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#!/usr/bin/env python
'''
Copyright (C) 2004 Aaron Cyril Spike
This file is part of FretFind 2-D.
FretFind 2-D 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 2 of the License, or
(at your option) any later version.
FretFind 2-D 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 FretFind 2-D; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
'''
import math
def ETScale(tones, octave=2.0):
octave, tones = float(octave), float(tones)
scale = {'steps':[[1.0,1.0]], 'title':'', 'errors':0, 'errorstring':''}
if not tones:
scale['errors'] += 1
scale['errorstring'] = 'Error: Number of tones must be non zero!'
else:
ratio = octave**(1/tones)
scale['title'] = '%s root of %s Equal Temperament' % (tones, octave)
scale['steps'].append([ratio,1])
return scale
def ScalaScale(scala):
#initial step 0 or 1/1 is implicit
scale = {'steps':[[1.0,1.0]], 'title':'', 'errors':0, 'errorstring':''}
#split scale discarding commments
lines = [l.strip() for l in scala.strip().splitlines() if not l.strip().startswith('!')]
#first line may be blank and contains the title
scale['title'] = lines.pop(0)
#second line indicates the number of note lines that should follow
expected = int(lines.pop(0))
#discard blank lines and anything following whitespace
lines = [l.split()[0] for l in lines if l != '']
if len(lines) != expected:
scale['errors'] += 1
scale['errorstring'] = 'Error: expected %s more tones but found %s!' % (expected,len(lines))
else:
for l in lines:
#interpret anyline containing a dot as cents
if l.find('.') >= 0:
num = 2**(float(l)/1200)
denom = 1
#everything else is a ratio
elif l.find('/') >=0:
l = l.split('/')
num = float(int(l[0]))
denom = float(int(l[1]))
else:
num = float(int(l))
denom = 1.0
scale['steps'].append([num,denom])
if (num < 0) ^ (denom <= 0):
scale['errors'] += 1
scale['errorstring'] += 'Error at "'+l+'": Negative and undefined ratios are not allowed!\n'
return scale
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