kepler.gl
Version:
kepler.gl is a webgl based application to visualize large scale location data in the browser
232 lines (185 loc) • 20.8 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", {
value: true
});
exports.h3GetResolution = undefined;
var _slicedToArray2 = require('babel-runtime/helpers/slicedToArray');
var _slicedToArray3 = _interopRequireDefault(_slicedToArray2);
exports.getVertices = getVertices;
exports.getCentroid = getCentroid;
exports.idToPolygonGeo = idToPolygonGeo;
exports.getCenterHex = getCenterHex;
exports.getH3VerticeTransform = getH3VerticeTransform;
exports.distortCylinderPositions = distortCylinderPositions;
exports.getRadius = getRadius;
exports.getAngle = getAngle;
var _h3Js = require('h3-js');
function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
exports.h3GetResolution = _h3Js.h3GetResolution;
// get vertices should return [lon, lat]
// Copyright (c) 2018 Uber Technologies, Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
function getVertices(_ref) {
var id = _ref.id;
// always reverse it
return (0, _h3Js.h3ToGeoBoundary)(id, true);
}
// get centroid should return [lon, lat]
function getCentroid(_ref2) {
var id = _ref2.id;
// always reverse it to [lng, lat]
return (0, _h3Js.h3ToGeo)(id).reverse();
}
function idToPolygonGeo(_ref3, properties) {
var object = _ref3.object;
if (!object || !object.id) {
return null;
}
var vertices = getVertices(object);
return {
geometry: {
coordinates: vertices,
type: 'LineString'
},
properties: properties
};
}
function getCenterHex(_ref4, resolution) {
var latitude = _ref4.latitude,
longitude = _ref4.longitude;
return (0, _h3Js.geoToH3)(latitude, longitude, resolution);
}
// H3 hexagon are not perfect hexagon after projection, they are slightly distorted
// Here we calculate the distortion from perfect hexagon to h3 hexagon
// A mathematica proof can be found at
// https://beta.observablehq.com/@heshan0131/h3-hexagon-shape-normalize
function getH3VerticeTransform(rawVertices, centroid) {
var vertices = revertVertices(rawVertices.map(function (vt) {
return offset(vt, centroid);
}));
var radius = getRadius(vertices[0], vertices[3]);
var angle = getAngle(vertices[0], vertices[3]);
// rotate hexagon vertices, so that v0 - v3 axis parallel with xAxis
// 2___1
// 3 / \ 0
// \___/
// 4 5
//
var rotatedVertices = vertices.map(function (vt) {
return rotate([0, 0], vt, angle);
});
// vertices of a perfect hexagon
var normalVertices = getHexagonVertices(radius);
// calculate distortion
return getDistortions(rotatedVertices, normalVertices);
}
// Vertices index based on
// https://github.com/uber/luma.gl/blob/master/modules/core/src/geometry/truncated-cone-geometry.js
function distortCylinderPositions(positions, distortions) {
var primitives = distortions.map(function (_ref5, i) {
var dr = _ref5.dr,
da = _ref5.da;
return getPtOnCircle(dr, da + Math.PI * i / 3);
});
// close it
primitives.push(primitives[0]);
// starting from the 8th vertice, repeat 4 times, only replace x(0), y(1)
return positions.map(function (v, i) {
if (i > 20 && i < 21 * 5 && i % 3 < 2) {
var row = Math.floor(i / 3);
var col = i % 3;
return primitives[row % 7][col];
}
return v;
});
}
function offset(_ref6, _ref7) {
var _ref9 = (0, _slicedToArray3.default)(_ref6, 2),
px = _ref9[0],
py = _ref9[1];
var _ref8 = (0, _slicedToArray3.default)(_ref7, 2),
x0 = _ref8[0],
y0 = _ref8[1];
return [[px - x0], [py - y0]];
}
function rotate(_ref10, _ref11, radians) {
var _ref13 = (0, _slicedToArray3.default)(_ref10, 2),
cx = _ref13[0],
cy = _ref13[1];
var _ref12 = (0, _slicedToArray3.default)(_ref11, 2),
x = _ref12[0],
y = _ref12[1];
var cos = Math.cos(radians);
var sin = Math.sin(radians);
var nx = cos * (x - cx) + sin * (y - cy) + cx;
var ny = cos * (y - cy) - sin * (x - cx) + cy;
return [nx, ny];
}
function getDistance(pt0, pt1) {
var dx = pt0[0] - pt1[0];
var dy = pt0[1] - pt1[1];
var dxy = Math.sqrt(dx * dx + dy * dy);
return dxy;
}
function getRadius(pt0, pt3) {
var dxy = getDistance(pt0, pt3);
return dxy / 2;
}
function getAngle(pt0, pt3) {
var dx = pt0[0] - pt3[0];
var dy = pt0[1] - pt3[1];
var dxy = Math.sqrt(dx * dx + dy * dy);
// Calculate angle that the perpendicular hexagon vertex axis is tilted
var angle = Math.acos(dx / dxy) * Math.sign(dy);
return angle;
}
function getPtOnCircle(radius, angle) {
return [radius * Math.cos(angle), radius * Math.sin(angle)];
}
function getHexagonVertices(r) {
var ang60 = Math.PI / 3;
var pts = [];
for (var i = 0; i < 6; i++) {
pts.push(getPtOnCircle(r, ang60 * i));
}
return pts;
}
function revertVertices(verts) {
// reverting verts from clock (h3) to counter clock wise (luma cylinder)
var seq = [0, 5, 4, 3, 2, 1];
return seq.map(function (s) {
return verts[s];
});
}
function getDistortions(vts, origs) {
// 0 and 3 should be the guide
var ct = [0, 0];
var distortions = [];
for (var i = 0; i < 6; i++) {
var vt = vts[i];
var org = origs[i];
var r = getRadius(org, ct);
var dr = getRadius(vt, ct) / r;
var da = Math.atan2(vt[1], vt[0]) - Math.atan2(org[1], org[0]);
distortions.push({ dr: dr, da: da });
}
return distortions;
}
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Copyright (c) 2018 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 {h3GetResolution, h3ToGeo, h3ToGeoBoundary, geoToH3} from 'h3-js';\nexport {h3GetResolution};\n\n// get vertices should return [lon, lat]\nexport function getVertices({id}) {\n  // always reverse it\n  return h3ToGeoBoundary(id, true);\n}\n\n// get centroid should return [lon, lat]\nexport function getCentroid({id}) {\n  // always reverse it to [lng, lat]\n  return h3ToGeo(id).reverse();\n}\n\nexport function idToPolygonGeo({object}, properties) {\n  if (!object || !object.id) {\n    return null;\n  }\n\n  const vertices = getVertices(object);\n\n  return {\n    geometry: {\n      coordinates: vertices,\n      type: 'LineString'\n    },\n    properties\n  };\n}\n\nexport function getCenterHex({latitude, longitude}, resolution) {\n  return geoToH3(latitude, longitude, resolution);\n}\n\n// H3 hexagon are not perfect hexagon after projection, they are slightly distorted\n// Here we calculate the distortion from perfect hexagon to h3 hexagon\n// A mathematica proof can be found at\n// https://beta.observablehq.com/@heshan0131/h3-hexagon-shape-normalize\nexport function getH3VerticeTransform(rawVertices, centroid) {\n  const vertices = revertVertices(rawVertices.map(vt => offset(vt, centroid)));\n  const radius = getRadius(vertices[0], vertices[3]);\n\n  const angle = getAngle(vertices[0], vertices[3])\n\n  // rotate hexagon vertices, so that v0 - v3 axis parallel with xAxis\n  //   2___1\n  // 3 /   \\ 0\n  //   \\___/\n  //   4   5\n  //\n  const rotatedVertices = vertices.map(vt => rotate([0, 0], vt, angle));\n\n  // vertices of a perfect hexagon\n  const normalVertices = getHexagonVertices(radius);\n\n  // calculate distortion\n  return getDistortions(rotatedVertices, normalVertices)\n}\n\n// Vertices index based on\n// https://github.com/uber/luma.gl/blob/master/modules/core/src/geometry/truncated-cone-geometry.js\nexport function distortCylinderPositions(positions, distortions) {\n\n  const primitives = distortions.map(({dr, da}, i) =>\n    getPtOnCircle(dr, da + Math.PI * i / 3));\n  // close it\n  primitives.push(primitives[0]);\n\n  // starting from the 8th vertice, repeat 4 times, only replace x(0), y(1)\n  return positions.map((v, i) => {\n    if (i > 20 && i < 21 * 5 && i % 3 < 2) {\n      const row = Math.floor(i / 3);\n      const col = i % 3;\n      return primitives[row % 7][col];\n    }\n    return v;\n  });\n}\n\nfunction offset([px, py], [x0, y0]) {\n  return [[px - x0], [py - y0]];\n}\n\nfunction rotate([cx, cy], [x, y], radians) {\n  const cos = Math.cos(radians);\n  const sin = Math.sin(radians);\n  const nx = (cos * (x - cx)) + (sin * (y - cy)) + cx;\n  const ny = (cos * (y - cy)) - (sin * (x - cx)) + cy;\n\n  return [nx, ny];\n}\n\nfunction getDistance(pt0, pt1) {\n  const dx = pt0[0] - pt1[0];\n  const dy = pt0[1] - pt1[1];\n  const dxy = Math.sqrt(dx * dx + dy * dy);\n  return dxy;\n}\n\nexport function getRadius(pt0, pt3) {\n  const dxy = getDistance(pt0, pt3);\n  return dxy / 2;\n}\n\nexport function getAngle(pt0, pt3) {\n  const dx = pt0[0] - pt3[0];\n  const dy = pt0[1] - pt3[1];\n  const dxy = Math.sqrt(dx * dx + dy * dy);\n\n  // Calculate angle that the perpendicular hexagon vertex axis is tilted\n  const angle = Math.acos(dx / dxy) * Math.sign(dy);\n  return angle;\n}\n\nfunction getPtOnCircle(radius, angle) {\n  return [radius *  Math.cos(angle), radius *  Math.sin(angle)];\n}\n\nfunction getHexagonVertices(r) {\n  const ang60 = Math.PI / 3;\n  const pts = []\n  for (let i = 0; i < 6; i++) {\n    pts.push(getPtOnCircle(r, ang60 * i))\n  }\n\n  return pts;\n}\n\nfunction revertVertices(verts) {\n  // reverting verts from clock (h3) to counter clock wise (luma cylinder)\n  const seq = [0, 5, 4, 3, 2, 1];\n  return seq.map(s => verts[s]);\n}\n\nfunction getDistortions(vts, origs) {\n  // 0 and 3 should be the guide\n  const ct = [0, 0];\n  const distortions = [];\n\n  for (let i = 0; i < 6; i++) {\n    const vt = vts[i];\n    const org = origs[i];\n\n    const r = getRadius(org, ct);\n    const dr = getRadius(vt, ct) / r\n\n    const da = Math.atan2(vt[1], vt[0]) - Math.atan2(org[1], org[0]);\n\n    distortions.push({dr, da});\n  }\n\n  return distortions;\n}\n"]}