kepler.gl.geoiq
Version:
kepler.gl is a webgl based application to visualize large scale location data in the browser
192 lines (158 loc) • 21.9 kB
JavaScript
;
var _interopRequireDefault = require("@babel/runtime/helpers/interopRequireDefault");
Object.defineProperty(exports, "__esModule", {
value: true
});
exports.hexagonToPolygonGeo = hexagonToPolygonGeo;
exports.getGeojsonDataMaps = getGeojsonDataMaps;
exports.parseGeometryFromString = parseGeometryFromString;
exports.getGeojsonBounds = getGeojsonBounds;
exports.featureToDeckGlGeoType = featureToDeckGlGeoType;
var _defineProperty2 = _interopRequireDefault(require("@babel/runtime/helpers/defineProperty"));
var _typeof2 = _interopRequireDefault(require("@babel/runtime/helpers/typeof"));
var _deck = require("deck.gl");
function ownKeys(object, enumerableOnly) { var keys = Object.keys(object); if (Object.getOwnPropertySymbols) { var symbols = Object.getOwnPropertySymbols(object); if (enumerableOnly) symbols = symbols.filter(function (sym) { return Object.getOwnPropertyDescriptor(object, sym).enumerable; }); keys.push.apply(keys, symbols); } return keys; }
function _objectSpread(target) { for (var i = 1; i < arguments.length; i++) { var source = arguments[i] != null ? arguments[i] : {}; if (i % 2) { ownKeys(Object(source), true).forEach(function (key) { (0, _defineProperty2["default"])(target, key, source[key]); }); } else if (Object.getOwnPropertyDescriptors) { Object.defineProperties(target, Object.getOwnPropertyDescriptors(source)); } else { ownKeys(Object(source)).forEach(function (key) { Object.defineProperty(target, key, Object.getOwnPropertyDescriptor(source, key)); }); } } return target; }
function hexagonToPolygonGeo(_ref, properties, radius, mapState) {
var object = _ref.object;
var viewport = new _deck.WebMercatorViewport(mapState);
var screenCenter = viewport.projectFlat(object.centroid);
var _viewport$getDistance = viewport.getDistanceScales(),
pixelsPerMeter = _viewport$getDistance.pixelsPerMeter;
var pixRadius = radius * pixelsPerMeter[0];
var coordinates = [];
for (var i = 0; i < 6; i++) {
var vertex = hex_corner(screenCenter, pixRadius, i);
coordinates.push(viewport.unprojectFlat(vertex));
}
coordinates.push(coordinates[0]);
return {
geometry: {
type: 'Polygon',
coordinates: [[[77.420654296875, 13.07412756381517], [77.4041748046875, 13.012586029874111], [77.38632202148438, 12.938983710096016], [77.46322631835938, 12.906859517826117], [77.50579833984375, 12.837242952998404], [77.56759643554688, 12.791713999000201], [77.67471313476562, 12.843937692841445], [77.706298828125, 12.86134318154514], [77.73651123046875, 12.920245100143122], [77.75848388671875, 12.981809528732812], [77.7557373046875, 13.047372256948787], [77.61566162109375, 13.169085434871482], [77.53463745117188, 13.099542418228534], [77.420654296875, 13.07412756381517]]]
},
properties: {
fieldIdx: 1
}
}; // return {
// geometry: {
// coordinates,
// type: 'LineString'
// },
// properties
// };
}
function hex_corner(center, radius, i) {
var angle_deg = 60 * i + 30;
var angle_rad = Math.PI / 180 * angle_deg;
return [center[0] + radius * Math.cos(angle_rad), center[1] + radius * Math.sin(angle_rad)];
}
/**
* Parse raw data to geojson feature
* @param allData
* @param getFeature
* @returns {{}}
*/
function getGeojsonDataMaps(allData, getFeature) {
var acceptableTypes = ['Point', 'MultiPoint', 'LineString', 'MultiLineString', 'Polygon', 'MultiPolygon', 'GeometryCollection'];
var dataToFeature = {};
allData.forEach(function (d, index) {
dataToFeature[index] = null;
var rawFeature = getFeature(d);
var feature = null; // parse feature from field
if (Array.isArray(rawFeature)) {
// Support geojson as an array of points
feature = {
type: 'Feature',
geometry: {
// why do we need to flip it...
coordinates: rawFeature.map(function (pts) {
return [pts[1], pts[0]];
}),
type: 'LineString'
}
};
} else if (typeof rawFeature === 'string') {
feature = parseGeometryFromString(rawFeature);
} else if ((0, _typeof2["default"])(rawFeature) === 'object') {
// Support geojson feature as object
// probably need to normalize it as well
var normalized = normalize(rawFeature);
if (!normalized || !Array.isArray(normalized.features)) {
// fail to normalize geojson
return null;
}
feature = normalized.features[0];
}
if (feature && feature.geometry && acceptableTypes.includes(feature.geometry.type)) {
// store index of the data in feature properties
feature.properties = _objectSpread({}, feature.properties || {}, {
index: index
});
dataToFeature[index] = feature;
}
});
return dataToFeature;
}
/**
* Parse geojson from string
* @param {String} geoString
* @returns {null | Object} geojson object or null if failed
*/
function parseGeometryFromString(geoString) {
var parsedGeo; // try parse as geojson string
// {"type":"Polygon","coordinates":[[[-74.158491,40.83594]]]}
try {
parsedGeo = JSON.parse(geoString);
} catch (e) {} // keep trying to parse
// try parse as wkt
if (!parsedGeo) {
try {
parsedGeo = wktParser(geoString);
} catch (e) {
return null;
}
}
if (!parsedGeo) {
return null;
}
var normalized = normalize(parsedGeo);
if (!normalized || !Array.isArray(normalized.features)) {
// fail to normalize geojson
return null;
}
return normalized.features[0];
}
function getGeojsonBounds() {
var features = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : [];
// calculate feature bounds is computation heavy
// here we only pick couple
var samples = features.length > 500 ? getSampleData(features, 500) : features;
var nonEmpty = samples.filter(function (d) {
return d && d.geometry && d.geometry.coordinates && d.geometry.coordinates.length;
});
try {
return geojsonExtent({
type: 'FeatureCollection',
features: nonEmpty
});
} catch (e) {
return null;
}
}
function featureToDeckGlGeoType(type) {
switch (type) {
case 'Point':
case 'MultiPoint':
return 'point';
case 'LineString':
case 'MultiLineString':
return 'line';
case 'Polygon':
case 'MultiPolygon':
return 'polygon';
default:
return null;
}
}
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Copyright (c) 2019 Uber Technologies, Inc.\n//\n// Permission is hereby granted, free of charge, to any person obtaining a copy\n// of this software and associated documentation files (the \"Software\"), to deal\n// in the Software without restriction, including without limitation the rights\n// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\n// copies of the Software, and to permit persons to whom the Software is\n// furnished to do so, subject to the following conditions:\n//\n// The above copyright notice and this permission notice shall be included in\n// all copies or substantial portions of the Software.\n//\n// THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\n// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\n// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\n// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\n// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\n// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN\n// THE SOFTWARE.\n\nimport {WebMercatorViewport} from 'deck.gl';\n\nexport function hexagonToPolygonGeo({object}, properties, radius, mapState) {\n  const viewport = new WebMercatorViewport(mapState);\n\n  const screenCenter = viewport.projectFlat(object.centroid);\n  const {pixelsPerMeter} = viewport.getDistanceScales();\n  const pixRadius = radius * pixelsPerMeter[0];\n\n  const coordinates = [];\n\n  for (let i = 0; i < 6; i++) {\n    const vertex = hex_corner(screenCenter, pixRadius, i);\n    coordinates.push(viewport.unprojectFlat(vertex));\n  }\n\n  coordinates.push(coordinates[0]);\n  return {\n    geometry: {\n      type: 'Polygon',\n      coordinates: [\n        [\n          [77.420654296875, 13.07412756381517],\n          [77.4041748046875, 13.012586029874111],\n          [77.38632202148438, 12.938983710096016],\n          [77.46322631835938, 12.906859517826117],\n          [77.50579833984375, 12.837242952998404],\n          [77.56759643554688, 12.791713999000201],\n          [77.67471313476562, 12.843937692841445],\n          [77.706298828125, 12.86134318154514],\n          [77.73651123046875, 12.920245100143122],\n          [77.75848388671875, 12.981809528732812],\n          [77.7557373046875, 13.047372256948787],\n          [77.61566162109375, 13.169085434871482],\n          [77.53463745117188, 13.099542418228534],\n          [77.420654296875, 13.07412756381517]\n        ]\n      ]\n    },\n    properties: {\n      fieldIdx: 1\n    }\n  };\n  // return {\n  //   geometry: {\n  //     coordinates,\n  //     type: 'LineString'\n  //   },\n  //   properties\n  // };\n}\n\nfunction hex_corner(center, radius, i) {\n  const angle_deg = 60 * i + 30;\n  const angle_rad = (Math.PI / 180) * angle_deg;\n\n  return [\n    center[0] + radius * Math.cos(angle_rad),\n    center[1] + radius * Math.sin(angle_rad)\n  ];\n}\n\n/**\n * Parse raw data to geojson feature\n * @param allData\n * @param getFeature\n * @returns {{}}\n */\nexport function getGeojsonDataMaps(allData, getFeature) {\n  const acceptableTypes = [\n    'Point',\n    'MultiPoint',\n    'LineString',\n    'MultiLineString',\n    'Polygon',\n    'MultiPolygon',\n    'GeometryCollection'\n  ];\n\n  const dataToFeature = {};\n\n  allData.forEach((d, index) => {\n    dataToFeature[index] = null;\n    const rawFeature = getFeature(d);\n\n    let feature = null;\n\n    // parse feature from field\n    if (Array.isArray(rawFeature)) {\n      // Support geojson as an array of points\n      feature = {\n        type: 'Feature',\n        geometry: {\n          // why do we need to flip it...\n          coordinates: rawFeature.map(pts => [pts[1], pts[0]]),\n          type: 'LineString'\n        }\n      };\n    } else if (typeof rawFeature === 'string') {\n      feature = parseGeometryFromString(rawFeature);\n    } else if (typeof rawFeature === 'object') {\n      // Support geojson feature as object\n      // probably need to normalize it as well\n      const normalized = normalize(rawFeature);\n      if (!normalized || !Array.isArray(normalized.features)) {\n        // fail to normalize geojson\n        return null;\n      }\n\n      feature = normalized.features[0];\n    }\n\n    if (\n      feature &&\n      feature.geometry &&\n      acceptableTypes.includes(feature.geometry.type)\n    ) {\n      // store index of the data in feature properties\n      feature.properties = {\n        ...(feature.properties || {}),\n        index\n      };\n\n      dataToFeature[index] = feature;\n    }\n  });\n\n  return dataToFeature;\n}\n\n/**\n * Parse geojson from string\n * @param {String} geoString\n * @returns {null | Object} geojson object or null if failed\n */\nexport function parseGeometryFromString(geoString) {\n  let parsedGeo;\n\n  // try parse as geojson string\n  // {\"type\":\"Polygon\",\"coordinates\":[[[-74.158491,40.83594]]]}\n  try {\n    parsedGeo = JSON.parse(geoString);\n  } catch (e) {\n    // keep trying to parse\n  }\n\n  // try parse as wkt\n  if (!parsedGeo) {\n    try {\n      parsedGeo = wktParser(geoString);\n    } catch (e) {\n      return null;\n    }\n  }\n\n  if (!parsedGeo) {\n    return null;\n  }\n\n  const normalized = normalize(parsedGeo);\n\n  if (!normalized || !Array.isArray(normalized.features)) {\n    // fail to normalize geojson\n    return null;\n  }\n\n  return normalized.features[0];\n}\n\nexport function getGeojsonBounds(features = []) {\n  // calculate feature bounds is computation heavy\n  // here we only pick couple\n  const samples =\n    features.length > 500 ? getSampleData(features, 500) : features;\n\n  const nonEmpty = samples.filter(\n    d =>\n      d && d.geometry && d.geometry.coordinates && d.geometry.coordinates.length\n  );\n\n  try {\n    return geojsonExtent({\n      type: 'FeatureCollection',\n      features: nonEmpty\n    });\n  } catch (e) {\n    return null;\n  }\n}\n\nexport function featureToDeckGlGeoType(type) {\n  switch (type) {\n    case 'Point':\n    case 'MultiPoint':\n      return 'point';\n\n    case 'LineString':\n    case 'MultiLineString':\n      return 'line';\n\n    case 'Polygon':\n    case 'MultiPolygon':\n      return 'polygon';\n\n    default:\n      return null;\n  }\n}\n"]}