From fc4e83ad63082777d042146683ed22e2df60000b Mon Sep 17 00:00:00 2001
From: Zolko <zolko@zzaero.com>
Date: Tue, 14 Apr 2020 10:14:26 +0200
Subject: [PATCH] setting Datum Line size manually

---
 src/Mod/PartDesign/App/DatumLine.cpp          | 26 +++++++++++++++++++
 src/Mod/PartDesign/App/DatumLine.h            |  8 ++++++
 .../PartDesign/Gui/ViewProviderDatumLine.cpp  | 19 +++++++++++++-
 .../PartDesign/Gui/ViewProviderDatumLine.h    |  3 ++-
 4 files changed, 54 insertions(+), 2 deletions(-)

diff --git a/src/Mod/PartDesign/App/DatumLine.cpp b/src/Mod/PartDesign/App/DatumLine.cpp
index e446f0b656..bd63bf1c96 100644
--- a/src/Mod/PartDesign/App/DatumLine.cpp
+++ b/src/Mod/PartDesign/App/DatumLine.cpp
@@ -35,10 +35,23 @@
 using namespace PartDesign;
 using namespace Attacher;
 
+// ============================================================================
+
+const char* Line::ResizeModeEnums[]= {"Automatic","Manual",NULL};
+
 PROPERTY_SOURCE(PartDesign::Line, Part::Datum)
 
 Line::Line()
 {
+    // These properties are only relevant for the visual appearance.
+    // Since they are getting changed from within its view provider
+    // their type is set to "Output" to avoid that they are marked as
+    // touched all the time.
+    ADD_PROPERTY_TYPE(ResizeMode,(static_cast<long>(0)), "Size", App::Prop_Output, "Automatic or manual resizing");
+    ResizeMode.setEnums(ResizeModeEnums);
+    ADD_PROPERTY_TYPE(Length,(20), "Size", App::Prop_Output, "Length of the line");
+    Length.setReadOnly(true);
+
     this->setAttacher(new AttachEngineLine);
     // Create a shape, which will be used by the Sketcher. Them main function is to avoid a dependency of
     // Sketcher on the PartDesign module
@@ -63,3 +76,16 @@ Base::Vector3d Line::getDirection() const
     rot.multVec(Base::Vector3d(0,0,1), dir);
     return dir;
 }
+
+void Line::onChanged(const App::Property *prop)
+{
+    if (prop == &ResizeMode) {
+        if (ResizeMode.getValue() == 0) {
+            Length.setReadOnly(true);
+        }
+        else {
+            Length.setReadOnly(false);
+        }
+    }
+    Datum::onChanged(prop);
+}
diff --git a/src/Mod/PartDesign/App/DatumLine.h b/src/Mod/PartDesign/App/DatumLine.h
index 1351ef5dfc..d7f1c044b0 100644
--- a/src/Mod/PartDesign/App/DatumLine.h
+++ b/src/Mod/PartDesign/App/DatumLine.h
@@ -26,6 +26,7 @@
 #define PARTDESIGN_DATUMLINE_H
 
 #include <Mod/Part/App/DatumFeature.h>
+#include <App/PropertyUnits.h>
 
 namespace PartDesign
 {
@@ -38,11 +39,18 @@ public:
     Line();
     virtual ~Line();
 
+    App::PropertyEnumeration ResizeMode;
+    App::PropertyLength Length;
+    virtual void onChanged(const App::Property *prop);
+    
     const char* getViewProviderName(void) const {
         return "PartDesignGui::ViewProviderDatumLine";
     }
 
     Base::Vector3d getDirection() const;
+    
+private:
+    static const char* ResizeModeEnums[];
 };
 
 } //namespace PartDesign
diff --git a/src/Mod/PartDesign/Gui/ViewProviderDatumLine.cpp b/src/Mod/PartDesign/Gui/ViewProviderDatumLine.cpp
index 1c608f3ced..2129b01e2c 100644
--- a/src/Mod/PartDesign/Gui/ViewProviderDatumLine.cpp
+++ b/src/Mod/PartDesign/Gui/ViewProviderDatumLine.cpp
@@ -71,6 +71,11 @@ void ViewProviderDatumLine::updateData(const App::Property* prop)
     if (strcmp(prop->getName(),"Placement") == 0) {
         updateExtents ();
     }
+    else if (strcmp(prop->getName(),"Length") == 0) {
+        PartDesign::Line* pcDatum = static_cast<PartDesign::Line*>(this->getObject());
+        if (pcDatum->ResizeMode.getValue() != 0)
+            setExtents(pcDatum->Length.getValue());
+    }
 
     ViewProviderDatum::updateData(prop);
 }
@@ -78,7 +83,11 @@ void ViewProviderDatumLine::updateData(const App::Property* prop)
 
 void ViewProviderDatumLine::setExtents (Base::BoundBox3d bbox) {
     PartDesign::Line* pcDatum = static_cast<PartDesign::Line*>(this->getObject());
-
+    // set manual size
+    if (pcDatum->ResizeMode.getValue() != 0) {
+        setExtents(pcDatum->Length.getValue());
+        return;
+    }
     Base::Placement plm = pcDatum->Placement.getValue ().inverse ();
 
     // Transform the box to the line's coordinates, the result line will be larger than the bbox
@@ -93,3 +102,11 @@ void ViewProviderDatumLine::setExtents (Base::BoundBox3d bbox) {
     pCoords->point.set1Value(0, 0, 0, bbox.MaxZ + margin );
     pCoords->point.set1Value(1, 0, 0, bbox.MinZ - margin );
 }
+
+void ViewProviderDatumLine::setExtents(double l)
+{
+    // Change the coordinates of the line
+    pCoords->point.setNum (2);
+    pCoords->point.set1Value(0, 0, 0, l/2 );
+    pCoords->point.set1Value(1, 0, 0, -l/2 );
+}
diff --git a/src/Mod/PartDesign/Gui/ViewProviderDatumLine.h b/src/Mod/PartDesign/Gui/ViewProviderDatumLine.h
index 204e47d07b..fde0c63ae0 100644
--- a/src/Mod/PartDesign/Gui/ViewProviderDatumLine.h
+++ b/src/Mod/PartDesign/Gui/ViewProviderDatumLine.h
@@ -43,7 +43,8 @@ public:
     virtual void attach ( App::DocumentObject *obj );
     virtual void updateData(const App::Property*);
 
-    virtual void setExtents (Base::BoundBox3d bbox);
+    void setExtents (Base::BoundBox3d bbox);
+    void setExtents(double l);
 
 private:
     SoCoordinate3 *pCoords;