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    Class Voice

    Voice is mainly a container object to group Tickables for formatting.

    Hierarchy (View Summary)

    Index

    Constructors

    Properties

    _fontInfo: Required<FontInfo>
    _height: number = 0
    _text: string = ''
    _textMetrics: TextMetrics = ...
    _width: number = 0
    children: Element[] = []
    expTicksUsed?: number
    fontScale: number
    largestTickWidth: number = 0
    metricsValid: boolean = false
    mode: VoiceMode = VoiceMode.STRICT
    options: { softmaxFactor: number }
    parent?: Element
    preFormatted: boolean = false
    registry?: Registry
    rendered: boolean
    resolutionMultiplier: number = 1
    smallestTickCount: Fraction
    stave?: Stave
    style: ElementStyle = {}
    tickables: Tickable[] = []
    ticksUsed: Fraction = ...
    time: Required<VoiceTime>
    totalTicks: Fraction
    x: number = 0
    xShift: number = 0
    y: number = 0
    yShift: number = 0
    ID: number = 1000

    Accessors

    • get font(): string

      Returns the CSS compatible font string for the text font.

      Returns string

    • set font(f: string): void

      Provide a CSS compatible font string (e.g., 'bold 16px Arial') that will be applied to text (not glyphs).

      Parameters

      • f: string

      Returns void

    • get fontSize(): string

      Returns string

      a CSS font-size string (e.g., '18pt', '12px', '1em').

    • set fontSize(size: string | number): void

      The size is 1) a string of the form '10pt' or '16px', compatible with the CSS font-size property. or 2) a number, which is interpreted as a point size (i.e. 12 == '12pt').

      Parameters

      • size: string | number

      Returns void

    • get fontSizeInPixels(): number

      Returns number

      the font size in px.

    • get fontSizeInPoints(): number

      Returns number

      the font size in pt.

    • get fontStyle(): string

      Returns string

      a CSS font-style string (e.g., 'italic').

    • set fontStyle(style: string): void

      Set the font style.

      Parameters

      • style: string

      Returns void

    • get fontWeight(): string

      Returns string

      a CSS font-weight string (e.g., 'bold'). As in CSS, font-weight is always returned as a string, even if it was set as a number.

    • set fontWeight(weight: string | number): void

      Set the font weight.

      Parameters

      • weight: string | number

      Returns void

    • get Mode(): typeof VoiceMode

      Modes allow the addition of ticks in three different ways:

      • STRICT: This is the default. Ticks must fill the voice.
      • SOFT: Ticks can be added without restrictions.
      • FULL: Ticks do not need to fill the voice, but can't exceed the maximum tick length.

      Returns typeof VoiceMode

    Methods

    • Adds a child to the Element, which lets it inherit the same style as the parent when setGroupStyle() is called.

      Examples of children are noteheads and stems. Modifiers such as Accidentals are generally not set as children.

      Note that StaveNote calls setGroupStyle() when setStyle() is called.

      Parameters

      Returns this

    • Render the voice onto the canvas context and an optional stave. If stave is omitted, it is expected that the notes have staves already set.

      This method also calculates the voice's boundingBox while drawing the notes. Note the similarities with this.getBoundingBox().

      Parameters

      Returns void

    • Draw the element and all its sub-elements (i.e.: Modifiers in a Stave) with the element's style (see getStyle() and setStyle())

      Returns this

    • Get the actual tick resolution for the voice.

      Returns number

    • Returns string

      a CSS font-size string (e.g., '18pt', '12px', '1em'). See Element.fontSizeInPixels or Element.fontSizeInPoints if you need to get a number for calculation purposes.

    • Get the largest width of all the tickables.

      Returns number

    • Get the voice mode (Voice.Mode.SOFT, STRICT, or FULL)

      Returns number

    • Get the resolution multiplier for the voice.

      Returns number

    • Check if it has a class label (An element can have multiple class labels).

      Parameters

      • className: string

      Returns boolean

    • Determine if the voice is complete according to the voice mode.

      Returns boolean

    • Preformat the voice by applying the voice's stave to each note.

      Returns this

    • Calculate the sum of the exponents of all the ticks in this voice to use as the denominator of softmax. (It is not the sum of the softmax(t) over all tickables)

      Note that the "exp" of "expTicksUsed" stands for "expontential" ticks used, not "expected" ticks used.

      Returns number

    • Set an attribute such as 'id', 'class', or 'type'.

      Parameters

      • name: string
      • value: undefined | string

      Returns this

    • Set the element's text font family, size, weight, style (e.g., Arial, 10pt, bold, italic).

      This attribute does not determine the font used for musical Glyphs like treble clefs.

      Parameters

      • Optionalfont: string | FontInfo

        is 1) a FontInfo object or 2) a string formatted as CSS font shorthand (e.g., 'bold 10pt Arial') or 3) a string representing the font family (at least one of size, weight, or style must also be provided).

      • Optionalsize: string | number

        a string specifying the font size and unit (e.g., '16pt'), or a number (the unit is assumed to be 'pt').

      • Optionalweight: string | number

        is a string (e.g., 'bold', 'normal') or a number (100, 200, ... 900).

      • Optionalstyle: string

        is a string (e.g., 'italic', 'normal'). If no arguments are provided, then the font is set to the default font. Each Element subclass may specify its own default by overriding the static TEXT_FONT property.

      Returns this

    • Change the font size, while keeping everything else the same.

      Parameters

      • Optionalsize: string | number

      Returns this

    • Set the voice mode.

      Parameters

      • mode: number

        value from VoiceMode or Voice.Mode

      Returns this

    • We use softmax to layout the tickables proportional to the exponent of their duration. The softmax factor is used to determine the 'linearness' of the layout.

      The softmax of all the tickables in this voice should sum to 1.

      Parameters

      • factor: number

      Returns this

    • Set the voice mode to strict or soft.

      Parameters

      • strict: boolean

      Returns this

    • Set the element style used to render.

      Example:

      element.setStyle({ fillStyle: 'red', strokeStyle: 'red' });
      element.drawWithStyle();

      Note: If the element draws additional sub-elements (i.e.: Modifiers in a Stave), the style can be applied to all of them by means of the context:

      element.setStyle({ fillStyle: 'red', strokeStyle: 'red' });
      element.getContext().setFillStyle('red');
      element.getContext().setStrokeStyle('red');
      element.drawWithStyle();

      or using drawWithStyle:

      element.setStyle({ fillStyle: 'red', strokeStyle: 'red' });
      element.drawWithStyle();

      Parameters

      Returns this

    • Get the softmax-scaled value of a tick duration. 'tickValue' is a number.

      Parameters

      • tickValue: number

      Returns number

    • Measure the text using the FontInfo related with key.

      Parameters

      • text: string
      • key: string = ''

      Returns number