game logic

Author: Fallacies-TE

asteroid.py

@@ -0,0 +1,27 @@
+from circleshape import *
+from constants import *
+import random
+
+class Asteroid(CircleShape):
+    def __init__(self, x, y, radius):
+        super().__init__(x, y, radius)
+
+    def split(self):
+        self.kill()
+        if self.radius <= ASTEROID_MIN_RADIUS:
+            return
+        angle = random.uniform(20, 51)
+        velocity_1 = self.velocity.rotate(angle)
+        velocity_2 = self.velocity.rotate(-angle)
+        radius = self.radius - ASTEROID_MIN_RADIUS
+        a_1 = Asteroid(self.position.x, self.position.y, radius)
+        a_2 = Asteroid(self.position.x, self.position.y, radius)
+        a_1.velocity = velocity_1 * 1.2
+        a_2.velocity = velocity_2 * 1.2
+
+    def draw(self, screen):
+        pygame.draw.circle(screen, "white", self.position, self.radius, 2)
+
+    def update(self, dt):
+        self.position += self.velocity * dt
+        

asteroidfield.py

@@ -0,0 +1,51 @@
+import pygame
+import random
+from asteroid import Asteroid
+from constants import *
+
+
+class AsteroidField(pygame.sprite.Sprite):
+    edges = [
+        [
+            pygame.Vector2(1, 0),
+            lambda y: pygame.Vector2(-ASTEROID_MAX_RADIUS, y * SCREEN_HEIGHT),
+        ],
+        [
+            pygame.Vector2(-1, 0),
+            lambda y: pygame.Vector2(
+                SCREEN_WIDTH + ASTEROID_MAX_RADIUS, y * SCREEN_HEIGHT
+            ),
+        ],
+        [
+            pygame.Vector2(0, 1),
+            lambda x: pygame.Vector2(x * SCREEN_WIDTH, -ASTEROID_MAX_RADIUS),
+        ],
+        [
+            pygame.Vector2(0, -1),
+            lambda x: pygame.Vector2(
+                x * SCREEN_WIDTH, SCREEN_HEIGHT + ASTEROID_MAX_RADIUS
+            ),
+        ],
+    ]
+
+    def __init__(self):
+        pygame.sprite.Sprite.__init__(self, self.containers)
+        self.spawn_timer = 0.0
+
+    def spawn(self, radius, position, velocity):
+        asteroid = Asteroid(position.x, position.y, radius)
+        asteroid.velocity = velocity
+
+    def update(self, dt):
+        self.spawn_timer += dt
+        if self.spawn_timer > ASTEROID_SPAWN_RATE:
+            self.spawn_timer = 0
+
+            # spawn a new asteroid at a random edge
+            edge = random.choice(self.edges)
+            speed = random.randint(40, 100)
+            velocity = edge[0] * speed
+            velocity = velocity.rotate(random.randint(-30, 30))
+            position = edge[1](random.uniform(0, 1))
+            kind = random.randint(1, ASTEROID_KINDS)
+            self.spawn(ASTEROID_MIN_RADIUS * kind, position, velocity)

circleshape.py

@@ -13,6 +13,10 @@ def __init__(self, x, y, radius):
         self.velocity = pygame.Vector2(0, 0)
         self.radius = radius
 
+    def is_colliding(self, other):
+        distance = self.position.distance_to(other.position)
+        return distance <= self.radius + other.radius
+
     def draw(self, screen):
         # sub-classes must override
         pass

constants.py

@@ -1,6 +1,15 @@
 SCREEN_WIDTH = 1280
 SCREEN_HEIGHT = 720
+
 ASTEROID_MIN_RADIUS = 20
 ASTEROID_KINDS = 3
 ASTEROID_SPAWN_RATE = 0.8
-ASTEROID_MAX_RADIUS = ASTEROID_MIN_RADIUS * ASTEROID_KINDS
+ASTEROID_MAX_RADIUS = ASTEROID_MIN_RADIUS * ASTEROID_KINDS
+
+PLAYER_RADIUS = 20
+PLAYER_TURN_SPEED = 300
+PLAYER_SPEED = 200
+PLAYER_SHOOT_SPEED = 500
+PLAYER_SHOOT_COOLDOWN = .3
+
+SHOT_RADIUS = 5

main.py

@@ -1,5 +1,9 @@
 import pygame
 from constants import *
+from player import *
+from asteroid import *
+from asteroidfield import *
+from shot import *
 
 def main():
     print("Starting asteroids!")
@@ -9,11 +13,42 @@ def main():
     screen = pygame.display.set_mode((SCREEN_WIDTH, SCREEN_HEIGHT))
     clock = pygame.time.Clock()
     dt = 0
+    updatable = pygame.sprite.Group()
+    drawable = pygame.sprite.Group()
+    asteroids = pygame.sprite.Group()
+    shots = pygame.sprite.Group()
+
+    Player.containers = (updatable, drawable)
+    player = Player(SCREEN_WIDTH / 2, SCREEN_HEIGHT / 2)
+
+    Asteroid.containers = (asteroids, updatable, drawable)  
+    AsteroidField.containers = (updatable)
+    asteroid_field = AsteroidField()
+
+    Shot.containers = (shots, updatable, drawable)   
+
     while True:
         for event in pygame.event.get():
             if event.type == pygame.QUIT:
                 return
+            
+        for obj in updatable:
+            obj.update(dt)
+
+        for asteroid in asteroids:
+            for shot in shots:
+                if shot.is_colliding(asteroid):
+                    asteroid.split()
+                    break
+            if asteroid.is_colliding(player):
+                raise SystemExit("Game over!")
+
+
         screen.fill((0, 0, 0))
+
+        for obj in drawable:
+            obj.draw(screen)
+
         pygame.display.flip()
         dt = clock.tick(60) / 1000
 

player.py

@@ -0,0 +1,50 @@
+from circleshape import *
+from constants import *
+from shot import *
+
+class Player(CircleShape):
+
+    def __init__(self, x, y):
+        super().__init__(x, y, PLAYER_RADIUS)
+        self.rotation = 0
+        self.shot_cooldown = 0
+
+    # in the player class
+    def triangle(self):
+        forward = pygame.Vector2(0, 1).rotate(self.rotation)
+        right = pygame.Vector2(0, 1).rotate(self.rotation + 90) * self.radius / 1.5
+        a = self.position + forward * self.radius
+        b = self.position - forward * self.radius - right
+        c = self.position - forward * self.radius + right
+        return [a, b, c]
+    
+    def draw(self, screen):
+        pygame.draw.polygon(screen, "white", self.triangle(), 2)
+
+    def rotate(self, dt):
+        self.rotation += PLAYER_TURN_SPEED * dt
+
+    def move(self, dt):
+        self.position += pygame.Vector2(0, 1).rotate(self.rotation) * PLAYER_SPEED * dt
+
+    def shoot(self):
+        if self.shot_cooldown > 0:
+            return
+        self.shot_cooldown = PLAYER_SHOOT_COOLDOWN
+        shot = Shot(self.position.x, self.position.y)
+        shot.velocity = pygame.Vector2(0, 1).rotate(self.rotation) * PLAYER_SHOOT_SPEED
+
+    def update(self, dt):
+        keys = pygame.key.get_pressed()
+        self.shot_cooldown -= dt
+
+        if keys[pygame.K_a]:
+            self.rotate(dt * -1)
+        if keys[pygame.K_d]:
+            self.rotate(dt)
+        if keys[pygame.K_w]:
+            self.move(dt)
+        if keys[pygame.K_s]:
+            self.move(dt * -1)
+        if keys[pygame.K_SPACE]:
+            self.shoot()

shot.py

@@ -0,0 +1,13 @@
+from circleshape import *
+from constants import *
+
+class Shot(CircleShape):
+    def __init__(self, x, y):
+        super().__init__(x, y, SHOT_RADIUS)
+
+    def update(self, dt):
+        self.position += self.velocity * dt
+
+    def draw(self, screen):
+        return pygame.draw.circle(screen, "white", self.position, self.radius, 2)
+