[vtkusers] Java example for CSpline

[Todd Simons]

Hello all,

I'm a relatively new VTK developer.  I am using Java as the gui for my VTK
applications.  I had a hard time getting started and finding examples
written in Java.  I have ported a dozen examples to Java to get familiar
with it.  I wanted to post my examples so other Java enthusiasts could get
up to speed on VTK a bit more easily.  I hope this helps.

Best Regards,
Todd




package examples;

import vtk.*;

import javax.swing.*;
import java.awt.*;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;

/**
 * This example demonstrates the use of vtkCardinalSpline.
 * It creates random points and connects them with a spline
 */
public class CSpline extends JPanel {

//from vtk.util.colors import tomato, banana

  public CSpline () {
    setLayout(new BorderLayout());
    vtkPanel renWin = new vtkPanel();
    vtkRenderer renderer = renWin.GetRenderer();

    int numberOfInputPoints = 20;

    // One spline for each direction.
    vtkCardinalSpline aSplineX, aSplineY, aSplineZ;
    aSplineX = new vtkCardinalSpline();
    aSplineY = new vtkCardinalSpline();
    aSplineZ = new vtkCardinalSpline();

/*  Generate random (pivot) points and add the corresponding
 *  coordinates to the splines.
 *  aSplineX will interpolate the x values of the points
 *  aSplineY will interpolate the y values of the points
 *  aSplineZ will interpolate the z values of the points */
    vtkMath math=new vtkMath();
    vtkPoints inputPoints = new vtkPoints();
    for (int i=0; i<numberOfInputPoints; i++) {
      double x = math.Random(0, 1);
      double y = math.Random(0, 1);
      double z = math.Random(0, 1);
      aSplineX.AddPoint(i, x);
      aSplineY.AddPoint(i, y);
      aSplineZ.AddPoint(i, z);
      inputPoints.InsertPoint(i, x, y, z);
    } //i loop

    // The following section will create glyphs for the pivot points
    // in order to make the effect of the spline more clear.

    // Create a polydata to be glyphed.
    vtkPolyData inputData = new vtkPolyData();
    inputData.SetPoints(inputPoints);

    // Use sphere as glyph source.
    vtkSphereSource balls = new vtkSphereSource();
      balls.SetRadius(.01);
      balls.SetPhiResolution(10);
      balls.SetThetaResolution(10);

    vtkGlyph3D glyphPoints = new vtkGlyph3D();
      glyphPoints.SetInput(inputData);
      glyphPoints.SetSource(balls.GetOutput());

    vtkPolyDataMapper glyphMapper = new vtkPolyDataMapper();
      glyphMapper.SetInputConnection(glyphPoints.GetOutputPort());

    vtkActor glyph = new vtkActor();
      glyph.SetMapper(glyphMapper);
      glyph.GetProperty().SetDiffuseColor(0.0, 1.0, 0.0);
      glyph.GetProperty().SetSpecular(.3);
      glyph.GetProperty().SetSpecularPower(30);

    // Generate the polyline for the spline.
    vtkPoints points = new vtkPoints();
    vtkPolyData profileData = new vtkPolyData();

    // Number of points on the spline
    int numberOfOutputPoints = 400;

    // Interpolate x, y and z by using the three spline filters and
    // create new points
    double t;
    for (int i=0; i<numberOfOutputPoints; i++) {
      t =
(double)(numberOfInputPoints-1)/(double)(numberOfOutputPoints-1)*(double)i;
      points.InsertPoint(i, aSplineX.Evaluate(t), aSplineY.Evaluate(t),
                       aSplineZ.Evaluate(t));
    }//i loop

    // Create the polyline.
    vtkCellArray lines = new vtkCellArray();
    lines.InsertNextCell(numberOfOutputPoints);
    for (int i=0; i<numberOfOutputPoints; i++) lines.InsertCellPoint(i);

    profileData.SetPoints(points);
    profileData.SetLines(lines);

    // Add thickness to the resulting line.
    vtkTubeFilter profileTubes = new vtkTubeFilter();
      profileTubes.SetNumberOfSides(8);
      profileTubes.SetInput(profileData);
      profileTubes.SetRadius(.005);

    vtkPolyDataMapper profileMapper = new vtkPolyDataMapper();
      profileMapper.SetInputConnection(profileTubes.GetOutputPort());

    vtkActor profile = new vtkActor();
      profile.SetMapper(profileMapper);
      profile.GetProperty().SetDiffuseColor(1.0, 0.0, 0.0);
      profile.GetProperty().SetSpecular(.3);
      profile.GetProperty().SetSpecularPower(30);

  renderer.AddActor(glyph);
  renderer.AddActor(profile);
  renderer.SetBackground(1,1,1);

  add(renWin, BorderLayout.CENTER);

  }//constructor

    /**
     * main method
     */
    public static void main(String s[]) {

        CSpline panel = new CSpline();

        JFrame frame = new JFrame("CSpline");
        frame.addWindowListener(new WindowAdapter() {
            public void windowClosing(WindowEvent e) {
                System.exit(0);
            }
        });
        frame.getContentPane().add("Center", panel);
        frame.pack();
        frame.setVisible(true);
    }//main

} //class CSpline
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