/*
 * Copyright (c) 1995, 1996 Sun Microsystems, Inc. All Rights Reserved.
 *
 * Permission to use, copy, modify, and distribute this software
 * and its documentation for NON-COMMERCIAL purposes and without
 * fee is hereby granted provided that this copyright notice
 * appears in all copies. Please refer to the file "copyright.html"
 * for further important copyright and licensing information.
 *
 * SUN MAKES NO REPRESENTATIONS OR WARRANTIES ABOUT THE SUITABILITY OF
 * THE SOFTWARE, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
 * TO THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
 * PARTICULAR PURPOSE, OR NON-INFRINGEMENT. SUN SHALL NOT BE LIABLE FOR
 * ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
 * DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES.
 */
import java.awt.*;
import java.applet.Applet;

/* 
 * This displays a framed area.  When the user clicks within
 * the area, this program displays a dot and a string indicating
 * the coordinates where the click occurred.
 */

public class CoordinatesDemo extends Applet {
    FramedArea framedArea;
    Label label;

    public void init() {
	GridBagLayout gridBag = new GridBagLayout();
	GridBagConstraints c = new GridBagConstraints();

	setLayout(gridBag);

	framedArea = new FramedArea(this);
	c.fill = GridBagConstraints.BOTH;
	c.weighty = 1.0;
	c.gridwidth = GridBagConstraints.REMAINDER; //end row
	gridBag.setConstraints(framedArea, c);
	add(framedArea);

	label = new Label("Click within the framed area.");
	c.fill = GridBagConstraints.HORIZONTAL;
	c.weightx = 1.0;
	c.weighty = 0.0;
	gridBag.setConstraints(label, c);
	add(label);

	validate();
    }

    public void coordsChanged(Point point) {
	label.setText("Click occurred at coordinate ("
		      + point.x + ", " + point.y + ").");
	repaint();
    }
}

/* This class exists solely to put a frame around the coordinate area. */
class FramedArea extends Panel {
    public FramedArea(CoordinatesDemo controller) {
	super();

	//Set layout to one that makes its contents as big as possible.
	setLayout(new GridLayout(1,0));

	add(new CoordinateArea(controller));
	validate();
    }

    public Insets insets() {
	return new Insets(4,4,5,5);
    }

    public void paint(Graphics g) {
        Dimension d = size();
        Color bg = getBackground();
 
        g.setColor(bg);
        g.draw3DRect(0, 0, d.width - 1, d.height - 1, true);
        g.draw3DRect(3, 3, d.width - 7, d.height - 7, false);
    }
}

class CoordinateArea extends Canvas {
    Point point = null;
    CoordinatesDemo controller;

    public CoordinateArea(CoordinatesDemo controller) {
	super();
	this.controller = controller;
    }

    public boolean mouseDown(Event event, int x, int y) {
	if (point == null) {
	    point = new Point(x, y);
	} else {
            point.x = x;
            point.y = y;
	}
	controller.coordsChanged(point);
	repaint();

	return false;
    }

    public void paint(Graphics g) {
	//If user has chosen a point, paint a tiny rectangle on top.
	if (point != null) {
	    g.fillRect(point.x - 1, point.y - 1, 2, 2);
	}
    }
}