text3D widget implementation

modules/viz/include/opencv2/viz/widgets.hpp

@@ -121,6 +121,15 @@ namespace temp_viz
         GridWidget(Vec2i dimensions, Vec2d spacing, const Color &color = Color::white());
     };
     
+    class CV_EXPORTS Text3DWidget : public Widget3D
+    {
+    public:
+        Text3DWidget(const String &text, const Point3f &position, double text_scale = 1.0, const Color &color = Color::white());
+        
+        void setText(const String &text);
+        String getText() const;
+    };
+    
     class CV_EXPORTS TextWidget : public Widget2D
     {
     public:
@@ -161,6 +170,7 @@ namespace temp_viz
     template<> CV_EXPORTS CoordinateSystemWidget Widget::cast<CoordinateSystemWidget>();
     template<> CV_EXPORTS PolyLineWidget Widget::cast<PolyLineWidget>();
     template<> CV_EXPORTS GridWidget Widget::cast<GridWidget>();
+    template<> CV_EXPORTS Text3DWidget Widget::cast<Text3DWidget>();
     template<> CV_EXPORTS TextWidget Widget::cast<TextWidget>();
     template<> CV_EXPORTS CloudWidget Widget::cast<CloudWidget>();
     template<> CV_EXPORTS CloudNormalsWidget Widget::cast<CloudNormalsWidget>();

modules/viz/src/simple_widgets.cpp

@@ -450,6 +450,59 @@ template<> temp_viz::GridWidget temp_viz::Widget::cast<temp_viz::GridWidget>()
     return static_cast<GridWidget&>(widget);
 }
 
+///////////////////////////////////////////////////////////////////////////////////////////////
+/// text3D widget implementation
+
+temp_viz::Text3DWidget::Text3DWidget(const String &text, const Point3f &position, double text_scale, const Color &color)
+{
+    vtkSmartPointer<vtkVectorText> textSource = vtkSmartPointer<vtkVectorText>::New ();
+    textSource->SetText (text.c_str());
+    textSource->Update ();
+
+    vtkSmartPointer<vtkPolyDataMapper> mapper = vtkSmartPointer<vtkPolyDataMapper>::New ();
+    mapper->SetInputConnection (textSource->GetOutputPort ());
+    
+    vtkSmartPointer<vtkFollower> actor = vtkSmartPointer<vtkFollower>::New ();
+    actor->SetMapper (mapper);
+    actor->SetPosition (position.x, position.y, position.z);
+    actor->SetScale (text_scale);
+    
+    WidgetAccessor::setProp(*this, actor);
+    setColor(color);
+}
+
+void temp_viz::Text3DWidget::setText(const String &text)
+{
+    vtkFollower *actor = vtkFollower::SafeDownCast(WidgetAccessor::getProp(*this));
+    CV_Assert(actor);
+    
+    // Update text source
+    vtkPolyDataMapper *mapper = vtkPolyDataMapper::SafeDownCast(actor->GetMapper());
+    vtkVectorText * textSource = vtkVectorText::SafeDownCast(mapper->GetInputConnection(0,0)->GetProducer());
+    CV_Assert(textSource);
+    
+    textSource->SetText(text.c_str());
+    textSource->Update();
+}
+
+temp_viz::String temp_viz::Text3DWidget::getText() const
+{
+    vtkFollower *actor = vtkFollower::SafeDownCast(WidgetAccessor::getProp(*this));
+    CV_Assert(actor);
+    
+    vtkPolyDataMapper *mapper = vtkPolyDataMapper::SafeDownCast(actor->GetMapper());
+    vtkVectorText * textSource = vtkVectorText::SafeDownCast(mapper->GetInputConnection(0,0)->GetProducer());
+    CV_Assert(textSource);
+    
+    return textSource->GetText();
+}
+
+template<> temp_viz::Text3DWidget temp_viz::Widget::cast<temp_viz::Text3DWidget>()
+{
+    Widget3D widget = this->cast<Widget3D>();
+    return static_cast<Text3DWidget&>(widget);
+}
+
 ///////////////////////////////////////////////////////////////////////////////////////////////
 /// text widget implementation
 

modules/viz/test/test_viz3d.cpp

@@ -142,6 +142,9 @@ TEST(Viz_viz3d, accuracy)
     temp_viz::GridWidget gw(temp_viz::Vec2i(10,10), temp_viz::Vec2d(0.1,0.1));
     v.showWidget("grid", gw);
     lw = v.getWidget("grid").cast<temp_viz::LineWidget>();
+    
+    temp_viz::Text3DWidget t3w("OpenCV", cv::Point3f(0.0, 2.0, 0.0), 1.0, temp_viz::Color(255,255,0));
+    v.showWidget("txt3d", t3w);
 //     float grid_x_angle = 0.0;
     
     while(!v.wasStopped())