Patroneo/engine/track.py

#! /usr/bin/env python3
# -*- coding: utf-8 -*-
"""
Copyright 2021, Nils Hilbricht, Germany ( https://www.hilbricht.net )

This file is part of the Laborejo Software Suite ( https://www.laborejo.org ),

This application 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 3 of the License, or
(at your option) any later version.

This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
"""

import logging; logger = logging.getLogger(__name__); logger.info("import")

#Standard Library Modules
from typing import List, Set, Dict, Tuple

#Third Party Modules

#Template Modules
import template.engine.sequencer

#Our modules
from .pattern import Pattern

class Track(object): #injection at the bottom of this file!
    """The pattern is same as the track, even if the GUI does not represent it that way

    Init parameters are for cloned and copied tracks, but not for loading from json.
    """

    def __init__(self, parentData,
            name:str="",
            structure:Set[int]=None,
            scale:Tuple[int]=None,
            color:str=None,
            whichPatternsAreScaleTransposed:Dict[int,int]=None,
            whichPatternsAreHalftoneTransposed:Dict[int,int]=None,
            simpleNoteNames:List[str]=None):

        self.parentData = parentData
        self.sequencerInterface = template.engine.sequencer.SequencerInterface(parentTrack=self, name=name) #needs parentData
        self.color = color if color else "#00FFFF" # "#rrggbb" in hex. no alpha.  a convenience slot for the GUI to save a color.

        #2.0
        #The distinction between Track and Pattern in our code is artificial, it is the same thing,
        #we take inspiration from the GUI that presents the Track on its own.
        #The following setting is most likely to be found in the track sub-window:
        self.patternLengthMultiplicator = 1 #int. >= 1   the multiplicator is added after all other calculations, like subdivions.  We can't integrate this into howManyUnits because that is the global score value
        self.midiChannel = 0 # 0-15 midi channel is always set.

        #2.1
        self.group = "" # "" is a standalone track, the normal one which existed since version 1.0.  Using a name here will group these tracks together. A GUI can use this information. Also all tracks in a group share a single jack out port.
        self.visible = True #only used together with groups. the api and our Datas setGroup function take care that standalone tracks are never hidden.

        self.pattern = Pattern(parentTrack=self, scale=scale, simpleNoteNames=simpleNoteNames)
        self.structure = structure if structure else set() #see buildTrack(). This is the main track data structure besides the pattern. Just integers (starts at 0) as switches which are positions where to play the patterns. In between are automatic rests.
        self.whichPatternsAreScaleTransposed = whichPatternsAreScaleTransposed if whichPatternsAreScaleTransposed else {} #position:integers between -7 and 7. Reversed pitch, row based: -7 is higher than 7!!
        self.whichPatternsAreHalftoneTransposed = whichPatternsAreHalftoneTransposed if whichPatternsAreHalftoneTransposed else {} #position:integers between -7 and 7. Reversed pitch, row based: -7 is higher than 7!!
        self._processAfterInit()

    def _processAfterInit(self):
        pass

    def buildTrack(self):
        """The goal is to create a cbox-track, consisting of cbox-clips which hold cbox-pattern,
        generated with our own note data. The latter happens in structures_pattern.

        This is called after every small change.
        """
        if self.group:
            #We still have an inactive sequencerinterface but instead we use the group ones as subtrack.
            ourCalfboxTrack = self.parentData.groups[self.group]._subtracks[id(self)].calfboxSubTrack
        else:
            ourCalfboxTrack = self.sequencerInterface.calfboxTrack

        assert ourCalfboxTrack, (self, self.group, self.parentData, self.sequencerInterface)

        #First clean the transpositions of zeroes
        self.whichPatternsAreScaleTransposed = {k:v for k,v in self.whichPatternsAreScaleTransposed.items() if v!=0 and k in self.structure}
        self.whichPatternsAreHalftoneTransposed = {k:v for k,v in self.whichPatternsAreHalftoneTransposed.items() if v!=0 and k in self.structure}

        oneMeasureInTicks = (self.parentData.howManyUnits * self.parentData.whatTypeOfUnit) / self.parentData.subdivisions  #subdivisions is 1 by default. bigger values mean shorter values, which is compensated by the user setting bigger howManyUnits manually.
        oneMeasureInTicks = int(oneMeasureInTicks) * self.patternLengthMultiplicator

        filteredStructure = [index for index in sorted(self.structure) if index < self.parentData.numberOfMeasures] #not <= because we compare count with range
        cboxclips = [o.clip for o in ourCalfboxTrack.status().clips]

        globalOffset = self.parentData.cachedOffsetInTicks

        for cboxclip in cboxclips:
            cboxclip.delete() #removes itself from the track
        for index in filteredStructure:
            scaleTransposition = self.whichPatternsAreScaleTransposed[index] if index in self.whichPatternsAreScaleTransposed else 0
            halftoneTransposition = self.whichPatternsAreHalftoneTransposed[index] if index in self.whichPatternsAreHalftoneTransposed else 0
            cboxPattern = self.pattern.buildPattern(scaleTransposition, halftoneTransposition, self.parentData.howManyUnits, self.parentData.whatTypeOfUnit, self.parentData.subdivisions, self.patternLengthMultiplicator)
            r = ourCalfboxTrack.add_clip(globalOffset + index*oneMeasureInTicks, 0, oneMeasureInTicks, cboxPattern) #pos, pattern-internal offset, length, pattern.

        ######Old optimisations. Keep for later####
        ##########################################
        #if changeClipsInPlace: #no need for track.buildTrack. Very cheap pattern exchange.
        #    cboxclips = [o.clip for o in self.parentTrack.sequencerInterface.calfboxTrack.status().clips]
        #    for cboxclip in cboxclips:
        #        cboxclip.set_pattern(self.cboxPattern[cboxclip.patroneoScaleTransposed])


    #Save / Load / Export

    def serialize(self)->dict:
        return {
            "sequencerInterface" : self.sequencerInterface.serialize(),
            "color" : self.color,
            "structure" : list(self.structure),
            "pattern" : self.pattern.serialize(),
            "whichPatternsAreScaleTransposed" : self.whichPatternsAreScaleTransposed,
            "whichPatternsAreHalftoneTransposed" : self.whichPatternsAreHalftoneTransposed,
            "patternLengthMultiplicator" : self.patternLengthMultiplicator,
            "midiChannel" : self.midiChannel,
            "group" : self.group,
            "visible" : self.visible,
        }

    @classmethod
    def instanceFromSerializedData(cls, parentData, serializedData):
        self = cls.__new__(cls)
        self.parentData = parentData
        self.sequencerInterface = template.engine.sequencer.SequencerInterface.instanceFromSerializedData(self, serializedData["sequencerInterface"])

        #Version 2.0+ changes
        if "patternLengthMultiplicator" in serializedData:
            self.patternLengthMultiplicator = serializedData["patternLengthMultiplicator"]
        else:
            self.patternLengthMultiplicator = 1

        if "midiChannel" in serializedData:
            self.midiChannel = serializedData["midiChannel"]
        else:
            self.midiChannel = 0

        if "group" in serializedData:
            self.group = serializedData["group"]
        else:
            self.group = "" #standalone track

        if "visible" in serializedData:
            self.visible = serializedData["visible"]
        else:
            self.visible = True

        self.color = serializedData["color"]
        self.structure = set(serializedData["structure"])
        self.whichPatternsAreHalftoneTransposed = {int(k):int(v)  for k,v in serializedData["whichPatternsAreHalftoneTransposed"].items()} #json saves dict keys as strings
        self.whichPatternsAreScaleTransposed = {int(k):int(v)  for k,v in serializedData["whichPatternsAreScaleTransposed"].items()} #json saves dict keys as strings
        self.pattern = Pattern.instanceFromSerializedData(parentTrack=self, serializedData=serializedData["pattern"] )
        self._processAfterInit()
        return self

    def export(self)->dict:
        return {
            "id" : id(self),
            "sequencerInterface" : self.sequencerInterface.export(),
            "color" : self.color,
            "structure" : sorted(self.structure),
            "patternBaseLength" : self.parentData.howManyUnits, #for convenient access
            "patternLengthMultiplicator" : self.patternLengthMultiplicator, #int
            "pattern": self.pattern.exportCache,
            "scale": self.pattern.scale,
            "numberOfSteps": self.pattern.numberOfSteps, #pitches. Convenience for len(scale)
            "simpleNoteNames": self.pattern.simpleNoteNames,
            "numberOfMeasures": self.parentData.numberOfMeasures,
            "whichPatternsAreScaleTransposed": self.whichPatternsAreScaleTransposed,
            "whichPatternsAreHalftoneTransposed": self.whichPatternsAreHalftoneTransposed,
            "midiChannel" : self.midiChannel+1, #1-16
            "group" : self.group, #string
            "visible" : self.visible, #bool. Always True for standalone tracks
        }

#Dependency Injections.
template.engine.sequencer.Score.TrackClass = Track #Score will look for Track in its module.