pickinghelper.java

来自「Java mulitplayer strategy game. Adaptati」· Java 代码 · 共 82 行

/*
 * Created on 2005-10-10
 * $Id: PickingHelper.java,v 1.1 2005/11/10 13:45:47 macx2k Exp $
 */
package net.sf.jawp.j3d.picking;

import java.util.Enumeration;

import javax.media.j3d.Geometry;
import javax.media.j3d.Group;
import javax.media.j3d.Node;
import javax.media.j3d.Shape3D;

import com.sun.j3d.utils.picking.PickTool;

/**
 * Helper class for Java3D picking operations.
 * 
 * @author Maciej Malecki
 * @version $Revision: 1.1 $
 */
public final class PickingHelper
{
	private PickingHelper()
	{
	}

	/**
	 * Enables picking for specified complex object.
	 * 
	 * @param node
	 *            object to be picking enabled
	 */
	public static void enablePicking(final Node node)
	{
		node.setPickable(true);
		node.setCapability(Node.ENABLE_PICK_REPORTING);

		if (node instanceof Group)
		{
			final Group group = (Group) node;
			for (final Enumeration children = group.getAllChildren(); children
					.hasMoreElements();)
			{
				final Node child = (Node) children.nextElement();
				enablePicking(child);
			}
		}

		if (node instanceof Shape3D)
		{
			allowIntersect(node);
		}
	}
	
	public static void allowIntersect(final Node node)
	{
		if (node instanceof Group)
		{
			final Group group = (Group) node;
			for (final Enumeration children = group.getAllChildren(); children
					.hasMoreElements();)
			{
				final Node child = (Node) children.nextElement();
				allowIntersect(child);
			}
		}

		if (node instanceof Shape3D)
		{
			final Shape3D shape = (Shape3D) node;
			PickTool.setCapabilities(shape, PickTool.INTERSECT_FULL);
			for (final Enumeration groups = shape.getAllGeometries(); groups
					.hasMoreElements();)
			{
				final Geometry geometry = (Geometry) groups.nextElement();
				geometry.setCapability(Geometry.ALLOW_INTERSECT);
			}
		}
	}
}