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    Class Barrel

    The Barrel Filter Controller.

    This filter controller manages the barrel distortion effect for a Camera. A barrel effect allows you to apply either a 'pinch' or 'expand' distortion to the view. The amount of the effect can be modified in real-time.

    A Barrel effect is added to a Camera via the FilterList component:

    const camera = this.cameras.main;

    camera.filters.internal.addBarrel();
    camera.filters.external.addBarrel();

    Hierarchy (View Summary)

    Index
    constructor
    active allowBaseDraw amount camera currentPadding ignoreDestroy paddingOverride renderNode
    destroy getPadding getPaddingCeil setActive setPaddingOverride

    • Parameters

      • camera: Camera

        The camera that owns this filter.

      • Optionalamount: number

        The amount of distortion applied to the barrel effect. A value of 1 is no distortion. Typically keep this within +- 1. Default 1.

      Returns Barrel

    active: boolean

    Toggle this boolean to enable or disable this filter, without removing it from and re-adding it to the Camera's filter list.

    allowBaseDraw: boolean

    If true, this filter will be permitted to draw to the base texture. This can be unwanted if, for example, the filter doesn't actually draw anything.

    This is an internal flag used by the renderer. You should not modify this value directly.

    amount: number

    The amount of distortion applied to the barrel effect.

    A value of 1 applies no distortion. Values above 1 expand the view outward (barrel distortion), while values below 1 pinch the view inward (pincushion distortion). Typically keep this within ±1 of the default value of 1.

    camera: Camera

    A reference to the Camera that owns this filter.

    currentPadding: Rectangle

    The padding currently being used by this filter. This is read during rendering via getPadding, and may be updated by subclass implementations. It is necessary for filters being used in an external list. You should not modify this value directly.

    ignoreDestroy: boolean

    Whether this filter controller will be destroyed when the FilterList that owns it is destroyed. If you enable this, you must ensure that you clean up the filter controller at an appropriate time. This allows you to reuse a controller for multiple objects; this is not recommended unless you know what you're doing. It tends to work best with external filters.

    paddingOverride: Rectangle

    Padding override. This is on by default. If this is set, the filter will use this padding instead of calculating it. Prefer using setPaddingOverride instead of modifying this directly.

    renderNode: string

    The ID of the RenderNode that this filter uses.

    • Destroys this Controller and nulls any references it holds.

      Returns void

    • Returns the raw padding required for this filter. This is typically not what you want to call; use getPaddingCeil instead. Values from this method are not rounded, which can cause quality loss.

      Override this method when creating a Filter that requires extra room, e.g. a blur or glow effect.undefined

      Returns Rectangle

      The padding required by this filter.

    • Returns the rounded padding required for this filter.

      Most filters don't need extra padding, but some may sample beyond the texture boundaries, such as a blur or glow effect.

      The bounds are encoded as a Rectangle. To enlarge the bounds, the top and left values should be negative, and the bottom and right values should be positive.

      This method calls getPadding() to get the raw padding values, and uses Math.ceil() to set the values of paddingOverride and currentPadding.undefined

      Returns Rectangle

      The rounded padding required by this filter.

    • Sets the active state of this filter.

      A disabled filter will not be used.

      Parameters

      • value: boolean

        true to enable this filter, or false to disable it.

      Returns this

      This filter instance.

    • Sets the padding override. If this is set, the filter will use this padding instead of calculating it. Call setPaddingOverride(null) to clear the override. Call setPaddingOverride() to set the padding to 0.

      Parameters

      • Optionalleft: number | null

        The left padding. Default 0.

      • Optionaltop: number

        The top padding. Default 0.

      • Optionalright: number

        The right padding. Default 0.

      • Optionalbottom: number

        The bottom padding. Default 0.

      Returns void

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