+ fixes #0000844: Cannot use edge hidden by sketch axis as external geometry

src/Mod/Sketcher/Gui/CommandCreateGeo.cpp

@@ -23,6 +23,7 @@
 
 #include "PreCompiled.h"
 #ifndef _PreComp_
+# include <Inventor/nodes/SoPickStyle.h>
 #endif
 
 #include <boost/math/special_functions/fpclassify.hpp>
@@ -2335,6 +2336,7 @@ public:
 
     virtual void activated(ViewProviderSketch *sketchgui)
     {
+        sketchgui->setAxisPickStyle(false);
         Gui::MDIView *mdi = Gui::Application::Instance->activeDocument()->getActiveView();
         Gui::View3DInventorViewer *viewer;
         viewer = static_cast<Gui::View3DInventor *>(mdi)->getViewer();
@@ -2348,6 +2350,11 @@ public:
         setCursor(QPixmap(cursor_external),7,7);
     }
 
+    virtual void deactivated(ViewProviderSketch *sketchgui)
+    {
+        sketchgui->setAxisPickStyle(true);
+    }
+
     virtual void mouseMove(Base::Vector2D onSketchPos)
     {
         if (Gui::Selection().getPreselection().pObjectName)

src/Mod/Sketcher/Gui/DrawSketchHandler.h

@@ -68,6 +68,7 @@ public:
     virtual ~DrawSketchHandler();
 
     virtual void activated(ViewProviderSketch *sketchgui){};
+    virtual void deactivated(ViewProviderSketch *sketchgui){};
     virtual void mouseMove(Base::Vector2D onSketchPos)=0;
     virtual bool pressButton(Base::Vector2D onSketchPos)=0;
     virtual bool releaseButton(Base::Vector2D onSketchPos)=0;

src/Mod/Sketcher/Gui/ViewProviderSketch.cpp

@@ -51,6 +51,7 @@
 # include <Inventor/nodes/SoTranslation.h>
 # include <Inventor/nodes/SoText2.h>
 # include <Inventor/nodes/SoFont.h>
+# include <Inventor/nodes/SoPickStyle.h>
 # include <Inventor/sensors/SoIdleSensor.h>
 # include <Inventor/nodes/SoCamera.h>
 
@@ -147,7 +148,7 @@ struct EditData {
     PointsCoordinate(0),
     CurvesCoordinate(0),
     CurveSet(0), EditCurveSet(0), RootCrossSet(0),
-    PointSet(0)
+    PointSet(0), pickStyleAxes(0)
     {}
 
     // pointer to the active handler for new sketch objects
@@ -200,6 +201,7 @@ struct EditData {
     SoTranslation *textPos;
 
     SoGroup       *constrGroup;
+    SoPickStyle   *pickStyleAxes;
 };
 
 
@@ -281,6 +283,7 @@ void ViewProviderSketch::deactivateHandler()
 {
     assert(edit);
     assert(edit->sketchHandler != 0);
+    edit->sketchHandler->deactivated(this);
     edit->sketchHandler->unsetCursor();
     delete(edit->sketchHandler);
     edit->sketchHandler = 0;
@@ -301,6 +304,15 @@ void ViewProviderSketch::purgeHandler(void)
     static_cast<Gui::SoFCUnifiedSelection*>(root)->selectionRole.setValue(FALSE);
 }
 
+void ViewProviderSketch::setAxisPickStyle(bool on)
+{
+    assert(edit);
+    if (on)
+        edit->pickStyleAxes->style = SoPickStyle::SHAPE;
+    else
+        edit->pickStyleAxes->style = SoPickStyle::UNPICKABLE;
+}
+
 // **********************************************************************************
 
 bool ViewProviderSketch::keyPressed(bool pressed, int key)
@@ -3173,6 +3185,9 @@ void ViewProviderSketch::createEditInventorNodes(void)
 
     // stuff for the RootCross lines +++++++++++++++++++++++++++++++++++++++
     SoGroup* crossRoot = new Gui::SoSkipBoundingGroup;
+    edit->pickStyleAxes = new SoPickStyle();
+    edit->pickStyleAxes->style = SoPickStyle::SHAPE;
+    crossRoot->addChild(edit->pickStyleAxes);
     edit->EditRoot->addChild(crossRoot);
     MtlBind = new SoMaterialBinding;
     MtlBind->setName("RootCrossMaterialBinding");

src/Mod/Sketcher/Gui/ViewProviderSketch.h

@@ -106,6 +106,8 @@ public:
     void activateHandler(DrawSketchHandler *newHandler);
     /// removes the active handler
     void purgeHandler(void);
+    /// set the pick style of the sketch coordinate axes
+    void setAxisPickStyle(bool on);
     //@}
 
     /** @name modus handling */