grid-cell-layer.md

GridCellLayer

import {GridCellLayerDemo} from '@site/src/doc-demos/layers';

The GridCellLayer can render a grid-based heatmap. It is a variation of the ColumnLayer. It takes the constant width / height of all cells and bottom-left coordinate of each cell. This is the primitive layer rendered by CPUGridLayer after aggregation. Unlike the CPUGridLayer, it renders one column for each data object.

import Tabs from '@theme/Tabs'; import TabItem from '@theme/TabItem';

import {Deck} from '@deck.gl/core';
import {GridCellLayer} from '@deck.gl/layers';

const layer = new GridCellLayer({
  id: 'GridCellLayer',
  data: 'https://raw.githubusercontent.com/visgl/deck.gl-data/master/website/hexagons.json',

  cellSize: 200,
  extruded: true,
  elevationScale: 5000,
  getElevation: d => d.value,
  getFillColor: d => [48, 128, d.value * 255, 255],
  getPosition: d => d.centroid,
  pickable: true
});

new Deck({
  initialViewState: {
    longitude: -122.4,
    latitude: 37.74,
    zoom: 11
  },
  controller: true,
  getTooltip: ({object}) => object && `height: ${object.value * 5000}m`,
  layers: [layer]
});

import {Deck, PickingInfo} from '@deck.gl/core';
import {GridCellLayer} from '@deck.gl/layers';
import type {PickingInfo} from '@deck.gl/core';

type DataType = {
  value: number;
  centroid: [longitude: number, latitude: number];
};

const layer = new GridCellLayer<DataType>({
  id: 'GridCellLayer',
  data: 'https://raw.githubusercontent.com/visgl/deck.gl-data/master/website/hexagons.json',

  cellSize: 200,
  extruded: true,
  elevationScale: 5000,
  getElevation: (d: DataType) => d.value,
  getFillColor: (d: DataType) => [48, 128, d.value * 255, 255],
  getPosition: (d: DataType) => d.centroid,
  pickable: true
});

new Deck({
  initialViewState: {
    longitude: -122.4,
    latitude: 37.74,
    zoom: 11
  },
  controller: true,
  getTooltip: ({object}: PickingInfo<DataType>) => object && `height: ${object.value * 5000}m`,
  layers: [layer]
});

import React from 'react';
import DeckGL from '@deck.gl/react';
import {GridCellLayer} from '@deck.gl/layers';
import type {PickingInfo} from '@deck.gl/core';

type DataType = {
  value: number;
  centroid: [longitude: number, latitude: number];
};

function App() {
  const layer = new GridCellLayer<DataType>({
    id: 'GridCellLayer',
    data: 'https://raw.githubusercontent.com/visgl/deck.gl-data/master/website/hexagons.json',

    cellSize: 200,
    extruded: true,
    elevationScale: 5000,
    getElevation: (d: DataType) => d.value,
    getFillColor: (d: DataType) => [48, 128, d.value * 255, 255],
    getPosition: (d: DataType) => d.centroid,
    pickable: true
  });

  return <DeckGL
    initialViewState={{
      longitude: -122.4,
      latitude: 37.74,
      zoom: 11
    }}
    controller
    getTooltip={({object}: PickingInfo<DataType>) => object && `height: ${object.value * 5000}m`}
    layers={[layer]}
  />;
}

Installation

To install the dependencies from NPM:

npm install deck.gl
# or
npm install @deck.gl/core @deck.gl/layers

import {GridCellLayer} from '@deck.gl/layers';
import type {GridCellLayerProps} from '@deck.gl/layers';

new GridCellLayer<DataT>(...props: GridCellLayerProps<DataT>[]);

To use pre-bundled scripts:

<script src="https://unpkg.com/deck.gl@^9.0.0/dist.min.js"></script>
<!-- or -->
<script src="https://unpkg.com/@deck.gl/core@^9.0.0/dist.min.js"></script>
<script src="https://unpkg.com/@deck.gl/layers@^9.0.0/dist.min.js"></script>

new deck.GridCellLayer({});

Properties

Inherits from all Base Layer properties.

Render Options

cellSize (number, optional) {#cellsize}

• Default: 1000

Size of each grid cell in meters

coverage (number, optional) {#coverage}

• Default: 1

Cell size scale factor. The size of cell is calculated by cellSize * coverage.

elevationScale (number, optional) {#elevationscale}

• Default: 1

Elevation multiplier. The elevation of cell is calculated by elevationScale * getElevation(d). elevationScale is a handy property to scale all cell elevations without updating the data.

extruded (boolean, optional) {#extruded}

• Default: true

Whether to enable grid elevation. If set to false, all grid will be flat.

material (Material, optional) {#material}

• Default: true

This is an object that contains material props for lighting effect applied on extruded polygons. Check the lighting guide for configurable settings.

Data Accessors

getPosition (Accessor<Position>, optional) {#getposition}

• Default: x => x.position

Method called to retrieve the bottom-left corner ([minX, minY]) of each cell.

getColor (Accessor<Color>, optional) {#getcolor}

• Default: [255, 0, 255, 255]

The rgba color of each object, in r, g, b, [a]. Each component is in the 0-255 range.

• If an array is provided, it is used as the color for all objects.
• If a function is provided, it is called on each object to retrieve its color.

getElevation (Accessor<number>, optional) {#getelevation}

• Default: 1000

The elevation of each cell in meters.

• If a number is provided, it is used as the elevation for all objects.
• If a function is provided, it is called on each object to retrieve its elevation.

Source

modules/layers/src/column-layer/grid-cell-layer.ts