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162 lines
4.6 KiB
Python
162 lines
4.6 KiB
Python
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# patArpeggio.py
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"""
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This module is an integeral part of the program
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MMA - Musical Midi Accompaniment.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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Bob van der Poel <bob@mellowood.ca>
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"""
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import random
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import gbl
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from MMA.notelen import getNoteLen
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from MMA.common import *
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from MMA.harmony import harmonize
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from MMA.pat import PC
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class Arpeggio(PC):
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""" Pattern class for an arpeggio track. """
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vtype = 'ARPEGGIO'
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arpOffset = -1
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arpDirection = 1
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def getPgroup(self, ev):
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""" Get group for apreggio pattern.
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Fields - start, length, volume
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"""
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a = struct()
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if len(ev) != 3:
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error("There must be exactly 3 items in each group "
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"for apreggio define, not '%s'" % ' '.join(ev) )
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a.offset = self.setBarOffset(ev[0])
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a.duration = getNoteLen(ev[1])
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a.vol = stoi(ev[2], "Type error in Arpeggio definition")
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return a
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def restart(self):
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self.ssvoice = -1
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self.arpOffset=-1
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self.arpDirection=1
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def trackBar(self, pattern, ctable):
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""" Do a arpeggio bar.
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Called from self.bar()
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"""
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sc = self.seq
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direct = self.direction[sc]
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for p in pattern:
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tb = self.getChordInPos(p.offset, ctable)
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if tb.arpeggioZ:
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continue
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if direct == 'DOWN':
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self.arpDirection = -1
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if self.chordLimit:
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tb.chord.limit(self.chordLimit)
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if self.compress[sc]:
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tb.chord.compress()
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if self.invert[sc]:
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tb.chord.invert(self.invert[sc])
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# This should be optimized, it recreates the chord for every pattern.
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# Problem is that one would need to check all the LIMIT, COMPRESS, etc
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# settings each for each bar as well, so it's probably just as easy to
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# leave it as is. Besides, this works.
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ln = self.chordRange[sc]
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o = 0
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ourChord = []
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while ln >= 1:
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for a in tb.chord.noteList:
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ourChord.append(a+o)
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ln -= 1
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o += 12
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if ln > 0 and ln < 1: # for fractional lengths
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ln = int(tb.chord.noteListLen * ln)
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if ln < 2: # important, min of 2 notes in arp.
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ln=2
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for a in tb.chord.noteList[:ln]:
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ourChord.append(a+o)
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if direct == 'BOTH':
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if self.arpOffset < 0:
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self.arpOffset = 1
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self.arpDirection = 1
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elif self.arpOffset >= len(ourChord):
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self.arpOffset = len(ourChord)-2
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self.arpDirection = -1
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elif direct == 'UP':
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if self.arpOffset >= len(ourChord) or self.arpOffset < 0:
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self.arpOffset = 0
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self.arpDirection = 1
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elif direct == 'DOWN':
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if self.arpOffset < 0 or self.arpOffset >= len(ourChord):
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self.arpOffset = len(ourChord)-1
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self.arpDirection = -1
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if direct == 'RANDOM':
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note = random.choice(ourChord)
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else:
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note = ourChord[self.arpOffset]
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self.arpOffset += self.arpDirection
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if not self.harmonyOnly[sc]:
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self.sendNote(
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p.offset,
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self.getDur(p.duration),
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self.adjustNote(note),
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self.adjustVolume(p.vol, p.offset) )
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if self.harmony[sc]:
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h = harmonize(self.harmony[sc], note, ourChord)
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for n in h:
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self.sendNote(
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p.offset,
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self.getDur(p.duration),
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self.adjustNote(n),
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self.adjustVolume(p.vol * self.harmonyVolume[sc], -1) )
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tb.chord.reset() # important, other tracks chord object
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