@deck.gl/layers/dist/esm/geojson-layer/geojson-binary.js

deck.gl core layers

export function binaryToFeatureForAccesor(data, index) {
  if (!data) {
    return null;
  }

  const featureIndex = 'startIndices' in data ? data.startIndices[index] : index;
  const geometryIndex = data.featureIds.value[featureIndex];

  if (featureIndex !== -1) {
    return getPropertiesForIndex(data, geometryIndex, featureIndex);
  }

  return null;
}

function getPropertiesForIndex(data, propertiesIndex, numericPropsIndex) {
  const feature = {
    properties: { ...data.properties[propertiesIndex]
    }
  };

  for (const prop in data.numericProps) {
    feature.properties[prop] = data.numericProps[prop].value[numericPropsIndex];
  }

  return feature;
}

export function calculatePickingColors(geojsonBinary, encodePickingColor) {
  const pickingColors = {
    points: null,
    lines: null,
    polygons: null
  };

  for (const key in pickingColors) {
    const featureIds = geojsonBinary[key].globalFeatureIds.value;
    pickingColors[key] = new Uint8ClampedArray(featureIds.length * 3);
    const pickingColor = [];

    for (let i = 0; i < featureIds.length; i++) {
      encodePickingColor(featureIds[i], pickingColor);
      pickingColors[key][i * 3 + 0] = pickingColor[0];
      pickingColors[key][i * 3 + 1] = pickingColor[1];
      pickingColors[key][i * 3 + 2] = pickingColor[2];
    }
  }

  return pickingColors;
}
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