Gui: Add alignToSelection() method and command

src/Gui/CommandView.cpp

@@ -4076,6 +4076,33 @@ bool StdRecallWorkingView::isActive()
     return view && view->getViewer()->hasHomePosition();
 }
 
+//===========================================================================
+// Std_AlignToSelection
+//===========================================================================
+
+DEF_STD_CMD_A(StdCmdAlignToSelection)
+
+StdCmdAlignToSelection::StdCmdAlignToSelection()
+  : Command("Std_AlignToSelection")
+{
+    sGroup        = "Standard-View";
+    sMenuText     = QT_TR_NOOP("Align to selection");
+    sToolTipText  = QT_TR_NOOP("Align the view with the selection");
+    sWhatsThis    = "Std_AlignToSelection";
+    eType         = Alter3DView;
+}
+
+void StdCmdAlignToSelection::activated(int iMsg)
+{
+    Q_UNUSED(iMsg);
+    doCommand(Command::Gui,"Gui.SendMsgToActiveView(\"AlignToSelection\")");
+}
+
+bool StdCmdAlignToSelection::isActive()
+{
+    return getGuiApplication()->sendHasMsgToActiveView("AlignToSelection");
+}
+
 //===========================================================================
 // Instantiation
 //===========================================================================
@@ -4107,6 +4134,7 @@ void CreateViewStdCommands()
     rcCmdMgr.addCommand(new StdStoreWorkingView());
     rcCmdMgr.addCommand(new StdRecallWorkingView());
     rcCmdMgr.addCommand(new StdCmdViewGroup());
+    rcCmdMgr.addCommand(new StdCmdAlignToSelection());
 
     rcCmdMgr.addCommand(new StdCmdViewExample1());
     rcCmdMgr.addCommand(new StdCmdViewExample2());

src/Gui/View3DInventor.cpp

@@ -408,6 +408,10 @@ bool View3DInventor::onMsg(const char* pMsg, const char** ppReturn)
         getGuiDocument()->saveCopy();
         return true;
     }
+    else if (strcmp("AlignToSelection", pMsg) == 0) {
+        _viewer->alignToSelection();
+        return true;
+    }
     else if (strcmp("ZoomIn", pMsg) == 0) {
         View3DInventorViewer* viewer = getViewer();
         viewer->navigationStyle()->zoomIn();
@@ -511,6 +515,9 @@ bool View3DInventor::onHasMsg(const char* pMsg) const
     else if(strncmp("Dump",pMsg,4) == 0) {
         return true;
     }
+    else if (strcmp("AlignToSelection", pMsg) == 0) {
+        return true;
+    }
     if (strcmp("ZoomIn", pMsg) == 0) {
         return true;
     }

src/Gui/View3DInventorViewer.cpp

@@ -3341,6 +3341,39 @@ void View3DInventorViewer::viewSelection()
     }
 }
 
+void View3DInventorViewer::alignToSelection()
+{
+    if (!getCamera()) {
+        return;
+    }
+
+    const auto selection = Selection().getSelection();
+
+    // Empty selection
+    if (selection.empty()) {
+        return;
+    }
+
+    // Too much selections
+    if (selection.size() > 1) {
+        return;
+    }
+
+    // Get the geo feature
+    App::GeoFeature* geoFeature = nullptr;
+    std::pair<std::string, std::string> elementName;
+    App::GeoFeature::resolveElement(selection[0].pObject, selection[0].SubName, elementName, false, App::GeoFeature::ElementNameType::Normal, nullptr, nullptr, &geoFeature);
+    if (!geoFeature) {
+        return;
+    }
+
+    Base::Vector3d direction;
+    if (geoFeature->getCameraAlignmentDirection(direction, selection[0].SubName)) {
+        const auto orientation = SbRotation(SbVec3f(0, 0, 1), Base::convertTo<SbVec3f>(direction));
+        setCameraOrientation(orientation);
+    }
+}
+
 /**
  * @brief Decide if it should be possible to start any animation
  *

src/Gui/View3DInventorViewer.h

@@ -414,6 +414,8 @@ public:
      */
     void viewSelection();
 
+    void alignToSelection();
+
     void setGradientBackground(Background);
     Background getGradientBackground() const;
     void setGradientBackgroundColor(const SbColor& fromColor,