From e5ae85e8fd0a4107f9637440907e2cd7cd8ab599 Mon Sep 17 00:00:00 2001
From: wandererfan <wandererfan@gmail.com>
Date: Fri, 19 Jan 2024 19:32:29 -0500
Subject: [PATCH] [TD]protect against stretch factor == 0

---
 src/Mod/TechDraw/App/DrawViewSection.cpp | 8 ++++++++
 src/Mod/TechDraw/App/DrawViewSection.h   | 5 ++++-
 2 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/src/Mod/TechDraw/App/DrawViewSection.cpp b/src/Mod/TechDraw/App/DrawViewSection.cpp
index 3d527715ae..01ab923556 100644
--- a/src/Mod/TechDraw/App/DrawViewSection.cpp
+++ b/src/Mod/TechDraw/App/DrawViewSection.cpp
@@ -125,6 +125,13 @@ const char* DrawViewSection::SectionDirEnums[] =
 
 const char* DrawViewSection::CutSurfaceEnums[] = {"Hide", "Color", "SvgHatch", "PatHatch", nullptr};
 
+constexpr double stretchMinimum{EWTOLERANCE};
+constexpr double stretchMaximum{std::numeric_limits<double>::max()};
+constexpr double stretchStep{0.1};
+
+App::PropertyFloatConstraint::Constraints DrawViewSection::stretchRange = {
+                            stretchMinimum, stretchMaximum, stretchStep};
+
 //===========================================================================
 // DrawViewSection
 //===========================================================================
@@ -230,6 +237,7 @@ DrawViewSection::DrawViewSection()
 
     ADD_PROPERTY_TYPE(SectionLineStretch, (1.0), agroup, App::Prop_None,
                       "Adjusts the length of the section line.  1.0 is normal length.  1.1 would be 10% longer, 0.9 would be 10% shorter.");
+    SectionLineStretch.setConstraints(&stretchRange);
 
     getParameters();
 
diff --git a/src/Mod/TechDraw/App/DrawViewSection.h b/src/Mod/TechDraw/App/DrawViewSection.h
index 09eb87cfd7..ed311fe27b 100644
--- a/src/Mod/TechDraw/App/DrawViewSection.h
+++ b/src/Mod/TechDraw/App/DrawViewSection.h
@@ -104,7 +104,7 @@ public:
     App::PropertyBool TrimAfterCut;//new v021
     App::PropertyBool UsePreviousCut;   // new v022
 
-    App::PropertyFloat SectionLineStretch;  // new v022
+    App::PropertyFloatConstraint SectionLineStretch;  // new v022
 
 
     bool isReallyInBox(const Base::Vector3d v, const Base::BoundBox3d bb) const;
@@ -205,6 +205,9 @@ protected:
     bool m_waitingForCut;
     TopoDS_Shape m_cuttingTool;
     double m_shapeSize;
+
+    static App::PropertyFloatConstraint::Constraints stretchRange;
+
 };
 
 using DrawViewSectionPython = App::FeaturePythonT<DrawViewSection>;