Merge pull request #3181 from damusss/__main__-guard-examples

Add main guard to examples (+ incredibly small fixes)

examples/README.rst

@@ -78,6 +78,9 @@ music_drop_fade.py
    several events.  Uses fade_ms added in pygame2, as well as set_endevent,
    set_volume, drag and drop events, and the scrap module.
 
+ninepatch.py
+   Demonstrate the purpose of the 9-patch scale method and a way to implement it.
+
 pixelarray.py
    Process whole arrays of pixels at a time.
    Like numpy, but for pixels, and also built into pygame.

examples/audiocapture.py

@@ -18,14 +18,6 @@
 )
 from pygame._sdl2.mixer import set_post_mix
 
-
-pygame.mixer.pre_init(44100, 32, 2, 512)
-pygame.init()
-
-# init_subsystem(INIT_AUDIO)
-names = get_audio_device_names(True)
-print(names)
-
 sounds = []
 sound_chunks = []
 
@@ -49,31 +41,42 @@ def postmix_callback(postmix, audiomemoryview):
     print(postmix)
 
 
-set_post_mix(postmix_callback)
+def main():
+    pygame.mixer.pre_init(44100, 32, 2, 512)
+    pygame.init()
 
-audio = AudioDevice(
-    devicename=names[0],
-    iscapture=True,
-    frequency=44100,
-    audioformat=AUDIO_F32,
-    numchannels=2,
-    chunksize=512,
-    allowed_changes=AUDIO_ALLOW_FORMAT_CHANGE,
-    callback=callback,
-)
-# start recording.
-audio.pause(0)
+    # init_subsystem(INIT_AUDIO)
+    names = get_audio_device_names(True)
+    print(names)
+
+    set_post_mix(postmix_callback)
+
+    audio = AudioDevice(
+        devicename=names[0],
+        iscapture=True,
+        frequency=44100,
+        audioformat=AUDIO_F32,
+        numchannels=2,
+        chunksize=512,
+        allowed_changes=AUDIO_ALLOW_FORMAT_CHANGE,
+        callback=callback,
+    )
+    # start recording.
+    audio.pause(0)
+
+    print(audio)
 
-print(audio)
+    print(f"recording with '{names[0]}'")
+    time.sleep(5)
 
-print(f"recording with '{names[0]}'")
-time.sleep(5)
+    print("Turning data into a pygame.mixer.Sound")
+    sound = pygame.mixer.Sound(buffer=b"".join(sound_chunks))
 
+    print("playing back recorded sound")
+    sound.play()
+    time.sleep(5)
+    pygame.quit()
 
-print("Turning data into a pygame.mixer.Sound")
-sound = pygame.mixer.Sound(buffer=b"".join(sound_chunks))
 
-print("playing back recorded sound")
-sound.play()
-time.sleep(5)
-pygame.quit()
+if __name__ == "__main__":
+    main()

examples/font_viewer.py

@@ -122,7 +122,7 @@ def render_fonts(self, text="A display of font &N"):
             line = text.replace("&N", name)
             try:
                 surf = font.render(
-                    line, 1, color, self.back_color, self.screen_size[0] - 20
+                    line, True, color, self.back_color, self.screen_size[0] - 20
                 )
             except pygame.error as e:
                 print(e)
@@ -281,5 +281,6 @@ def handle_events(self):
         return True
 
 
-viewer = FontViewer()
-pygame.quit()
+if __name__ == "__main__":
+    viewer = FontViewer()
+    pygame.quit()

examples/go_over_there.py

@@ -19,10 +19,6 @@
 SCREEN_SIZE = pygame.Vector2(1000, 600)
 CIRCLE_RADIUS = 5
 
-pygame.init()
-screen = pygame.display.set_mode(SCREEN_SIZE)
-clock = pygame.Clock()
-
 target_position = None
 balls = []
 
@@ -49,35 +45,47 @@ def reset():
         balls.append(b)
 
 
-reset()
-delta_time = 0
-running = True
-while running:
-    for event in pygame.event.get():
-        if event.type == pygame.QUIT:
-            running = False
+def main():
+    global target_position
+    global balls
 
-        if event.type == pygame.MOUSEBUTTONUP:
-            target_position = pygame.mouse.get_pos()
+    pygame.init()
+    screen = pygame.display.set_mode(SCREEN_SIZE)
+    clock = pygame.Clock()
 
-        if event.type == pygame.KEYUP:
-            if event.key == pygame.K_ESCAPE:
+    reset()
+    delta_time = 0
+    running = True
+    while running:
+        for event in pygame.event.get():
+            if event.type == pygame.QUIT:
                 running = False
 
-            if event.key == pygame.K_r:
-                reset()
+            if event.type == pygame.MOUSEBUTTONUP:
+                target_position = pygame.mouse.get_pos()
+
+            if event.type == pygame.KEYUP:
+                if event.key == pygame.K_ESCAPE:
+                    running = False
 
-    screen.fill((31, 143, 65))
+                if event.key == pygame.K_r:
+                    reset()
+
+        screen.fill((31, 143, 65))
+
+        for o in balls:
+            if target_position is not None:
+                o.position.move_towards_ip(target_position, o.speed * delta_time)
+            pygame.draw.circle(screen, (118, 207, 145), o.position, CIRCLE_RADIUS)
+
+        pygame.display.flip()
+        delta_time = clock.tick(60)
+        pygame.display.set_caption(
+            f"fps: {round(clock.get_fps(), 2)}, ball count: {len(balls)}"
+        )
 
-    for o in balls:
-        if target_position is not None:
-            o.position.move_towards_ip(target_position, o.speed * delta_time)
-        pygame.draw.circle(screen, (118, 207, 145), o.position, CIRCLE_RADIUS)
+    pygame.quit()
 
-    pygame.display.flip()
-    delta_time = clock.tick(60)
-    pygame.display.set_caption(
-        f"fps: {round(clock.get_fps(), 2)}, ball count: {len(balls)}"
-    )
 
-pygame.quit()
+if __name__ == "__main__":
+    main()