From 7a44c50f5a600e8b571ca484b89e753473b35c29 Mon Sep 17 00:00:00 2001
From: azv <azv@opencascade.com>
Date: Wed, 23 Oct 2019 10:05:10 +0300
Subject: [PATCH] Improve movement of the dimension when value is 0.

---
 .../SketchPlugin_ConstraintDistance.cpp          | 16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)

diff --git a/src/SketchPlugin/SketchPlugin_ConstraintDistance.cpp b/src/SketchPlugin/SketchPlugin_ConstraintDistance.cpp
index 47399b416..dfc755648 100644
--- a/src/SketchPlugin/SketchPlugin_ConstraintDistance.cpp
+++ b/src/SketchPlugin/SketchPlugin_ConstraintDistance.cpp
@@ -246,16 +246,16 @@ void SketchPlugin_ConstraintDistance::attributeChanged(const std::string& theID)
     } else
       return;
 
-    if (aEndPnt->distance(aStartPnt) < tolerance)
-      return;
-
     myFlyoutUpdate = true;
-    std::shared_ptr<GeomAPI_Dir2d> aLineDir(new GeomAPI_Dir2d(aEndPnt->decreased(aStartPnt)));
     std::shared_ptr<GeomAPI_XY> aFlyoutDir = aFlyoutPnt->xy()->decreased(aStartPnt);
-
-    double X = aFlyoutDir->dot(aLineDir->xy());
-    double Y = -aFlyoutDir->cross(aLineDir->xy());
-    aFlyoutAttr->setValue(X, Y);
+    if (aEndPnt->distance(aStartPnt) >= tolerance) {
+      std::shared_ptr<GeomAPI_Dir2d> aLineDir(new GeomAPI_Dir2d(aEndPnt->decreased(aStartPnt)));
+      double X = aFlyoutDir->dot(aLineDir->xy());
+      double Y = -aFlyoutDir->cross(aLineDir->xy());
+      aFlyoutAttr->setValue(X, Y);
+    }
+    else
+      aFlyoutAttr->setValue(aFlyoutDir->x(), aFlyoutDir->y());
     myFlyoutUpdate = false;
   }
 }
-- 
2.39.2