Fix stroke() for 1 point paths.

shapes2d.scad

@@ -114,7 +114,10 @@ module stroke(
     ) * linewidth;
 
     assert(is_bool(closed));
+    assert(is_list(path));
+    if (len(path) > 1) {
         assert(is_path(path,[2,3]), "The path argument must be a list of 2D or 3D points.");
+    }
     path = deduplicate( closed? close_path(path) : path );
 
     assert(is_num(width) || (is_vector(width) && len(width)==len(path)));
@@ -164,6 +167,13 @@ module stroke(
     ]);
     assert(is_num(trim2));
 
+    if (len(path) == 1) {
+        if (len(path[0]) == 2) {
+            translate(path[0]) circle(d=width[0]);
+        } else {
+            translate(path[0]) sphere(d=width[0]);
+        }
+    } else if (len(path[0]) == 2) {
         spos = path_pos_from_start(path,trim1,closed=false);
         epos = path_pos_from_end(path,trim2,closed=false);
         path2 = path_subselect(path, spos[0], spos[1], epos[0], epos[1]);
@@ -175,7 +185,6 @@ module stroke(
 
         start_vec = select(path,0) - select(path,1);
         end_vec = select(path,-1) - select(path,-2);
-    if (len(path[0]) == 2) {
         // Straight segments
         for (i = idx(path2,end=-2)) {
             seg = select(path2,i,i+1);

version.scad

@@ -8,7 +8,7 @@
 //////////////////////////////////////////////////////////////////////
 
 
-BOSL_VERSION = [2,0,332];
+BOSL_VERSION = [2,0,333];
 
 
 // Section: BOSL Library Version Functions