From 0f00c6d2d1c39215f8d0e5c2aff5ddcff5186906 Mon Sep 17 00:00:00 2001
From: PaddleStroke <pierrelouis.boyer@gmail.com>
Date: Sat, 22 Mar 2025 18:21:24 +0100
Subject: [PATCH] Sketcher: Slot tool: Enforce correctly when angle is set
 (#20269)

---
 src/Mod/Sketcher/Gui/DrawSketchHandlerSlot.h | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

diff --git a/src/Mod/Sketcher/Gui/DrawSketchHandlerSlot.h b/src/Mod/Sketcher/Gui/DrawSketchHandlerSlot.h
index 31f0dc096b..1108aa244e 100644
--- a/src/Mod/Sketcher/Gui/DrawSketchHandlerSlot.h
+++ b/src/Mod/Sketcher/Gui/DrawSketchHandlerSlot.h
@@ -410,8 +410,9 @@ void DSHSlotControllerBase::doEnforceControlParameters(Base::Vector2d& onSketchP
             if (onViewParameters[OnViewParameter::Fourth]->isSet) {
                 double angle =
                     Base::toRadians(onViewParameters[OnViewParameter::Fourth]->getValue());
-                onSketchPos.x = handler->startPoint.x + cos(angle) * length;
-                onSketchPos.y = handler->startPoint.y + sin(angle) * length;
+                Base::Vector2d ovpDir(cos(angle), sin(angle));
+                onSketchPos.ProjectToLine(onSketchPos - handler->startPoint, ovpDir);
+                onSketchPos += handler->startPoint;
             }
         } break;
         case SelectMode::SeekThird: {
@@ -468,6 +469,16 @@ void DSHSlotController::adaptParameters(Base::Vector2d onSketchPos)
                                         Base::toDegrees(range),
                                         Base::Unit::Angle);
             }
+            else if (vec.Length() > Precision::Confusion()) {
+                double ovpRange =
+                    Base::toRadians(onViewParameters[OnViewParameter::Fourth]->getValue());
+
+                if (fabs(range - ovpRange) > Precision::Confusion()) {
+                    setOnViewParameterValue(OnViewParameter::Fourth,
+                                            Base::toDegrees(range),
+                                            Base::Unit::Angle);
+                }
+            }
 
             onViewParameters[OnViewParameter::Third]->setPoints(start, end);
             onViewParameters[OnViewParameter::Fourth]->setPoints(start, Base::Vector3d());