@deck.gl/core

What is @deck.gl/core?

@deck.gl/core is a framework-agnostic WebGL-powered library for visualizing large-scale data sets. It provides a set of highly performant, customizable layers and tools for building complex data visualizations.

What are @deck.gl/core's main functionalities?

Layer Management

This code demonstrates how to create a Deck instance and add a GeoJsonLayer to visualize geographical data. The layer management feature allows you to add, remove, and update layers dynamically.

const { Deck, GeoJsonLayer } = require('@deck.gl/core');

const deck = new Deck({
  initialViewState: {
    longitude: -122.45,
    latitude: 37.8,
    zoom: 12
  },
  controller: true,
  layers: [
    new GeoJsonLayer({
      id: 'geojson-layer',
      data: 'https://raw.githubusercontent.com/visgl/deck.gl-data/master/website/bart-stations.json',
      filled: true,
      pointRadiusMinPixels: 5,
      getPointRadius: 100,
      getFillColor: [255, 0, 0, 200]
    })
  ]
});

Custom Layer Creation

This code shows how to create a custom layer by extending the base Layer class. Custom layers allow you to define your own rendering logic and integrate it with the Deck.gl framework.

const { Layer } = require('@deck.gl/core');

class CustomLayer extends Layer {
  initializeState() {
    const { gl } = this.context;
    // Initialize WebGL state
  }

  draw({ uniforms }) {
    const { gl } = this.context;
    // Draw using WebGL
  }
}

const customLayer = new CustomLayer({
  id: 'custom-layer',
  data: []
});

deck.setProps({
  layers: [customLayer]
});

Interactivity

This code demonstrates how to add interactivity to layers, such as hover and click events. The ScatterplotLayer is made pickable, and event handlers are provided to log information when the user interacts with the layer.

const { Deck, ScatterplotLayer } = require('@deck.gl/core');

const deck = new Deck({
  initialViewState: {
    longitude: -122.45,
    latitude: 37.8,
    zoom: 12
  },
  controller: true,
  layers: [
    new ScatterplotLayer({
      id: 'scatterplot-layer',
      data: [{ position: [-122.45, 37.8], size: 100 }],
      getPosition: d => d.position,
      getRadius: d => d.size,
      getColor: [255, 0, 0],
      pickable: true,
      onHover: info => console.log('Hovered:', info),
      onClick: info => console.log('Clicked:', info)
    })
  ]
});

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README

@deck.gl/core

These are deck.gl's core library classes.

See deck.gl for documentation.