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