/*

 * Copyright (c) 1997, 2011, Oracle and/or its affiliates. All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 *

 *   - Redistributions of source code must retain the above copyright

 *     notice, this list of conditions and the following disclaimer.

 *

 *   - Redistributions in binary form must reproduce the above copyright

 *     notice, this list of conditions and the following disclaimer in the

 *     documentation and/or other materials provided with the distribution.

 *

 *   - Neither the name of Oracle nor the names of its

 *     contributors may be used to endorse or promote products derived

 *     from this software without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS

 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,

 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR

 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,

 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,

 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR

 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF

 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING

 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS

 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 */

/*

 * This source code is provided to illustrate the usage of a given feature

 * or technique and has been deliberately simplified. Additional steps

 * required for a production-quality application, such as security checks,

 * input validation and proper error handling, might not be present in

 * this sample code.

 */

/**

 * I love blinking things.

 *

 * @author Arthur van Hoff

 * @author 04/24/96 Jim Hagen use getBackground

 * @author 02/05/98 Mike McCloskey removed use of deprecated methods

 * @author 04/23/99 Josh Bloch, use timer instead of explicit multithreading.

 * @author 07/10/00 Daniel Peek brought to code conventions, minor changes

 */

import java.awt.Color;

import java.awt.Dimension;

import java.awt.Font;

import java.awt.FontMetrics;

import java.awt.Graphics;

import java.util.StringTokenizer;

import java.util.Timer;

import java.util.TimerTask;

public class Blink extends java.applet.Applet {

    private static final long serialVersionUID = -775844794477507646L;

    private Timer timer;              // Schedules the blinking

    private String labelString;       // The label for the window

    private int delay;                // the delay time between blinks

    @Override

    public void init() {

        String blinkFrequency = getParameter("speed");

        delay = (blinkFrequency == null) ? 400

                : (1000 / Integer.parseInt(blinkFrequency));

        labelString = getParameter("lbl");

        if (labelString == null) {

            labelString = "Blink";

        }

        Font font = new java.awt.Font("Serif", Font.PLAIN, 24);

        setFont(font);

    }

    @Override

    public void start() {

        timer = new Timer();     //creates a new timer to schedule the blinking

        timer.schedule(new TimerTask() {      //creates a timertask to schedule

            // overrides the run method to provide functionality

            @Override

            public void run() {

                repaint();

            }

        }, delay, delay);

    }

    @Override

    public void paint(Graphics g) {

        int fontSize = g.getFont().getSize();

        int x = 0, y = fontSize, space;

        int red = (int) (50 * Math.random());

        int green = (int) (50 * Math.random());

        int blue = (int) (256 * Math.random());

        Dimension d = getSize();

        g.setColor(Color.black);

        FontMetrics fm = g.getFontMetrics();

        space = fm.stringWidth(" ");

        for (StringTokenizer t = new StringTokenizer(labelString);

                t.hasMoreTokens();) {

            String word = t.nextToken();

            int w = fm.stringWidth(word) + space;

            if (x + w > d.width) {

                x = 0;

                y += fontSize;  //move word to next line if it doesn't fit

            }

            if (Math.random() < 0.5) {

                g.setColor(new java.awt.Color((red + y * 30) % 256,

                        (green + x / 3) % 256, blue));

            } else {

                g.setColor(getBackground());

            }

            g.drawString(word, x, y);

            x += w;  //shift to the right to draw the next word

        }

    }

    @Override

    public void stop() {

        timer.cancel();  //stops the timer

    }

    @Override

    public String getAppletInfo() {

        return "Title: Blinker\n"

                + "Author: Arthur van Hoff\n"

                + "Displays multicolored blinking text.";

    }

    @Override

    public String[][] getParameterInfo() {

        String pinfo[][] = {

            { "speed", "string", "The blink frequency" },

            { "lbl", "string", "The text to blink." }, };

        return pinfo;

    }

}