// ---------------------------------------
// Restricted Focus Viewer (RFV) Program
// Version 2.1
// Language: Java 2
// October, 2000
// Copyright (C) 2000  Anthony R. Jansen 
// ---------------------------------------

// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License
// as published by the Free Software Foundation; either version 2
// of the License, or (at your option) any later version.

// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.

// ---------------------------------------
// RFV_Image.java
//
// Class for drawing a static image in the
// RFV display window.
// ---------------------------------------

import java.awt.*;
import java.awt.image.*;

public class RFV_Image extends RFV_Display_Element implements ImageObserver {


	// Components needed to draw image
	// -------------------------------
	private	Image		image;
	private	Toolkit		toolkit;
	private MediaTracker	media_tracker;

	// Constructor which accepts the panel dimensions, an image
	// and a focus window - defaults to inactive
	// --------------------------------------------------------
	public RFV_Image(Toolkit tk, MediaTracker mt, String filename)
	{
		super(true, false);

		// Initialize class elements
		// -------------------------
		toolkit = tk;
		media_tracker = mt;
		loadImage(filename);
	}

	// Method to ensure the removal of the image when it is no longer needed
	// ---------------------------------------------------------------------
	public void finalize()
	{
		media_tracker.removeImage(image);
	}

	// Method for loading in the image
	// -------------------------------
	private void loadImage(String filename)
	{
		// Load the image
		// ---------------
		image = toolkit.getImage(filename);
		media_tracker.addImage(image, 0);

		// Wait for the image to complete loading 
		// --------------------------------------
		try {
			media_tracker.waitForID(0);
			if (media_tracker.isErrorID(0)) 
				RFV_Error.die(55, filename);
		}
		catch(InterruptedException e) {
			RFV_Error.die(56);
		}

		// Find dimensions of image
		// ------------------------
		width = image.getWidth(this);
		height = image.getHeight(this);
	}

	// Draws the image
	// ---------------
	public void draw(Graphics g)
	{
		g.drawImage(image, x_offset, y_offset, this);
	}

	// Required for the ImageObserver interface
	// ----------------------------------------
	public boolean imageUpdate(Image img, int flags, int xc, int yc, int w, int h)
	{
		return true;
	}

}