import com.sun.j3d.utils.picking.*;
import com.sun.j3d.utils.universe.SimpleUniverse;
import com.sun.j3d.utils.geometry.*;
import javax.media.j3d.*;
import javax.vecmath.*;
import java.awt.event.*;
import java.awt.*;
public class Pick extends MouseAdapter {
private PickCanvas pickCanvas;
public Pick() {
Frame frame = new Frame("Box and Sphere");
GraphicsConfiguration config = SimpleUniverse
.getPreferredConfiguration();
Canvas3D canvas = new Canvas3D(config);
canvas.setSize(400, 400);
SimpleUniverse universe = new SimpleUniverse(canvas);
BranchGroup group = new BranchGroup();
// create a color cube
Vector3f vector = new Vector3f(-0.3f, 0.0f, 0.0f);
Transform3D transform = new Transform3D();
transform.setTranslation(vector);
TransformGroup transformGroup = new TransformGroup(transform);
ColorCube cube = new ColorCube(0.3);
transformGroup.addChild(cube);
group.addChild(transformGroup);
// create a sphere
Vector3f vector2 = new Vector3f(+0.3f, 0.0f, 0.0f);
Transform3D transform2 = new Transform3D();
transform2.setTranslation(vector2);
TransformGroup transformGroup2 = new TransformGroup(transform2);
Appearance appearance = new Appearance();
appearance.setPolygonAttributes(new PolygonAttributes(
PolygonAttributes.POLYGON_LINE, PolygonAttributes.CULL_BACK,
0.0f));
Sphere sphere = new Sphere(0.3f, appearance);
transformGroup2.addChild(sphere);
group.addChild(transformGroup2);
universe.getViewingPlatform().setNominalViewingTransform();
universe.addBranchGraph(group);
frame.addWindowListener(new WindowAdapter() {
@Override
public void windowClosing(WindowEvent winEvent) {
System.exit(0);
}
});
frame.add(canvas);
//frame.add("Center", canvas);
pickCanvas = new PickCanvas(canvas, group);
pickCanvas.setMode(PickCanvas.BOUNDS);
canvas.addMouseListener(this);
frame.pack();
//frame.show();
frame.setVisible(true);
}
public static void main(String[] args) {
new Pick();
}
@Override
public void mouseClicked(MouseEvent e) {
pickCanvas.setShapeLocation(e);
PickResult result = pickCanvas.pickClosest();
if (result == null) {
System.out.println("Nothing picked");
}
else {
Primitive p = (Primitive) result.getNode(PickResult.PRIMITIVE);
Shape3D s = (Shape3D) result.getNode(PickResult.SHAPE3D);
if (p != null) {
System.out.println(p.getClass().getName());
}
else if (s != null) {
System.out.println(s.getClass().getName());
}
else {
System.out.println("null");
}
}
}
}
). Bei einem Applet kommen noch mehr Fragen dazu (man würde wohl auch eher ein JApplet verwenden), aber darum könnte man sich kümmern, wenn man gezielt ein Applet entwickeln wollte. Welches Pick-Beispiel?
