initial base widget implementation

modules/viz/include/opencv2/viz/types.hpp

@@ -113,4 +113,22 @@ namespace temp_viz
 
     template<typename _Tp> inline bool isNan(const Point3_<_Tp>& p)
     { return isNan(p.x) || isNan(p.y) || isNan(p.z); }
+    
+    class Widget
+    {
+    public:
+        Widget();
+        Widget(const String &id);
+        Widget(const Widget &other);
+        
+        void setId(const String &id);
+        void setColor(const Color &color);
+        void setPose(const Affine3f &pose);
+        void updatePose(const Affine3f &pose);
+        Affine3f getPose() const;
+    private:
+        class Impl;
+        cv::Ptr<Impl> impl_;
+        friend struct WidgetAccessor;
+    }; 
 }

modules/viz/include/opencv2/viz/widget_accessor.hpp

@@ -0,0 +1,12 @@
+#pragma once
+
+#include "precomp.hpp"
+#include "types.hpp"
+
+namespace temp_viz
+{
+    struct WidgetAccessor
+    {
+        static CV_EXPORTS vtkSmartPointer<vtkActor> getActor(const Widget &widget);
+    };
+}