OpenLIME Class: LayerSvgAnnotation

new LayerSvgAnnotation( [options])

Creates a new LayerSvgAnnotation instance

Parameters:

Name	Type	Argument	Description
`options`	LayerSvgAnnotationOptions	<optional>	Configuration options

Source:

LayerSvgAnnotation.js, line 72

Example

```javascript
// Create SVG annotation layer with custom classes
const annotationLayer = new OpenLIME.Layer({
  type: 'svg_annotations',
  classes: {
    'highlight': { stroke: '#ff0', label: 'Highlight' },
    'comment': { stroke: '#0f0', label: 'Comment' }
  },
  onClick: (annotation) => {
    console.log('Clicked:', annotation.label);
  },
  shadow: true
});

// Add to viewer
viewer.addLayer('annotations', annotationLayer);
```

Extends

LayerAnnotation

Methods

addControl(name, value)

Adds a shader parameter control

Parameters:

Name	Type	Description
`name`	string	Control identifier
`value`	*	Initial value

Inherited From:

Layer#addControl

Overrides:

LayerAnnotation#addControl

Source:

Layer.js, line 596

Throws:

If control already exists
Type Error

addShader(id, shader)

Adds a shader to the layer's available shaders

Parameters:

Name	Type	Description
`id`	string	Unique identifier for the shader
`shader`	Shader	Shader instance to add

Inherited From:

Layer#addShader

Overrides:

LayerAnnotation#addShader

Source:

Layer.js, line 256

Throws:

If shader with the same id already exists
Type Error

Returns:

This layer instance for method chaining

Type: Layer

Example

```javascript
const customShader = new OpenLIME.Shader({...});
layer.addShader('custom', customShader);
layer.setShader('custom');
```

addShaderFilter(filter)

Adds a filter to the current shader

Parameters:

Name	Type	Description
`filter`	Object	Filter specification

Inherited From:

Layer#addShaderFilter

Overrides:

LayerAnnotation#addShaderFilter

Source:

Layer.js, line 317

Throws:

If no shader is set
Type Error

boundingBox()

Gets layer bounding box in scene coordinates

Inherited From:

Layer#boundingBox

Overrides:

LayerAnnotation#boundingBox

Source:

Layer.js, line 530

Returns:

Bounding box

Type: BoundingBox

clearSelected()

Clears all annotation selections

Overrides:

LayerAnnotation#clearSelected

Source:

LayerSvgAnnotation.js, line 156

clearShaderFilters(name)

Removes all filters from the current shader

Parameters:

Name	Type	Description
`name`	Object	Filter name

Inherited From:

Layer#clearShaderFilters

Overrides:

LayerAnnotation#clearShaderFilters

Source:

Layer.js, line 337

Throws:

If no shader is set
Type Error

derive( [options])

Creates a new Layer that shares tiles with this layer but uses a different shader. This method allows efficient creation of derivative layers that share the same source textures, which is useful for applying different visual effects to the same image data without duplicating resources.

Parameters:

Name Type Argument Default Description

options

Object

{}

Options for the new layer

Properties

Name	Type	Argument	Description
`shaders`	Object	<optional>	Map of shaders for the new layer
`defaultShader`	string	<optional>	ID of shader to set as active
`label`	string	<optional>	Label for the new layer (defaults to original label)
`zindex`	number	<optional>	Z-index for the new layer (defaults to original + 1)
`visible`	boolean	<optional>	Layer visibility (defaults to same as original)
`transform`	Transform	<optional>	Custom transform (defaults to copy of original)
`mipmapBias`	number	<optional>	Custom mipmap bias (defaults to original value)
`pixelSize`	number	<optional>	Custom pixel size (defaults to original value)
`debug`	boolean	<optional>	Debug mode flag (defaults to original value)

Inherited From:

Layer#derive

Overrides:

LayerAnnotation#derive

Source:

Layer.js, line 151

Returns:

A new layer sharing textures with this one

Type: Layer

Example

```javascript
// Create a derived layer with edge detection shader
const enhancedShader = new OpenLIME.ShaderEdgeDetection();
const derivedLayer = originalLayer.derive({
    label: 'Edge Detection',
    shaders: { 'edge': enhancedShader },
    defaultShader: 'edge',
    zindex: 10
});
viewer.addLayer('edges', derivedLayer);
```
or
```javascript
const enhancedShader = new OpenLIME.ShaderEdgeDetection();
const derivedLayer = layer.derive({
    label: 'Enhanced Image'
});
derivedLayer.addShader('enhanced', enhancedShader);
derivedLayer.setShader('enhanced');
viewer.addLayer('Enhanced Image', derivedLayer);
```

getAnnotationById(id)

Retrieves an annotation by its ID

Parameters:

Name	Type	Description
`id`	string	Annotation identifier

Inherited From:

LayerAnnotation#getAnnotationById

Overrides:

LayerAnnotation#getAnnotationById

Source:

LayerAnnotation.js, line 493

Returns:

The found annotation or null if not found

Type: Annotation | null

getAnnotationByIdx(idx)

Retrieves an annotation by its index

Parameters:

Name	Type	Description
`idx`	number \| string	Annotation index

Inherited From:

LayerAnnotation#getAnnotationByIdx

Overrides:

LayerAnnotation#getAnnotationByIdx

Source:

LayerAnnotation.js, line 505

Returns:

The found annotation or null if not found

Type: Annotation | null

getControl(name)

Gets the shader parameter control corresponding to name

Parameters:

Name	Type	Description
`name`	*	The name of the control. return {*} The control

Inherited From:

Layer#getControl

Overrides:

LayerAnnotation#getControl

Source:

Layer.js, line 581

getMode()

Gets the current shader visualization mode

Inherited From:

Layer#getMode

Overrides:

LayerAnnotation#getMode

Source:

Layer.js, line 438

Returns:

Current mode or null if no shader

Type: string | null

getModes()

Gets available shader modes

Inherited From:

Layer#getModes

Overrides:

LayerAnnotation#getModes

Source:

Layer.js, line 448

Returns:

Array of available modes

Type: Array.<string>

getPixelValues(x, y)

Gets pixel values for a specific pixel location Works with both single images and tiled formats

Parameters:

Name	Type	Description
`x`	number	X coordinate in image space (0,0 at top-left)
`y`	number	Y coordinate in image space (0,0 at top-left)

Inherited From:

Layer#getPixelValues

Overrides:

LayerAnnotation#getPixelValues

Source:

Layer.js, line 1240

Returns:

Array containing RGBA values for each raster at the specified pixel

Type: Array.<Uint8Array>

getState( [stateMask])

Gets the current layer state

Parameters:

Name	Type	Argument	Default	Description
`stateMask`	Object	<optional>	null	Optional mask to filter returned state properties

Inherited From:

Layer#getState

Overrides:

LayerAnnotation#getState

Source:

Layer.js, line 363

Returns:

Current state object

Type: Object

getSvgGroupTransform(transform [, inverse])

Calculates SVG group transform string

Parameters:

Name	Type	Argument	Default	Description
`transform`	Transform			Current view transform
`inverse`	boolean	<optional>	false	Whether to return inverse transform

Source:

LayerSvgAnnotation.js, line 212

Returns:

SVG transform attribute value

Type: string

interpolateControls()

Updates control interpolation

Inherited From:

Layer#interpolateControls

Overrides:

LayerAnnotation#interpolateControls

Source:

Layer.js, line 631

Returns:

Whether all interpolations are complete

Type: boolean

<async> loadTile(tile, callback)

Loads and processes a single image tile with optimized resource management. Implements request batching, concurrent loading, and proper error handling.

Parameters:

Name Type Description

tile

Object

Tile specification object

Properties

Name	Type	Argument	Description
`index`	string		Unique tile identifier
`url`	string		Base URL for tile resource
`start`	number	<optional>	Start byte for partial content (for tarzoom)
`end`	number	<optional>	End byte for partial content (for tarzoom)
`offsets`	Array.<Object>	<optional>	Byte offsets for interleaved formats

callback

function

Completion callback(error, size)

Inherited From:

Layer#loadTile

Overrides:

LayerAnnotation#loadTile

Source:

Layer.js, line 1033

Throws:

If tile is already in processing queue
Type Error

Returns:

Type: Promise.<void>

pixelSizePerMM()

Gets pixel size in millimeters

Inherited From:

Layer#pixelSizePerMM

Overrides:

LayerAnnotation#pixelSizePerMM

Source:

Layer.js, line 521

Returns:

Size of one pixel in mm

Type: number

removeShader(id)

Removes a shader from the layer's available shaders

Parameters:

Name	Type	Description
`id`	string	Identifier of the shader to remove

Inherited From:

Layer#removeShader

Overrides:

LayerAnnotation#removeShader

Source:

Layer.js, line 284

Throws:

If shader with the specified id doesn't exist
Type Error

Returns:

This layer instance for method chaining

Type: Layer

Example

```javascript
// Remove a shader that's no longer needed
layer.removeShader('oldEffect');
```

removeShaderFilter(name)

Removes a filter from the current shader

Parameters:

Name	Type	Description
`name`	Object	Filter name

Inherited From:

Layer#removeShaderFilter

Overrides:

LayerAnnotation#removeShaderFilter

Source:

Layer.js, line 327

Throws:

If no shader is set
Type Error

scale()

Gets layer scale

Inherited From:

Layer#scale

Overrides:

LayerAnnotation#scale

Source:

Layer.js, line 511

Returns:

Current scale value

Type: number

setControl(name, value [, dt] [, easing])

Sets a shader control value with optional animation

Parameters:

Name	Type	Argument	Default	Description
`name`	string			Control identifier
`value`	*			New value
`dt`	number	<optional>		Animation duration in ms
`easing`	string	<optional>	'linear'	Easing function

Inherited From:

Layer#setControl

Overrides:

LayerAnnotation#setControl

Source:

Layer.js, line 611

Fires:

Layer#event:update

setMode(mode)

Sets shader visualization mode

Parameters:

Name	Type	Description
`mode`	string	Mode to set

Inherited From:

Layer#setMode

Overrides:

LayerAnnotation#setMode

Source:

Layer.js, line 459

Fires:

Layer#event:update

setSelected(anno [, on])

Sets selection state of an annotation

Parameters:

Name	Type	Argument	Default	Description
`anno`	Annotation			The annotation to select/deselect
`on`	boolean	<optional>	true	Whether to select (true) or deselect (false)

Overrides:

LayerAnnotation#setSelected

Source:

LayerSvgAnnotation.js, line 168

setShader(id)

Sets the active shader

Parameters:

Name	Type	Description
`id`	string	Shader identifier from registered shaders

Inherited From:

Layer#setShader

Overrides:

LayerAnnotation#setShader

Source:

Layer.js, line 424

Fires:

Layer#event:update

Throws:

If shader ID is not found
Type Error

setState(state [, dt] [, easing])

Sets the layer state with optional animation

Parameters:

Name	Type	Argument	Default	Description
`state`	Object			State object with controls and mode
`dt`	number	<optional>		Animation duration in ms
`easing`	string	<optional>	'linear'	Easing function ('linear'\|'ease-out'\|'ease-in-out')