Basic gameplay.

main.py

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+import pygame, random, sys
+
+# global variables
+windowWidth = 800
+windowHeight = 800
+fps = 60
+
+# initialize pygame and create a window
+pygame.init()
+clock = pygame.time.Clock()
+window = pygame.display.set_mode((windowWidth, windowHeight))
+pygame.display.set_caption("Pygame Dodger")
+pygame.mouse.set_visible(False)
+
+# create a quit function
+def terminate():
+    pygame.quit()
+    sys.exit()
+
+def redrawGameWindow():
+    window.fill((0,0,0))
+    
+    for baddie in baddies:
+        baddie.draw(window)
+    man.draw(window)
+    
+    pygame.display.update()
+
+# enemy class
+class enemy(object):
+    def __init__(self):
+        self.startLine = 100
+        self.endLine = 700
+        self.minSize = 10
+        self.maxSize = 40
+        self.minSpeed = 1
+        self.maxSpeed = 8
+        self.y = 10
+        self.x = random.randint(self.startLine, self.endLine)
+        self.width = self.height = random.randint(self.minSize, self.maxSize)
+        self.vel = random.randint(self.minSpeed, self.maxSpeed)
+        self.hitbox = pygame.Rect(self.x, self.y, self.width, self.height)
+        
+    def draw(self, window):
+        pygame.draw.rect(window, (255,0,0), (self.x, self.y, self.width, self.height))
+    
+    def move(self):
+        self.hitbox = pygame.Rect(self.x, self.y, self.width, self.height)
+        self.y += self.vel
+
+# player class
+class player(object):
+    def __init__(self, x, y, width, height):
+        self.x = x
+        self.y = y
+        self.width = width
+        self.height = height
+        self.isAlive = True
+        self.moveSpeed = 5
+        self.hitbox = pygame.Rect(self.x, self.y, self.width, self.height)
+    
+    def draw(self, window):
+        pygame.draw.rect(window, (0,255,0), (self.x, self.y, self.width, self.height))
+        
+    def move(self, keys):
+        self.hitbox = pygame.Rect(self.x, self.y, self.width, self.height)
+        if keys[pygame.K_RIGHT] and self.x < windowWidth - self.width - 50:
+            self.x += self.moveSpeed
+        if keys[pygame.K_LEFT] and self.x > 0 + 50:
+            self.x -= self.moveSpeed
+        if keys[pygame.K_UP] and self.y > 0 + windowWidth / 2:
+            self.y -= self.moveSpeed
+        if keys[pygame.K_DOWN] and self.y < windowHeight - self.height - 50:
+            self.y += self.moveSpeed
+        
+
+man = player(100, 700, 30, 30)
+baddies = []
+baddieSpawnRate = 40
+timer = 0
+
+# main loop
+run = True
+while run:
+    if timer % baddieSpawnRate == 0:
+        baddies.append(enemy())
+    
+    for baddie in baddies:
+        baddie.move()
+        
+        if man.hitbox.colliderect(baddie.hitbox):
+            run = False
+        
+        if baddie.y + baddie.height + 10 > windowHeight:
+            baddies.pop(baddies.index(baddie))
+    
+    keys = pygame.key.get_pressed()
+    
+    clock.tick(fps)
+    
+    man.move(keys)
+    
+    redrawGameWindow()
+    
+    timer += 1
+    
+    for event in pygame.event.get():
+        if event.type == pygame.QUIT:
+            run = False
+    
+    if keys[pygame.K_ESCAPE]:
+        run = False
+
+terminate()