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pentatonic.py
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pentatonic.py
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# pentatonic.py - create guitar pentatonic diagrams.
#
# Copyright (C) 2021 Alex Ellwein
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
from pyx import canvas, color, deco, document, path, style, text
class Pentatonic:
fret_width = 2
fret_height = 1
dot_rad = 0.1
note_rad = 0.3
frets = 16
tuning = ('E', 'A', 'D', 'G', 'B', 'E')
tones = ('C', 'C#', 'D', 'D#', 'E', 'F', 'F#', 'G', 'G#', 'A', 'A#', 'B')
tones2 = ('C', 'Db', 'D', 'Eb', 'E', 'F', 'Gb', 'G', 'Ab', 'A', 'Bb', 'B')
dotted = (3, 5, 7, 9, 15, 17, 19, 21)
double_dotted = (12, 24)
def __init__(self, x=0, y=0, ptype='Am'):
self.x = x
self.y = y
self.ptype = self._parse(ptype)
self.fretboard = self._fretboard()
self.penta = self._penta()
# print(self.penta)
def render(self, c, intervals=False):
c.stroke(self.fretboard, [style.linewidth.Thick])
# self._dots(c)
self._frets_legend(c)
self._penta_dots(c, intervals)
def _fretboard(self):
p = path.path()
for i in range(0, self.frets):
p.extend(self._fret(self.x + i*self.fret_width, self.y))
return p
def _fret(self, x, y):
p = path.path(
path.moveto(x, y),
path.lineto(x, y+5*self.fret_height),
path.moveto(x+self.fret_width, y),
path.lineto(x+self.fret_width, y+5*self.fret_height),
)
for i in range(0, 6):
p.append(path.moveto(x, y+i*self.fret_height))
p.append(path.lineto(x+self.fret_width, y+i*self.fret_height))
return p
def _frets_legend(self, c):
for i in range(1, self.frets + 1):
if i in self.dotted:
c.text(
self.x + (i - 1)*self.fret_width +
float(self.fret_width/2),
self.y + 5.5 * self.fret_height,
str(i)
)
if i in self.double_dotted:
c.text(
self.x + (i - 1)*self.fret_width +
float(self.fret_width/2),
self.y + 5.5 * self.fret_height,
str(i),
[color.rgb.blue]
)
def _dots(self, c):
for i in range(1, self.frets + 1):
if i in self.dotted:
c.fill(
path.circle(self.x + (i - 1)*self.fret_width + float(self.fret_width/2),
self.y + 2.5 * self.fret_height, self.dot_rad)
)
elif i in self.double_dotted:
c.fill(path.circle(self.x + (i-1) * self.fret_width +
float(self.fret_width/2), self.y + 1.5 * self.fret_height, self.dot_rad))
c.fill(path.circle(self.x + (i-1)*self.fret_width +
float(self.fret_width/2), self.y + 3.5 * self.fret_height, self.dot_rad))
def _parse(self, ptype):
if not ptype:
raise AttributeError('May not be empty')
minors = ptype.count('m')
if minors > 1 or (minors == 1 and not ptype.endswith('m')):
raise AttributeError(
'Minor type must be only once at last position')
minor = minors == 1
tone = ptype[:-1] if minor else ptype
if tone in self.tones:
note = self.tones.index(tone)
elif tone in self.tones2:
note = self.tones2.index(tone)
else:
raise AttributeError(
f'Tone must be one of: {set(*self.tones, *self.tones2)}')
return dict(tone=tone, note=note, minor=minor)
def _interval(self, base, pos):
idx = (base + pos) % 12
return dict(tone=self.tones[idx], note=idx)
def _penta(self):
# pentatonic means we get 1,2,3,5,6 from major scale
# or 1,b3,4,5,b7 from minor scale
if 'minor' in self.ptype and self.ptype['minor']:
return (
self.ptype,
self._interval(self.ptype['note'], 3), # flat 3
self._interval(self.ptype['note'], 5), # 4
self._interval(self.ptype['note'], 7), # 5
self._interval(self.ptype['note'], 10), # flat 7
)
else:
return (
self.ptype,
self._interval(self.ptype['note'], 2), # 2
self._interval(self.ptype['note'], 4), # 3
self._interval(self.ptype['note'], 7), # 5
self._interval(self.ptype['note'], 9), # 6
)
def _penta_dots(self, c, intervals=False):
penta_notes = tuple([i['note'] for i in self.penta])
def ival_by_idx(idx, minor):
return ('1', 'b3', '4', '5', 'b7')[idx] if minor else ('1', '2', '3', '5', '6')[idx]
for fret in range(0, self.frets + 1):
for string in range(0, 6):
note = self._interval(
self.tones.index(self.tuning[string]), fret)
if note['note'] in penta_notes:
idx = penta_notes.index(note['note'])
fret_x = self.x if fret == 0 else (
fret - 1) * self.fret_width + float(self.fret_width/2)
if idx != 0:
styles = [style.linewidth.Thick, deco.filled(
[color.rgb.black])] if not intervals else [style.linewidth.Thick, deco.filled([color.rgb.white])]
c.stroke(path.circle(fret_x, self.y + string *
self.fret_height, self.note_rad), styles)
if intervals:
tx = ival_by_idx(idx, self.ptype['minor'])
c.text(fret_x - self.dot_rad * (1.2 * len(tx)), self.y + string *
self.fret_height - self.dot_rad, tx)
else:
# root note
styles = [style.linewidth.Thick, deco.filled(
[color.rgb.black])] if not intervals else [style.linewidth.Thick, deco.filled([color.rgb.white])]
c.stroke(path.circle(fret_x, self.y + string * self.fret_height,
self.note_rad), [style.linewidth.Thick, deco.filled([color.rgb.red])])
if intervals:
tx = ival_by_idx(idx, self.ptype['minor'])
c.text(fret_x - self.dot_rad * (1.2 * len(tx)), self.y + string *
self.fret_height - self.dot_rad, tx, [color.rgb.white])
def main():
A4_lsc = document.paperformat(
document.paperformat.A4.height, document.paperformat.A4.width)
text.set(text.UnicodeEngine, fontname="cmss12", size=12)
pages = []
for i in (
('C', 'Am', 'C#', 'A#m'),
('D', 'Bm', 'D#', 'Cm'),
('E', 'C#m', 'F', 'Dm'),
('F#', 'D#m', 'G', 'Em'),
('G#', 'Fm', 'A', 'F#m'),
('A#', 'Gm', 'B', 'G#m')
):
c = canvas.canvas()
c.text(0, 32, f'{i[0]} Pentatonic Scale')
Pentatonic(0, 26, i[0]).render(c, intervals=True)
c.text(0, 24, f'{i[1]} Pentatonic Scale')
Pentatonic(0, 18, i[1]).render(c, intervals=True)
c.text(0, 16, f'{i[2]} Pentatonic Scale')
Pentatonic(0, 10, i[2]).render(c, intervals=True)
c.text(0, 8, f'{i[3]} Pentatonic Scale')
Pentatonic(0, 2, i[3]).render(c, intervals=True)
page = document.page(c, paperformat=A4_lsc, fittosize=1, margin=2)
pages.append(page)
doc = document.document(pages=pages)
doc.writePDFfile("pentatonic")
if __name__ == "__main__":
main()