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3vv_timelines.py
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3vv_timelines.py
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# -*- coding: utf-8 -*-
# author: Sam Howes <samuel.howes@mail.mcgill.ca>
"""
This script creates graphical representations of three-voice textures.
It uses the CSV output of the vertical interval indexer. It shades perfect
and mixed sonorities (according to Fuller (1986)) dark and light grey,
respectively. Dissonant sonorities are shaded with the function hatch_2,
doubly imperfect sonorities are shaded with hatch_3, and imperfect
sonorities are shaded with hatch_1. White bands indicate rests or solos
within the texture. CSV files should be passed as arguments when executing
the script, e.g., 3vv_timelines.py hugo_12.csv nazarea_18.csv
"""
import sys, csv
from PIL import Image, ImageColor
colP = (65, 65, 65)
colM = (160, 160, 160)
colR = (255, 255, 255)
colours = {'R': colR, 'P': colP, 'RRP': colP, 'RPR': colP, 'PRR': colP, 'M': colM,}
if len(sys.argv) == 1:
print('\n> Please specify a file(s)')
for arg in sys.argv[1:]:
rows = [] # a list of the rows in the CSV file
sonorities = [] # a list of the sonorities in each row (as strings)
with open(arg) as csvfile:
readCSV = csv.reader(csvfile, delimiter = ',')
# make a list of the rows
for row in readCSV:
# skip the first three rows that don't have any data
if row[0] != 'Indexer' and row[0] != 'Parts' and row[0] != '':
# if there are any rests in the texture, record all 3 columns
if 'Rest' in row:
rows.append(row[-3:])
# if S is lowest sounding voice, record columns 1 & 2
elif '-' in row[1] and '-' in row[2]:
rows.append(row[1:3])
# if A is lowest sounding voice, record columns 1 & 3
elif '-' not in row[1] and '-' in row[3]:
rows.append([row[1], row[3]])
# if T is lowest sounding voice, record columns 2 & 3
else:
rows.append(row[-2:])
for r in rows:
s = str(r)
if 'Rest' in r:
# columns 1 & 2 are rests (single interval between A & T)
if r[0] == r[1] == 'Rest' and r[2] != 'Rest':
if any(x in s for x in ['d', 'A', '2', '7', '4']):
sonorities.append('RRD')
elif 'P' in s:
sonorities.append('RRP')
else:
sonorities.append('RRI')
# columns 1 & 3 are rests (single interval between S & T)
elif r[0] == r[2] == 'Rest' and r[1] != 'Rest':
if any(x in s for x in ['d', 'A', '2', '7', '4']):
sonorities.append('RDR')
elif 'P' in s:
sonorities.append('RPR')
else:
sonorities.append('RIR')
# columns 2 & 3 are rests (single interval between S & A)
elif r[0] != 'Rest' and r[1] == r[2] == 'Rest':
if any(x in s for x in ['d', 'A', '2', '7', '4']):
sonorities.append('DRR')
elif 'P' in s:
sonorities.append('PRR')
else:
sonorities.append('IRR')
# all columns are rests
else:
sonorities.append('R')
# now what remain are full 3vv sonorities (no rests)
# first remove dissonances
elif any(x in s for x in ['d', 'A', '2', '7', '4']):
sonorities.append('D')
# the only special dissonance (a six-five chord)
elif '5' in s and '6' in s:
sonorities.append('D')
# doubly imperfect sonorities
elif '3' in s and '6' in s:
sonorities.append('B')
# imperfect sonorities
elif ('3' in s or '6' in s) and not ('5' in s or '8' in s):
sonorities.append('I')
# perfect sonorities
elif '3' not in s and '6' not in s:
sonorities.append('P')
# mixed sonorities (all that's left)
else:
sonorities.append('M')
# making a graph of the sonorities
size = (len(sonorities)*22, 99)
img = Image.new('RGB', size, 'white')
FULL = ['R', 'P', 'M', 'I', 'B', 'D']
SA = ['PRR', 'IRR', 'DRR']
ST = ['RPR', 'RIR', 'RDR']
AT = ['RRP', 'RRI', 'RRD']
DISS = ['D', 'RRD', 'RDR', 'DRR']
IMP = ['I', 'RRI', 'RIR', 'IRR']
def draw_black_line(img, X2):
"draws a black line"
for x in range(X2, (X2 + 2)):
for y in range(0, 99):
img.putpixel((x, y), ImageColor.getcolor('black', 'RGB'))
return None
def draw_band(img, X1, Y1, X2, Y2):
"fills in the specified band with solid colour"
for x in range(X1, X2):
for y in range(Y1, Y2):
img.putpixel((x, y), colours[sonorities[i]])
return None
def draw_hatch_1(img, X1, Y1, X2, Y2):
"draws a horizontal hatch pattern"
k = 0
for y in range(Y1, Y2):
for x in range(X1, X2):
if k % 5 == 0:
img.putpixel((x, y), ImageColor.getcolor('black', 'RGB'))
k = k + 1
return None
def draw_hatch_2(img, X1, Y1, X2, Y2):
"draws a diagonal hatch pattern"
m = 0
for y in range(Y1, Y2):
for x in range(X1, X2):
if m % 7 == 0:
img.putpixel((x, y), ImageColor.getcolor('black', 'RGB'))
m = m + 1
return None
def draw_hatch_3(img, X1, Y1, X2, Y2):
"draws a vertical hatch pattern"
n = 0
for x in range(X1, X2):
for y in range(Y1, Y2):
if n % 4 == 0:
img.putpixel((x, y), ImageColor.getcolor('black', 'RGB'))
n = n + 1
return None
i = 0
while i < len(sonorities):
if sonorities[i] in FULL:
X1 = i*22
Y1 = 0
X2 = X1 + 20
Y2 = 99
split = False
elif sonorities[i] in SA:
X1 = i*22
Y1 = 0
X2 = X1 + 20
Y2 = 66
split = False
elif sonorities[i] in AT:
X1 = i*22
Y1 = 33
X2 = X1 + 20
Y2 = 99
split = False
else:
X1 = i*22
Y1 = 0
X2 = X1 + 20
Y2 = 33
split = True
if sonorities[i] in DISS:
draw_hatch_2(img, X1, Y1, X2, Y2)
draw_black_line(img, X2)
elif sonorities[i] in IMP:
draw_hatch_1(img, X1, Y1, X2, Y2)
draw_black_line(img, X2)
elif sonorities[i] == 'B':
draw_hatch_3(img, X1, Y1, X2, Y2)
draw_black_line(img, X2)
else:
draw_band(img, X1, Y1, X2, Y2)
draw_black_line(img, X2)
if split:
if sonorities[i] in DISS:
draw_hatch_2(img, X1, Y1 + 66, X2, Y2 + 66)
elif sonorities[i] in IMP:
draw_hatch_1(img, X1, Y1 + 66, X2, Y2 + 66)
else:
draw_band(img, X1, Y1 + 66, X2, Y2 + 66)
i = i + 1
print('Writing ' + str(arg[:-4]) + '.png')
img.save(str(arg[:-4]) + '.png')