React Piano Roll

A React fork of mjhasbach/pixi-piano-roll.

Note: this is not an audio sequencer in itself – it's just the graphical part.

Usage

yarn add react-piano-roll

import PianoRoll from "react-piano-roll";

<PianoRoll
  width={1200}
  height={660}
  zoom={6}
  resolution={2}
  gridLineColor={0x333333}
  blackGridBgColor={0x1e1e1e}
  whiteGridBgColor={0x282828}
  noteData={[
    ["0:0:0", "F5", ""],
    ["0:0:0", "C4", "2n"],
    ["0:0:0", "D4", "2n"],
    ["0:0:0", "E4", "2n"],
    ["0:2:0", "B4", "4n"],
    ["0:3:0", "A#4", "4n"],
    ["0:0:0", "F2", ""],
  ]}
/>;

Playback API

The transport controls are passed down through a ref:

import React, { useRef } from "react";
import PianoRoll from "./dist/PianoRoll";

function App() {
  const playbackRef = useRef();

  window.addEventListener("keydown", ({ key }) => {
    if (key === " ") {
      playbackRef.current.toggle();
    } else if (key === "Enter") {
      playbackRef.current.seek("0:0:0");
    }
  });

  return <PianoRoll ref={playbackRef} />;
}

👇 pixi-piano-roll Docs: 👇

Typedefs

pixiPianoRoll

JavaScript 2D WebGL / Canvas animated piano roll

Author: Matthew Hasbach
License: MIT
Copyright: Matthew Hasbach 2015

pixiPianoRoll(opt) ⇒ pianoRollAPI ⏏

Instantiate a pixiPianoRoll

Kind: Exported function

| Param | Type | Default | Description | | ------------------- | ------------------------------------------------------------- | ----------------------------------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | opt | Object | | Options object | | [opt.width] | number | 900 | Width of the piano roll | | [opt.height] | number | 400 | Height of the piano roll | | [opt.pianoKeyWidth] | number | 125 | Width of the piano keys | | [opt.noteColor] | number | Object.<number> | musicalScaleColors.dDJameson | Hexadecimal color of every note or object that has pitch class (chroma) property names and hexadecimal color values. See musical-scale-colors for palettes (including the default). | | [opt.noteColor] | number | 0x333333 | Hexadecimal color of the grid lines | | [opt.noteColor] | number | 0 | Hexadecimal color of the background | | [opt.bpm] | number | 140 | Beats per minute | | [opt.activateKeys] | boolean | true | If true, the color of the piano keys will change to the color of the notes that intersect them | | [opt.antialias] | boolean | true | Whether or not the renderer will use antialiasing | | [opt.zoom] | number | 4 | Amount of visible measures | | [opt.resolution] | number | 1 | Amount of vertical grid lines per measure | | [opt.time] | transportTime | 0:0:0 | The transportTime at which playback will begin | | [opt.renderer] | string | "WebGLRenderer" | Determines the renderer type. Must be "WebGLRenderer" or "CanvasRenderer". | | [opt.noteFormat] | string | "String" | The format of the notes in opt.noteData. "String" for scientific or Helmholtz notation, "Key" for piano key numbers, "Frequency" for audio frequencies, or "MIDI" for MIDI note numbers. | | [opt.noteData] | noteData | [] | Note data |

Example

var pianoRoll = pixiPianoRoll({
  width: 900,
  height: 400,
  noteColor: 0xdb000f,
  gridLineColor: 0x333333,
  backgroundColor: 0x1a0002,
  bpm: 140,
  antialias: true,
  zoom: 4,
  resolution: 2,
  time: "0:0:0",
  renderer: "WebGLRenderer",
  noteFormat: "String",
  noteData: [
    ["0:0:0", "C4", "2n"],
    ["0:0:0", "D4", "2n"],
    ["0:0:0", "E4", "2n"],
    ["0:2:0", "B4", "4n"],
    ["0:3:0", "A#4", "4n"],
  ],
});

document.getElementsByTagName("body")[0].appendChild(pianoRoll.view);

pianoRoll.playback.play();

transportTime : string

Playback position expressed in bars:quarters:sixteenths format (e.g. "1:2:0")

Kind: global typedef

note : string | number

Musical note expressed in Scientific notation, Helmholtz notation, piano key number, audio frequency (the closest note will be used), or MIDI note number

Kind: global typedef

noteDuration : string | number

Note duration expressed as a number (e.g. 1 for a whole note) or string (e.g. "4n" for a quarter note)

Kind: global typedef

noteData : Array.<Array.<transportTime, note, noteDuration>>

See the typedefs for transportTime, note, and noteDuration

Kind: global typedef

pianoRollAPI : Object

The piano roll API

Kind: global typedef

• pianoRollAPI : Object
  • .playback : Object
    • .toggle([time])
    • .play([time])
    • .pause()
    • .seek(time)
  • .bpm : number
  • .zoom : number
  • .resolution : number
  • .noteData : noteData
  • .playing : boolean
  • .view : HTMLElement

pianoRollAPI.playback : Object

Contains methods that control playback

Kind: static property of pianoRollAPI

• .playback : Object
  • .toggle([time])
  • .play([time])
  • .pause()
  • .seek(time)

playback.toggle([time])

Pause if playing or play if paused

Kind: static method of playback

| Param | Type | Description | | ------ | -------------------------------------------- | -------------------------------------------------------------------------------------------------- | | [time] | transportTime | If paused, the position to begin playing. If omitted, playback will begin at the current position. |

playback.play([time])

Begin playback

Kind: static method of playback

| Param | Type | Description | | ------ | -------------------------------------------- | --------------------------------------------------------------------------------------- | | [time] | transportTime | The position to begin playing. If omitted, playback will begin at the current position. |

playback.pause()

Pause playback

Kind: static method of playback

playback.seek(time)

Change the playback position

Kind: static method of playback

| Param | Type | Description | | ----- | -------------------------------------------- | ------------------------- | | time | transportTime | The new playback position |

pianoRollAPI.bpm : number

Change the bpm by changing this property

Kind: static property of pianoRollAPI

pianoRollAPI.zoom : number

Change the zoom by changing this property

Kind: static property of pianoRollAPI

pianoRollAPI.resolution : number

Change the resolution by changing this property

Kind: static property of pianoRollAPI

pianoRollAPI.noteData : noteData

Change the note data by changing this property

Kind: static property of pianoRollAPI

pianoRollAPI.playing : boolean

Whether or not playback is ongoing

Kind: static property of pianoRollAPI
Read only: true

pianoRollAPI.view : HTMLElement

The piano roll canvas element

Kind: static property of pianoRollAPI
Read only: true