From f6f43b6fe4e8a1621d7b4cc767b89be2b9675369 Mon Sep 17 00:00:00 2001
From: j <77419450+emmanuelobrien@users.noreply.github.com>
Date: Wed, 3 Feb 2021 15:12:40 +0100
Subject: [PATCH] Sketcher: Constraint documentation

---
 src/Mod/Sketcher/App/Constraint.h | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/src/Mod/Sketcher/App/Constraint.h b/src/Mod/Sketcher/App/Constraint.h
index 7a3316b08a..6e526030cc 100644
--- a/src/Mod/Sketcher/App/Constraint.h
+++ b/src/Mod/Sketcher/App/Constraint.h
@@ -75,7 +75,13 @@ enum InternalAlignmentType {
     BSplineKnotPoint        = 10,
 };
 
-/// define if you want to use the end or start point
+/*! PointPos lets us refer to different aspects of a piece of geometry.  sketcher::none refers
+ * to an edge itself (eg., for a Perpendicular constraint on two lines). sketcher::start and
+ * sketcher::end denote the endpoints of lines or bounded curves.  sketcher::mid denotes
+ * geometries with geometrical centers (eg., circle, ellipse). Bare points use 'start'.  More
+ * complex geometries like parabola focus or b-spline knots use InternalAlignment constraints
+ * in addition to PointPos.
+ */
 enum PointPos { none, start, end, mid };
 
 class SketcherExport Constraint : public Base::Persistence