kepler.gl
Version:
kepler.gl is a webgl based application to visualize large scale location data in the browser
166 lines (160 loc) • 20 kB
JavaScript
"use strict";
var _interopRequireDefault = require("@babel/runtime/helpers/interopRequireDefault");
Object.defineProperty(exports, "__esModule", {
value: true
});
exports.decodeTile = decodeTile;
exports.getTileData = getTileData;
exports.vectorTileFeatureToProp = vectorTileFeatureToProp;
var _pbf = _interopRequireDefault(require("pbf"));
var _vectorTile = require("@mapbox/vector-tile");
var _viewportMercatorProject = require("viewport-mercator-project");
// SPDX-License-Identifier: MIT
// Copyright contributors to the kepler.gl project
/* global fetch */
var TILE_SIZE = 512;
var MAPBOX_HOST = 'https://a.tiles.mapbox.com';
var MAP_SOURCE = '/v4/mapbox.mapbox-streets-v7';
function getTileData(host, token, _ref) {
var _ref$index = _ref.index,
x = _ref$index.x,
y = _ref$index.y,
z = _ref$index.z;
var mapSource = "".concat(host || MAPBOX_HOST).concat(MAP_SOURCE, "/").concat(z, "/").concat(x, "/").concat(y, ".vector.pbf?access_token=").concat(token);
return fetch(mapSource).then(function (response) {
return response.arrayBuffer();
}).then(function (buffer) {
return decodeTile(x, y, z, buffer);
});
}
function decodeTile(x, y, z, arrayBuffer) {
var tile = new _vectorTile.VectorTile(new _pbf["default"](arrayBuffer));
var result = [];
var xProj = x * TILE_SIZE;
var yProj = y * TILE_SIZE;
var scale = Math.pow(2, z);
var projectFunc = project.bind(null, xProj, yProj, scale);
/* eslint-disable guard-for-in */
var layerName = 'building';
var vectorTileLayer = tile.layers[layerName];
if (!vectorTileLayer) {
return [];
}
for (var i = 0; i < vectorTileLayer.length; i++) {
var vectorTileFeature = vectorTileLayer.feature(i);
// @ts-ignore
var features = vectorTileFeatureToProp(vectorTileFeature, projectFunc);
features.forEach(function (f) {
f.properties.layer = layerName;
if (f.properties.height) {
result.push(f);
}
});
}
return result;
}
function project(x, y, scale, line, extent) {
var sizeToPixel = extent / TILE_SIZE;
for (var ii = 0; ii < line.length; ii++) {
var p = line[ii];
// LNGLAT
line[ii] = (0, _viewportMercatorProject.worldToLngLat)([x + p[0] / sizeToPixel, y + p[1] / sizeToPixel], scale);
}
}
/* adapted from @mapbox/vector-tile/lib/vectortilefeature.js for better perf */
/* eslint-disable */
function vectorTileFeatureToProp(vectorTileFeature, project) {
var coords = getCoordinates(vectorTileFeature);
var extent = vectorTileFeature.extent;
var i;
var j;
coords = classifyRings(coords);
for (i = 0; i < coords.length; i++) {
for (j = 0; j < coords[i].length; j++) {
project(coords[i][j], extent);
}
}
return coords.map(function (coordinates) {
return {
coordinates: coordinates,
properties: vectorTileFeature.properties
};
});
}
function getCoordinates(vectorTileFeature) {
var pbf = vectorTileFeature._pbf;
pbf.pos = vectorTileFeature._geometry;
var end = pbf.readVarint() + pbf.pos;
var cmd = 1;
var length = 0;
var x = 0;
var y = 0;
var lines = [];
var line;
while (pbf.pos < end) {
if (length <= 0) {
var cmdLen = pbf.readVarint();
cmd = cmdLen & 0x7;
length = cmdLen >> 3;
}
length--;
if (cmd === 1 || cmd === 2) {
x += pbf.readSVarint();
y += pbf.readSVarint();
if (cmd === 1) {
// moveTo
if (line) lines.push(line);
line = [];
}
if (line) line.push([x, y]);
} else if (cmd === 7) {
// Workaround for https://github.com/mapbox/mapnik-vector-tile/issues/90
if (line) {
line.push(line[0].slice()); // closePolygon
}
} else {
throw new Error("unknown command ".concat(cmd));
}
}
if (line) lines.push(line);
return lines;
}
// classifies an array of rings into polygons with outer rings and holes
function classifyRings(rings) {
var len = rings.length;
if (len <= 1) return [rings];
var polygons = [];
var polygon;
var ccw;
for (var i = 0; i < len; i++) {
var area = signedArea(rings[i]);
if (area === 0) {
continue;
}
if (ccw === undefined) {
ccw = area < 0;
}
if (ccw === area < 0) {
if (polygon) {
polygons.push(polygon);
}
polygon = [rings[i]];
} else if (polygon) {
polygon.push(rings[i]);
}
}
if (polygon) {
polygons.push(polygon);
}
return polygons;
}
function signedArea(ring) {
var sum = 0;
for (var i = 0, len = ring.length, j = len - 1, p1, p2; i < len; j = i++) {
p1 = ring[i];
p2 = ring[j];
sum += (p2[0] - p1[0]) * (p1[1] + p2[1]);
}
return sum;
}
//# 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SPDX-License-Identifier: MIT\n// Copyright contributors to the kepler.gl project\n\nimport Protobuf from 'pbf';\nimport {VectorTile} from '@mapbox/vector-tile';\nimport {worldToLngLat} from 'viewport-mercator-project';\nimport {\n  Coordinates,\n  FlatFigure,\n  TileDataItem,\n  VectorTileFeature,\n  VectorTileFeatureProperties\n} from './types';\n\n/* global fetch */\nconst TILE_SIZE = 512;\nconst MAPBOX_HOST = 'https://a.tiles.mapbox.com';\nconst MAP_SOURCE = '/v4/mapbox.mapbox-streets-v7';\n\nexport function getTileData(\n  host: string,\n  token: string,\n  {index: {x, y, z}}: {index: Coordinates}\n): Promise<TileDataItem[]> {\n  const mapSource = `${\n    host || MAPBOX_HOST\n  }${MAP_SOURCE}/${z}/${x}/${y}.vector.pbf?access_token=${token}`;\n\n  return fetch(mapSource)\n    .then(response => response.arrayBuffer())\n    .then(buffer => decodeTile(x, y, z, buffer));\n}\n\nexport function decodeTile(\n  x: number,\n  y: number,\n  z: number,\n  arrayBuffer: ArrayBuffer\n): TileDataItem[] {\n  const tile = new VectorTile(new Protobuf(arrayBuffer));\n\n  const result: TileDataItem[] = [];\n  const xProj = x * TILE_SIZE;\n  const yProj = y * TILE_SIZE;\n  const scale = Math.pow(2, z);\n\n  const projectFunc = project.bind(null, xProj, yProj, scale);\n\n  /* eslint-disable guard-for-in */\n  const layerName = 'building';\n  const vectorTileLayer = tile.layers[layerName];\n  if (!vectorTileLayer) {\n    return [];\n  }\n  for (let i = 0; i < vectorTileLayer.length; i++) {\n    const vectorTileFeature = vectorTileLayer.feature(i);\n    // @ts-ignore\n    const features = vectorTileFeatureToProp(vectorTileFeature, projectFunc);\n    features.forEach(f => {\n      f.properties.layer = layerName;\n      if (f.properties.height) {\n        result.push(f);\n      }\n    });\n  }\n  return result;\n}\n\nfunction project(x: number, y: number, scale: number, line: FlatFigure, extent: number): void {\n  const sizeToPixel = extent / TILE_SIZE;\n\n  for (let ii = 0; ii < line.length; ii++) {\n    const p = line[ii];\n    // LNGLAT\n    line[ii] = worldToLngLat([x + p[0] / sizeToPixel, y + p[1] / sizeToPixel], scale);\n  }\n}\n\n/* adapted from @mapbox/vector-tile/lib/vectortilefeature.js for better perf */\n/* eslint-disable */\nexport function vectorTileFeatureToProp(\n  vectorTileFeature: VectorTileFeature,\n  project: (r: FlatFigure, n: number) => void\n): {coordinates: FlatFigure[]; properties: VectorTileFeatureProperties}[] {\n  let coords: FlatFigure[][] | FlatFigure[] = getCoordinates(vectorTileFeature);\n  const extent = vectorTileFeature.extent;\n  let i: number;\n  let j: number;\n\n  coords = classifyRings(coords);\n  for (i = 0; i < coords.length; i++) {\n    for (j = 0; j < coords[i].length; j++) {\n      project(coords[i][j], extent);\n    }\n  }\n\n  return coords.map(coordinates => ({\n    coordinates,\n    properties: vectorTileFeature.properties\n  }));\n}\n\nfunction getCoordinates(vectorTileFeature: VectorTileFeature): FlatFigure[] {\n  const pbf = vectorTileFeature._pbf;\n  pbf.pos = vectorTileFeature._geometry;\n\n  const end = pbf.readVarint() + pbf.pos;\n  let cmd = 1;\n  let length = 0;\n  let x = 0;\n  let y = 0;\n\n  const lines: FlatFigure[] = [];\n  let line: FlatFigure | undefined;\n\n  while (pbf.pos < end) {\n    if (length <= 0) {\n      const cmdLen = pbf.readVarint();\n      cmd = cmdLen & 0x7;\n      length = cmdLen >> 3;\n    }\n\n    length--;\n\n    if (cmd === 1 || cmd === 2) {\n      x += pbf.readSVarint();\n      y += pbf.readSVarint();\n\n      if (cmd === 1) {\n        // moveTo\n        if (line) lines.push(line);\n        line = [];\n      }\n\n      if (line) line.push([x, y]);\n    } else if (cmd === 7) {\n      // Workaround for https://github.com/mapbox/mapnik-vector-tile/issues/90\n      if (line) {\n        line.push(line[0].slice() as [number, number] | [number, number, number]); // closePolygon\n      }\n    } else {\n      throw new Error(`unknown command ${cmd}`);\n    }\n  }\n\n  if (line) lines.push(line);\n\n  return lines;\n}\n\n// classifies an array of rings into polygons with outer rings and holes\n\nfunction classifyRings(rings: FlatFigure[]): FlatFigure[][] {\n  const len = rings.length;\n\n  if (len <= 1) return [rings];\n\n  const polygons: FlatFigure[][] = [];\n  let polygon: FlatFigure[] | undefined;\n  let ccw: boolean | undefined;\n\n  for (let i = 0; i < len; i++) {\n    const area = signedArea(rings[i]);\n    if (area === 0) {\n      continue;\n    }\n\n    if (ccw === undefined) {\n      ccw = area < 0;\n    }\n\n    if (ccw === area < 0) {\n      if (polygon) {\n        polygons.push(polygon);\n      }\n      polygon = [rings[i]];\n    } else if (polygon) {\n      polygon.push(rings[i]);\n    }\n  }\n  if (polygon) {\n    polygons.push(polygon);\n  }\n\n  return polygons;\n}\n\nfunction signedArea(ring: FlatFigure): number {\n  let sum = 0;\n  for (let i = 0, len = ring.length, j = len - 1, p1: number[], p2: number[]; i < len; j = i++) 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