EqBand

EqBand

new EqBand(optionsopt)

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Properties:
Name Type Attributes Default Description
options.type String | function <optional>
 "parametric"

The type of the filter. Possible values are parametric, notch, low-shelf, high-shelf, lowpass[n] or highpass[n].
options.freq Number

Frequency setting. This is an alias for the option x defined by ChartHandle.
options.gain Number

Gain setting. This is an alias for the option y defined by ChartHandle.
options.q Number

Quality setting. This is an alias for the option z defined by ChartHandle.
options.active Boolean <optional>
 true

Set to false to not take this filter into account when drawing the response graph.

An EqBand extends a ChartHandle and holds a dependent Filter. It is used as a fully functional representation of a single equalizer band in Equalizer EqBand needs a Chart or any other derivate to be drawn in.

Parameters:
Name Type Attributes Default Description
options Object <optional>
 { }

An object containing initial options.

Extends

Members

_handle :SVGCircular

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The main handle. Has class .aux-handle.

Type:
  • SVGCircular

_label :SVGText

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The label. Has class .aux-label.

Type:
  • SVGText

_line1 :SVGPath

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The first line. Has class .aux-line .aux-line1.

Type:
  • SVGPath

_line2 :SVGPath

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The second line. Has class .aux-line .aux-line2.

Type:
  • SVGPath

_zhandle :SVGCircular

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The handle for manipulating z axis. Has class .aux-zhandle.

Type:
  • SVGCircular

element :HTMLDivElement

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The main SVG group. Has class .aux-eqband.

Type:
  • HTMLDivElement

filter :Filter

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The filter providing the graphical calculations.

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range_x :Range

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The Range for the x axis.

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range_y :Range

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The Range for the y axis.

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range_z :Range

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The Range for the z axis.

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Methods

addChild(child)

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Registers a widget as a child widget. This method is used to build up the widget tree. It does not modify the DOM tree.

Parameters:
Name Type Description
child Widget

The child to add.
Fires:
  • Widget#event:child_added

addChildren(a)

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Registers an array of widgets as children.

Parameters:
Name Type Description
a Array.<Widget>

An array of Widgets.

allChildren()

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Returns an array of all children.

appendChild(child)

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Appends child.element to the widget element and registers child as a child widget.

Parameters:
Name Type Description
child Widget

The child widget to append.

appendChildren(children)

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Calls Widget#appendChild for an array of widgets.

Parameters:
Name Type Description
children Array.<Widget>

The child widgets to append.

disableTansitions()

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Disable CSS transitions.

enableDraw()

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Schedules this widget for drawing.

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enableDrawChildren()

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Enables rendering for all children of this widget.

enableTransitions()

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Enable CSS transitions.

forceHide()

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Hide the widget immediately by applying the class aux-hide. Does not call disableDraw().

forceShow()

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Show the widget immediately by applying the class aux-show. Does not call enableDraw().

frequencyToGain(freq) → {number}

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Calculate the gain for a given frequency in Hz.

Parameters:
Name Type Description
freq number

The frequency.
Returns:

The gain at the given frequency.

Type
number

getStyle()

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Returns the computed style of this widget's DOM element.

hidden()

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Returns the current hidden status.

hide()

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Hide the widget. This will result in the class aux-hide being applied to this widget in the next rendering step.

invalidate(key)

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Invalidates an option and triggers a redraw() call.

Parameters:
Name Type Description
key string

observeResize(cb)

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Calls a callback whenever the widget resizes. This method will trigger one resize.

Parameters:
Name Type Description
cb function

removeChild(child)

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Removes a child widget. Note that this method only modifies the widget tree and does not change the DOM.

Parameters:
Name Type Description
child Widget

The child to remove.
Fires:
  • Widget#event:child_removed

removeChildren(a)

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Removes an array of children.

Parameters:
Name Type Description
a Array.<Widget>

An array of Widgets.

set(key, value)

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Sets an option.

Parameters:
Name Type Description
key string

The option name.
value

The option value.

setStyle()

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Sets a CSS style property in this widget's DOM element.

show()

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Make the widget visible. This will apply the class aux-show during the next rendering step.

toFront()

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Moves the handle to the front, i.e. add as last element to the containing SVG group element.

toggleHidden()

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Toggle the hidden status. This is equivalent to calling hide() or show(), depending on the current hidden status of this widget.

transitionsDisabled()

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Returns true if transitions are currently disabled on this widget.

visibleChildren()

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Returns an array of all visible children.

Events

destroy

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Is fired when a widget is destroyed.

doubleclick

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Is fired after a double click appeared. Set dblclick to 0 to disable click event handling.

Parameters:
Name Type Description
event string

The browsers MouseEvent.

GenericDOMEvents

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Generic DOM events. Please refer to W3Schools for further details.

handlegrabbed

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Is fired when the main handle is grabbed by the user. The argument is an object with the following members:

  • x: the actual value on the x axis
  • y: the actual value on the y axis
  • pos_x: the position in pixels on the x axis
  • pos_y: the position in pixels on the y axis
Parameters:
Name Type Description
positions Object

An object containing all relevant positions of the pointer.

handlereleased

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Is fired when the user releases the main handle. The argument is an object with the following members:

  • x: the actual value on the x axis
  • y: the actual value on the y axis
  • pos_x: the position in pixels on the x axis
  • pos_y: the position in pixels on the y axis
Parameters:
Name Type Description
positions Object

An object containing all relevant positions of the pointer.

hide

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The hide event is emitted when a widget is hidden and is not rendered anymore. This happens both with browser visibility changes and also internally when using layout widgets such as Pager.

initialized

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Is fired when a widget is initialized.

redraw

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The redraw event is emitted when a widget is redrawn. This can be used to do additional DOM modifications to a Widget.

resize

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The resize event is emitted whenever a widget is being resized. This event can be used to e.g. measure its new size. Note that some widgets do internal adjustments after the resize event. If that is relevant, the Widget#resized event can be used instead.

resized

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The resized event is emitted after each rendering frame, which was triggered by a resize event.

set

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The set event is emitted when an option was set using the Widget#set method. The arguments are the option name and its new value.

Note that this happens both for user interaction and programmatical option changes.

show

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The show event is emitted when a widget is shown and is being rendered. This is the counterpart to Widget#hide.

useraction

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The useraction event is emitted when a widget gets modified by user interaction. The event is emitted for the options x, y and z.

Parameters:
Name Type Description
name string

The name of the option which was changed due to the users action.
value mixed

The new value of the option.

visibility

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Is fired when the visibility state changes. The first argument is the visibility state, which is either true or false.

zchangeended

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Is fired when the user releases the z-handle. The argument is the actual z value.

Parameters:
Name Type Description
z number

The z value.

zchangestarted

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Is fired when the user grabs the z-handle. The argument is the actual z value.

Parameters:
Name Type Description
z number

The z value.