Background Music¶
background_music.py¶
1"""
2Background Music Example
3
4If Python and Arcade are installed, this example can be run from the command line with:
5python -m arcade.examples.background_music
6"""
7import arcade
8import time
9
10SCREEN_WIDTH = 600
11SCREEN_HEIGHT = 300
12SCREEN_TITLE = "Starting Template Simple"
13MUSIC_VOLUME = 0.5
14
15
16class MyGame(arcade.Window):
17 """ Main application class. """
18
19 def __init__(self, width, height, title):
20 super().__init__(width, height, title)
21
22 arcade.set_background_color(arcade.color.WHITE)
23
24 # Variables used to manage our music. See setup() for giving them
25 # values.
26 self.music_list = []
27 self.current_song_index = 0
28 self.current_player = None
29 self.music = None
30
31 def advance_song(self):
32 """ Advance our pointer to the next song. This does NOT start the song. """
33 self.current_song_index += 1
34 if self.current_song_index >= len(self.music_list):
35 self.current_song_index = 0
36 print(f"Advancing song to {self.current_song_index}.")
37
38 def play_song(self):
39 """ Play the song. """
40 # Stop what is currently playing.
41 if self.music:
42 self.music.stop()
43
44 # Play the next song
45 print(f"Playing {self.music_list[self.current_song_index]}")
46 self.music = arcade.Sound(self.music_list[self.current_song_index], streaming=True)
47 self.current_player = self.music.play(MUSIC_VOLUME)
48 # This is a quick delay. If we don't do this, our elapsed time is 0.0
49 # and on_update will think the music is over and advance us to the next
50 # song before starting this one.
51 time.sleep(0.03)
52
53 def setup(self):
54 """ Set up the game here. Call this function to restart the game. """
55
56 # List of music
57 self.music_list = [":resources:music/funkyrobot.mp3", ":resources:music/1918.mp3"]
58 # Array index of what to play
59 self.current_song_index = 0
60 # Play the song
61 self.play_song()
62
63 def on_draw(self):
64 """ Render the screen. """
65
66 arcade.start_render()
67
68 position = self.music.get_stream_position(self.current_player)
69 length = self.music.get_length()
70
71 size = 20
72 margin = size * .5
73
74 # Print time elapsed and total
75 y = SCREEN_HEIGHT - (size + margin)
76 text = f"{int(position) // 60}:{int(position) % 60:02} of {int(length) // 60}:{int(length) % 60:02}"
77 arcade.draw_text(text, 0, y, arcade.csscolor.BLACK, size)
78
79 # Print current song
80 y -= size + margin
81 text = f"Currently playing: {self.music_list[self.current_song_index]}"
82 arcade.draw_text(text, 0, y, arcade.csscolor.BLACK, size)
83
84 def on_update(self, dt):
85
86 position = self.music.get_stream_position(self.current_player)
87
88 # The position pointer is reset to 0 right after we finish the song.
89 # This makes it very difficult to figure out if we just started playing
90 # or if we are doing playing.
91 if position == 0.0:
92 self.advance_song()
93 self.play_song()
94
95
96def main():
97 """ Main method """
98 window = MyGame(SCREEN_WIDTH, SCREEN_HEIGHT, SCREEN_TITLE)
99 window.setup()
100 arcade.run()
101
102
103if __name__ == "__main__":
104 main()