Final exam version

venv/lib/python3.12/site-packages/pygame/examples/moveit.py

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+#!/usr/bin/env python
+""" pygame.examples.moveit
+
+This is the full and final example from the Pygame Tutorial,
+"How Do I Make It Move". It creates 10 objects and animates
+them on the screen.
+
+It also has a separate player character that can be controlled with arrow keys.
+
+Note it's a bit scant on error checking, but it's easy to read. :]
+Fortunately, this is python, and we needn't wrestle with a pile of
+error codes.
+"""
+import os
+import pygame as pg
+
+main_dir = os.path.split(os.path.abspath(__file__))[0]
+
+# Height and Width of screen
+WIDTH = 640
+HEIGHT = 480
+# Height and width of the sprite
+SPRITE_WIDTH = 80
+SPRITE_HEIGHT = 60
+
+
+# our game object class
+class GameObject:
+    def __init__(self, image, height, speed):
+        self.speed = speed
+        self.image = image
+        self.pos = image.get_rect().move(0, height)
+
+    # move the object.
+    def move(self, up=False, down=False, left=False, right=False):
+        if right:
+            self.pos.right += self.speed
+        if left:
+            self.pos.right -= self.speed
+        if down:
+            self.pos.top += self.speed
+        if up:
+            self.pos.top -= self.speed
+
+        # controls the object such that it cannot leave the screen's viewpoint
+        if self.pos.right > WIDTH:
+            self.pos.left = 0
+        if self.pos.top > HEIGHT - SPRITE_HEIGHT:
+            self.pos.top = 0
+        if self.pos.right < SPRITE_WIDTH:
+            self.pos.right = WIDTH
+        if self.pos.top < 0:
+            self.pos.top = HEIGHT - SPRITE_HEIGHT
+
+
+# quick function to load an image
+def load_image(name):
+    path = os.path.join(main_dir, "data", name)
+    return pg.image.load(path).convert()
+
+
+# here's the full code
+def main():
+    pg.init()
+    clock = pg.time.Clock()
+    screen = pg.display.set_mode((WIDTH, HEIGHT))
+
+    player = load_image("player1.gif")
+    entity = load_image("alien1.gif")
+    background = load_image("liquid.bmp")
+
+    # scale the background image so that it fills the window and
+    # successfully overwrites the old sprite position.
+    background = pg.transform.scale2x(background)
+    background = pg.transform.scale2x(background)
+
+    screen.blit(background, (0, 0))
+
+    objects = []
+    p = GameObject(player, 10, 3)
+    for x in range(10):
+        o = GameObject(entity, x * 40, x)
+        objects.append(o)
+
+    pg.display.set_caption("Move It!")
+
+    # This is a simple event handler that enables player input.
+    while True:
+        # Get all keys currently pressed, and move when an arrow key is held.
+        keys = pg.key.get_pressed()
+        if keys[pg.K_UP]:
+            p.move(up=True)
+        if keys[pg.K_DOWN]:
+            p.move(down=True)
+        if keys[pg.K_LEFT]:
+            p.move(left=True)
+        if keys[pg.K_RIGHT]:
+            p.move(right=True)
+
+        # Draw the background
+        screen.blit(background, (0, 0))
+        for e in pg.event.get():
+            # quit upon screen exit
+            if e.type == pg.QUIT:
+                return
+        for o in objects:
+            screen.blit(background, o.pos, o.pos)
+        for o in objects:
+            o.move(right=True)
+            screen.blit(o.image, o.pos)
+        screen.blit(p.image, p.pos)
+        clock.tick(60)
+        pg.display.update()
+        pg.time.delay(100)
+
+
+if __name__ == "__main__":
+    main()
+    pg.quit()