Music: a tala goes round¶
A tala is a cycle of beats that comes round again and again. Here the bols sit round a circle, and the beat playing now glows. The sam, beat 1, is marked X, and a wave is marked 0. Keys 1 to 6 pick a tala. (This one uses real time, so the picture changes from run to run.)
How it works¶
- A tala is a repeating pattern of beats. The beats fall in groups called vibhags. You clap at the start of some groups (tali) and wave at the start of others (khali). Beat 1 is the sam, where the cycle begins and lands. A bol is the syllable a tabla player says for one beat, and the theka is the whole pattern of bols.
- f.talas() lists the six talas. f.tala_info(name) gives .beats, .vibhag, .tali, .khali, .sam and .bols.
- f.tala(info.name, tempo=TEMPO) makes one cycle with simple drum sounds. choose() stops the old cycle, makes a new one and loops it.
- Each frame, cycle.current_time() divided by the length of a beat says which beat is playing.
- Each bol sits at an angle on the circle, found with math.cos() and math.sin(). The beat that is playing glows gold.
- marks() decides the sign over each beat: X for the sam, 0 for a wave and 2, 3, ... for the other claps. key_pressed() reads the keys 1 to 6.
Make it yours¶
- Change TEMPO. A bigger number is faster.
- Start with another tala: change choose(0) in setup() to choose(2).
- Change the colour of the glow, f.fill(255, 200, 80, 90), or its size, 64.
- Print the bols when a tala is chosen: add print(info.bols) to the end of choose().
- Change the radius 150 of the circle. It is used for both x and y in draw().
The code¶
Copy it into a file and run it.
"""Music: a tala goes round
A tala is a cycle of beats that comes round again and again. Here the bols sit round a circle,
and the beat playing now glows. The sam, beat 1, is marked X, and a wave is marked 0. Keys 1 to
6 pick a tala.
How it works:
- A tala is a repeating pattern of beats. The beats fall in groups called vibhags. You clap at the
start of some groups (tali) and wave at the start of others (khali). Beat 1 is the sam, where
the cycle begins and lands. A bol is the syllable a tabla player says for one beat, and the
theka is the whole pattern of bols.
- f.talas() lists the six talas. f.tala_info(name) gives .beats, .vibhag, .tali, .khali, .sam
and .bols.
- f.tala(info.name, tempo=TEMPO) makes one cycle with simple drum sounds. choose() stops the old
cycle, makes a new one and loops it.
- Each frame, cycle.current_time() divided by the length of a beat says which beat is playing.
- Each bol sits at an angle on the circle, found with math.cos() and math.sin(). The beat that
is playing glows gold.
- marks() decides the sign over each beat: X for the sam, 0 for a wave and 2, 3, ... for the other
claps. key_pressed() reads the keys 1 to 6.
Make it yours:
- Change TEMPO. A bigger number is faster.
- Start with another tala: change choose(0) in setup() to choose(2).
- Change the colour of the glow, f.fill(255, 200, 80, 90), or its size, 64.
- Print the bols when a tala is chosen: add print(info.bols) to the end of choose().
- Change the radius 150 of the circle. It is used for both x and y in draw().
"""
# gallery: time-dependent
import math
import funground as f
TEMPO = 80
NAMES = f.talas()
info = None
cycle = None
def choose(index):
global info, cycle
if cycle:
cycle.stop()
info = f.tala_info(NAMES[index])
cycle = f.tala(info.name, tempo=TEMPO)
cycle.loop()
def setup():
f.size(560, 480)
choose(0)
def key_pressed():
if f.key and f.key in "123456":
choose(int(f.key) - 1)
def marks():
"""The sign over each beat: X for the sam, 0 for a wave, 2, 3, ... for the other claps."""
out = {}
clap = 2
for beat in sorted(info.tali + info.khali):
if beat == info.sam:
out[beat] = "X 0" if beat in info.khali else "X"
elif beat in info.khali:
out[beat] = "0"
else:
out[beat] = str(clap)
clap += 1
return out
def draw():
f.background("#10202a")
now = int(cycle.current_time() / (60 / TEMPO)) % info.beats + 1
signs = marks()
waved = set() # the beats of each vibhag that starts with a wave
start = 1
for size in info.vibhag:
if start in info.khali:
waved.update(range(start, start + size))
start += size
f.text_align("center", "center")
for beat, bol in enumerate(info.bols, start=1):
angle = math.radians(360 * (beat - 1) / info.beats - 90)
x = 280 + 150 * math.cos(angle)
y = 230 + 150 * math.sin(angle)
f.no_stroke()
if beat == now:
f.fill(255, 200, 80, 90)
f.circle(x, y, 64)
f.fill("gold" if beat == now else "#7fa6b8" if beat in waved else "#e0f0f0")
f.text_size(17 if len(bol) < 6 else 12)
f.text(bol, x, y)
if beat in signs:
f.fill("tomato" if beat == info.sam else "#7fd0c0")
f.text_size(15)
f.text(signs[beat], 280 + 196 * math.cos(angle), 230 + 196 * math.sin(angle))
f.fill("white")
f.text_size(28)
f.text(info.name, 280, 218)
f.text_size(15)
f.text(f"{info.beats} beats: {' + '.join(map(str, info.vibhag))}", 280, 248)
f.fill("#7fa6b8")
f.text_size(13)
f.text("keys: " + " ".join(f"{i + 1} {n}" for i, n in enumerate(NAMES)), 280, 462)
f.run()