class

UniqueValueRenderer

implements IRenderer

Assigns symbols based on a feature attribute value. Use for categorical data (e.g. country, type, status).

Constructor Options Properties Methods Example

Constructor

new UniqueValueRenderer(options: UniqueValueRendererOptions)

Parameter	Type		Description
`options`	`UniqueValueRendererOptions`	required	Renderer configuration

`UniqueValueRendererOptions`

Field	Type		Description
`field`	`string`	required	Attribute field name to classify on
`defaultSymbol`	`Symbol`	required	Fallback symbol when no match found
`uniqueValues`	`UniqueValueInfo[]`	required	Array of { value, symbol } pairs

Properties

Name	Type	Access	Description
`type`	`'unique-value'`	readonly	Renderer type discriminant
`field`	`string`	readonly	Attribute field name
`defaultSymbol`	`Symbol`	readonly	Fallback symbol

Methods

getSymbol()

getSymbol(feature: Feature, context?: SymbolRenderContext): Symbol

Look up symbol by attribute value. Falls back to defaultSymbol.

Returns Symbol

Example

const renderer = new UniqueValueRenderer({
  field: 'type',
  defaultSymbol: { type: 'simple-marker', color: [128,128,128,255], size: 6 },
  uniqueValues: [
    { value: 'airport', symbol: { type: 'simple-marker', color: [0,100,255,255], size: 10 } },
    { value: 'station', symbol: { type: 'simple-marker', color: [0,200,0,255], size: 8 } },
  ],
});