fix: bbox not working with MultiPolygon.

Author: willvincent

src/Packages/Bbox.php

@@ -54,11 +54,18 @@ public function __invoke(
                 $minY = min($minY, $y);
                 $maxX = max($maxX, $x);
                 $maxY = max($maxY, $y);
+            } elseif ($geometry instanceof MultiPolygon) {
+                foreach ($geometry->getCoordinates() as $polygon) {
+                    foreach ($polygon as $ring) {
+                        foreach ($ring as $point) {
+                            $updateBBox(new Point($point));
+                        }
+                    }
+                }
             } elseif ($geometry instanceof MultiPoint ||
                 $geometry instanceof LineString ||
                 $geometry instanceof MultiLineString ||
-                $geometry instanceof Polygon ||
-                $geometry instanceof MultiPolygon) {
+                $geometry instanceof Polygon) {
                 foreach ($geometry->getCoordinates() as $coord) {
                     if (is_array($coord[0])) {
                         foreach ($coord as $point) {

tests/BboxTest.php

@@ -5,6 +5,7 @@
 use GeoJson\Feature\Feature;
 use GeoJson\GeoJson;
 use GeoJson\Geometry\LineString;
+use GeoJson\Geometry\MultiPolygon;
 use GeoJson\Geometry\Point;
 use GeoJson\Geometry\Polygon;
 use PHPUnit\Framework\TestCase;
@@ -70,4 +71,35 @@ public function test_recompute_bbox(): void
         $bbox = Turf::bbox($feature, true);
         $this->assertEquals([10, 20, 10, 20], $bbox, 'Should recompute BBox when recompute is true');
     }
+
+    public function test_bbox_multipolygon(): void
+    {
+        $multiPolygon = new MultiPolygon([
+            [
+                [[0, 0], [1, 0], [1, 1], [0, 1], [0, 0]],
+            ],
+            [
+                [[2, 2], [4, 2], [4, 4], [2, 4], [2, 2]],
+            ],
+        ]);
+
+        $bbox = Turf::bbox($multiPolygon);
+        $this->assertEquals([0, 0, 4, 4], $bbox, 'MultiPolygon BBox should encompass all polygons');
+    }
+
+    public function test_bbox_multipolygon_with_holes(): void
+    {
+        $multiPolygon = new MultiPolygon([
+            [
+                [[0, 0], [3, 0], [3, 3], [0, 3], [0, 0]],
+                [[1, 1], [2, 1], [2, 2], [1, 2], [1, 1]],
+            ],
+            [
+                [[5, 5], [7, 5], [7, 7], [5, 7], [5, 5]],
+            ],
+        ]);
+
+        $bbox = Turf::bbox($multiPolygon);
+        $this->assertEquals([0, 0, 7, 7], $bbox, 'MultiPolygon BBox with holes should encompass all rings');
+    }
 }