RasterColormapRenderer

AMD: require(["esri/renderers/RasterColormapRenderer"], (RasterColormapRenderer) => { /* code goes here */ });
ESM: import RasterColormapRenderer from "@arcgis/core/renderers/RasterColormapRenderer.js";
Class: esri/renderers/RasterColormapRenderer
Inheritance: RasterColormapRenderer Accessor
Since: ArcGIS Maps SDK for JavaScript 4.16

The RasterColormapRenderer defines the symbology to display raster data based on specific colors, aiding in visual analysis of the data. For example, a forestry commission may want to quickly visualize areas above and below the treeline occurring at a known elevation on a raster containing elevation values. They could overlay a transparent colormap set to color those areas below the treeline elevation green, and those above white.

The RasterColormapRenderer is only available if a color map is present in an ImageryLayer or ImageryTileLayer. Otherwise, you can use the UniqueValueRenderer to apply colors to your layer.

Constructors

new RasterColormapRenderer(properties)
Parameter
properties Object
optional

See the properties for a list of all the properties that may be passed into the constructor.

Examples
// create a new RasterColormapRenderer from provided the colormap array
const renderer = RasterColormapRenderer.createFromColormap(colors);
// create a new RasterColormapRenderer
const renderer = new RasterColormapRenderer({
 colormapInfos: colormapInfos
});

Property Overview

Any properties can be set, retrieved or listened to. See the Working with Properties topic.
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Name Type Summary Class
ColormapInfo[]

A colormap info array containing mappings for pixel and RGB color values.

more details
RasterColormapRenderer
String

The name of the class.

more details
Accessor
String

The type of Renderer.

more details
RasterColormapRenderer

Property Details

colormapInfos ColormapInfo[]autocast

A colormap info array containing mappings for pixel and RGB color values. Colormaps contain a set of values that are associated with colors and pixel values, and are used to display a single-band raster consistently with the same colors.

declaredClass Stringreadonly inherited

The name of the class. The declared class name is formatted as esri.folder.className.

type Stringreadonly

The type of Renderer.

For RasterColormapRenderer the type is always "raster-colormap".

Method Overview

Show inherited methods Hide inherited methods
Name Return Type Summary Class

Adds one or more handles which are to be tied to the lifecycle of the object.

more details
Accessor
RasterColormapRenderer

Creates a deep clone of the renderer.

more details
RasterColormapRenderer
RasterColormapRenderer

Creates a new instance RasterColormapRenderer from an array of color maps where pixel values with its corresponding RGB color values specified.

more details
RasterColormapRenderer
*

Creates a new instance of this class and initializes it with values from a JSON object generated from an ArcGIS product.

more details
RasterColormapRenderer
Boolean

Returns true if a named group of handles exist.

more details
Accessor

Removes a group of handles owned by the object.

more details
Accessor
Object

Converts an instance of this class to its ArcGIS portal JSON representation.

more details
RasterColormapRenderer

Method Details

addHandles(handleOrHandles, groupKey)inherited
Since: ArcGIS Maps SDK for JavaScript 4.25

Adds one or more handles which are to be tied to the lifecycle of the object. The handles will be removed when the object is destroyed.

// Manually manage handles
const handle = reactiveUtils.when(
  () => !view.updating,
  () => {
    wkidSelect.disabled = false;
  },
  { once: true }
);

this.addHandles(handle);

// Destroy the object
this.destroy();
Parameters
handleOrHandles WatchHandle|WatchHandle[]

Handles marked for removal once the object is destroyed.

groupKey *
optional

Key identifying the group to which the handles should be added. All the handles in the group can later be removed with Accessor.removeHandles(). If no key is provided the handles are added to a default group.

Creates a deep clone of the renderer.

Returns
Type Description
RasterColormapRenderer A deep clone of the object that invoked this method.
Example
// Creates a deep clone of the first layer's renderer
let renderer = view.map.layers.at(0).renderer.clone();
createFromColormap(colormap){RasterColormapRenderer}static

Creates a new instance RasterColormapRenderer from an array of color maps where pixel values with its corresponding RGB color values specified.

Parameter
colormap Number[][]

RGB color representation of pixel values. Each item in the colormap array has an array of the pixel value and red, green, and blue values.

Returns
Type Description
RasterColormapRenderer Returns a new instance RasterColormapRenderer based on provided colormap.
Example
// create a color map where values 0-199 are pink and 200-250 are light blue.
let colors = [];
for (let i = 0; i <= 250; i++) {
  if (i < 200) {
    colors.push([i, 250, 0, 128]);
  } else {
    colors.push([i, 0, 128, 250]);
  }
}

// create a RasterColormapRenderer from the colors array
const renderer = RasterColormapRenderer.createFromColormap(colors);
fromJSON(json){*}static

Creates a new instance of this class and initializes it with values from a JSON object generated from an ArcGIS product. The object passed into the input json parameter often comes from a response to a query operation in the REST API or a toJSON() method from another ArcGIS product. See the Using fromJSON() topic in the Guide for details and examples of when and how to use this function.

Parameter
json Object

A JSON representation of the instance in the ArcGIS format. See the ArcGIS REST API documentation for examples of the structure of various input JSON objects.

Returns
Type Description
* Returns a new instance of this class.
hasHandles(groupKey){Boolean}inherited
Since: ArcGIS Maps SDK for JavaScript 4.25

Returns true if a named group of handles exist.

Parameter
groupKey *
optional

A group key.

Returns
Type Description
Boolean Returns true if a named group of handles exist.
Example
// Remove a named group of handles if they exist.
if (obj.hasHandles("watch-view-updates")) {
  obj.removeHandles("watch-view-updates");
}
removeHandles(groupKey)inherited
Since: ArcGIS Maps SDK for JavaScript 4.25

Removes a group of handles owned by the object.

Parameter
groupKey *
optional

A group key or an array or collection of group keys to remove.

Example
obj.removeHandles(); // removes handles from default group

obj.removeHandles("handle-group");
obj.removeHandles("other-handle-group");
toJSON(){Object}

Converts an instance of this class to its ArcGIS portal JSON representation. See the Using fromJSON() guide topic for more information.

Returns
Type Description
Object The ArcGIS portal JSON representation of an instance of this class.

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