Fixes bug in relation area processing

encode.js

@@ -189,6 +189,7 @@ module.exports = function (item, deps) {
             ppositions = []
             holes = []
             ref0 = -1
+            closed = false
           }
           if (!deps[smembers[i].id]) continue
           var member = deps[smembers[i].id]

package.json

@@ -7,7 +7,7 @@
     "example": "example"
   },
   "scripts": {
-    "test": "echo \"Error: no test specified\" && exit 1",
+    "test": "tape test/*.js",
     "get-data": "wget https://kitties.neocities.org/tmp/alexandria.pbf -O ./example/alexandria.pbf",
     "encode-example": "node ./example/encode.js ./example/alexandria.pbf",
     "decode-example": "node ./example/decode.js"

test/multipolygon.js

@@ -0,0 +1,122 @@
+var decode = require('../decode')
+var encode = require('../encode')
+var test = require('tape')
+
+// this multipolygon includes two non-overlapping polygon
+// geometries and its dependencies. the test ensures that the
+// two polygons are represented by the appropriate number of
+// cells in the decoded form. 6 cell entries for the 2 polygons
+
+var itemTwoClosedPoly = {
+  id: 0,
+  type: 'relation',
+  tags: {
+    type: 'multipolygon',
+  },
+  members: [{
+    type: 'way',
+    id: 100,
+    role: 'outer'
+  }, {
+    type: 'way',
+    id: 101,
+    role: 'outer'
+  }, {
+    type: 'way',
+    id: 102,
+    role: 'outer'
+  }, {
+    type: 'way',
+    id: 103,
+    role: 'outer'
+  }]
+}
+
+var itemOneClosedPoly = {
+  id: 1,
+  type: 'relation',
+  tags: {
+    type: 'multipolygon',
+  },
+  members: [{
+    type: 'way',
+    id: 100,
+    role: 'outer'
+  }, {
+    type: 'way',
+    id: 101,
+    role: 'outer'
+  }]
+}
+
+var deps = {
+  100: {
+    id: 100,
+    type: 'way',
+    refs: [200, 201, 202],
+  },
+  101: {
+    id: 2,
+    type: 'way',
+    refs: [202, 203, 200],
+  },
+  102: {
+    id: 3,
+    type: 'way',
+    refs: [210, 211, 212],
+  },
+  103: {
+    id: 4,
+    type: 'way',
+    refs: [212, 213, 210],
+  },
+  200: {
+    type: 'node',
+    lon: 10,
+    lat: 10,
+  },
+  201: {
+    type: 'node',
+    lon: 20,
+    lat: 20,
+  },
+  202: {
+    type: 'node',
+    lon: 10,
+    lat: 20,
+  },
+  203: {
+    type: 'node',
+    lon: 0,
+    lat: 20,
+  },
+  210: {
+    type: 'node',
+    lon: -10,
+    lat: -10,
+  },
+  211: {
+    type: 'node',
+    lon: -20,
+    lat: -20,
+  },
+  212: {
+    type: 'node',
+    lon: -10,
+    lat: -20,
+  },
+  213: {
+    type: 'node',
+    lon: 0,
+    lat: -20,
+  }
+}
+
+test('multipolygon', function (t) {
+  t.plan(2)
+
+  var decodedTwoPoly = decode([encode(itemTwoClosedPoly, deps)])
+  t.assert(Object.keys(decodedTwoPoly.area.cells).length === 6)
+  var decodedOnePoly = decode([encode(itemOneClosedPoly, deps)])
+  t.assert(Object.keys(decodedOnePoly.area.cells).length === 3)
+})