Add an endType parameter to CrossSection::Offset

bindings/c/conv.cpp

@@ -200,6 +200,27 @@ CrossSection::JoinType from_c(ManifoldJoinType join_type) {
   return jt;
 }
 
+CrossSection::EndType from_c(ManifoldEndType end_type) {
+  auto et = CrossSection::EndType::Polygon;
+  switch (end_type) {
+    case MANIFOLD_END_TYPE_POLYGON:
+      break;
+    case MANIFOLD_END_TYPE_JOINED:
+      et = CrossSection::EndType::Joined;
+      break;
+    case MANIFOLD_END_TYPE_BUTT:
+      et = CrossSection::EndType::Butt;
+      break;
+    case MANIFOLD_END_TYPE_SQUARE:
+      et = CrossSection::EndType::Square;
+      break;
+    case MANIFOLD_END_TYPE_ROUND:
+      et = CrossSection::EndType::Round;
+      break;
+  };
+  return et;
+}
+
 const manifold::Box *from_c(ManifoldBox *m) {
   return reinterpret_cast<manifold::Box const *>(m);
 }

bindings/c/cross.cpp

@@ -203,9 +203,9 @@ ManifoldCrossSection *manifold_cross_section_simplify(void *mem,
 
 ManifoldCrossSection *manifold_cross_section_offset(
     void *mem, ManifoldCrossSection *cs, double delta, ManifoldJoinType jt,
-    double miter_limit, int circular_segments) {
-  auto offset =
-      from_c(cs)->Offset(delta, from_c(jt), miter_limit, circular_segments);
+    ManifoldEndType et, double miter_limit, int circular_segments) {
+  auto offset = from_c(cs)->Offset(delta, from_c(jt), from_c(et), miter_limit,
+                                   circular_segments);
   return to_c(new (mem) CrossSection(offset));
 }
 

bindings/c/include/manifold/types.h

@@ -103,3 +103,11 @@ typedef enum ManifoldJoinType {
   MANIFOLD_JOIN_TYPE_ROUND,
   MANIFOLD_JOIN_TYPE_MITER,
 } ManifoldJoinType;
+
+typedef enum ManifoldEndType {
+  MANIFOLD_END_TYPE_POLYGON,
+  MANIFOLD_END_TYPE_JOINED,
+  MANIFOLD_END_TYPE_BUTT,
+  MANIFOLD_END_TYPE_SQUARE,
+  MANIFOLD_END_TYPE_ROUND,
+} ManifoldEndType;