Bugfix PolylineZ with multiple features

abrman · Nov 12, 2024 · c8ce01c · c8ce01c
1 parent ae33d67
commit c8ce01c
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diff --git a/.changeset/proud-donuts-suffer.md b/.changeset/proud-donuts-suffer.md
@@ -0,0 +1,5 @@
+---
+"shp-kit": patch
+---
+
+PolylineZ with multiple features now exports correctly
diff --git a/src/private/writers/PolyLine.ts b/src/private/writers/PolyLine.ts
@@ -31,8 +31,8 @@ const shpLength = (
   const file_header_length_bytes = 100;
   const records_header_length_bytes = features.length * 8;
   let polyline_record_length_bytes = 44 * features.length + parts * 4 + coordinates.length * 16;
-  if (typeString === "PolyLineM") polyline_record_length_bytes += 16 + coordinates.length * 8;
-  if (typeString === "PolyLineZ") polyline_record_length_bytes += 32 + coordinates.length * 16;
+  if (typeString === "PolyLineM") polyline_record_length_bytes += features.length * 16 + coordinates.length * 8;
+  if (typeString === "PolyLineZ") polyline_record_length_bytes += features.length * 32 + coordinates.length * 16;
   return file_header_length_bytes + records_header_length_bytes + polyline_record_length_bytes;
 };