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plugin/src/main/kotlin/intellij/music/core/CircleOfFifthsSequencer.kt
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plugin/src/main/kotlin/intellij/music/core/IonianScaleSequencer.kt
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,73 @@ | ||
| package intellij.music.core | ||
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| import kotlin.random.Random | ||
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| class IonianScaleSequencer: ScaleSequencer { | ||
| private var currentScale = "C" | ||
| private var notesPlayedInScale = 0 | ||
| private var notesPlayedInOctave = 0 | ||
| private var currentOctave = listOf(MidiNotes.BASE_OCTAVE, MidiNotes.BASE_OCTAVE + 1).random() | ||
| private var previousNoteIndex: Int = 0 | ||
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| override fun nextNote(previousNote: Pair<String, Int>): Pair<String, Int> { | ||
| notesPlayedInOctave += 1 | ||
| notesPlayedInScale += 1 | ||
| tryToChangeScale() | ||
| return shift() | ||
| } | ||
|
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| override fun getChord(): List<Pair<String, Int>> { | ||
| val base = Pair(MidiNotes.scaleNotes[currentScale]!![0], currentOctave) | ||
| val third = Pair(MidiNotes.scaleNotes[currentScale]!![2], currentOctave) | ||
| val fifth = Pair(MidiNotes.scaleNotes[currentScale]!![5], currentOctave) | ||
| return listOf(base, third, fifth) | ||
| } | ||
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| private fun shift(): Pair<String, Int> { | ||
| previousNoteIndex = if (modeShifts[previousNoteIndex].isNotEmpty()) { | ||
| modeShifts[previousNoteIndex].random() | ||
| } | ||
| else { | ||
| listOf(0, 4, 5, 7).random() | ||
| } | ||
| val scale = MidiNotes.scaleNotes[currentScale] ?: error("Failed to get scale!") | ||
| if (Random.nextBoolean()) { | ||
| if (previousNoteIndex == 0 || previousNoteIndex == 7) { | ||
| val octaveShift = MidiNotes.octaveShift(notesPlayedInOctave, currentOctave) | ||
| if(octaveShift != 0) { | ||
| notesPlayedInOctave = 0 | ||
| currentOctave += octaveShift | ||
| } | ||
| } | ||
| } | ||
| return Pair(scale[previousNoteIndex], currentOctave) | ||
| } | ||
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| private fun tryToChangeScale() { | ||
| val otherScale = if (currentScale == "F") { | ||
| "F" | ||
| } | ||
| else { | ||
| "C" | ||
| } | ||
| val pr = notesPlayedInScale * 0.005 | ||
| if (Random.nextFloat() < pr) { | ||
| currentScale = otherScale | ||
| notesPlayedInScale = 0 | ||
| } | ||
| } | ||
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| companion object { | ||
| val modeShifts: List<List<Int>> = listOf( | ||
| listOf(1, 2, 3, 4, 5, 6, 7), | ||
| listOf(), | ||
| listOf(), | ||
| listOf(1), | ||
| listOf(4, 7), | ||
| listOf(), | ||
| listOf(5, 1), | ||
| listOf(1, 2, 3, 4, 5, 6, 7) | ||
| ) | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,51 @@ | ||
| package intellij.music.core | ||
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| import kotlin.math.abs | ||
| import kotlin.random.Random | ||
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| object MidiNotes { | ||
| fun noteToMidi(note: Pair<String, Int>): Int { | ||
| val index = notes.indexOf(note.first) | ||
| return index + note.second * notes.size | ||
| } | ||
|
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| fun octaveShift(notesPlayed: Int, currentOctave: Int): Int { | ||
| fun sign(x: Double): Int { | ||
| return if (x < 0) { | ||
| -1 | ||
| } else { | ||
| +1 | ||
| } | ||
| } | ||
| var pr = notesPlayed * 0.1 | ||
| var shift = 0 | ||
| if (Random.nextFloat() < pr) { | ||
| pr = abs(3.0 - currentOctave) / 7.0 | ||
| pr *= 2.0 | ||
| shift = selectRandom(listOf(-1, +1), listOf(pr, 1.0 - pr)) * sign(pr) | ||
| } | ||
| if(shift + currentOctave < 1) { | ||
| shift = 0 | ||
| } | ||
| else if(shift + currentOctave > 7) { | ||
| shift = 0 | ||
| } | ||
| return shift | ||
| } | ||
|
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| val BASE_OCTAVE: Int = 3 | ||
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| val notes = listOf("C", "Db", "D", "Eb", "E", "F", "Gb", "G", "Ab", "A", "Bb", "B") | ||
| get() = field | ||
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| val scaleNotes: Map<String, List<String>> = mapOf( | ||
| "C" to listOf("C", "D", "E", "F", "G", "A", "B", "C"), | ||
| "D" to listOf("D", "E", "Gb", "G", "A", "B", "Db", "D"), | ||
| "E" to listOf("E", "Gb", "Ab", "A", "B", "Db", "Eb", "E"), | ||
| "F" to listOf("F", "G", "A", "Bb", "C", "D", "E", "F"), | ||
| "G" to listOf("G", "A", "B", "C", "D", "E", "Gb", "G"), | ||
| "A" to listOf("A", "B", "Db", "D", "E", "Gb", "Ab", "A"), | ||
| "B" to listOf("B", "Db", "Eb", "E", "Gb", "Ab", "Bb", "B") | ||
| ) | ||
| get() = field | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,6 @@ | ||
| package intellij.music.core | ||
|
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| interface ScaleSequencer { | ||
| fun nextNote(previousNote: Pair<String, Int>): Pair<String, Int> | ||
| fun getChord(): List<Pair<String, Int>> | ||
| } |