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OrientedCylinder

vtk-examples/Java/GeometricObjects/OrientedCylinder

Description

This example illustrates how to create and display a cylinder that passes through two points.

It demonstrates two different ways to apply the transform:

1) Use vtkTransformPolyDataFilter to create a new transformed polydata. This method is useful if the transformed polydata is needed later in the pipeline, e.g. vtkGlyph3DFilter. 2) Apply the transform directly to the actor using vtkProp3D's SetUserMatrix. No new data is produced.

Other languages

See (Cxx), (Python)

Question

If you have a question about this example, please use the VTK Discourse Forum

Code

OrientedCylinder.java

import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;


import vtk.vtkActor;
import vtk.vtkCylinderSource;
import vtk.vtkNativeLibrary;
import vtk.vtkPanel;
import vtk.vtkPolyDataMapper;
import vtk.vtkMinimalStandardRandomSequence;
import vtk.vtkNamedColors;
import vtk.vtkMath;
import vtk.vtkMatrix4x4;
import vtk.vtkTransform;
import vtk.vtkTransformPolyDataFilter;
import vtk.vtkSphereSource;


public class OrientedCylinder extends JPanel implements ActionListener {
  private static final long serialVersionUID = 1L;
  private vtkPanel renWin;
  private JButton exitButton;

  // -----------------------------------------------------------------
  // 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 OrientedCylinder() {
    super(new BorderLayout());


    vtkNamedColors Color = new vtkNamedColors();


    //For Actor Color
    double StartActorColor[] = new double[4];
    double CylinderActorColor[] = new double[4];
    double EndActorColor[] = new double[4];
    //Renderer Background Color
    double BgColor[] = new double[4];


    //Change Color Name to Use your own Color for Change StartActor Color
    Color.GetColor("Red",StartActorColor);
    //Change Color Name to Use your own Color for Change StartActor Color
    Color.GetColor("Lime",CylinderActorColor);
    //Change Color Name to Use your own Color for Change StartActor Color
    Color.GetColor("Blue",EndActorColor);
    //Change Color Name to Use your own Color for Renderer Background
    Color.GetColor("Ivory",BgColor); 

    // Create a cylinder.
    // Cylinder height vector is (0,1,0).
    // Cylinder center is in the middle of the cylinder
    vtkCylinderSource CylinderSource = new vtkCylinderSource();
    CylinderSource.SetResolution(15);

    double sp[] = new double[3];
    double ep[] = new double[3];

    // Generate a random start and end point
    vtkMinimalStandardRandomSequence RandomNumbers = new vtkMinimalStandardRandomSequence();
    RandomNumbers.SetSeed(8775070);
    for(int i=0;i<3;++i) {
      RandomNumbers.Next();
      sp[i]=RandomNumbers.GetRangeValue(-10, 10);
      RandomNumbers.Next();
      ep[i]=RandomNumbers.GetRangeValue(-10, 10);
    }

    // Compute a basis
    double normalizedX[] = new double[3];
    double normalizedY[] = new double[3];
    double normalizedZ[] = new double[3];

    // The X axis is a vector from start to end
    vtkMath ss = new vtkMath();
    ss.Subtract(ep, sp, normalizedX);
    double length;
    length=ss.Norm(normalizedX);
    ss.Normalize(normalizedX);

    // The Z axis is an arbitrary vector cross X
    double arbitary[] = new double[3];
    for(int i=0;i<3;++i) {
      RandomNumbers.Next();
      arbitary[i]=RandomNumbers.GetRangeValue(-10, 10);
    }
    ss.Cross(normalizedX, arbitary, normalizedZ);
    ss.Normalize(normalizedZ);

    // The Y axis is Z cross X
    ss.Cross(normalizedZ, normalizedX, normalizedY);
    vtkMatrix4x4 Matrix = new vtkMatrix4x4();
    // Create the direction cosine matrix
    Matrix.Identity();
    for(int i=0;i<3;i++) {
      Matrix.SetElement(i, 0, normalizedX[i]);
      Matrix.SetElement(i, 1, normalizedY[i]);
      Matrix.SetElement(i, 2, normalizedZ[i]);
    }

    vtkTransform Transform = new vtkTransform();
    Transform.Translate(sp);
    Transform.Concatenate(Matrix);
    Transform.RotateZ(-90.0);
    Transform.Scale(1.0,length,1.0);
    Transform.Translate(0.0,0.5,0.0);

    // Apply the transforms
    vtkTransformPolyDataFilter TransformPD = new vtkTransformPolyDataFilter();
    TransformPD.SetTransform(Transform);
    TransformPD.SetInputConnection(CylinderSource.GetOutputPort());

    // Transform the polydata
    vtkPolyDataMapper Mapper = new vtkPolyDataMapper();
    vtkActor Actor = new vtkActor();
    Mapper.SetInputConnection(CylinderSource.GetOutputPort());


    Actor.SetMapper(Mapper);
    Actor.SetUserMatrix(Transform.GetMatrix());
    Actor.GetProperty().SetColor(CylinderActorColor);

    vtkSphereSource SphereStartSource = new vtkSphereSource();
    SphereStartSource.SetCenter(sp);
    SphereStartSource.SetRadius(0.8);

    vtkPolyDataMapper SphereStartMapper = new vtkPolyDataMapper();
    SphereStartMapper.SetInputConnection(SphereStartSource.GetOutputPort());

    vtkActor SphereStartActor = new vtkActor();
    SphereStartActor.SetMapper(SphereStartMapper);
    SphereStartActor.GetProperty().SetColor(StartActorColor);

    vtkSphereSource SphereEndSource = new vtkSphereSource();
    SphereEndSource.SetCenter(ep);
    SphereEndSource.SetRadius(0.8);

    vtkPolyDataMapper SphereEndMapper = new vtkPolyDataMapper();
    SphereEndMapper.SetInputConnection(SphereEndSource.GetOutputPort());

    vtkActor SphereEndActor = new vtkActor();
    SphereEndActor.SetMapper(SphereEndMapper);
    SphereEndActor.GetProperty().SetColor(EndActorColor);


    renWin = new vtkPanel();
    renWin.GetRenderer().AddActor(Actor);
    renWin.GetRenderer().AddActor(SphereStartActor);
    renWin.GetRenderer().AddActor(SphereEndActor);
    renWin.GetRenderer().SetBackground(BgColor);;
    renWin.resetCamera();


    // Add Java UI components
    exitButton = new JButton("Exit");
    exitButton.addActionListener(this);

    add(renWin, BorderLayout.CENTER);
    add(exitButton, BorderLayout.SOUTH);
  }

  /** An ActionListener that listens to the button. */
  public void actionPerformed(ActionEvent e) {
    if (e.getSource().equals(exitButton)) {
      System.exit(0);
    }
  }

  public static void main(String s[]) {
    SwingUtilities.invokeLater(new Runnable() {
        public void run() {
          JFrame frame = new JFrame("Oriented Cylinder");
          frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
          frame.getContentPane().setLayout(new BorderLayout());
          frame.getContentPane().add(new OrientedCylinder(), BorderLayout.CENTER);
          frame.setSize(400, 400);
          frame.setLocationRelativeTo(null);
          frame.setVisible(true);
        }
      });
  }
}