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Showing content from https://developers.arcgis.com/javascript/latest/api-reference/esri-layers-support-PixelBlock.html below:

PixelBlock | API Reference | ArcGIS Maps SDK for JavaScript 4.33

ESM: import PixelBlock from "@arcgis/core/layers/support/PixelBlock.js";

CDN: const PixelBlock = await $arcgis.import("@arcgis/core/layers/support/PixelBlock.js");

Class: @arcgis/core/layers/support/PixelBlock

Since: ArcGIS Maps SDK for JavaScript 4.0

An object representing the pixel arrays in the view. It stores and decodes source data fetched from an image service associated with an ImageryLayer. This provides the user access to each pixel on the client via the pixels property. The PixelBlock object is designed to handle generic pixel arrays from any raster data source.

See also

• ImageryLayer

• Sample - Access pixel values in an ImageryLayer

PixelBlock Constructor new PixelBlock(properties)

Parameter

optional

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

Show inherited properties Hide inherited properties

declaredClass

Inherited

Property declaredClass Stringreadonly

Since: ArcGIS Maps SDK for JavaScript 4.7 Accessor since 4.0, declaredClass added at 4.7.

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

The height (or number of rows) of the PixelBlock in pixels.

An array of nodata mask. All pixels are valid when mask is null.

maskIsAlpha Property maskIsAlpha Boolean

Indicates whether mask should be used as alpha values. If no (default), a pixel is valid when corresponding mask value is truthy

pixelType Property pixelType String

The pixel type.

Possible Values:"unknown" |"s8" |"s16" |"s32" |"u1" |"u2" |"u4" |"u8" |"u16" |"u32" |"f32" |"f64" |"c64" |"c128"

A two dimensional array representing the pixels from the Image Service displayed on the client. The length of the first dimension is the same as the number of bands in the layer. The length of the second dimension is height * width. The length of each band is the same. The pixels in each band are arranged row by row in this format: [p_00, p_10, p_20, ... p_10, p_11, ...] where p_xy is the pixel value at the column x and row y.

Example

let pixels = imgLyr.pixelData.pixelBlock.pixels;
// Prints the number of bands in the layer
console.log(pixels.length);
// An array containing all the pixels in the first band
let band1 = pixels[0];

An array of objects containing numeric statistical properties. Each object has the following specification if defined.

Properties

optional

The maximum pixel value in the pixels array.

optional

The minimum pixel value in the pixels array.

optional

Value representing areas of no data.

The width (or number of columns) of the PixelBlock in pixels.

Show inherited methods Hide inherited methods

addData Method addData(planeData)

Adds another plane to the PixelBlock.

Parameters

Specification

The data to add to the PixelBlock.

Parameters

Specification

An array representing the pixel data to add.

optional

An object containing numeric statistical properties.

Specification

The minimum pixel value in the pixels array.

The maximum pixel value in the pixels array.

Value representing areas of no data.

addHandles

Inherited

Method addHandles(handleOrHandles, groupKey)

Since: ArcGIS Maps SDK for JavaScript 4.25 Accessor since 4.0, addHandles added at 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

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.

Returns pixels and masks using a single array in bip format (e.g. [p_00_r, p_00_g, p_00_b, p_00_a, p_10_r, p_10_g, p_10_b, p_10_a, .....]). Use this method to get an unsigned 8 bit pixel array. The result can be used to create a webgl texture.

Returns

Similar to getAsRGBA, but returns floating point data. The result can be used to create a webgl texture (OES_texture_float).

Returns

Returns the plane band count of the PixelBlock.

Returns

hasHandles

Inherited

Method hasHandles(groupKey){Boolean}

Since: ArcGIS Maps SDK for JavaScript 4.25 Accessor since 4.0, hasHandles added at 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

Inherited

Method removeHandles(groupKey)

Since: ArcGIS Maps SDK for JavaScript 4.25 Accessor since 4.0, removeHandles added at 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");

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