OpenCV tutorials--creating Widgets

Explanation

• Extend Widget3d class to create a new 3D widget.

• Assign a VTK actor to the widget.

• Set color of the widget.

• Construct a triangle widget and display it in the window.

Code

#include <opencv2/viz/vizcore.hpp> #include <opencv2/viz/widget_accessor.hpp> #include <iostream> #include <vtkPoints.h> #include <vtkTriangle.h> #include <vtkCellArray.h> #include < vtkpolydata.h> #include <vtkPolyDataMapper.h> #include <vtkIdList.h> #include <vtkactor.h># Include <vtkprop.h>using namespace cv;using namespace std;/** * @class Wtriangle * @brief defining our own 3D Triang Le widget */class wtriangle:public viz::widget3d{public:wtriangle (const point3f &AMP;PT1, const point3f &amp ;p T2, const point3f &AMP;PT3, const viz::color & Color = Viz::color::white ());};/ * * @function wtriangle::wtriangle */wtriangle::wtriangle (const point3f &AMP;PT1, const point3f &AMP;PT2, const point3f & AMP;PT3, const Viz::color & Color) {//Create a triangle vtksmartpointer<vtkpoints> points = Vtksmartpoint    Er<vtkpoints>::new ();    Points->insertnextpoint (pt1.x, Pt1.y, pt1.z); Points->insertnexTpoint (pt2.x, Pt2.y, pt2.z);    Points->insertnextpoint (pt3.x, Pt3.y, pt3.z);    Vtksmartpointer<vtktriangle> triangle = vtksmartpointer<vtktriangle>::new ();    Triangle->getpointids ()->setid (0,0);    Triangle->getpointids ()->setid ();    Triangle->getpointids ()->setid (2,2);    Vtksmartpointer<vtkcellarray> cells = vtksmartpointer<vtkcellarray>::new ();    Cells->insertnextcell (triangle);    Create a Polydata object vtksmartpointer<vtkpolydata> polydata = Vtksmartpointer<vtkpolydata>::new ();    Add the geometry and topology to the Polydata polydata->setpoints (points);    Polydata->setpolys (cells); Create Mapper and actor vtksmartpointer<vtkpolydatamapper> mapper = Vtksmartpointer<vtkpolydatamapper>:    : New (); #if vtk_major_version <= 5 mapper->setinput (polydata); #else mapper->setinputdata (polydata); #endif Vtksmartpointer<vtkactor> actor = VTKSMARTPOINTER&LT;VTKACTOR&GT;::new ();    Actor->setmapper (mapper);    Store This actor in the widgets in order that visualizer can access it Viz::widgetaccessor::setprop (*this, actor); Set the color of the widget.    This have to is called after Widgetaccessor. SetColor (color);}    /** * @function main */int main () {//Create a window viz::viz3d mywindow ("Creating Widgets"); Create a triangle widget wtriangle tw (point3f (0.0,0.0,0.0), point3f (1.0,1.0,1.0), point3f (0.0,1.0,0.0), Viz::color:    : Red ());    Show widget in the visualizer window Mywindow.showwidget ("TRIANGLE", TW);    Start event Loop Mywindow.spin (); return 0;}

OpenCV tutorials--creating Widgets