add zoom to selected

src/Vtk/vtkViewport.cpp

@@ -215,6 +215,9 @@ void Viewport::SetupPipeline(vtkRenderWindowInteractor* iren)
           self->m_HandlerWidget->SetReferenceFrame(vtkHandlerWidget::CENTER_LOCAL);
           std::cout << "Widget Frame: CENTER_LOCAL" << std::endl;
         }
+        else if (key == "s") {
+          self->ZoomSelected();
+        }
         
         iren->Render();
     });
@@ -235,6 +238,45 @@ void Viewport::ZoomAuto()
     }
 }
 
+void Viewport::ZoomSelected()
+{
+    if (!m_Renderer) return;
+
+    Puppet* selected = nullptr;
+    for (auto* p : m_Puppets) {
+        if (p->IsSelected()) {
+            selected = p;
+            break;
+        }
+    }
+    if (!selected) return;
+
+    vtkProp* prop = selected->GetProp();
+    if (!prop) return;
+
+    double* b = prop->GetBounds();
+    if (!b) return;
+    
+    double bounds[6];
+    std::copy(b, b + 6, bounds);
+    
+    if (bounds[0] > bounds[1]) return; // Invalid bounds
+
+    // Expand bounds by 1.5 from center
+    double center[3] = {(bounds[0] + bounds[1]) / 2.0, (bounds[2] + bounds[3]) / 2.0, (bounds[4] + bounds[5]) / 2.0};
+    double h_ext[3] =  {(bounds[1] - bounds[0]) / 2.0, (bounds[3] - bounds[2]) / 2.0, (bounds[5] - bounds[4]) / 2.0};
+    
+    double newBounds[6];
+    for (int i=0; i<3; ++i) {
+        newBounds[2*i]   = center[i] - 1.5 * h_ext[i];
+        newBounds[2*i+1] = center[i] + 1.5 * h_ext[i];
+    }
+    
+    m_Renderer->ResetCamera(newBounds);
+    m_Renderer->ResetCameraClippingRange();
+    this->Render();
+}
+
 void Viewport::AddPuppet(Puppet& prop)
 {
     m_Puppets.push_back(&prop);