No commit message

geometryspec.md

@@ -149,17 +149,17 @@ Shapes mandatory for the P\&S router:
   - **class SHAPE** : abstract interface for all **SHAPE\_** classes.
   - **class SHAPE\_RECT**: axis-aligned rectangle
   - **class SHAPE\_CIRCLE**: full circle 
-  - **class SHAPE\_LINE\_STRING**: string of line segments (a polyline,
-    with optional thickness)
+  - **class SHAPE\_LINE\_CHAIN (\_POLYLINE)**: string of line segments
+    (zero-width polyline). Polygon outline is of type
+    SHAPE\_LINE\_CHAIN.
 
 More complex shapes (for DRC):
 
   - **class SHAPE\_ORIENTED\_RECT**: rectangle with rotation
-  - **class SHAPE\_POLYGON**: polygon with holes. Cleaned-up version of
-    CPolyLine.
-  - **class SHAPE\_ARC**: circular arc (with optional thickness)
-  - \*class SHAPE\_BEZIER: quadratic bezier curve (with optional
-    thickness)
+  - **class SHAPE\_POLYGON**: polygon with holes. Outline/hole edges are
+    stored as SHAPE\_LINE\_CHAINs
+  - **class SHAPE\_ARC**: circular arc (zero-width)
+  - **class SHAPE\_BEZIER**: quadratic bezier curve (zero-width) 
 
 ### Shape groups and indexes
 
@@ -168,7 +168,7 @@ More complex shapes (for DRC):
     with respect to the group origin.
   - class SHAPE\_INDEX: class for spatial indexing of shapes. Internally
     implements an R/R\*/Bounding Volume/Bounding Interval Tree. Provides
-    fast distance/collision query operator.
+    fast distance/collision query method.
 
 ## Implementation