# PolygonalSurfaceContourLineInterpolator

VTKExamples/CSharp/PolyData/PolygonalSurfaceContourLineInterpolator

### Description

A tutorial on how to setup a Windows Forms Application utilizing ActiViz.NET can be found here: Setup a Windows Forms Application to use ActiViz.NET
Note: As long as ActiViz.NET is not build with VTK version 6.0 or higher you must define the preprocessor directive VTK_MAJOR_VERSION_5.

### Code

PolygonalSurfaceContourLineInterpolator.cs

    using System;
    using System.Collections.Generic;
    using System.ComponentModel;
    using System.Windows.Forms;
    using System.Diagnostics;

    using Kitware.VTK;

    namespace ActiViz.Examples {
       public partial class Form1 : Form {
          public Form1() {
             InitializeComponent();
          }

          private void renderWindowControl1_Load(object sender, EventArgs e) {
             try {
                PolygonalSurfaceContourLineInterpolator();
             }
             catch(Exception ex) {
                MessageBox.Show(ex.Message, "Exception", MessageBoxButtons.OK);
             }
          }

          private void PolygonalSurfaceContourLineInterpolator() {
             vtkPolyData polyData;
             vtkSphereSource sphereSource = vtkSphereSource.New();
             sphereSource.SetThetaResolution(40);
             sphereSource.SetPhiResolution(20);
             sphereSource.Update();

             polyData = sphereSource.GetOutput();
             // The Dijkstra interpolator will not accept cells that aren't triangles
             vtkTriangleFilter triangleFilter = vtkTriangleFilter.New();
    #if VTK_MAJOR_VERSION_5
             triangleFilter.SetInput( polyData );
    #else
             triangleFilter.SetInputData( polyData );
    #endif
             triangleFilter.Update();

             vtkPolyData pd = triangleFilter.GetOutput();

             //Create a mapper and actor
             vtkPolyDataMapper mapper = vtkPolyDataMapper.New();
             mapper.SetInputConnection(triangleFilter.GetOutputPort());

             vtkActor actor = vtkActor.New();
             actor.SetMapper(mapper);
             actor.GetProperty().SetInterpolationToFlat();

             // get a reference to the renderwindow of our renderWindowControl1
             vtkRenderWindow renderWindow = renderWindowControl1.RenderWindow;
             // renderer
             vtkRenderer renderer = renderWindow.GetRenderers().GetFirstRenderer();
             // set background color
             renderer.SetBackground(0.3, 0.4, 0.5);
             // add our actor to the renderer
             renderer.AddActor(actor);

             // Here comes the contour widget stuff.....
             vtkContourWidget contourWidget = vtkContourWidget.New();
             contourWidget.SetInteractor(renderWindow.GetInteractor());
             vtkOrientedGlyphContourRepresentation rep =
                vtkOrientedGlyphContourRepresentation.SafeDownCast(
                   contourWidget.GetRepresentation());
             rep.GetLinesProperty().SetColor(1, 0.2, 0);
             rep.GetLinesProperty().SetLineWidth(3.0f);

             vtkPolygonalSurfacePointPlacer pointPlacer =
                vtkPolygonalSurfacePointPlacer.New();
             pointPlacer.AddProp(actor);
             pointPlacer.GetPolys().AddItem(pd);
             rep.SetPointPlacer(pointPlacer);

             vtkPolygonalSurfaceContourLineInterpolator interpolator =
                vtkPolygonalSurfaceContourLineInterpolator.New();
             interpolator.GetPolys().AddItem(pd);
             rep.SetLineInterpolator(interpolator);

             renderWindow.Render();
             contourWidget.EnabledOn();
          }
       }
    }