From 75d43757c46d2ad64d26051a8fdb48d1bba272a2 Mon Sep 17 00:00:00 2001
From: wandererfan <wandererfan@gmail.com>
Date: Mon, 13 May 2019 09:03:04 -0400
Subject: [PATCH] Fix crash on malformed python script

---
 src/Mod/TechDraw/App/DrawProjGroup.cpp | 46 ++++++++++++++++++++++----
 src/Mod/TechDraw/App/DrawProjGroup.h   |  1 +
 2 files changed, 41 insertions(+), 6 deletions(-)

diff --git a/src/Mod/TechDraw/App/DrawProjGroup.cpp b/src/Mod/TechDraw/App/DrawProjGroup.cpp
index 116d3075985d..1d25cee9df29 100644
--- a/src/Mod/TechDraw/App/DrawProjGroup.cpp
+++ b/src/Mod/TechDraw/App/DrawProjGroup.cpp
@@ -71,8 +71,10 @@ DrawProjGroup::DrawProjGroup(void)
     Source.setScope(App::LinkScope::Global);
     ADD_PROPERTY_TYPE(Anchor, (0), group, App::Prop_None, "The root view to align projections with");
     Anchor.setScope(App::LinkScope::Global);
+    
+    
     ProjectionType.setEnums(ProjectionTypeEnums);
-    ADD_PROPERTY(ProjectionType, ((long)0));
+    ADD_PROPERTY(ProjectionType, ((long)getDefProjConv()));
 
     ADD_PROPERTY_TYPE(AutoDistribute ,(autoDist),agroup,App::Prop_None,"Distribute Views Automatically or Manually");
     ADD_PROPERTY_TYPE(spacingX, (15), agroup, App::Prop_None, "Horizontal spacing between views");
@@ -390,6 +392,10 @@ App::DocumentObject * DrawProjGroup::addProjection(const char *viewProjType)
     DrawProjGroupItem *view( nullptr );
     std::pair<Base::Vector3d,Base::Vector3d> vecs;
 
+    DrawPage* dp = findParentPage();
+    if (dp == nullptr) {
+        Base::Console().Error("DPG:addProjection - %s - DPG is not on a page!\n",getNameInDocument());
+    }
 
     if ( checkViewProjType(viewProjType) && !hasProjection(viewProjType) ) {
         std::string FeatName = getDocument()->getUniqueObjectName("ProjItem");
@@ -690,8 +696,16 @@ int DrawProjGroup::getViewIndex(const char *viewTypeCStr) const
     int result = 4;                                        //default to front view's position
     // Determine layout - should be either "First Angle" or "Third Angle"
     const char* projType;
+    DrawPage* dp = findParentPage();
     if (ProjectionType.isValue("Default")) {
-        projType = findParentPage()->ProjectionType.getValueAsString();
+        if (dp != nullptr) {
+            projType = dp->ProjectionType.getValueAsString();
+        } else {
+            Base::Console().Warning("DPG: %s - can not find parent page. Using default Projection Type. (1)\n",
+                                    getNameInDocument());
+            int projConv = getDefProjConv();
+            projType = ProjectionTypeEnums[projConv + 1];
+        }
     } else {
         projType = ProjectionType.getValueAsString();
     }
@@ -745,7 +759,17 @@ void DrawProjGroup::arrangeViewPointers(DrawProjGroupItem *viewPtrs[10]) const
     // Determine layout - should be either "First Angle" or "Third Angle"
     const char* projType;
     if (ProjectionType.isValue("Default")) {
-        projType = findParentPage()->ProjectionType.getValueAsString();
+        DrawPage* dp = findParentPage();
+        if (dp != nullptr) {
+            projType = dp->ProjectionType.getValueAsString();
+        } else {
+            Base::Console().Error("DPG:arrangeViewPointers - %s - DPG is not on a page!\n",
+                                    getNameInDocument());
+            Base::Console().Warning("DPG:arrangeViewPointers - using system default Projection Type\n",
+                                    getNameInDocument());
+            int projConv = getDefProjConv();
+            projType = ProjectionTypeEnums[projConv + 1];
+        }
     } else {
         projType = ProjectionType.getValueAsString();
     }
@@ -793,12 +817,15 @@ void DrawProjGroup::arrangeViewPointers(DrawProjGroupItem *viewPtrs[10]) const
                 } else if (strcmp(viewTypeCStr, "FrontBottomRight") == 0) {
                     viewPtrs[thirdAngle ? 9 : 0] = oView;
                 } else {
-                    throw Base::TypeError("Unknown view type in DrawProjGroup::arrangeViewPointers()");
+                    Base::Console().Warning("DPG: %s - unknown view type: %s. \n",
+                                            getNameInDocument(),viewTypeCStr);
+                    throw Base::TypeError("Unknown view type in DrawProjGroup::arrangeViewPointers.");
                 }
             }
         }
     } else {
-        throw Base::ValueError("Unknown view type in DrawProjGroup::arrangeViewPointers()");
+        Base::Console().Warning("DPG: %s - unknown Projection convention: %s\n",getNameInDocument(),projType);
+        throw Base::ValueError("Unknown Projection convention in DrawProjGroup::arrangeViewPointers");
     }
 }
 
@@ -1144,7 +1171,6 @@ void DrawProjGroup::spinCCW()
     updateSecondaryDirs();
 }
 
-
 std::vector<DrawProjGroupItem*> DrawProjGroup::getViewsAsDPGI()
 {
     std::vector<DrawProjGroupItem*> result;
@@ -1156,6 +1182,14 @@ std::vector<DrawProjGroupItem*> DrawProjGroup::getViewsAsDPGI()
     return result;
 }
 
+int DrawProjGroup::getDefProjConv(void) const
+{
+    Base::Reference<ParameterGrp> hGrp = App::GetApplication().GetUserParameter().GetGroup("BaseApp")->
+                                                               GetGroup("Preferences")->GetGroup("Mod/TechDraw/General");
+    int defProjConv = hGrp->GetInt("ProjectionAngle",0);
+    return defProjConv;
+}
+
 /*!
  *dumps the current iso DPGI's 
  */
diff --git a/src/Mod/TechDraw/App/DrawProjGroup.h b/src/Mod/TechDraw/App/DrawProjGroup.h
index c38825be1f62..00d4736f69c5 100644
--- a/src/Mod/TechDraw/App/DrawProjGroup.h
+++ b/src/Mod/TechDraw/App/DrawProjGroup.h
@@ -162,6 +162,7 @@ class TechDrawExport DrawProjGroup : public TechDraw::DrawViewCollection
     void updateChildrenSource(void);
     void updateChildrenLock(void);
     int getViewIndex(const char *viewTypeCStr) const;
+    int getDefProjConv(void) const;
 
 };