Adding Player, movement, and drawing/updating functionality

circleshape.py

@@ -0,0 +1,22 @@
+import pygame
+
+# Base class for game objects
+class CircleShape(pygame.sprite.Sprite):
+    def __init__(self, x, y, radius):
+        # we will be using this later
+        if hasattr(self, "containers"):
+            super().__init__(self.containers)
+        else:
+            super().__init__()
+
+        self.position = pygame.Vector2(x, y)
+        self.velocity = pygame.Vector2(0, 0)
+        self.radius = radius
+
+    def draw(self, screen):
+        # sub-classes must override
+        pass
+
+    def update(self, dt):
+        # sub-classes must override
+        pass

constants.py

@@ -1,6 +1,10 @@
 SCREEN_WIDTH = 1280
 SCREEN_HEIGHT = 720
 
+PLAYER_RADIUS = 20
+PLAYER_TURN_SPEED = 300
+PLAYER_SPEED = 200
+
 ASTEROID_MIN_RADIUS = 20
 ASTEROID_KINDS = 3
 ASTEROID_SPAWN_RATE = 0.8  # seconds

main.py

@@ -2,20 +2,34 @@
 # the open-source pygame library
 # throughout this file
 import pygame
-from constants import *
+from constants import SCREEN_HEIGHT, SCREEN_WIDTH
+from player import Player
 
 def main():
     pygame.init()
-    print("Starting asteroids!")
-    print(f"Screen width: {SCREEN_WIDTH}")
-    print(f"Screen height: {SCREEN_HEIGHT}")
+    clock = pygame.time.Clock()
+    dt = 0
     screen = pygame.display.set_mode((SCREEN_WIDTH, SCREEN_HEIGHT))
+    player = Player(SCREEN_WIDTH / 2, SCREEN_HEIGHT / 2)
+    updatable = []
+    drawable = []
+    updatable.append(player)
+    drawable.append(player)
 
     while True:
         for event in pygame.event.get():
             if event.type == pygame.QUIT:
                 return
-        pygame.Surface.fill(screen, (0, 0, 0))
+        screen.fill("black")
+        # limit the framerate to 60 FPS
+        dt = clock.tick(60) / 1000
+
+        for object in drawable:
+            object.draw(screen)
+        
+        for object in updatable:
+            object.update(dt)
+
         pygame.display.flip()
 
 if __name__ == "__main__":

player.py

@@ -0,0 +1,39 @@
+import pygame
+from circleshape import CircleShape
+from constants import PLAYER_RADIUS, PLAYER_TURN_SPEED, PLAYER_SPEED
+
+class Player(CircleShape):
+    def __init__(self, x, y):
+        super().__init__(x, y, PLAYER_RADIUS)
+        self.rotation = 0
+
+    def rotate(self, dt):
+        self.rotation += PLAYER_TURN_SPEED * dt
+
+    def move(self, dt):
+        forward = pygame.Vector2(0, 1).rotate(self.rotation)
+        self.position += forward * PLAYER_SPEED * dt
+
+    def update(self, dt):
+        keys = pygame.key.get_pressed()
+
+        if keys[pygame.K_a]:
+            self.rotate(dt)
+        if keys[pygame.K_d]:
+            self.rotate(-dt)
+        if keys[pygame.K_w]:
+            self.move(dt)
+        if keys[pygame.K_s]:
+            self.move(-dt)
+
+    # 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)