engage

.gitignore

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+node_modules

.travis.yml

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+language: node_js
+
+node_js:
+  - '0.12'
+  - 'iojs'
+sudo: false
+cache:
+  directories:
+    - node_modules
+
+script:
+  - npm test

CHANGELOG.md

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+# esri-extent change log
+All notable changes to this project will be documented in this file.
+This project adheres to [Semantic Versioning](http://semver.org/).
+
+## 1.0.0
+* engage

LICENSE.md

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+Copyright (c) 2015, Nate Goldman <[email protected]>
+
+Permission to use, copy, modify, and/or distribute this software for any
+purpose with or without fee is hereby granted, provided that the above
+copyright notice and this permission notice appear in all copies.
+
+THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

README.md

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+# esri-extent
+
+[![](https://img.shields.io/npm/v/esri-extent.svg?style=flat-square)](https://www.npmjs.com/package/esri-extent)
+[![](https://img.shields.io/travis/ngoldman/esri-extent.svg?style=flat-square)](https://travis-ci.org/ngoldman/esri-extent)
+
+Get the Esri-formatted extent of a GeoJSON feature collection.
+
+```
+npm install esri-extent
+```
+
+## Usage
+
+```js
+var esriExtent = require('esri-extent')
+var example = require('./test/geojson-spec-example.json')
+
+var extent = esriExtent(example)
+
+// OR
+
+esriExtent(example, function (err, extent) {
+  if (err) throw err
+
+  console.log(extent)
+  // {
+  //   xmin: 100,
+  //   ymin: 0,
+  //   xmax: 105,
+  //   ymax: 1,
+  //   spatialReference: {
+  //     wkid: 4326,
+  //     latestWkid: 4326
+  //   }
+  // }
+})
+```
+
+## License
+
+[ISC](LICENSE.md)

index.js

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+var bbox2extent = require('bbox2extent')
+var bbox = [Infinity, Infinity, -Infinity, -Infinity]
+
+module.exports = function (collection, callback) {
+  // fallback if features passed directly
+  var features = collection.features ? collection.features : collection
+
+  features.forEach(function (f, i) {
+    if (!f.geometry) return
+
+    var isPoint = f.geometry.type === 'Point'
+    var isLine = f.geometry.type === 'LineString'
+    var isMultiLine = f.geometry.type === 'MultiLineString'
+    var isPolygon = f.geometry.type === 'Polygon'
+    var isMultiPolygon = f.geometry.type === 'MultiPolygon'
+    var coords = f.geometry.coordinates
+
+    if (isPoint) extend(bbox, coords)
+
+    if (isLine || isMultiLine) {
+      if (isMultiLine) coords = coords[0]
+      coords.forEach(function (c, j) {
+        extend(bbox, c)
+      })
+    }
+
+    if (isPolygon || isMultiPolygon) {
+      coords = isMultiPolygon ? coords[0][0] : coords[0]
+      coords.forEach(function (c, j) {
+        extend(bbox, c)
+      })
+    }
+  })
+
+  var extent = bbox2extent(bbox)
+
+  if (callback) callback(null, extent)
+  else return extent
+}
+
+function extend (bbox, coord) {
+  bbox[0] = Math.min(bbox[0], coord[0])
+  bbox[1] = Math.min(bbox[1], coord[1])
+  bbox[2] = Math.max(bbox[2], coord[0])
+  bbox[3] = Math.max(bbox[3], coord[1])
+}

package.json

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+{
+  "name": "esri-extent",
+  "description": "Get the Esri-formatted extent of a GeoJSON feature collection.",
+  "version": "1.0.0",
+  "author": "Nate Goldman <[email protected]>",
+  "bugs": {
+    "url": "https://github.com/ngoldman/esri-extent/issues"
+  },
+  "devDependencies": {
+    "standard": "^3.2.0",
+    "tap-spec": "^2.2.2",
+    "tape": "^3.5.0"
+  },
+  "homepage": "https://github.com/ngoldman/esri-extent",
+  "keywords": [
+    "bounding",
+    "box",
+    "collection",
+    "esri",
+    "extent",
+    "feature",
+    "geojson"
+  ],
+  "license": "ISC",
+  "main": "index.js",
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/ngoldman/esri-extent.git"
+  },
+  "scripts": {
+    "test": "standard && node test | tap-spec"
+  },
+  "dependencies": {
+    "bbox2extent": "^1.0.1"
+  }
+}

test/geojson-spec-example.json

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+
+{
+  "type": "FeatureCollection",
+  "features": [
+    {
+      "type": "Feature",
+      "geometry": {
+        "type": "Point",
+        "coordinates": [
+          102.0,
+          0.5
+        ]
+      },
+      "properties": {
+        "prop0": "value0"
+      }
+    },
+    {
+      "type": "Feature",
+      "geometry": {
+        "type": "LineString",
+        "coordinates": [
+          [
+            102.0,
+            0.0
+          ],
+          [
+            103.0,
+            1.0
+          ],
+          [
+            104.0,
+            0.0
+          ],
+          [
+            105.0,
+            1.0
+          ]
+        ]
+      },
+      "properties": {
+        "prop0": "value0",
+        "prop1": 0.0
+      }
+    },
+    {
+      "type": "Feature",
+      "geometry": {
+        "type": "Polygon",
+        "coordinates": [
+          [
+            [
+              100.0,
+              0.0
+            ],
+            [
+              101.0,
+              0.0
+            ],
+            [
+              101.0,
+              1.0
+            ],
+            [
+              100.0,
+              1.0
+            ],
+            [
+              100.0,
+              0.0
+            ]
+          ]
+        ]
+      },
+      "properties": {
+        "prop0": "value0",
+        "prop1": {
+          "this": "that"
+        }
+      }
+    }
+  ]
+}

test/index.js

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+var esriExtent = require('..')
+var example = require('./geojson-spec-example.json')
+var test = require('tape')
+var expected = {
+  xmin: 100,
+  ymin: 0,
+  xmax: 105,
+  ymax: 1,
+  spatialReference: {
+    wkid: 4326,
+    latestWkid: 4326
+  }
+}
+
+test('get correct extent from geojson spec example', function (t) {
+  esriExtent(example, function (err, extent) {
+    if (err) throw err
+
+    t.deepEqual(extent, expected)
+    t.end()
+  })
+})