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<!DOCTYPE html><html lang="en" style="font-size:16px"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width,initial-scale=1"><link rel="icon" href="../favicon.ico"><title>Source: geojson.js</title><!--[if lt IE 9]>
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aria-label="change-font-size"><svg><use xlink:href="#font-size-icon"></use></svg></button></div></div><nav></nav></nav></div><div class="toc-container"><div class="toc-content"><span class="bold">On this page</span><div id="eed4d2a0bfd64539bb9df78095dec881"></div></div></div><div class="body-wrapper"><div class="main-content"><div class="main-wrapper"><section id="source-page" class="source-page"><header><h1 id="title" class="has-anchor">geojson.js</h1></header><article><pre class="prettyprint source lang-js"><code>import * as gis from './gis.js'
// /** @exports */
/** @module */
export function isGeojson(obj) {
return typeof obj === 'object' && obj.type === 'FeatureCollection'
}
// Return deep copy of the given json file.
export function clone(json) {
return JSON.parse(JSON.stringify(json))
}
export function minify(json) {
if (typeof json === 'string') json = JSON.parse(json)
const str = JSON.stringify(json) // compact form
// newline for each feature
return str.replace(/},{/g, '},\n\n{')
}
// ========== features
export function bboxFeature(bbox, properties = {}) {
const coords = gis.bboxCoords(bbox)
coords.push(coords[0]) // polys are closed, repeat first coord
return {
type: 'Feature',
geometry: {
cordinates: coords,
type: 'Polygon',
},
properties,
}
}
/**
* Flatten MultiLineStrings to single LineStrings features.
* @param {FeatureCollection|Array<Features>} geojson a FeatureCollection or Features array
* @returns Features array
*/
export function flattenMultiLineStrings(geojson, cloneJson = true) {
if (cloneJson) geojson = clone(geojson)
const features = geojson.features || geojson
const lineStrings = features.reduce((acc, obj) => {
const geom = obj.geometry
if (geom.type === 'LineString') {
geom.coordinates.properties = obj.properties
acc.push(geom.coordinates)
} else if (geom.type === 'MultiLineString') {
geom.coordinates.forEach(a => {
a.properties = obj.properties
acc.push(a)
})
}
return acc
}, [])
return lineStrings
}
// Convert LineStrings to Links.
// Input can be a FeatureCollection or a Features array
// Return an array of new Turtles & Links
/**
* @param {Model} model Instance of Model
* @param {Array<number>} bbox [west, south, east, north] Gis BBox
* @param {FeatureCollection|Array<Features>} lineStrings geojson features
* @returns {Turtles|Links} Return an array of new Turtles & Links
*/
export function lineStringsToLinks(model, bbox, lineStrings) {
// const xfm = xfmFromBBox(model, bbox)
const xfm = model.world.xfm || model.world.bboxTransform(...bbox)
lineStrings = flattenMultiLineStrings(lineStrings)
const nodeCache = {}
const newTurtles = []
const newLinks = []
function getNode(pt) {
const key = pt.toString()
let node = nodeCache[key]
if (node) return node
node = model.turtles.createOne(t => {
// t.setxy(...model.world.toWorld(...pt))
t.setxy(...xfm.toWorld(pt))
t.lon = pt[0]
t.lat = pt[1]
})
nodeCache[key] = node
newTurtles.push(node)
return node
}
function newLink(pt0, pt1) {
const t0 = getNode(pt0)
const t1 = getNode(pt1)
const link = model.links.createOne(t0, t1)
newLinks.push(link)
return link
}
function lineStringToLinks(lineString) {
lineString.reduce((acc, pt, i, a) => {
const link = newLink(a[i - 1], pt)
if (i === 1) {
acc = [link]
acc.properties = lineString.properties
} else {
acc.push(link)
}
link.lineString = acc
return acc
})
}
lineStrings.forEach(lineString => lineStringToLinks(lineString))
return [newTurtles, newLinks]
}
// https://github.com/tmcw/geojson-flatten
export function flatten(gj, cloneJson = true) {
if (cloneJson) gj = clone(gj)
switch ((gj && gj.type) || null) {
case 'FeatureCollection':
gj.features = gj.features.reduce(function (mem, feature) {
return mem.concat(flatten(feature))
}, [])
return gj
case 'Feature':
if (!gj.geometry) return [gj]
return flatten(gj.geometry).map(function (geom) {
var data = {
type: 'Feature',
properties: JSON.parse(JSON.stringify(gj.properties)),
geometry: geom,
}
if (gj.id !== undefined) {
data.id = gj.id
}
return data
})
case 'MultiPoint':
return gj.coordinates.map(function (_) {
return { type: 'Point', coordinates: _ }
})
case 'MultiPolygon':
return gj.coordinates.map(function (_) {
return { type: 'Polygon', coordinates: _ }
})
case 'MultiLineString':
return gj.coordinates.map(function (_) {
return { type: 'LineString', coordinates: _ }
})
case 'GeometryCollection':
return gj.geometries.map(flatten).reduce(function (memo, geoms) {
return memo.concat(geoms)
}, [])
case 'Point':
case 'Polygon':
case 'LineString':
return [gj]
}
}
// https://github.com/geosquare/geojson-bbox
export function geojsonBBox(gj) {
var coords, bbox
if (!gj.hasOwnProperty('type')) return
coords = getCoordinates(gj)
bbox = [
Number.POSITIVE_INFINITY,
Number.POSITIVE_INFINITY,
Number.NEGATIVE_INFINITY,
Number.NEGATIVE_INFINITY,
]
return coords.reduce(function (prev, coord) {
return [
Math.min(coord[0], prev[0]),
Math.min(coord[1], prev[1]),
Math.max(coord[0], prev[2]),
Math.max(coord[1], prev[3]),
]
}, bbox)
}
export function getCoordinates(gj) {
switch (gj.type) {
case 'Point':
return [gj.coordinates]
case 'LineString':
case 'MultiPoint':
return gj.coordinates
case 'Polygon':
case 'MultiLineString':
return gj.coordinates.reduce(function (dump, part) {
return dump.concat(part)
}, [])
case 'MultiPolygon':
return gj.coordinates.reduce(function (dump, poly) {
return dump.concat(
poly.reduce(function (points, part) {
return points.concat(part)
}, [])
)
}, [])
case 'Feature':
return getCoordinates(gj.geometry)
case 'GeometryCollection':
return gj.geometries.reduce(function (dump, g) {
return dump.concat(getCoordinates(g))
}, [])
case 'FeatureCollection':
return gj.features.reduce(function (dump, f) {
return dump.concat(getCoordinates(f))
}, [])
}
}
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