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# WarpVector

VTKEx/CSharp/PolyData/WarpVector

### 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.

Other languages

See (Cxx), (Python)

Question

If you have a simple question about this example contact us at VTKExProject If your question is more complex and may require extended discussion, please use the VTK Discourse Forum

### Code

WarpVector.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 {
                WarpVector();
             }
             catch(Exception ex) {
                MessageBox.Show(ex.Message, "Exception", MessageBoxButtons.OK);
             }
          }

          private void WarpVector() {
             vtkPoints points = vtkPoints.New();
             points.InsertNextPoint(0.0, 0.0, 0.0);
             points.InsertNextPoint(1.0, 0.0, 0.0);
             points.InsertNextPoint(2.0, 0.0, 0.0);
             points.InsertNextPoint(3.0, 0.0, 0.0);
             points.InsertNextPoint(4.0, 0.0, 0.0);

             vtkCellArray lines = vtkCellArray.New();
             vtkLine line = vtkLine.New();
             line.GetPointIds().SetId(0, 0);
             line.GetPointIds().SetId(1, 1);
             lines.InsertNextCell(line);
             line.GetPointIds().SetId(0, 1);
             line.GetPointIds().SetId(1, 2);
             lines.InsertNextCell(line);
             line.GetPointIds().SetId(0, 2);
             line.GetPointIds().SetId(1, 3);
             lines.InsertNextCell(line);
             line.GetPointIds().SetId(0, 3);
             line.GetPointIds().SetId(1, 4);
             lines.InsertNextCell(line);

             vtkDoubleArray warpData = vtkDoubleArray.New();
             warpData.SetNumberOfComponents(3);
             warpData.SetName("warpData");
             double[] warp = new double[] { 0.0, 0.0, 0.0 };
             warp[1] = 0.0;
             warpData.InsertNextTuple3(warp[0], warp[1], warp[2]);
             warp[1] = 0.1;
             warpData.InsertNextTuple3(warp[0], warp[1], warp[2]);
             warp[1] = 0.3;
             warpData.InsertNextTuple3(warp[0], warp[1], warp[2]);
             warp[1] = 0.0;
             warpData.InsertNextTuple3(warp[0], warp[1], warp[2]);
             warp[1] = 0.1;
             warpData.InsertNextTuple3(warp[0], warp[1], warp[2]);

             vtkPolyData polydata = vtkPolyData.New();
             polydata.SetPoints(points);
             polydata.SetLines(lines);
             polydata.GetPointData().AddArray(warpData);
             polydata.GetPointData().SetActiveVectors(warpData.GetName());

             //WarpVector will use the array marked as active vector in polydata
             //it has to be a 3 component array
             //with the same number of tuples as points in polydata
             vtkWarpVector warpVector = vtkWarpVector.New();
    #if VTK_MAJOR_VERSION_5
             warpVector.SetInput(polydata);
    #else
             warpVector.SetInputData(polydata);
    #endif
             warpVector.Update();

             vtkPolyDataMapper mapper = vtkPolyDataMapper.New();
    #if VTK_MAJOR_VERSION_5
             mapper.SetInput(warpVector.GetPolyDataOutput());
    #else
             mapper.SetInputData(warpVector.GetPolyDataOutput());
    #endif
             vtkActor actor = vtkActor.New();
             actor.SetMapper(mapper);
             // get a reference to the renderwindow of our renderWindowControl1
             vtkRenderWindow renderWindow = renderWindowControl1.RenderWindow;
             // renderer
             vtkRenderer renderer = renderWindow.GetRenderers().GetFirstRenderer();
             // set background color
             renderer.SetBackground(.2, .6, .3);
             renderer.AddActor(actor);
          }
       }
    }