Viz === .. highlight:: cpp This section describes 3D visualization window as well as classes and methods that are used to interact with it. 3D visualization window (see :ocv:class:`Viz3d`) is used to display widgets (see :ocv:class:`Widget`), and it provides several methods to interact with scene and widgets. viz::makeTransformToGlobal -------------------------- Takes coordinate frame data and builds transform to global coordinate frame. .. ocv:function:: Affine3f viz::makeTransformToGlobal(const Vec3f& axis_x, const Vec3f& axis_y, const Vec3f& axis_z, const Vec3f& origin = Vec3f::all(0)) :param axis_x: X axis vector in global coordinate frame. :param axis_y: Y axis vector in global coordinate frame. :param axis_z: Z axis vector in global coordinate frame. :param origin: Origin of the coordinate frame in global coordinate frame. This function returns affine transform that describes transformation between global coordinate frame and a given coordinate frame. viz::makeCameraPose ------------------- Constructs camera pose from position, focal_point and up_vector (see gluLookAt() for more infromation). .. ocv:function:: Affine3f makeCameraPose(const Vec3f& position, const Vec3f& focal_point, const Vec3f& y_dir) :param position: Position of the camera in global coordinate frame. :param focal_point: Focal point of the camera in global coordinate frame. :param y_dir: Up vector of the camera in global coordinate frame. This function returns pose of the camera in global coordinate frame. viz::get -------- Retrieves a window by its name. .. ocv:function:: Viz3d get(const String &window_name) :param window_name: Name of the window that is to be retrieved. This function returns a :ocv:class:`Viz3d` object with the given name. .. note:: If the window with that name already exists, that window is returned. Otherwise, new window is created with the given name, and it is returned. .. note:: Window names are automatically prefixed by "Viz - " if it is not done by the user. .. code-block:: cpp /// window and window_2 are the same windows. viz::Viz3d window = viz::get("myWindow"); viz::Viz3d window_2 = viz::get("Viz - myWindow"); viz::isNan ---------- Checks **float/double** value for nan. .. ocv:function:: bool isNan(float x) .. ocv:function:: bool isNan(double x) :param x: return true if nan. Checks **vector** for nan. .. ocv:function:: bool isNan(const Vec<_Tp, cn>& v) :param v: return true if **any** of the elements of the vector is *nan*. Checks **point** for nan .. ocv:function:: bool isNan(const Point3_<_Tp>& p) :param p: return true if **any** of the elements of the point is *nan*. viz::Viz3d ---------- .. ocv:class:: Viz3d The Viz3d class represents a 3D visualizer window. This class is implicitly shared. :: class CV_EXPORTS Viz3d { public: typedef cv::Ptr Ptr; typedef void (*KeyboardCallback)(const KeyboardEvent&, void*); typedef void (*MouseCallback)(const MouseEvent&, void*); Viz3d(const String& window_name = String()); Viz3d(const Viz3d&); Viz3d& operator=(const Viz3d&); ~Viz3d(); void showWidget(const String &id, const Widget &widget, const Affine3f &pose = Affine3f::Identity()); void removeWidget(const String &id); Widget getWidget(const String &id) const; void removeAllWidgets(); void setWidgetPose(const String &id, const Affine3f &pose); void updateWidgetPose(const String &id, const Affine3f &pose); Affine3f getWidgetPose(const String &id) const; void setCamera(const Camera &camera); Camera getCamera() const; Affine3f getViewerPose(); void setViewerPose(const Affine3f &pose); void resetCameraViewpoint (const String &id); void resetCamera(); void convertToWindowCoordinates(const Point3d &pt, Point3d &window_coord); void converTo3DRay(const Point3d &window_coord, Point3d &origin, Vec3d &direction); Size getWindowSize() const; void setWindowSize(const Size &window_size); String getWindowName() const; void saveScreenshot (const String &file); void setWindowPosition (int x, int y); void setFullScreen (bool mode); void setBackgroundColor(const Color& color = Color::black()); void spin(); void spinOnce(int time = 1, bool force_redraw = false); bool wasStopped() const; void registerKeyboardCallback(KeyboardCallback callback, void* cookie = 0); void registerMouseCallback(MouseCallback callback, void* cookie = 0); void setRenderingProperty(const String &id, int property, double value); double getRenderingProperty(const String &id, int property); void setDesiredUpdateRate(double rate); double getDesiredUpdateRate(); void setRepresentation(int representation); private: /* hidden */ }; viz::Viz3d::Viz3d ----------------- The constructors. .. ocv:function:: Viz3d::Viz3d(const String& window_name = String()) :param window_name: Name of the window. viz::Viz3d::showWidget ---------------------- Shows a widget in the window. .. ocv:function:: void Viz3d::showWidget(const String &id, const Widget &widget, const Affine3f &pose = Affine3f::Identity()) :param id: A unique id for the widget. :param widget: The widget to be displayed in the window. :param pose: Pose of the widget. viz::Viz3d::removeWidget ------------------------ Removes a widget from the window. .. ocv:function:: void removeWidget(const String &id) :param id: The id of the widget that will be removed. viz::Viz3d::getWidget --------------------- Retrieves a widget from the window. A widget is implicitly shared; that is, if the returned widget is modified, the changes will be immediately visible in the window. .. ocv:function:: Widget getWidget(const String &id) const :param id: The id of the widget that will be returned. viz::Viz3d::removeAllWidgets ---------------------------- Removes all widgets from the window. .. ocv:function:: void removeAllWidgets() viz::Viz3d::setWidgetPose ------------------------- Sets pose of a widget in the window. .. ocv:function:: void setWidgetPose(const String &id, const Affine3f &pose) :param id: The id of the widget whose pose will be set. :param pose: The new pose of the widget. viz::Viz3d::updateWidgetPose ---------------------------- Updates pose of a widget in the window by pre-multiplying its current pose. .. ocv:function:: void updateWidgetPose(const String &id, const Affine3f &pose) :param id: The id of the widget whose pose will be updated. :param pose: The pose that the current pose of the widget will be pre-multiplied by. viz::Viz3d::getWidgetPose ------------------------- Returns the current pose of a widget in the window. .. ocv:function:: Affine3f getWidgetPose(const String &id) const :param id: The id of the widget whose pose will be returned. viz::Viz3d::setCamera --------------------- Sets the intrinsic parameters of the viewer using Camera. .. ocv:function:: void setCamera(const Camera &camera) :param camera: Camera object wrapping intrinsinc parameters. viz::Viz3d::getCamera --------------------- Returns a camera object that contains intrinsic parameters of the current viewer. .. ocv:function:: Camera getCamera() const viz::Viz3d::getViewerPose ------------------------- Returns the current pose of the viewer. ..ocv:function:: Affine3f getViewerPose() viz::Viz3d::setViewerPose ------------------------- Sets pose of the viewer. .. ocv:function:: void setViewerPose(const Affine3f &pose) :param pose: The new pose of the viewer. viz::Viz3d::resetCameraViewpoint -------------------------------- Resets camera viewpoint to a 3D widget in the scene. .. ocv:function:: void resetCameraViewpoint (const String &id) :param pose: Id of a 3D widget. viz::Viz3d::resetCamera ----------------------- Resets camera. .. ocv:function:: void resetCamera() viz::Viz3d::convertToWindowCoordinates -------------------------------------- Transforms a point in world coordinate system to window coordinate system. .. ocv:function:: void convertToWindowCoordinates(const Point3d &pt, Point3d &window_coord) :param pt: Point in world coordinate system. :param window_coord: Output point in window coordinate system. viz::Viz3d::converTo3DRay ------------------------- Transforms a point in window coordinate system to a 3D ray in world coordinate system. .. ocv:function:: void converTo3DRay(const Point3d &window_coord, Point3d &origin, Vec3d &direction) :param window_coord: Point in window coordinate system. :param origin: Output origin of the ray. :param direction: Output direction of the ray. viz::Viz3d::getWindowSize ------------------------- Returns the current size of the window. .. ocv:function:: Size getWindowSize() const viz::Viz3d::setWindowSize ------------------------- Sets the size of the window. .. ocv:function:: void setWindowSize(const Size &window_size) :param window_size: New size of the window. viz::Viz3d::getWindowName ------------------------- Returns the name of the window which has been set in the constructor. .. ocv:function:: String getWindowName() const viz::Viz3d::saveScreenshot -------------------------- Saves screenshot of the current scene. .. ocv:function:: void saveScreenshot(const String &file) :param file: Name of the file. viz::Viz3d::setWindowPosition ----------------------------- Sets the position of the window in the screen. .. ocv:function:: void setWindowPosition(int x, int y) :param x: x coordinate of the window :param y: y coordinate of the window viz::Viz3d::setFullScreen ------------------------- Sets or unsets full-screen rendering mode. .. ocv:function:: void setFullScreen(bool mode) :param mode: If true, window will use full-screen mode. viz::Viz3d::setBackgroundColor ------------------------------ Sets background color. .. ocv:function:: void setBackgroundColor(const Color& color = Color::black()) viz::Viz3d::spin ---------------- The window renders and starts the event loop. .. ocv:function:: void spin() viz::Viz3d::spinOnce -------------------- Starts the event loop for a given time. .. ocv:function:: void spinOnce(int time = 1, bool force_redraw = false) :param time: Amount of time in milliseconds for the event loop to keep running. :param force_draw: If true, window renders. viz::Viz3d::wasStopped ---------------------- Returns whether the event loop has been stopped. .. ocv:function:: bool wasStopped() viz::Viz3d::registerKeyboardCallback ------------------------------------ Sets keyboard handler. .. ocv:function:: void registerKeyboardCallback(KeyboardCallback callback, void* cookie = 0) :param callback: Keyboard callback ``(void (*KeyboardCallbackFunction(const KeyboardEvent&, void*))``. :param cookie: The optional parameter passed to the callback. viz::Viz3d::registerMouseCallback --------------------------------- Sets mouse handler. .. ocv:function:: void registerMouseCallback(MouseCallback callback, void* cookie = 0) :param callback: Mouse callback ``(void (*MouseCallback)(const MouseEvent&, void*))``. :param cookie: The optional parameter passed to the callback. viz::Viz3d::setRenderingProperty -------------------------------- Sets rendering property of a widget. .. ocv:function:: void setRenderingProperty(const String &id, int property, double value) :param id: Id of the widget. :param property: Property that will be modified. :param value: The new value of the property. **Rendering property** can be one of the following: * **POINT_SIZE** * **OPACITY** * **LINE_WIDTH** * **FONT_SIZE** * **REPRESENTATION**: Expected values are * **REPRESENTATION_POINTS** * **REPRESENTATION_WIREFRAME** * **REPRESENTATION_SURFACE** * **IMMEDIATE_RENDERING**: * Turn on immediate rendering by setting the value to ``1``. * Turn off immediate rendering by setting the value to ``0``. * **SHADING**: Expected values are * **SHADING_FLAT** * **SHADING_GOURAUD** * **SHADING_PHONG** viz::Viz3d::getRenderingProperty -------------------------------- Returns rendering property of a widget. .. ocv:function:: double getRenderingProperty(const String &id, int property) :param id: Id of the widget. :param property: Property. **Rendering property** can be one of the following: * **POINT_SIZE** * **OPACITY** * **LINE_WIDTH** * **FONT_SIZE** * **REPRESENTATION**: Expected values are * **REPRESENTATION_POINTS** * **REPRESENTATION_WIREFRAME** * **REPRESENTATION_SURFACE** * **IMMEDIATE_RENDERING**: * Turn on immediate rendering by setting the value to ``1``. * Turn off immediate rendering by setting the value to ``0``. * **SHADING**: Expected values are * **SHADING_FLAT** * **SHADING_GOURAUD** * **SHADING_PHONG** viz::Viz3d::setDesiredUpdateRate -------------------------------- Sets desired update rate of the window. .. ocv:function:: void setDesiredUpdateRate(double rate) :param rate: Desired update rate. The default is 30. viz::Viz3d::getDesiredUpdateRate -------------------------------- Returns desired update rate of the window. .. ocv:function:: double getDesiredUpdateRate() viz::Viz3d::setRepresentation ----------------------------- Sets geometry representation of the widgets to surface, wireframe or points. .. ocv:function:: void setRepresentation(int representation) :param representation: Geometry representation which can be one of the following: * **REPRESENTATION_POINTS** * **REPRESENTATION_WIREFRAME** * **REPRESENTATION_SURFACE** viz::Color ---------- .. ocv:class:: Color This class a represents BGR color. :: class CV_EXPORTS Color : public Scalar { public: Color(); Color(double gray); Color(double blue, double green, double red); Color(const Scalar& color); static Color black(); static Color blue(); static Color green(); static Color cyan(); static Color red(); static Color magenta(); static Color yellow(); static Color white(); static Color gray(); }; viz::Mesh3d ----------- .. ocv:class:: Mesh3d This class wraps mesh attributes, and it can load a mesh from a ``ply`` file. :: class CV_EXPORTS Mesh3d { public: Mat cloud, colors; Mat polygons; //! Loads mesh from a given ply file static Mesh3d loadMesh(const String& file); private: /* hidden */ }; viz::Mesh3d::loadMesh --------------------- Loads a mesh from a ``ply`` file. .. ocv:function:: static Mesh3d loadMesh(const String& file) :param file: File name. viz::KeyboardEvent ------------------ .. ocv:class:: KeyboardEvent This class represents a keyboard event. :: class CV_EXPORTS KeyboardEvent { public: static const unsigned int Alt = 1; static const unsigned int Ctrl = 2; static const unsigned int Shift = 4; //! Create a keyboard event //! - Note that action is true if key is pressed, false if released KeyboardEvent (bool action, const std::string& key_sym, unsigned char key, bool alt, bool ctrl, bool shift); bool isAltPressed () const; bool isCtrlPressed () const; bool isShiftPressed () const; unsigned char getKeyCode () const; const String& getKeySym () const; bool keyDown () const; bool keyUp () const; protected: /* hidden */ }; viz::KeyboardEvent::KeyboardEvent --------------------------------- Constructs a KeyboardEvent. .. ocv:function:: KeyboardEvent (bool action, const std::string& key_sym, unsigned char key, bool alt, bool ctrl, bool shift) :param action: If true, key is pressed. If false, key is released. :param key_sym: Name of the key. :param key: Code of the key. :param alt: If true, ``alt`` is pressed. :param ctrl: If true, ``ctrl`` is pressed. :param shift: If true, ``shift`` is pressed. viz::MouseEvent --------------- .. ocv:class:: MouseEvent This class represents a mouse event. :: class CV_EXPORTS MouseEvent { public: enum Type { MouseMove = 1, MouseButtonPress, MouseButtonRelease, MouseScrollDown, MouseScrollUp, MouseDblClick } ; enum MouseButton { NoButton = 0, LeftButton, MiddleButton, RightButton, VScroll } ; MouseEvent (const Type& type, const MouseButton& button, const Point& p, bool alt, bool ctrl, bool shift); Type type; MouseButton button; Point pointer; unsigned int key_state; }; viz::MouseEvent::MouseEvent --------------------------- Constructs a MouseEvent. .. ocv:function:: MouseEvent (const Type& type, const MouseButton& button, const Point& p, bool alt, bool ctrl, bool shift) :param type: Type of the event. This can be **MouseMove**, **MouseButtonPress**, **MouseButtonRelease**, **MouseScrollDown**, **MouseScrollUp**, **MouseDblClick**. :param button: Mouse button. This can be **NoButton**, **LeftButton**, **MiddleButton**, **RightButton**, **VScroll**. :param p: Position of the event. :param alt: If true, ``alt`` is pressed. :param ctrl: If true, ``ctrl`` is pressed. :param shift: If true, ``shift`` is pressed. viz::Camera ----------- .. ocv:class:: Camera This class wraps intrinsic parameters of a camera. It provides several constructors that can extract the intrinsic parameters from ``field of view``, ``intrinsic matrix`` and ``projection matrix``. :: class CV_EXPORTS Camera { public: Camera(float f_x, float f_y, float c_x, float c_y, const Size &window_size); Camera(const Vec2f &fov, const Size &window_size); Camera(const cv::Matx33f &K, const Size &window_size); Camera(const cv::Matx44f &proj, const Size &window_size); inline const Vec2d & getClip() const { return clip_; } inline void setClip(const Vec2d &clip) { clip_ = clip; } inline const Size & getWindowSize() const { return window_size_; } void setWindowSize(const Size &window_size); inline const Vec2f & getFov() const { return fov_; } inline void setFov(const Vec2f & fov) { fov_ = fov; } inline const Vec2f & getPrincipalPoint() const { return principal_point_; } inline const Vec2f & getFocalLength() const { return focal_; } void computeProjectionMatrix(Matx44f &proj) const; static Camera KinectCamera(const Size &window_size); private: /* hidden */ }; viz::Camera::Camera ------------------- Constructs a Camera. .. ocv:function:: Camera(float f_x, float f_y, float c_x, float c_y, const Size &window_size) :param f_x: Horizontal focal length. :param f_y: Vertical focal length. :param c_x: x coordinate of the principal point. :param c_y: y coordinate of the principal point. :param window_size: Size of the window. This together with focal length and principal point determines the field of view. .. ocv:function:: Camera(const Vec2f &fov, const Size &window_size) :param fov: Field of view (horizontal, vertical) :param window_size: Size of the window. Principal point is at the center of the window by default. .. ocv:function:: Camera(const cv::Matx33f &K, const Size &window_size) :param K: Intrinsic matrix of the camera. :param window_size: Size of the window. This together with intrinsic matrix determines the field of view. .. ocv:function:: Camera(const cv::Matx44f &proj, const Size &window_size) :param proj: Projection matrix of the camera. :param window_size: Size of the window. This together with projection matrix determines the field of view. viz::Camera::computeProjectionMatrix ------------------------------------ Computes projection matrix using intrinsic parameters of the camera. .. ocv:function:: void computeProjectionMatrix(Matx44f &proj) const :param proj: Output projection matrix. viz::Camera::KinectCamera ------------------------- Creates a Kinect Camera. .. ocv:function:: static Camera KinectCamera(const Size &window_size) :param window_size: Size of the window. This together with intrinsic matrix of a Kinect Camera determines the field of view.