@turf/boolean-contains - support for multipolygon inside polygon (#2357)

* add tests for multipolygon contained by polygon
* check for is every multipolygon inside polygon

---------

Co-authored-by: Martin Powlesland-Cook <mpowlesland-cook@denseair.net>
Co-authored-by: James Beard <james@smallsaucepan.com>

Author: 3 people

packages/turf-boolean-contains/index.ts

@@ -80,6 +80,8 @@ function booleanContains(
           return isPolyInPoly(geom1, geom2);
         case "MultiPoint":
           return isMultiPointInPoly(geom1, geom2);
+        case "MultiPolygon":
+          return isMultiPolyInPoly(geom1, geom2);
         default:
           throw new Error("feature2 " + type2 + " geometry not supported");
       }
@@ -101,6 +103,12 @@ function isPolygonInMultiPolygon(multiPolygon: MultiPolygon, polygon: Polygon) {
   );
 }
 
+function isMultiPolyInPoly(polygon: Polygon, multiPolygon: MultiPolygon) {
+  return multiPolygon.coordinates.every((coords) =>
+    isPolyInPoly(polygon, { type: "Polygon", coordinates: coords })
+  );
+}
+
 function isPointInMultiPoint(multiPoint: MultiPoint, pt: Point) {
   let i;
   let output = false;
@@ -321,6 +329,7 @@ export {
   isLineOnLine,
   isLineInPoly,
   isPolyInPoly,
+  isMultiPolyInPoly,
   doBBoxOverlap,
   compareCoords,
   getMidpoint,

packages/turf-boolean-contains/test/false/MultiPolygon/Polygon/MultiPolygonIsNotContainedByPolygon.geojson

@@ -0,0 +1,48 @@
+{
+  "type": "FeatureCollection",
+  "features": [
+    {
+      "type": "Feature",
+      "properties": {},
+      "geometry": {
+        "type": "Polygon",
+        "coordinates": [
+          [
+            [5.697231218450497, 39.505906288651715],
+            [5.697231218450497, 40.50986523812119],
+            [4.30801420435526, 40.50986523812119],
+            [4.30801420435526, 39.505906288651715],
+            [5.697231218450497, 39.505906288651715]
+          ]
+        ]
+      }
+    },
+    {
+      "type": "Feature",
+      "properties": null,
+      "geometry": {
+        "type": "MultiPolygon",
+        "coordinates": [
+          [
+            [
+              [3.6968994140625, 39.65645604812829],
+              [4.622497558593749, 39.65645604812829],
+              [4.622497558593749, 40.168380093142446],
+              [3.6968994140625, 40.168380093142446],
+              [3.6968994140625, 39.65645604812829]
+            ]
+          ],
+          [
+            [
+              [4.73236083984375, 39.69450749856091],
+              [5.416259765624999, 39.69450749856091],
+              [5.416259765624999, 40.386304853509046],
+              [4.73236083984375, 40.386304853509046],
+              [4.73236083984375, 39.69450749856091]
+            ]
+          ]
+        ]
+      }
+    }
+  ]
+}

packages/turf-boolean-contains/test/true/MultiPolygon/Polygon/MultiPolygonIsContainedByPolygon.geojson

@@ -0,0 +1,48 @@
+{
+  "type": "FeatureCollection",
+  "features": [
+    {
+      "type": "Feature",
+      "properties": {},
+      "geometry": {
+        "type": "Polygon",
+        "coordinates": [
+          [
+            [5.860668514226688, 40.60423664824944],
+            [3.248940527728166, 40.60423664824944],
+            [3.248940527728166, 39.35441976583036],
+            [5.860668514226688, 39.35441976583036],
+            [5.860668514226688, 40.60423664824944]
+          ]
+        ]
+      }
+    },
+    {
+      "type": "Feature",
+      "properties": null,
+      "geometry": {
+        "type": "MultiPolygon",
+        "coordinates": [
+          [
+            [
+              [3.6968994140625, 39.65645604812829],
+              [4.622497558593749, 39.65645604812829],
+              [4.622497558593749, 40.168380093142446],
+              [3.6968994140625, 40.168380093142446],
+              [3.6968994140625, 39.65645604812829]
+            ]
+          ],
+          [
+            [
+              [4.73236083984375, 39.69450749856091],
+              [5.416259765624999, 39.69450749856091],
+              [5.416259765624999, 40.386304853509046],
+              [4.73236083984375, 40.386304853509046],
+              [4.73236083984375, 39.69450749856091]
+            ]
+          ]
+        ]
+      }
+    }
+  ]
+}