/
piano_roll.js
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/
piano_roll.js
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const noteData = require("./note_data.js");
class PianoRoll {
static width = 940;
static keyHeight = 15;
static noteRulerWidth = 60;
static transportPadding = 15;
static minNoteSize = 15;
constructor(svgSelectors, midiSequence, d3) {
this.d3 = d3;
this.pianoRollSvg = this.d3.select(svgSelectors[0]);
this.noteRulerSvg = this.d3.select(svgSelectors[1]);
this.midiSequence = midiSequence;
const sortedMidiNotes = this.midiSequence.slice(0).sort().filter(n => n !== null);
this.extent = [sortedMidiNotes[0], sortedMidiNotes[sortedMidiNotes.length - 1]];
this.activeNotes = [...Array(this.extent[1] + 1 - this.extent[0]).keys()]
.map(midiNote => noteData[midiNote + this.extent[0]])
.reverse();
this.stepWidth = PianoRoll.width / this.midiSequence.length;
this.stepWidth = PianoRoll.minNoteSize > this.stepWidth ? PianoRoll.minNoteSize : this.stepWidth;
this.pianoRollWidth = this.stepWidth * this.midiSequence.length;
// Note that the domain reverses the extent values because when the piano roll render()s the note range
// is reversed so that the lowest notes display on the bottom.
this.xScale = this.d3.scaleLinear().domain([0, this.midiSequence.length]).range([0, this.pianoRollWidth]);
this.yScale = this.d3.scaleLinear()
.domain([this.extent[1] + 1, this.extent[0]])
.range([0, PianoRoll.keyHeight * this.activeNotes.length]);
}
get sequence() {
return this._sequence;
}
set sequence(sequence) {
this._sequence = sequence;
}
setNotes(playNote) {
this.keys.selectAll(".sequence-note")
.data(this.midiSequence.reduce((nonRests, note, i) => {
if (note != null) nonRests.push({step: i, note: note});
return nonRests;
}, []))
.enter()
.append("rect")
.attr("class", "sequence-note")
.attr("width", this.stepWidth)
.attr("height", PianoRoll.keyHeight)
.attr("x", n => this.xScale(n.step))
.attr("y", n => this.yScale(n.note) - PianoRoll.keyHeight)
.attr("fill", "#09c")
.on("click", (event, n) => playNote(n.note));
}
render() {
let stepWidth = PianoRoll.width / this.midiSequence.length;
stepWidth = PianoRoll.minNoteSize > stepWidth ? PianoRoll.minNoteSize : stepWidth;
this.pianoRollSvg.select("svg .piano-roll").remove();
this.noteRulerSvg.select("svg .note-ruler").remove();
this.noteRulerSvg.attr("height", PianoRoll.keyHeight * this.activeNotes.length + PianoRoll.transportPadding);
this.noteRulerSvg.attr("width", PianoRoll.noteRulerWidth);
this.pianoRollSvg.attr("height", PianoRoll.keyHeight * this.activeNotes.length + PianoRoll.transportPadding);
this.pianoRollSvg.attr("width", stepWidth * this.midiSequence.length);
this.noteRuler = this.noteRulerSvg.append("g")
.attr("transform", `translate(0, ${PianoRoll.transportPadding})`)
.attr("class", "note-ruler")
.attr("width", PianoRoll.noteRulerWidth)
.attr("height", PianoRoll.keyHeight * this.activeNotes.length);
this.noteRuler.selectAll(".note-label")
.data(this.activeNotes)
.enter()
.append("text")
.text(n => n.note)
.attr("fill", "black")
.attr("font-size", 12)
.attr("x", PianoRoll.noteRulerWidth / 2)
.attr("y", (n, i) => i * PianoRoll.keyHeight + PianoRoll.keyHeight - (PianoRoll.keyHeight / 3));
let cNotes = this.activeNotes.reduce((matches, note, i) => {
if (note.note == "C") matches.push({octave: note.octave, index: i});
return matches;
}, []);
this.noteRuler.selectAll(".octave-label")
.data(cNotes)
.enter()
.append("text")
.text(n => n.octave)
.attr("fill", "black")
.attr("font-size", 12)
.attr("x", 10)
.attr("y", (n) => n.index * PianoRoll.keyHeight + PianoRoll.keyHeight - (PianoRoll.keyHeight / 3));
this.noteRuler.selectAll(".octave-division")
.data(cNotes)
.enter()
.append("line")
.attr("class", "octave-division")
.attr("x1", 0)
.attr("y1", (n) => n.index * PianoRoll.keyHeight + PianoRoll.keyHeight)
.attr("x2", PianoRoll.noteRulerWidth)
.attr("y2", (n) => n.index * PianoRoll.keyHeight + PianoRoll.keyHeight)
.attr("stroke", "#333");
this.pianoRoll = this.pianoRollSvg.append("g")
.attr("class", "piano-roll");
this.transport = this.pianoRoll.append("g")
.attr("class", "transport")
.attr("width", this.pianoRollWidth)
.attr("height", PianoRoll.transportPadding);
this.transport.selectAll(".step")
.data([...Array(this.midiSequence.length).keys()])
.enter()
.append("rect")
.attr("class", step => `step step-${step}`)
.attr("width", stepWidth)
.attr("height", PianoRoll.transportPadding)
.attr("x", step => this.xScale(step))
.attr("y", 0)
.attr("fill", "#999")
.attr("stroke", "#bbb");
this.keys = this.pianoRoll.append("g")
.attr("transform", `translate(0, ${PianoRoll.transportPadding})`)
.attr("class", "keys")
.attr("width", this.pianoRollWidth)
.attr("height", PianoRoll.keyHeight * this.activeNotes.length)
.attr("stroke", "#aaa");
this.keys.selectAll(".key")
.data(this.activeNotes)
.enter()
.append("rect")
.attr("class", "key")
.attr("width", this.pianoRollWidth)
.attr("height", PianoRoll.keyHeight)
.attr("x", 0)
.attr("y", (n, i) => i * PianoRoll.keyHeight)
.attr("fill", n => n.note.charAt(n.note.length - 1) == "#" ? "#ccc" : "#fff");
this.keys.selectAll(".step-division")
.data(new Array(this.midiSequence.length).fill(0))
.enter()
.append("line")
.attr("class", "step-division")
.attr("x1", (s, i) => this.xScale(i))
.attr("y1", 0)
.attr("x2", (s, i) => this.xScale(i))
.attr("y2", this.activeNotes.length * PianoRoll.keyHeight)
.attr("stroke", (s, i) => i % 4 == 0 ? "#333" : "#aaa");
}
}
const unique = (value, index, self) => self.indexOf(value) === index;
module.exports = PianoRoll;