implement assignment operator and copy constructor for all widgets existing

modules/viz/include/opencv2/viz/viz3d.hpp

@@ -47,10 +47,11 @@ namespace temp_viz
         bool wasStopped() const;
         
         void showWidget(const String &id, const Widget &widget, const Affine3f &pose = Affine3f::Identity());
-        bool removeWidget(const String &id);
+        void removeWidget(const String &id);
+        Widget getWidget(const String &id) const;
         
-        bool setWidgetPose(const String &id, const Affine3f &pose);
-        bool updateWidgetPose(const String &id, const Affine3f &pose);
+        void setWidgetPose(const String &id, const Affine3f &pose);
+        void updateWidgetPose(const String &id, const Affine3f &pose);
         Affine3f getWidgetPose(const String &id) const;
     private:
         Viz3d(const Viz3d&);

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

@@ -31,6 +31,8 @@ namespace temp_viz
     {
     public:
         Widget3D() {}
+        Widget3D(const Widget& other);
+        Widget3D& operator =(const Widget &other);
         
         void setPose(const Affine3f &pose);
         void updatePose(const Affine3f &pose);
@@ -49,6 +51,8 @@ namespace temp_viz
     {
     public:
         Widget2D() {}
+        Widget2D(const Widget &other);
+        Widget2D& operator=(const Widget &other);
     };
     
 
@@ -56,6 +60,8 @@ namespace temp_viz
     {
     public:
         LineWidget(const Point3f &pt1, const Point3f &pt2, const Color &color = Color::white());
+        LineWidget(const Widget &other) : Widget3D(other) {}
+        LineWidget& operator=(const Widget &other);
         
         void setLineWidth(float line_width);
         float getLineWidth();
@@ -66,48 +72,64 @@ namespace temp_viz
     public:
         PlaneWidget(const Vec4f& coefs, double size = 1.0, const Color &color = Color::white());
         PlaneWidget(const Vec4f& coefs, const Point3f& pt, double size = 1.0, const Color &color = Color::white());
+        PlaneWidget(const Widget& other) : Widget3D(other) {}
+        PlaneWidget& operator=(const Widget& other);
     };
     
     class CV_EXPORTS SphereWidget : public Widget3D
     {
     public:
         SphereWidget(const cv::Point3f &center, float radius, int sphere_resolution = 10, const Color &color = Color::white());
+        SphereWidget(const Widget &other) : Widget3D(other) {}
+        SphereWidget& operator=(const Widget &other);
     };
     
     class CV_EXPORTS ArrowWidget : public Widget3D
     {
     public:
         ArrowWidget(const Point3f& pt1, const Point3f& pt2, const Color &color = Color::white());
+        ArrowWidget(const Widget &other) : Widget3D(other) {}
+        ArrowWidget& operator=(const Widget &other);
     };
 
     class CV_EXPORTS CircleWidget : public Widget3D
     {
     public:
         CircleWidget(const Point3f& pt, double radius, double thickness = 0.01, const Color &color = Color::white());
+        CircleWidget(const Widget& other) : Widget3D(other) {}
+        CircleWidget& operator=(const Widget &other);
     };
     
     class CV_EXPORTS CylinderWidget : public Widget3D
     {
     public:
         CylinderWidget(const Point3f& pt_on_axis, const Point3f& axis_direction, double radius, int numsides = 30, const Color &color = Color::white());
+        CylinderWidget(const Widget& other) : Widget3D(other) {}
+        CylinderWidget& operator=(const Widget &other);
     };
     
     class CV_EXPORTS CubeWidget : public Widget3D
     {
     public:
         CubeWidget(const Point3f& pt_min, const Point3f& pt_max, bool wire_frame = true, const Color &color = Color::white());
+        CubeWidget(const Widget& other) : Widget3D(other) {}
+        CubeWidget& operator=(const Widget &other);
     };
     
     class CV_EXPORTS CoordinateSystemWidget : public Widget3D
     {
     public:
         CoordinateSystemWidget(double scale, const Affine3f& affine);
+        CoordinateSystemWidget(const Widget &other) : Widget3D(other) {}
+        CoordinateSystemWidget& operator=(const Widget &other);
     };
     
     class CV_EXPORTS TextWidget : public Widget2D
     {
     public:
         TextWidget(const String &text, const Point2i &pos, int font_size = 10, const Color &color = Color::white());
+        TextWidget(const Widget& other) : Widget2D(other) {}
+        TextWidget& operator=(const Widget &other);
     };
     
     class CV_EXPORTS CloudWidget : public Widget3D
@@ -115,6 +137,9 @@ namespace temp_viz
     public:
         CloudWidget(InputArray _cloud, InputArray _colors);
         CloudWidget(InputArray _cloud, const Color &color = Color::white());
+        CloudWidget(const Widget &other) : Widget3D(other) {}
+        CloudWidget& operator=(const Widget &other);
+        
     private:
         struct CreateCloudWidget;
     };
@@ -123,6 +148,9 @@ namespace temp_viz
     {
     public:
         CloudNormalsWidget(InputArray _cloud, InputArray _normals, int level = 100, float scale = 0.02f, const Color &color = Color::white());
+        CloudNormalsWidget(const Widget &other) : Widget3D(other) {}
+        CloudNormalsWidget& operator=(const Widget &other);
+
     private:
         struct ApplyCloudNormals;
     };