/**
	Company:		Shout3D LLC
	Project:		Shout3D Core
	Class:			ScreenBoxPickerEffect
	Date:			November 9, 2000
	Description:	Picks the object under the cursor and draws a screenspace box around it.
	(C) Copyright Shout3D LLC. - 1997-2001 - All rights reserved
 */

package custom_nodes;

import shout3d.core.*;
import shout3d.*;
import shout3d.core.awt.*;
import java.awt.*;
import java.awt.image.*;

/**
 * ScreenBoxPickerEffect
 *
 * @author Paul Isaacs
 * @author Jim Stewartson
 * @author Hugues Labbe
 *
 */

public class ScreenBoxPickerEffect extends PostRenderEffect implements DeviceObserver
{
	Picker picker;
	int x;
	int y;
	boolean mouseIsInPanel = false;

	/**
	 * Constructs a default DEFNamePickerEffect node.
	 */
	public ScreenBoxPickerEffect()
	{
		super();
	}

	/**
	 * When the viewer is set, register with it to receive DeviceInput.
	 */
	public void setViewer(Shout3DViewer v) {
		// Unregister with old viewer
		if (getViewer() != null)
			getViewer().getDeviceListener().removeDeviceObserver(this, "MouseInput");
		// Change viewers.
		// Must call this or the basic setViewer() functionality from super classes is lost
		super.setViewer(v);
		// Register with new viewer
		if (getViewer() != null) {
			getViewer().getDeviceListener().addDeviceObserver(this, "MouseInput", null);
			picker = getViewer().getNewPicker();
		}
	}

	public boolean onDeviceInput(DeviceInput di, Object userData)
	{
		if ( !(di instanceof MouseInput))
			return false;

		MouseInput mi = (MouseInput)di;
		switch (mi.which) {
			case MouseInput.DOWN:
			case MouseInput.DRAG:
			case MouseInput.MOVE:
				x = mi.x;
				y = mi.y;
				mouseIsInPanel = true;
				break;
			case MouseInput.ENTER:
				mouseIsInPanel = true;
				break;
			case MouseInput.EXIT:
				mouseIsInPanel = false;
				break;
			default:
				break;
		}
		return false;
	}

	public void filter(Graphics g, int surface_pixel_bits[], float z_buffer[], int deviceWidth, int deviceHeight)
	{
		if (mouseIsInPanel) {
			Node[] node = picker.pickClosest(x, y);
			if (node == null)
				return;

			// Get the screen space bounds of the selection:
			float[] bounds = { 0, 0, 0, 0 };
			if (picker.getProjectedBounds(node,false, bounds)){
				g.drawRect((int)bounds[0], (int)bounds[1], (int)(bounds[2]-bounds[0]+1), (int)(bounds[3]-bounds[1]+1));
			}
		}
    }
}