TechDraw: Fix Coverity dynamic_cast warnings

src/Mod/TechDraw/App/DrawViewDimension.cpp

@@ -367,7 +367,11 @@ double DrawViewDimension::getDimValue() const
             }
             int idx0 = DrawUtil::getIndexFromName(subElements[0]);
             int idx1 = DrawUtil::getIndexFromName(subElements[1]);
-            TechDraw::DrawViewPart *viewPart = dynamic_cast<TechDraw::DrawViewPart *>(objects[0]);
+            auto viewPart( dynamic_cast<TechDraw::DrawViewPart *>(objects[0]) );
+            if( viewPart == nullptr ) {
+                Base::Console().Message("INFO - DVD::getDimValue - References2D not DrawViewPart\n");
+                return 0.0;
+            }
             TechDrawGeometry::BaseGeom* edge0 = viewPart->getProjEdgeByIndex(idx0);
             TechDrawGeometry::BaseGeom* edge1 = viewPart->getProjEdgeByIndex(idx1);
 

src/Mod/TechDraw/Gui/Command.cpp

@@ -302,13 +302,13 @@ void CmdTechDrawNewView::activated(int iMsg)
     std::string PageName = page->getNameInDocument();
 
     Gui::WaitCursor wc;
-    const std::vector<App::DocumentObject*> selectedProjections = getSelection().getObjectsOfType(TechDraw::DrawView::getClassTypeId());
+    const auto selectedProjections( getSelection().getObjectsOfType(TechDraw::DrawView::getClassTypeId()) );
 
     float newScale = 1.0;
     float newRotation = 0.0;
     Base::Vector3d newDirection(0.0, 0.0, 1.0);
     if (!selectedProjections.empty()) {
-        const TechDraw::DrawView* const myView = dynamic_cast<TechDraw::DrawView*>(selectedProjections.front());
+        const auto myView( static_cast<TechDraw::DrawView*>(selectedProjections.front()) );
 
         newScale = myView->Scale.getValue();
         newRotation = myView->Rotation.getValue();
@@ -435,7 +435,7 @@ void CmdTechDrawProjGroup::activated(int iMsg)
     doCommand(Doc,"App.activeDocument().%s.Source = App.activeDocument().%s",multiViewName.c_str(),SourceName.c_str());
 
     App::DocumentObject *docObj = getDocument()->getObject(multiViewName.c_str());
-    TechDraw::DrawProjGroup *multiView = dynamic_cast<TechDraw::DrawProjGroup *>(docObj);
+    auto multiView( static_cast<TechDraw::DrawProjGroup *>(docObj) );
 
     // set the anchor
     std::string anchor = "Front";
@@ -642,32 +642,31 @@ CmdTechDrawClipMinus::CmdTechDrawClipMinus()
 
 void CmdTechDrawClipMinus::activated(int iMsg)
 {
-    std::vector<App::DocumentObject*> dObj = getSelection().getObjectsOfType(TechDraw::DrawView::getClassTypeId());
+    auto dObj( getSelection().getObjectsOfType(TechDraw::DrawView::getClassTypeId()) );
     if (dObj.empty()) {
-        QMessageBox::warning(Gui::getMainWindow(), QObject::tr("Wrong selection"),
+        QMessageBox::warning( Gui::getMainWindow(),
-                             QObject::tr("Select exactly one Drawing View object."));
+                              QObject::tr("Wrong selection"),
+                              QObject::tr("Select exactly one Drawing View object.") );
         return;
     }
-    TechDraw::DrawView* view = dynamic_cast<TechDraw::DrawView*>(dObj.front());
 
-    bool clipFound = false;
+    auto view( static_cast<TechDraw::DrawView*>(dObj.front()) );
+
     TechDraw::DrawPage* page = view->findParentPage();
     const std::vector<App::DocumentObject*> pViews = page->Views.getValues();
-    TechDraw::DrawViewClip* clip = 0;
+    TechDraw::DrawViewClip *clip(nullptr);
-    for (auto& v:pViews)     {
+    for (auto &v : pViews) {
-        clip = nullptr;
+        clip = dynamic_cast<TechDraw::DrawViewClip*>(v);
-        if (v->isDerivedFrom(TechDraw::DrawViewClip::getClassTypeId())) {
+        if (clip && clip->isViewInClip(view)) {
-            clip = dynamic_cast<TechDraw::DrawViewClip*>(v);
+            break;
-            if (clip->isViewInClip(view)) {
-                clipFound = true;
-                break;
-            }
         }
+        clip = nullptr;
     }
 
-    if (!clipFound) {
+    if (!clip) {
-        QMessageBox::warning(Gui::getMainWindow(), QObject::tr("Wrong selection"),
+        QMessageBox::warning( Gui::getMainWindow(),
-                             QObject::tr("View does not belong to a Clip"));
+                              QObject::tr("Wrong selection"),
+                              QObject::tr("View does not belong to a Clip") );
         return;
     }
 

src/Mod/TechDraw/Gui/CommandCreateDims.cpp

@@ -926,10 +926,11 @@ bool _checkSelection(Gui::Command* cmd, unsigned maxObjs) {
 
 bool _checkDrawViewPart(Gui::Command* cmd) {
     std::vector<Gui::SelectionObject> selection = cmd->getSelection().getSelectionEx();
-    TechDraw::DrawViewPart * objFeat = dynamic_cast<TechDraw::DrawViewPart *>(selection[0].getObject());
+    auto objFeat( dynamic_cast<TechDraw::DrawViewPart *>(selection[0].getObject()) );
-    if(!objFeat) {
+    if( !objFeat ) {
-        QMessageBox::warning(Gui::getMainWindow(), QObject::tr("Incorrect selection"),
+        QMessageBox::warning( Gui::getMainWindow(),
-                             QObject::tr("No DrawViewPart in selection."));
+                              QObject::tr("Incorrect selection"),
+                              QObject::tr("No DrawViewPart in selection.") );
         return false;
     }
     return true;
@@ -953,9 +954,14 @@ bool _checkPartFeature(Gui::Command* cmd) {
 
 //! verify that Selection contains a valid Geometry for a single Edge Dimension
 int _isValidSingleEdge(Gui::Command* cmd) {
-    int edgeType = isInvalid;
+    auto edgeType( isInvalid );
-    std::vector<Gui::SelectionObject> selection = cmd->getSelection().getSelectionEx();
+    auto selection( cmd->getSelection().getSelectionEx() );
-    TechDraw::DrawViewPart * objFeat = dynamic_cast<TechDraw::DrawViewPart *>(selection[0].getObject());
+
+    auto objFeat( dynamic_cast<TechDraw::DrawViewPart *>(selection[0].getObject()) );
+    if( objFeat == nullptr ) {
+        return isInvalid;
+    }
+
     const std::vector<std::string> SubNames = selection[0].getSubNames();
     if (SubNames.size() == 1) {                                                 //only 1 subshape selected
         if (TechDraw::DrawUtil::getGeomTypeFromName(SubNames[0]) == "Edge") {                                //the Name starts with "Edge"

src/Mod/TechDraw/Gui/CommandDecorate.cpp

@@ -129,12 +129,14 @@ void CmdTechDrawNewHatch::activated(int iMsg)
     }
 
     std::vector<Gui::SelectionObject> selection = getSelection().getSelectionEx();
-    TechDraw::DrawViewPart * objFeat = dynamic_cast<TechDraw::DrawViewPart *>(selection[0].getObject());
+    auto objFeat( dynamic_cast<TechDraw::DrawViewPart *>(selection[0].getObject()) );
+    if( objFeat == nullptr ) {
+        return;
+    }
     const std::vector<std::string> &subNames = selection[0].getSubNames();
     TechDraw::DrawPage* page = objFeat->findParentPage();
     std::string PageName = page->getNameInDocument();
 
-    TechDraw::DrawHatch *hatch = 0;
     std::string FeatName = getUniqueObjectName("Hatch");
     std::stringstream featLabel;
     featLabel << FeatName << "F" << TechDraw::DrawUtil::getIndexFromName(subNames.at(0));
@@ -143,7 +145,7 @@ void CmdTechDrawNewHatch::activated(int iMsg)
     doCommand(Doc,"App.activeDocument().addObject('TechDraw::DrawHatch','%s')",FeatName.c_str());
     doCommand(Doc,"App.activeDocument().%s.Label = '%s'",FeatName.c_str(),featLabel.str().c_str());
 
-    hatch = dynamic_cast<TechDraw::DrawHatch *>(getDocument()->getObject(FeatName.c_str()));
+    auto hatch( static_cast<TechDraw::DrawHatch *>(getDocument()->getObject(FeatName.c_str())) );
     hatch->Source.setValue(objFeat, subNames);
     //should this be: doCommand(Doc,"App..Feat..Source = [(App...%s,%s),(App..%s,%s),...]",objs[0]->getNameInDocument(),subs[0],...);
     //seems very unwieldy

src/Mod/TechDraw/Gui/MDIViewPage.cpp

@@ -166,8 +166,8 @@ MDIViewPage::MDIViewPage(ViewProviderPage *pageVp, Gui::Document* doc, QWidget*
     setDimensionGroups();
 
     App::DocumentObject *obj = pageGui->getPageObject()->Template.getValue();
-    if(obj && obj->isDerivedFrom(TechDraw::DrawTemplate::getClassTypeId())) {
+    auto pageTemplate( dynamic_cast<TechDraw::DrawTemplate *>(obj) );
-        TechDraw::DrawTemplate *pageTemplate = dynamic_cast<TechDraw::DrawTemplate *>(obj);
+    if( pageTemplate ) {
         attachTemplate(pageTemplate);
     }
 

src/Mod/TechDraw/Gui/QGIProjGroup.cpp

@@ -196,7 +196,10 @@ QGIView * QGIProjGroup::getAnchorQItem() const
 {
     // Get the currently assigned anchor view
     App::DocumentObject *anchorObj = getDrawView()->Anchor.getValue();
-    TechDraw::DrawView *anchorView = dynamic_cast<TechDraw::DrawView *>(anchorObj);
+    auto anchorView( dynamic_cast<TechDraw::DrawView *>(anchorObj) );
+    if( anchorView == nullptr ) {
+        return nullptr;
+    }
 
     // Locate the anchor view's qgraphicsitemview
     QList<QGraphicsItem*> list = childItems();

src/Mod/TechDraw/Gui/QGIViewAnnotation.cpp

@@ -86,11 +86,10 @@ void QGIViewAnnotation::setViewAnnoFeature(TechDraw::DrawViewAnnotation *obj)
 
 void QGIViewAnnotation::updateView(bool update)
 {
-    if(getViewObject() == 0 || !getViewObject()->isDerivedFrom(TechDraw::DrawViewAnnotation::getClassTypeId()))
+    auto viewAnno( dynamic_cast<TechDraw::DrawViewAnnotation *>(getViewObject()) );
+    if( viewAnno == nullptr)
         return;
 
-    TechDraw::DrawViewAnnotation *viewAnno = dynamic_cast<TechDraw::DrawViewAnnotation *>(getViewObject());
-
     if (update ||
         viewAnno->isTouched() ||
         viewAnno->Text.isTouched() ||
@@ -118,10 +117,10 @@ void QGIViewAnnotation::draw()
 
 void QGIViewAnnotation::drawAnnotation()
 {
-    if(getViewObject() == 0 || !getViewObject()->isDerivedFrom(TechDraw::DrawViewAnnotation::getClassTypeId()))
+    auto viewAnno( dynamic_cast<TechDraw::DrawViewAnnotation *>(getViewObject()) );
+    if( viewAnno == nullptr ) {
         return;
-
+    }
-    TechDraw::DrawViewAnnotation *viewAnno = dynamic_cast<TechDraw::DrawViewAnnotation *>(getViewObject());
 
     const std::vector<std::string>& annoText = viewAnno->Text.getValues();
 

src/Mod/TechDraw/Gui/QGIViewClip.cpp

@@ -80,10 +80,10 @@ QVariant QGIViewClip::itemChange(GraphicsItemChange change, const QVariant &valu
 
 void QGIViewClip::updateView(bool update)
 {
-    if(getViewObject() == 0 || !getViewObject()->isDerivedFrom(TechDraw::DrawViewClip::getClassTypeId()))
+    auto viewClip( dynamic_cast<TechDraw::DrawViewClip *>(getViewObject()) );
+    if( viewClip == nullptr ) {
         return;
-
+    }
-    TechDraw::DrawViewClip *viewClip = dynamic_cast<TechDraw::DrawViewClip *>(getViewObject());
 
     if (update ||
         viewClip->isTouched() ||
@@ -111,10 +111,11 @@ void QGIViewClip::draw()
 
 void QGIViewClip::drawClip()
 {
-    if(getViewObject() == 0 || !getViewObject()->isDerivedFrom(TechDraw::DrawViewClip::getClassTypeId()))
+    auto viewClip( dynamic_cast<TechDraw::DrawViewClip *>(getViewObject()) );
-        return;
 
-    TechDraw::DrawViewClip *viewClip = dynamic_cast<TechDraw::DrawViewClip *>(getViewObject());
+    if( viewClip == nullptr ) {
+        return;
+    }
 
     prepareGeometryChange();
     double h = viewClip->Height.getValue();

src/Mod/TechDraw/Gui/QGIViewDimension.cpp

@@ -242,10 +242,11 @@ void QGIViewDimension::updateView(bool update)
 
 void QGIViewDimension::updateDim()
 {
-    if(getViewObject() == 0 || !getViewObject()->isDerivedFrom(TechDraw::DrawViewDimension::getClassTypeId()))
+    const auto dim( dynamic_cast<TechDraw::DrawViewDimension *>(getViewObject()) );
+    if( dim == nullptr ) {
         return;
+    }
 
-    const TechDraw::DrawViewDimension *dim = dynamic_cast<TechDraw::DrawViewDimension *>(getViewObject());
     QString labelText = QString::fromUtf8(dim->getFormatedValue().data(),dim->getFormatedValue().size());
     QFont font = datumLabel->font();
     font.setPointSizeF(dim->Fontsize.getValue());            //scene units (mm), not points
@@ -264,10 +265,11 @@ void QGIViewDimension::datumLabelDragged()
 
 void QGIViewDimension::datumLabelDragFinished()
 {
-    if(getViewObject() == 0 || !getViewObject()->isDerivedFrom(TechDraw::DrawViewDimension::getClassTypeId()))
+    auto dim( dynamic_cast<TechDraw::DrawViewDimension *>(getViewObject()) );
-        return;
 
-    TechDraw::DrawViewDimension *dim = dynamic_cast<TechDraw::DrawViewDimension *>(getViewObject());
+    if( dim == nullptr ) {
+        return;
+    }
 
     double x = datumLabel->X(),
            y = datumLabel->Y();

src/Mod/TechDraw/Gui/QGIViewPart.cpp

@@ -231,14 +231,13 @@ QPainterPath QGIViewPart::drawPainterPath(TechDrawGeometry::BaseGeom *baseGeom)
 
 void QGIViewPart::updateView(bool update)
 {
-    if (getViewObject() == 0 ||
+    auto viewPart( dynamic_cast<TechDraw::DrawViewPart *>(getViewObject()) );
-        !getViewObject()->isDerivedFrom(TechDraw::DrawViewPart::getClassTypeId())) {
+    if( viewPart == nullptr ) {
         return;
     }
 
     QGIView::updateView(update);
 
-    TechDraw::DrawViewPart *viewPart = dynamic_cast<TechDraw::DrawViewPart *>(getViewObject());
 
     if (update ||
        viewPart->isTouched() ||
@@ -276,13 +275,11 @@ void QGIViewPart::draw() {
 
 void QGIViewPart::drawViewPart()
 {
-    if ( getViewObject() == 0 ||
+    auto viewPart( dynamic_cast<TechDraw::DrawViewPart *>(getViewObject()) );
-         !getViewObject()->isDerivedFrom(TechDraw::DrawViewPart::getClassTypeId())) {
+    if ( viewPart == nullptr ) {
         return;
     }
 
-    TechDraw::DrawViewPart *viewPart = dynamic_cast<TechDraw::DrawViewPart *>(getViewObject());
-
     float lineWidth = viewPart->LineWidth.getValue() * lineScaleFactor;
     float lineWidthHid = viewPart->HiddenWidth.getValue() * lineScaleFactor;
 

src/Mod/TechDraw/Gui/QGIViewSection.cpp

@@ -60,20 +60,16 @@ void QGIViewSection::draw()
 
 void QGIViewSection::drawSectionFace()
 {
-    if(getViewObject() == 0 || !getViewObject()->isDerivedFrom(TechDraw::DrawViewSection::getClassTypeId()))
+    auto section( dynamic_cast<TechDraw::DrawViewSection *>(getViewObject()) );
-        return;
+    if( section == nullptr ) {
-
-    TechDraw::DrawViewSection *section = dynamic_cast<TechDraw::DrawViewSection *>(getViewObject());
-    if (!section->hasGeometry()) {
         return;
     }
 
-    if (!section->ShowCutSurface.getValue()) {
+    if ( !section->hasGeometry() || !section->ShowCutSurface.getValue() ) {
         return;
     }
 
-    std::vector<TechDrawGeometry::Face*> sectionFaces;
+    auto sectionFaces( section->getFaceGeometry() );
-    sectionFaces = section->getFaceGeometry();
     if (sectionFaces.empty()) {
         Base::Console().Log("INFO - QGIViewSection::drawSectionFace - No sectionFaces available. Check Section plane.\n");
         return;
@@ -92,10 +88,10 @@ void QGIViewSection::drawSectionFace()
 
 void QGIViewSection::updateView(bool update)
 {
-    if(getViewObject() == 0 || !getViewObject()->isDerivedFrom(TechDraw::DrawViewPart::getClassTypeId()))
+    auto viewPart( dynamic_cast<TechDraw::DrawViewSection *>(getViewObject()) );
+    if( viewPart == nullptr ) {
         return;
-
+    }
-    TechDraw::DrawViewSection *viewPart = dynamic_cast<TechDraw::DrawViewSection *>(getViewObject());
 
     if(update ||
        viewPart->SectionNormal.isTouched() ||

src/Mod/TechDraw/Gui/QGIViewSymbol.cpp

@@ -81,10 +81,10 @@ void QGIViewSymbol::setViewSymbolFeature(TechDraw::DrawViewSymbol *obj)
 
 void QGIViewSymbol::updateView(bool update)
 {
-    if(getViewObject() == 0 || !getViewObject()->isDerivedFrom(TechDraw::DrawViewSymbol::getClassTypeId()))
+    auto viewSymbol( dynamic_cast<TechDraw::DrawViewSymbol *>(getViewObject()) );
+    if( viewSymbol == nullptr ) {
         return;
-
+    }
-    TechDraw::DrawViewSymbol *viewSymbol = dynamic_cast<TechDraw::DrawViewSymbol *>(getViewObject());
 
     if (update ||
         viewSymbol->isTouched() ||
@@ -113,10 +113,11 @@ void QGIViewSymbol::draw()
 
 void QGIViewSymbol::drawSvg()
 {
-    if(getViewObject() == 0 || !getViewObject()->isDerivedFrom(TechDraw::DrawViewSymbol::getClassTypeId()))
+    auto viewSymbol( dynamic_cast<TechDraw::DrawViewSymbol *>(getViewObject()) );
+    if( viewSymbol == nullptr ) {
         return;
+    }
 
-    TechDraw::DrawViewSymbol *viewSymbol = dynamic_cast<TechDraw::DrawViewSymbol *>(getViewObject());
 //note: svg's are overscaled by (72 pixels(pts actually) /in)*(1 in/25.4 mm) = 2.834645669   (could be 96/25.4(CSS)? 110/25.4?)
 //due to 1 sceneUnit (1mm) = 1 pixel for some QtSvg functions