Chapter 570: Lut

Core Idea

Represents a lookup table for colormaps. It is used to determine the color values from a range of data values.

const lut = new Lut( 'rainbow', 512 );
const color = lut.getColor( 0.5 );

Constructor

Signature
`new Lut( colormap : 'rainbow'

Properties

Property	Description
`.isLut : boolean (readonly)`	This flag can be used for type testing.
`.lut : Array.<Color>`	The lookup table for the selected color map
`.map : Array.<Array.<number>>`	The currently selected color map.
`.maxV : number`	The maximum value to be represented with the lookup table.
`.minV : number`	The minimum value to be represented with the lookup table.
`.n : number`	The number of colors of the current selected color map.

Methods

Method	Description
`.addColorMap( name : string, arrayOfColors : Array.<Array.<number>> ) : Lut`	Adds a color map to this Lut instance.
`.copy( lut : Lut ) : Lut`	Copies the given lut.
`.createCanvas() : HTMLCanvasElement`	Creates a canvas in order to visualize the lookup table as a texture.
`.getColor( alpha : number ) : Color`	Returns an instance of Color for the given data value.
`.set( value : Lut ) : Lut`	Sets the given LUT.
`.setColorMap( colormap : string, count : number ) : Lut`	Configure the lookup table for the given color map and number of colors.
`.setMax( max : number ) : Lut`	Sets the maximum value to be represented with this LUT.
`.setMin( min : number ) : Lut`	Sets the minimum value to be represented with this LUT.
`.updateCanvas( canvas : HTMLCanvasElement ) : HTMLCanvasElement`	Updates the given canvas with the Lut's data.