/******************************************************************
 * @(#) PolygonTest.java     1.0
 *
 * Copyright (c) 2002 John Miller
 * All Right Reserved
 *-----------------------------------------------------------------
 * Permission to use, copy, modify and distribute this software and
 * its documentation without fee is hereby granted provided that
 * this copyright notice appears in all copies.
 * WE MAKE 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. WE SHALL NOT BE
 * LIABLE FOR ANY DAMAGES SUFFERED BY ANY USER AS A RESULT OF USING,
 * MODIFYING OR DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES.
 *-----------------------------------------------------------------
 *
 * @version     1.0, 6 Mar 2002
 * @author      John Miller
 */

import java.awt.*;
import java.awt.geom.*;
import javax.swing.*;

import static java.lang.Math.PI;
import static java.lang.System.*;

/******************************************************************
 * The PolygonTest class tests the Polygon class by moving/walking
 * a polygon and alternatively drawing and filling it.
 */
public class PolygonTest extends JFrame
                         implements Runnable
{
    private static final int       STEP = 10;
    private static final Dimension DIM  = new Dimension (600, 600);

    private final Thread  displayer;
    private boolean       fillFlag;
    private int           sign;
    private Point2D       pos;
    private Polygon       poly;

    /**************************************************************
     * The DisplayPanel inner class is used to place shapes in the
     * drawing region.
     */
    public class DisplayPanel extends JPanel
    {
        /**********************************************************
         * Paint the display panel component.
         * @param  gr  Graphics context.
         */
        public void paintComponent (Graphics gr)
        {
           super.paintComponent (gr);
           Graphics2D gr2 = (Graphics2D) gr;

           if (fillFlag) {
               gr2.translate (pos.getX (), pos.getY ());
               gr2.setPaint (Color.red);
               gr2.fill (poly);
           } else {
               sign *= -1;
               gr2.rotate (sign * PI / 12., pos.getX () + 50, pos.getY () + 50);
               gr2.translate (pos.getX (), pos.getY ());
               gr2.setPaint (Color.blue);
               gr2.draw (poly);
           } // if
        } // paintComponent

    } // DisplayPanel inner class

    /**************************************************************
     * Construct a frame.
     * @param  title  Title of frame
     */
    public PolygonTest (String title)
    {
        super (title);
        setDefaultCloseOperation (JFrame.EXIT_ON_CLOSE);

        Point2D [] corner = { new Point2D.Double (0, 0),
                              new Point2D.Double (100, 0),
                              new Point2D.Double (0, 100) };

        fillFlag = false;
        sign     = 1;
        pos      = new Point2D.Double (100, 100);
        poly     = new Polygon (corner);

        getContentPane ().add (new DisplayPanel ());
        setLocation (100, 100);
        setSize (DIM);
        setVisible (true);
        displayer = new Thread (this, "displayer");
        displayer.start ();
    } // PolygonTest

    /**************************************************************
     * Run method for the display thread.
     * Repeatedly update coordinates, sleep and repaint.
     */
    public void run ()
    {
        for (int i = 0; i < 40; i++) {

            fillFlag = ! fillFlag;
            pos.setLocation (pos.getX () + STEP, pos.getY () + STEP);

            out.println (" pos = ( " + pos.getX () + " , " + pos.getY () + " ) ");

            try {
                displayer.sleep (1000);
            } catch (InterruptedException ex) {
                err.println ("PolygonTest.run: sleep failed");
            } // try

            repaint ();

        } // for
    } // run

    /**************************************************************
     * Main method for invoking the application.
     * @param  args  Command-line arguments
     */
    public static void main (String [] args)
    {
        PolygonTest frame = new PolygonTest ("PolygonTest");
    } // main


} // PolygonTest class