[Java3Djp:00604] LineTest.java

[ENDO Yasuyuki <eyasuyuki@xxxxxxxxxx>]

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あまりきれいな実装ではありませんが、マウスクリックした点をつないで
LineStripArray を描画するサンプルを書きましたので投稿します。
クリック点は最大 50 です。

// Java 3Dテスト用アプレット
// LineTest.java

import java.applet.*;
import java.awt.*;
import java.awt.event.*;
import javax.media.j3d.*;
import javax.vecmath.*;
import com.sun.j3d.utils.applet.MainFrame;
import com.sun.j3d.utils.universe.SimpleUniverse;
import com.sun.j3d.utils.geometry.ColorCube;

public class LineTest extends Applet {
  public final int MAX_VERTICES = 50;
  public int vertexCount = 0;
  public Point3d[] vertices = new Point3d[MAX_VERTICES];
  boolean debug = true;
  Canvas3D canvas = null;
  SimpleUniverse universe = null;
  BranchGroup scene = null;
  TransformGroup objTrans = null;
  Shape3D shape = null;
  LineStripArray geometry = null;

  public LineTest() {
    GraphicsConfiguration config =
      SimpleUniverse.getPreferredConfiguration();
    canvas = new Canvas3D(config);
    this.setLayout(new BorderLayout());
    this.add(canvas, "Center");
    canvas.addMouseListener(new MyMouseAdapter(this));

    universe = new SimpleUniverse(canvas);
    universe.getViewingPlatform().setNominalViewingTransform();

    scene = createSceneGraph();

    universe.addBranchGraph(scene);
  }

  private BranchGroup createSceneGraph() {
    BranchGroup objRoot = new BranchGroup();
    objRoot.setCapability(Group.ALLOW_CHILDREN_EXTEND);
    objRoot.setCapability(Group.ALLOW_CHILDREN_READ);
    objRoot.setCapability(Group.ALLOW_CHILDREN_WRITE);
    objRoot.setCapability(BranchGroup.ALLOW_DETACH);

    for (int i=0; i < vertices.length; i++) {
      vertices[i] = new Point3d();
    }
    int[] lineStripCounts = { vertices.length };
    geometry =
      new LineStripArray(vertices.length, GeometryArray.COORDINATES, lineStripCounts);
    geometry.setCoordinates(0, vertices);

    shape = new Shape3D(geometry);
    shape.setCapability(Shape3D.ALLOW_GEOMETRY_READ);
    shape.setCapability(Shape3D.ALLOW_GEOMETRY_WRITE);

    objTrans = new TransformGroup();
    
    objTrans.addChild(shape);

    objRoot.addChild(objTrans);

    return objRoot;
  }

  public void addPoint(int xpos, int ypos) {
    vertexCount++;
    if (vertexCount > MAX_VERTICES) vertexCount = MAX_VERTICES;
    
    Transform3D motion=new Transform3D();
    Point3d eyePosn = new Point3d();
    Point3d mousePosn = new Point3d();
    Vector3d mouseVec=new Vector3d();
    
    canvas.getCenterEyeInImagePlate(eyePosn);
    canvas.getPixelLocationInImagePlate(xpos,ypos,mousePosn);
    canvas.getImagePlateToVworld(motion);

    if (debug) {
      System.out.println("mouse position " + xpos + " " + ypos);
      System.out.println("before, mouse " + mousePosn + " eye " + eyePosn);
    }
    motion.transform(eyePosn);
    motion.transform(mousePosn);
    mouseVec.sub(mousePosn, eyePosn);
    mouseVec.normalize();
    
    if (debug) {
      System.out.println("vertexCount=" + vertexCount);
      System.out.println(motion + "\n");
      System.out.println("after, mouse " + mousePosn + " eye " + eyePosn + 
        " mouseVec " + mouseVec);
    }
    
    universe.getLocale().removeBranchGraph(scene);
    
    vertices[vertexCount - 1].x = mousePosn.x;
    vertices[vertexCount - 1].y = mousePosn.y;
    vertices[vertexCount - 1].z = mousePosn.z;
    
    if (vertexCount > 1) {
      int[] lineStripCounts = { vertexCount };
      geometry =
        new LineStripArray(vertexCount, GeometryArray.COORDINATES, lineStripCounts);
      Point3d[] subVertices = new Point3d[vertexCount];
      for (int i=0; i < vertexCount; i++) {
        subVertices[i] = vertices[i];
      }
      geometry.setCoordinates(0, subVertices);
      shape.setGeometry(geometry);
    }

    universe.addBranchGraph(scene);
  }

  public static void main(String[] args) {
    LineTest applet = new LineTest();
    MainFrame frame = new MainFrame(applet, 500, 500);
  }
}

class MyMouseAdapter implements MouseListener {
  LineTest applet = null;
  MyMouseAdapter(LineTest applet) {
    this.applet = applet;
  }
  public void mousePressed( MouseEvent e ){}
  public void mouseReleased( MouseEvent e ){}
  public void mouseEntered( MouseEvent e ){}
  public void mouseExited( MouseEvent e ){}
  public void mouseClicked( MouseEvent e ){
    applet.addPoint(e.getX(), e.getY());
  }
}
-- 
えんどう やすゆき <yasuyuki@xxxxxxxxxx>
http://www.javaopen.org/jfriends/ (Java互助会ホームページ)