/** * @file creating_widgets.cpp * @brief Creating custom widgets using VTK * @author Ozan Cagri Tonkal */ #include <opencv2/viz.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; /** * @function help * @brief Display instructions to use this tutorial program */ void help() { cout << "--------------------------------------------------------------------------" << endl << "This program shows how to create a custom widget. You can create your own " << "widgets by extending Widget2D/Widget3D, and with the help of WidgetAccessor." << endl << "Usage:" << endl << "./creating_widgets" << endl << endl; } /** * @class TriangleWidget * @brief Defining our own 3D Triangle widget */ class WTriangle : public viz::Widget3D { public: WTriangle(const Point3f &pt1, const Point3f &pt2, const Point3f &pt3, const viz::Color & color = viz::Color::white()); }; /** * @function TriangleWidget::TriangleWidget * @brief Constructor */ WTriangle::WTriangle(const Point3f &pt1, const Point3f &pt2, const Point3f &pt3, const viz::Color & color) { // Create a triangle vtkSmartPointer<vtkPoints> points = vtkSmartPointer<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(1,1); 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<vtkActor>::New(); actor->SetMapper(mapper); // Store this actor in the widget in order that visualizer can access it viz::WidgetAccessor::setProp(*this, actor); // Set the color of the widget. This has to be called after WidgetAccessor. setColor(color); } /** * @function main */ int main() { help(); /// 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; }