre>\n<p>Now at the very end display the player and show the score.<\/p>\n<pre>player(player_x, player_y)\r\nshow_score()\r\n\r\npygame.display.update()<\/pre>\n<p>And outside of the loop, we will just quit the window.<\/p>\n<pre>pygame.quit()<\/pre>\n<h3>Source Code<\/h3>\n<p>If you followed all the steps then your code will look like this. And of course, you can improve the code by dividing them in separate files. We will see the OOP version of this game later.<\/p>\n<pre>import os\r\nimport random\r\nimport math\r\nimport pygame\r\n\r\npygame.mixer.pre_init(frequency=44100)\r\npygame.init()\r\npygame.mixer.init(frequency=44100)\r\n\r\nif __name__ == \"__main__\":\r\n\r\n    # window config\r\n    window_height = 800\r\n    window_width = 800\r\n\r\n    window = pygame.display.set_mode((window_width, window_height))\r\n    pygame.display.set_caption('War Ship')\r\n    game_icon = pygame.image.load(os.path.join(\"assets\", \"icon.png\"))\r\n    pygame.display.set_icon(game_icon)\r\n\r\n    # assets loading and fonts\r\n    BACKGROUND = pygame.image.load(os.path.join(\"assets\", \"background.jpg\"))\r\n    PLAYER_IMAGE = pygame.image.load(os.path.join(\"assets\", \"spaceship.png\"))\r\n    RED_ENEMY_IMAGE = pygame.image.load(os.path.join(\"assets\", \"red-enemy.png\"))\r\n    BULLET = pygame.image.load(os.path.join(\"assets\", \"bullet.png\"))\r\n\r\n    explosion_sound = pygame.mixer.Sound(os.path.join(\"assets\",\r\n                                                      \"explosion.WAV\"))\r\n    font = pygame.font.Font(\"freesansbold.ttf\", 20)\r\n    game_over_font = pygame.font.Font(\"freesansbold.ttf\", 70)\r\n\r\n    # scoring\r\n    score = 0\r\n    life = 100\r\n    winning_score = 1000\r\n    ammo = winning_score\/10 + 20\r\n\r\n    # player\r\n    player_x = 350\r\n    player_y = 730\r\n    player_velocity = 5\r\n\r\n    # enemy ships\r\n    enemy_image = []\r\n    enemy_x = []\r\n    enemy_y = []\r\n    enemy_velocity = []\r\n    enemy_number = 5\r\n    for i in range(0, enemy_number):\r\n        enemy_image.append(RED_ENEMY_IMAGE)\r\n        enemy_x.append(random.randint(70, 730))\r\n        enemy_y.append(70)\r\n        enemy_velocity.append(random.uniform(0.1, 0.5))\r\n\r\n    # bullet\r\n    bullet_x = 0\r\n    bullet_y = 750\r\n    bullet_velocity = 15\r\n    bullet_state = \"ready\"\r\n\r\n    # actions\r\n    def show_score():\r\n        score_text = font.render(\"Score : \" + str(score), True, (255, 255, 255))\r\n        ammo_text = font.render(\"Ammo : \" + str(ammo), True, (255, 255, 255))\r\n        color = (255, 255, 255)\r\n        if 100 &gt; life &gt;= 60:\r\n            color = (14, 214, 0)\r\n        if 60 &gt; life &gt; 40:\r\n            color = (177, 184, 0)\r\n        if 40 &gt; life &gt;= 0:\r\n            color = (184, 0, 0)\r\n\r\n        life_text = font.render(\"Life : \" + str(life), True, color)\r\n        window.blit(score_text, (10, 10))\r\n        window.blit(ammo_text, (400, 10))\r\n        window.blit(life_text, (600, 10))\r\n\r\n    def player(x, y):\r\n        window.blit(PLAYER_IMAGE, (x, y))\r\n\r\n\r\n    def enemy(x, y, nth_enemy):\r\n        window.blit(enemy_image[nth_enemy], (x, y))\r\n\r\n\r\n    def trigger_bullet(x, y):\r\n        global bullet_state\r\n        bullet_state = \"fire\"\r\n        window.blit(BULLET, (x + 10, y + 10))\r\n\r\n\r\n    def collision(ex, ey, bx, by):\r\n        distance = math.sqrt(math.pow((ex - bx), 2) + math.pow((ey - by), 2))\r\n        if distance &lt; 30:\r\n            explosion_sound.play()\r\n            return True\r\n        return False\r\n\r\n    def game_over_text():\r\n        text = font.render(\"GAME OVER\", True, (255, 255, 255))\r\n        window.blit(text, (400, 400))\r\n\r\n    def winner_text():\r\n        text = font.render(\"YOY WIN\", True, (184, 0, 0))\r\n        window.blit(text, (400, 400))\r\n\r\n    # Game Loop\r\n\r\n    run = True\r\n    while run:\r\n        window.fill((0, 0, 0))\r\n        window.blit(BACKGROUND, (0, 0))\r\n\r\n        for event in pygame.event.get():\r\n            if event.type == pygame.QUIT:\r\n                run = False\r\n\r\n        keys = pygame.key.get_pressed()\r\n\r\n        if keys[pygame.K_LEFT] and player_x &gt; player_velocity:\r\n            player_x -= player_velocity\r\n        if keys[pygame.K_RIGHT] and player_x &lt; (window_width - 64 -\r\n                                                player_velocity):\r\n            player_x += player_velocity\r\n        if keys[pygame.K_SPACE]:\r\n            if bullet_state is \"ready\" and ammo &gt; 0:\r\n                print(\"FIRE IN THE HOLE!\")\r\n                ammo -= 1\r\n                bullet_sound = pygame.mixer.Sound(\r\n                    os.path.join(\"assets\", \"GUNSHOT.WAV\"))\r\n                bullet_sound.play()\r\n                bullet_x = player_x\r\n                trigger_bullet(bullet_x, bullet_y)\r\n\r\n                if ammo == 0:\r\n                    game_over_text()\r\n                    run = False\r\n\r\n        if bullet_y &lt;= 0:\r\n            bullet_y = 750\r\n            bullet_state = \"ready\"\r\n\r\n        if bullet_state == \"fire\":\r\n            trigger_bullet(bullet_x, bullet_y)\r\n            bullet_y -= bullet_velocity\r\n\r\n        for j in range(0, enemy_number):\r\n            if enemy_y[j] &gt;= 750:\r\n                life -= 10\r\n                if life == 0:\r\n                    game_over_text()\r\n                    run = False\r\n                enemy_y[j] = 10\r\n\r\n            enemy_y[j] += enemy_velocity[j]\r\n\r\n            if collision(enemy_x[j], enemy_y[j], bullet_x, bullet_y):\r\n                print(\"ENEMY DESTROYED\")\r\n                score += 10\r\n                if score &gt;= winning_score:\r\n                    winner_text()\r\n                    run = False\r\n                bullet_y = 750\r\n                bullet_state = \"ready\"\r\n                enemy_x[j] = random.randint(70, 730)\r\n                enemy_y[j] = 10\r\n\r\n            if collision(enemy_x[j], enemy_y[j], player_x, player_y):\r\n                game_over_text()\r\n                run = False\r\n\r\n            enemy(enemy_x[j], enemy_y[j], j)\r\n\r\n        player(player_x, player_y)\r\n        show_score()\r\n\r\n        pygame.display.update()\r\n\r\npygame.quit()<\/pre>\n<p>Here is the video demo of the game.<\/p>\n<div style=\"width: 640px;\" class=\"wp-video\"><!--[if lt IE 9]><script>document.createElement('video');<\/script><![endif]-->\n<video class=\"wp-video-shortcode\" id=\"video-4890-1\" width=\"640\" height=\"360\" preload=\"metadata\" controls=\"controls\"><source type=\"video\/ogg\" src=\"https:\/\/toptechytips.com\/wp-content\/uploads\/2020\/06\/out.ogv?_=1\" \/><a href=\"https:\/\/toptechytips.com\/wp-content\/uploads\/2020\/06\/out.ogv\">https:\/\/toptechytips.com\/wp-content\/uploads\/2020\/06\/out.ogv<\/a><\/video><\/div>\n<p>&nbsp;<\/p>\n<p>My Github Repository: <a href=\"https:\/\/github.com\/zim0101\/python_space_invader\" target=\"_blank\" rel=\"nofollow noopener noreferrer\">https:\/\/github.com\/zim0101\/python_space_invader<\/a><\/p>\n<p>Feel free to clone the repo and enjoy the game.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Developing a game is very interesting to do. Today we are going to build a space invader game with python&#8217;s library called &#8220;pygame&#8220;. In our game, there will be enemy ships which we need to destroy with our ship which can shoot a bullet. If a specific amount of enemy ship passes our ship we [&hellip;]<\/p>\n","protected":false},"author":6,"featured_media":4947,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[46,55],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v19.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Let&#039;s Build Space Invader Game With Python - Dotslaz<\/title>\n<meta name=\"description\" content=\"Developing a game is very interesting to do. Today we are going to build a space invader game with python&#039;s library called &quot;pygame&quot;. 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