/*
 * [TestPanel.java]
 *
 * Summary: Test smooth scrolling.
 *
 * Copyright: (c) 1998-2017 Roedy Green, Canadian Mind Products, http://mindprod.com
 *
 * Licence: This software may be copied and used freely for any purpose but military.
 *          http://mindprod.com/contact/nonmil.html
 *
 * Requires: JDK 1.8+
 *
 * Created with: JetBrains IntelliJ IDEA IDE http://www.jetbrains.com/idea/
 *
 * Version History:
 *  1.0 2002-06-28 original.
 */
package com.mindprod.smooth;

import javax.swing.JFrame;
import javax.swing.JPanel;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Font;
import java.awt.FontMetrics;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.RenderingHints;
import java.awt.Toolkit;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.awt.image.BufferedImage;
import java.awt.image.MemoryImageSource;

/**
 * Test smooth scrolling.
 *
 * @author Roedy Green, Canadian Mind Products
 * @version 1.0 2002-06-28 original.
 * @since 2002-06-28
 */
public final class TestPanel extends JPanel implements Runnable
    {
    int w, h;

    Image image = null;

    int lastLine;      // Start position of the last line

    int[] imageData;     // Our image data.

    int[] buffer; // Will hold a single image line

    MemoryImageSource mis;

    public TestPanel()
        {
        super( false );
        w = 800;
        h = 900;
        lastLine = w * ( h - 1 );
        imageData = new int[ w * h ];
        buffer = new int[ w ];
        Font f = new Font( "Arial", Font.BOLD, 48 );
        BufferedImage bi =
                new BufferedImage( w, h, BufferedImage.TYPE_INT_RGB );
        Graphics g = bi.getGraphics();
        RenderingHints ANTI_ALIAS = new RenderingHints(
                RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON );
        Graphics2D g2d = null;
        if ( g instanceof Graphics2D )
            {
            g2d = ( Graphics2D ) g;
            g2d.addRenderingHints( ANTI_ALIAS );
            }
        g.setColor( Color.RED );
        g.fillRect( 0, 0, w, 168 );
        g.setColor( Color.BLUE );
        g.fillRect( 0, 168, w, h );
        g.setColor( Color.WHITE );
        g.setFont( f );
        FontMetrics fm = g.getFontMetrics();
        int strHeight = fm.getHeight();
        g.drawString( "AQUEDUCT", ( ( w - fm.stringWidth( "AQUEDUCT" ) ) / 2 ), strHeight );
        int y = strHeight + 168;
        for ( int i = 0; i < h / strHeight; i++ )
            {
            g.drawString(
                    i + "Now is the time for all good men to come to the aid of...", 10, y );
            y += strHeight;
            }
        bi.getRGB( 0, 0, w, h, imageData, 0, w );
        mis = new MemoryImageSource( w, h, imageData, 0, w );
        mis.setAnimated( true );
        image = Toolkit.getDefaultToolkit().createImage( mis );
        }

    public static void main( String[] args )
        {
        JFrame f = new JFrame();
        final TestPanel tp = new TestPanel();
        f.getContentPane().add( tp );
        f.pack();
        f.addWindowListener( new WindowAdapter()
            {
            public void windowClosing( WindowEvent we )
                {
                System.exit( 0 );
                }

            public void windowOpened( WindowEvent we )
                {
                new Thread( tp ).start();
                }
            } );
        f.setVisible( true );
        }

    public Dimension getPreferredSize()
        {
        return new Dimension( 800, 600 );
        }

    public void paintComponent( Graphics g )
        {
        g.drawImage( image, 0, 0, this );
        }

    public void run()
        {
        while ( true )
            {
            System.arraycopy( imageData, w * 168, buffer, 0, w );
            System.arraycopy( imageData, w + w * 168, imageData, w * 168, ( h - 168 ) * w - w );
            System.arraycopy( buffer, 0, imageData, lastLine - w, w );
            //            mis.newPixels();
            mis.newPixels( 0, 168, w, h );
            try
                {
                Thread.sleep( 55 );
                }
            catch ( InterruptedException ie )
                {
                }
            }
        }
    }