KochanekSpline

VTKExamples/Java/PolyData/KochanekSpline


Description

The vtkKochanekSpline provides three parameters to control the shape of the spline:

  1. Tension - Changes the length of the tangent vector
  2. Bias - Primarily changes the direction of the tangent vector
  3. Continuity - Changes the sharpness in change between tangents

Other Languages

See (Cxx)

Code

KochanekSpline.java

import vtk.vtkActor;
import vtk.vtkNamedColors;
import vtk.vtkPointSource;
import vtk.vtkPoints;
import vtk.vtkKochanekSpline;
import vtk.vtkParametricSpline;
import vtk.vtkParametricFunctionSource;
import vtk.vtkNativeLibrary;
import vtk.vtkPolyDataMapper;
import vtk.vtkRenderWindow;
import vtk.vtkRenderWindowInteractor;
import vtk.vtkRenderer;
import vtk.vtkPolyData;
import vtk.vtkSphereSource;
import vtk.vtkGlyph3DMapper;

public class KochanekSpline  
{
  // -----------------------------------------------------------------
  // Load VTK library and print which library was not properly loaded
  static 
  {
    if (!vtkNativeLibrary.LoadAllNativeLibraries()) 
    {
      for (vtkNativeLibrary lib : vtkNativeLibrary.values()) 
      {
        if (!lib.IsLoaded()) 
        {
          System.out.println(lib.GetLibraryName() + " not loaded");
        }
      }
    }
    vtkNativeLibrary.DisableOutputWindow(null);
  }
  // -----------------------------------------------------------------

  public static void main(String s[]) 
  {
    vtkNamedColors Color = new vtkNamedColors();

    //For Actor Color
    double ActorColor[] = new double[4];
    //For Point Actor Color
    double PointActorColor[] = new double[4];
    //Renderer Background Color
    double BgColor[] = new double[4];


    //Change Color Name to Use your own Color for Change Actor Color
    Color.GetColor("DarkSlateGrey",ActorColor);
    //Change Color Name to Use your own Color for Change Outline Actor Color
    Color.GetColor("Red",PointActorColor);
    //Change Color Name to Use your own Color for Renderer Background
    Color.GetColor("White",BgColor);

    int numberOfPoints = 10;
    vtkPointSource pointSource = new vtkPointSource();
    pointSource.SetNumberOfPoints(numberOfPoints);
    pointSource.Update();

    vtkPoints Points = pointSource.GetOutput().GetPoints();

    vtkKochanekSpline xSpline = new vtkKochanekSpline();
    vtkKochanekSpline ySpline = new vtkKochanekSpline();
    vtkKochanekSpline zSpline = new vtkKochanekSpline();

    vtkParametricSpline spline = new vtkParametricSpline();
    spline.SetXSpline(xSpline);
    spline.SetYSpline(ySpline);
    spline.SetZSpline(zSpline);
    spline.SetPoints(Points);

    vtkParametricFunctionSource functionSource = new vtkParametricFunctionSource();
    functionSource.SetParametricFunction(spline);
    functionSource.SetUResolution(50*numberOfPoints);
    functionSource.SetVResolution(50*numberOfPoints);
    functionSource.SetWResolution(50*numberOfPoints);
    functionSource.Update();

    vtkPolyDataMapper Mapper = new vtkPolyDataMapper();
    Mapper.SetInputConnection(functionSource.GetOutputPort());


    vtkActor Actor = new vtkActor();
    Actor.SetMapper(Mapper);
    Actor.GetProperty().SetColor(ActorColor);
    Actor.GetProperty().SetLineWidth(3.0);

    //Glyph the points
    vtkSphereSource Sphere = new vtkSphereSource();
    Sphere.SetRadius(0.02);
    Sphere.SetPhiResolution(21);
    Sphere.SetThetaResolution(21);


    vtkPolyData polyData = new vtkPolyData();
    polyData.SetPoints(Points);

    vtkGlyph3DMapper PointMapper = new vtkGlyph3DMapper();
    PointMapper.SetInputData(polyData);
    PointMapper.SetSourceConnection(Sphere.GetOutputPort());

    vtkActor PointActor = new vtkActor();
    PointActor.SetMapper(PointMapper);
    PointActor.GetProperty().SetColor(PointActorColor);

    // Create the renderer, render window and interactor.
    vtkRenderer ren = new vtkRenderer();
    vtkRenderWindow renWin = new vtkRenderWindow();
    renWin.AddRenderer(ren);
    vtkRenderWindowInteractor iren = new vtkRenderWindowInteractor();
    iren.SetRenderWindow(renWin);

    // Visualise the arrow
    ren.AddActor(Actor);
    ren.AddActor(PointActor);
    ren.SetBackground(BgColor);
    ren.ResetCamera();

    renWin.SetSize(300,300);
    renWin.Render();

    iren.Initialize();
    iren.Start();

  }
}