khodowany
63 lines
3.4 KiB
Python
63 lines
3.4 KiB
Python
"""Complete generated rhythm groups, indexed once, independent of source rhythms."""
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from fractions import Fraction as F
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from generator import vocabulary
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from generator.solo import groups, policy
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class Rhythms:
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def __init__(self, library, tempo):
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self.groups=[]; limits=vocabulary.data('roles')['difficulty']
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for item in vocabulary.data('solo')['groups']:
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difficulty=item.get('difficulty')
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if difficulty and tempo>limits[difficulty+'_max_bpm']:continue
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cursor=F();pattern=[]
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for value in item['values']:
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duration=F(value.removeprefix('r:'))
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if not value.startswith('r:'):pattern.append((cursor,cursor+duration))
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cursor+=duration
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self.groups.append((item['id'],tuple(pattern),cursor,tuple(item['purpose'])))
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for cell in vocabulary.rhythm_cells(tempo):
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# Imported authored cells remain whole. They are never sliced to fit.
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if groups.valid(cell.pattern):self.groups.append((cell.id,cell.pattern,cell.duration,('develop','answer') if cell.purpose=='answer' else ('arpeggio','scalar','develop','neighbor')))
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# Meter-indexed catalog representatives: file counts do not set style frequency.
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self.catalog={}
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for meter,items in library.snippets.items():
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representatives={}
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for item in items:
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for bar in item.bars:
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pattern=tuple((e.onset,e.onset+e.duration) for e in bar.events if e.sounding)
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if any(e.continuation for e in bar.events) or not pattern or not groups.valid(pattern):continue
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if any(b-a<F(1,2) for a,b in pattern):continue
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descriptor=(len(pattern),pattern[0][0]>0,any(a[1]<b[0] for a,b in zip(pattern,pattern[1:])),len(set(b-a for a,b in pattern)))
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representatives.setdefault(descriptor,(item.id,pattern,bar.length,('develop','answer')))
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self.catalog[meter]=tuple(representatives.values())
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self.cache={}
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def realize(self,start,end,purpose,seed,meter):
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key=(start,end,purpose,seed,meter)
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if key in self.cache:return self.cache[key]
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cursor=start;notes=[];sources=[];chosen=[];home=None;uses=0
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while cursor<end:
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available=[g for g in self.groups if purpose in g[3] and g[2]<=end-cursor]
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# Catalog is a separate family, not thousands of duplicate votes.
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if purpose in ('develop','answer'):
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available += sorted((g for g in self.catalog.get(meter,()) if g[2]<=end-cursor),key=lambda g:policy.stable_rank(seed,('catalog',cursor,g[0])))[:1]
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available=[g for g in available if ((end-cursor-g[2])*2).denominator==1]
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if not available:return (),(),()
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# Prefer complete multi-event groups; single values finish an exact remainder.
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large=[g for g in available if g[2]>=1]
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if home is not None and uses<2 and home in available:
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selected=home
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else:
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# Establish one rhythmic idea before reshaping it. A complete phrase
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# is not a fresh unrelated catalog draw at every short boundary.
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selected=min(large or available,key=lambda g:policy.stable_rank(seed,('rhythm',len(chosen)//4,g[0])))
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home=selected;uses=0
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uses+=1
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name,pattern,length,_=selected
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events=tuple((cursor+a,cursor+b) for a,b in pattern)
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notes.extend(events);sources.append(name)
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chosen.extend(groups.describe(pattern,origin=cursor,source=name))
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cursor+=length
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result=(tuple(notes),tuple(chosen),tuple(sources));self.cache[key]=result
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return result
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