@kibeo/loaders.gl-mvt/dist/es5/lib/binary-vector-tile/features-to-binary.js

Loader for Mapbox Vector Tiles

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.featuresToBinary = featuresToBinary;
exports.TEST_EXPORTS = void 0;

var _polygon = require("@math.gl/polygon");

function _createForOfIteratorHelper(o, allowArrayLike) { var it = typeof Symbol !== "undefined" && o[Symbol.iterator] || o["@@iterator"]; if (!it) { if (Array.isArray(o) || (it = _unsupportedIterableToArray(o)) || allowArrayLike && o && typeof o.length === "number") { if (it) o = it; var i = 0; var F = function F() {}; return { s: F, n: function n() { if (i >= o.length) return { done: true }; return { done: false, value: o[i++] }; }, e: function e(_e) { throw _e; }, f: F }; } throw new TypeError("Invalid attempt to iterate non-iterable instance.\nIn order to be iterable, non-array objects must have a [Symbol.iterator]() method."); } var normalCompletion = true, didErr = false, err; return { s: function s() { it = it.call(o); }, n: function n() { var step = it.next(); normalCompletion = step.done; return step; }, e: function e(_e2) { didErr = true; err = _e2; }, f: function f() { try { if (!normalCompletion && it.return != null) it.return(); } finally { if (didErr) throw err; } } }; }

function _unsupportedIterableToArray(o, minLen) { if (!o) return; if (typeof o === "string") return _arrayLikeToArray(o, minLen); var n = Object.prototype.toString.call(o).slice(8, -1); if (n === "Object" && o.constructor) n = o.constructor.name; if (n === "Map" || n === "Set") return Array.from(o); if (n === "Arguments" || /^(?:Ui|I)nt(?:8|16|32)(?:Clamped)?Array$/.test(n)) return _arrayLikeToArray(o, minLen); }

function _arrayLikeToArray(arr, len) { if (len == null || len > arr.length) len = arr.length; for (var i = 0, arr2 = new Array(len); i < len; i++) { arr2[i] = arr[i]; } return arr2; }

function featuresToBinary(features, firstPassData) {
  var options = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : {};
  return fillArrays(features, firstPassData, {
    numericPropKeys: options.numericPropKeys || extractNumericPropKeys(features),
    PositionDataType: options.PositionDataType || Float32Array
  });
}

var TEST_EXPORTS = {
  extractNumericPropKeys: extractNumericPropKeys,
  fillArrays: fillArrays
};
exports.TEST_EXPORTS = TEST_EXPORTS;

function extractNumericPropKeys(features) {
  var numericPropKeys = {};

  var _iterator = _createForOfIteratorHelper(features),
      _step;

  try {
    for (_iterator.s(); !(_step = _iterator.n()).done;) {
      var feature = _step.value;

      if (feature.properties) {
        for (var key in feature.properties) {
          var numericSoFar = numericPropKeys[key];

          if (numericSoFar || numericSoFar === undefined) {
            var val = feature.properties[key];
            numericPropKeys[key] = isNumeric(val);
          }
        }
      }
    }
  } catch (err) {
    _iterator.e(err);
  } finally {
    _iterator.f();
  }

  return Object.keys(numericPropKeys).filter(function (k) {
    return numericPropKeys[k];
  });
}

function fillArrays(features) {
  var firstPassData = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : {};
  var options = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : {};
  var pointPositionsCount = firstPassData.pointPositionsCount,
      pointFeaturesCount = firstPassData.pointFeaturesCount,
      linePositionsCount = firstPassData.linePositionsCount,
      linePathsCount = firstPassData.linePathsCount,
      lineFeaturesCount = firstPassData.lineFeaturesCount,
      polygonPositionsCount = firstPassData.polygonPositionsCount,
      polygonObjectsCount = firstPassData.polygonObjectsCount,
      polygonRingsCount = firstPassData.polygonRingsCount,
      polygonFeaturesCount = firstPassData.polygonFeaturesCount;
  var numericPropKeys = options.numericPropKeys,
      _options$PositionData = options.PositionDataType,
      PositionDataType = _options$PositionData === void 0 ? Float32Array : _options$PositionData;
  var coordLength = 2;
  var GlobalFeatureIdsDataType = features.length > 65535 ? Uint32Array : Uint16Array;
  var points = {
    positions: new PositionDataType(pointPositionsCount * coordLength),
    globalFeatureIds: new GlobalFeatureIdsDataType(pointPositionsCount),
    featureIds: pointFeaturesCount > 65535 ? new Uint32Array(pointPositionsCount) : new Uint16Array(pointPositionsCount),
    numericProps: {},
    properties: []
  };
  var lines = {
    pathIndices: linePositionsCount > 65535 ? new Uint32Array(linePathsCount + 1) : new Uint16Array(linePathsCount + 1),
    positions: new PositionDataType(linePositionsCount * coordLength),
    globalFeatureIds: new GlobalFeatureIdsDataType(linePositionsCount),
    featureIds: lineFeaturesCount > 65535 ? new Uint32Array(linePositionsCount) : new Uint16Array(linePositionsCount),
    numericProps: {},
    properties: []
  };
  var polygons = {
    polygonIndices: polygonPositionsCount > 65535 ? new Uint32Array(polygonObjectsCount + 1) : new Uint16Array(polygonObjectsCount + 1),
    primitivePolygonIndices: polygonPositionsCount > 65535 ? new Uint32Array(polygonRingsCount + 1) : new Uint16Array(polygonRingsCount + 1),
    positions: new PositionDataType(polygonPositionsCount * coordLength),
    triangles: [],
    globalFeatureIds: new GlobalFeatureIdsDataType(polygonPositionsCount),
    featureIds: polygonFeaturesCount > 65535 ? new Uint32Array(polygonPositionsCount) : new Uint16Array(polygonPositionsCount),
    numericProps: {},
    properties: []
  };

  for (var _i = 0, _arr = [points, lines, polygons]; _i < _arr.length; _i++) {
    var object = _arr[_i];

    var _iterator2 = _createForOfIteratorHelper(numericPropKeys),
        _step2;

    try {
      for (_iterator2.s(); !(_step2 = _iterator2.n()).done;) {
        var propName = _step2.value;
        object.numericProps[propName] = new Float32Array(object.positions.length / coordLength);
      }
    } catch (err) {
      _iterator2.e(err);
    } finally {
      _iterator2.f();
    }
  }

  lines.pathIndices[linePathsCount] = linePositionsCount;
  polygons.polygonIndices[polygonObjectsCount] = polygonPositionsCount;
  polygons.primitivePolygonIndices[polygonRingsCount] = polygonPositionsCount;
  var indexMap = {
    pointPosition: 0,
    pointFeature: 0,
    linePosition: 0,
    linePath: 0,
    lineFeature: 0,
    polygonPosition: 0,
    polygonObject: 0,
    polygonRing: 0,
    polygonFeature: 0,
    feature: 0
  };

  var _iterator3 = _createForOfIteratorHelper(features),
      _step3;

  try {
    for (_iterator3.s(); !(_step3 = _iterator3.n()).done;) {
      var feature = _step3.value;
      var geometry = feature.geometry;
      var properties = feature.properties || {};

      switch (geometry.type) {
        case 'Point':
        case 'MultiPoint':
          handlePoint(geometry, points, indexMap, coordLength, properties);
          points.properties.push(keepStringProperties(properties, numericPropKeys));
          indexMap.pointFeature++;
          break;

        case 'LineString':
        case 'MultiLineString':
          handleLineString(geometry, lines, indexMap, coordLength, properties);
          lines.properties.push(keepStringProperties(properties, numericPropKeys));
          indexMap.lineFeature++;
          break;

        case 'Polygon':
        case 'MultiPolygon':
          handlePolygon(geometry, polygons, indexMap, coordLength, properties);
          polygons.properties.push(keepStringProperties(properties, numericPropKeys));
          indexMap.polygonFeature++;
          break;

        default:
          throw new Error('Invalid geometry type');
      }

      indexMap.feature++;
    }
  } catch (err) {
    _iterator3.e(err);
  } finally {
    _iterator3.f();
  }

  return makeAccessorObjects(points, lines, polygons, coordLength);
}

function handlePoint(geometry, points, indexMap, coordLength, properties) {
  points.positions.set(geometry.data, indexMap.pointPosition * coordLength);
  var nPositions = geometry.data.length / coordLength;
  fillNumericProperties(points, properties, indexMap.pointPosition, nPositions);
  points.globalFeatureIds.fill(indexMap.feature, indexMap.pointPosition, indexMap.pointPosition + nPositions);
  points.featureIds.fill(indexMap.pointFeature, indexMap.pointPosition, indexMap.pointPosition + nPositions);
  indexMap.pointPosition += nPositions;
}

function handleLineString(geometry, lines, indexMap, coordLength, properties) {
  lines.positions.set(geometry.data, indexMap.linePosition * coordLength);
  var nPositions = geometry.data.length / coordLength;
  fillNumericProperties(lines, properties, indexMap.linePosition, nPositions);
  lines.globalFeatureIds.fill(indexMap.feature, indexMap.linePosition, indexMap.linePosition + nPositions);
  lines.featureIds.fill(indexMap.lineFeature, indexMap.linePosition, indexMap.linePosition + nPositions);

  for (var i = 0, il = geometry.lines.length; i < il; ++i) {
    var start = geometry.lines[i];
    var end = i === il - 1 ? geometry.data.length : geometry.lines[i + 1];
    lines.pathIndices[indexMap.linePath++] = indexMap.linePosition;
    indexMap.linePosition += (end - start) / coordLength;
  }
}

function handlePolygon(geometry, polygons, indexMap, coordLength, properties) {
  polygons.positions.set(geometry.data, indexMap.polygonPosition * coordLength);
  var nPositions = geometry.data.length / coordLength;
  fillNumericProperties(polygons, properties, indexMap.polygonPosition, nPositions);
  polygons.globalFeatureIds.fill(indexMap.feature, indexMap.polygonPosition, indexMap.polygonPosition + nPositions);
  polygons.featureIds.fill(indexMap.polygonFeature, indexMap.polygonPosition, indexMap.polygonPosition + nPositions);

  for (var l = 0, ll = geometry.lines.length; l < ll; ++l) {
    var startPosition = indexMap.polygonPosition;
    polygons.polygonIndices[indexMap.polygonObject++] = startPosition;
    var areas = geometry.areas[l];
    var lines = geometry.lines[l];
    var nextLines = geometry.lines[l + 1];

    for (var i = 0, il = lines.length; i < il; ++i) {
      var start = lines[i];
      var end = i === il - 1 ? nextLines === undefined ? geometry.data.length : nextLines[0] : lines[i + 1];
      polygons.primitivePolygonIndices[indexMap.polygonRing++] = indexMap.polygonPosition;
      indexMap.polygonPosition += (end - start) / coordLength;
    }

    var endPosition = indexMap.polygonPosition;
    triangulatePolygon(polygons, areas, lines, {
      startPosition: startPosition,
      endPosition: endPosition,
      coordLength: coordLength
    });
  }
}

function triangulatePolygon(polygons, areas, lines, _ref) {
  var startPosition = _ref.startPosition,
      endPosition = _ref.endPosition,
      coordLength = _ref.coordLength;
  var start = startPosition * coordLength;
  var end = endPosition * coordLength;
  var polygonPositions = polygons.positions.subarray(start, end);
  var offset = lines[0];
  var holes = lines.slice(1).map(function (n) {
    return (n - offset) / coordLength;
  });
  var indices = (0, _polygon.earcut)(polygonPositions, holes, coordLength, areas);

  for (var t = 0, tl = indices.length; t < tl; ++t) {
    polygons.triangles.push(startPosition + indices[t]);
  }
}

function makeAccessorObjects(points, lines, polygons, coordLength) {
  var returnObj = {
    points: {
      positions: {
        value: points.positions,
        size: coordLength
      },
      globalFeatureIds: {
        value: points.globalFeatureIds,
        size: 1
      },
      featureIds: {
        value: points.featureIds,
        size: 1
      },
      numericProps: points.numericProps,
      properties: points.properties
    },
    lines: {
      pathIndices: {
        value: lines.pathIndices,
        size: 1
      },
      positions: {
        value: lines.positions,
        size: coordLength
      },
      globalFeatureIds: {
        value: lines.globalFeatureIds,
        size: 1
      },
      featureIds: {
        value: lines.featureIds,
        size: 1
      },
      numericProps: lines.numericProps,
      properties: lines.properties
    },
    polygons: {
      polygonIndices: {
        value: polygons.polygonIndices,
        size: 1
      },
      primitivePolygonIndices: {
        value: polygons.primitivePolygonIndices,
        size: 1
      },
      positions: {
        value: polygons.positions,
        size: coordLength
      },
      triangles: {
        value: new Uint32Array(polygons.triangles),
        size: 1
      },
      globalFeatureIds: {
        value: polygons.globalFeatureIds,
        size: 1
      },
      featureIds: {
        value: polygons.featureIds,
        size: 1
      },
      numericProps: polygons.numericProps,
      properties: polygons.properties
    }
  };

  for (var geomType in returnObj) {
    for (var numericProp in returnObj[geomType].numericProps) {
      returnObj[geomType].numericProps[numericProp] = {
        value: returnObj[geomType].numericProps[numericProp],
        size: 1
      };
    }
  }

  return returnObj;
}

function fillNumericProperties(object, properties, index, length) {
  for (var numericPropName in object.numericProps) {
    if (numericPropName in properties) {
      object.numericProps[numericPropName].fill(properties[numericPropName], index, index + length);
    }
  }
}

function keepStringProperties(properties, numericKeys) {
  var props = {};

  for (var key in properties) {
    if (!numericKeys.includes(key)) {
      props[key] = properties[key];
    }
  }

  return props;
}

function isNumeric(x) {
  return Number.isFinite(x);
}
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