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4vv_timelines.py
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4vv_timelines.py
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# -*- coding: utf-8 -*-
# author: Sam Howes <samuel.howes@mail.mcgill.ca>
"""
This script creates graphical representations of four-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., 4vv_timelines.py decens_24.csv portio_36.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)
textures = [] # a list of the textures of each of the sonorities
results = [] # a list of the results represented as letters
with open(arg) as csvfile:
readCSV = csv.reader(csvfile, delimiter = ',')
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] != '':
# append everything but the offset number (as a list)
rows.append(row[-6:])
# get sonorities
for r in rows:
# if 3 or more voices have rests
if r.count('Rest') > 5:
s = ['Rest']
# if voice 3 has a rest
elif r[2] == r[4] == r[5] == 'Rest':
# if voice 2 also has a rest
if r[1] == r[3] == 'Rest':
s = [r[0]]
# if voice 2 has a note
else:
if '-' in r[3]:
s = [r[0], r[3]]
elif '-' in r[1]:
s = [r[0], r[1]]
else:
s = [r[1], r[3]]
# if all four voices have notes
elif r[2] != 'Rest' and r[4] != 'Rest' and r[5] != 'Rest':
if '-' in r[5]:
s = [r[1], r[3], r[5]]
elif '-' in r[4]:
s = [r[0], r[3], r[4]]
else:
s = [r[2], r[4], r[5]]
# if voice 3 has a note and at least one of the other 3 voices has a rest
else:
if '-' in r[5] and 'Rest' in r[1]:
s = [r[3], r[5]]
elif '-' in r[5] and 'Rest' in r[3]:
s = [r[1], r[5]]
elif '-' in r[4] and 'Rest' in r[5]:
s = [r[0], r[4]]
elif '-' in r[4] and 'Rest' in r[0]:
s = [r[3], r[4]]
else:
s = [r[2], r[4], r[5]]
sonorities.append(s)
#get textures
for s in sonorities:
if len(s) == 3:
if s[0] == 'Rest' and s[1] != 'Rest' and s[2] != 'Rest':
t = ['R', 'N', 'N', 'N']
elif s[0] != 'Rest' and s[1] == 'Rest' and s[2] != 'Rest':
t = ['N', 'R', 'N', 'N']
elif s[0] != 'Rest' and s[1] != 'Rest' and s[2] == 'Rest':
t = ['N', 'N', 'R', 'N']
elif s[0] == s[1] == 'Rest' and s[2] != 'Rest':
t = ['R', 'R', 'N', 'N']
elif s[0] == s[2] == 'Rest' and s[1] != 'Rest':
t = ['R', 'N', 'R', 'N']
elif s[1] == s[2] == 'Rest' and s[0] != 'Rest':
t = ['N', 'R', 'R', 'N']
else:
t = ['N', 'N', 'N', 'N']
elif len(s) == 2:
if s[0] != 'Rest' and s[1] != 'Rest':
t = ['N', 'N', 'N', 'R']
elif s[0] == 'Rest':
t = ['R', 'N', 'N', 'R']
elif s[1] == 'Rest':
t = ['N', 'R', 'N', 'R']
else:
if s[0] == 'Rest':
t = ['R', 'R', 'R', 'R']
else:
t = ['N', 'N', 'R', 'R']
textures.append(t)
# get results
for s in sonorities:
ss = str(s)
if ss == 'Rest':
results.append('R')
elif any(x in ss for x in ['d', 'A', '2', '7', '4']):
results.append('D')
elif '5' in ss and '6' in ss: # the only special case
results.append('D')
elif '3' in ss and '6' in ss:
results.append('B')
elif ('3' in ss or '6' in ss) and not ('5' in ss or '8' in ss):
results.append('I')
elif '3' not in ss and '6' not in ss:
results.append('P')
else:
results.append('M')
# make a graph of the results
size = ((len(results)*22), 100)
img = Image.new('RGB', size, 'white')
def draw_black_line(img, X2):
"draws a black line"
for x in range(X2, (X2 + 2)):
for y in range(0, 100):
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[results[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(results):
j = 0
while j < 4:
X1 = i*22
Y1 = j*25
X2 = X1 + 20
Y2 = Y1 + 25
if textures[i][j] == 'N':
if results[i] == 'D':
draw_hatch_2(img, X1, Y1, X2, Y2)
elif results[i] == 'I':
draw_hatch_1(img, X1, Y1, X2, Y2)
elif results[i] == 'B':
draw_hatch_3(img, X1, Y1, X2, Y2)
else:
draw_band(img, X1, Y1, X2, Y2)
j = j + 1
draw_black_line(img, (i*22 + 20))
i = i + 1
print('Writing ' + str(arg[:-4]) + '.png')
img.save(str(arg[:-4]) + '.png')