TestImage2.java Source code

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Here is the source code for TestImage2.java

Source

//-----------------------------------------------------------------------//
//                                                                       //
//                           T e s t I m a g e 2                         //
//                                                                       //
//  Copyright (C) Herve Bitteur 2000-2007. All rights reserved.          //
//  This software is released under the terms of the GNU General Public  //
//  License. Please contact the author at herve.bitteur@laposte.net      //
//  to report bugs & suggestions.                                        //
//-----------------------------------------------------------------------//

import java.awt.BorderLayout;
import java.awt.Container;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.geom.AffineTransform;
import java.awt.image.BufferedImage;
import java.awt.image.DataBuffer;
import java.awt.image.DataBufferByte;
import java.awt.image.Raster;
import java.awt.image.RenderedImage;
import java.awt.image.WritableRaster;
import javax.swing.JFrame;
import javax.swing.JPanel;

public class TestImage2 extends JPanel {
    //RenderedImage image;
    RenderedImage image;

    // Affine tranform
    final float ratio = 1f;
    AffineTransform scaleXform = AffineTransform.getScaleInstance(ratio, ratio);

    private static char WHITE = '-'; // And transparent
    private static char[] charTable = new char[] { '#', // 0 Black
            '$', // 1
            '*', // 2
            '0', // 3
            'o', // 4
            '+', // 5
            '.', // 6
            WHITE // 7
    };

    //------------//
    // TestImage2 //
    //------------//
    public TestImage2() {
        JFrame frame = new JFrame(getClass().getName());
        Container pane = frame.getContentPane();
        pane.setLayout(new BorderLayout());

        pane.add(this);

        image = toRenderedImage(
                new String[] { "-##########################################################################-",
                        "----------------------------------------------------------------------------",
                        "-##########################################################################-",
                        "----------------------------------------------------------------------------",
                        "-##########################################################################-",
                        "----------------------------------------------------------------------------",
                        "-##########################################################################-",
                        "----------------------------------------------------------------------------",
                        "-##########################################################################-",
                        "----------------------------------------------------------------------------",
                        "-##########################################################################-",
                        "----------------------------------------------------------------------------",
                        "----------------------------------------------------------------------------",
                        "----------------------------------------------------------------------------",
                        "----####---------------####---------------####---------------####-----------",
                        "--------##-----------------##-----------------##-----------------##---------",
                        "----------####---------------####---------------####---------------####-----",
                        "--------------#------------------#------------------#------------------#----",
                        "--------------#------------------#------------------#------------------#----",
                        "----------------------------------------------------------------------------",
                        "---#############------#############------#############------#############---",
                        "---#############------#############------#############------#############---",
                        "---#############------#############------#############------#############---",
                        "---#############------#############------#############------#############---",
                        "---#############------#############------#############------#############---",
                        "---#############------#############------#############------#############---",
                        "---#############------#############------#############------#############---",
                        "---#############------#############------#############------#############---",
                        "---#############------#############------#############------#############---",
                        "---#############------#############------#############------#############---",
                        "---#############------#############------#############------#############---",
                        "----------------------------------------------------------------------------",
                        "----------------------------------------------------------------------------",
                        "----####---------------####---------------####---------------####-----------",
                        "--------##-----------------##-----------------##-----------------##---------",
                        "----------####---------------####---------------####---------------####-----",
                        "--------------#------------------#------------------#------------------#----",
                        "--------------#------------------#------------------#------------------#----",
                        "----------------------------------------------------------------------------",
                        "---#############------#############------#############------#############---",
                        "---#############------#############------#############------#############---",
                        "----------------------------------------------------------------------------",
                        "----------------------------------------------------------------------------" });

        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setLocation(100, 100);
        frame.pack();
        frame.setSize(200, 200);
        frame.setVisible(true);
    }

    //------//
    // main //
    //------//
    public static void main(String... args) {
        new TestImage2();
    }

    //----------------//
    // paintComponent //
    //----------------//
    public void paintComponent(Graphics g) {
        // For background
        super.paintComponent(g);

        // Meant for visual check
        if (image != null) {

            Graphics2D g2 = (Graphics2D) g;

            g2.drawRenderedImage(image, scaleXform);
            //g2.drawImage (image, 1, 1, this);
        }
    }

    //-----------------//
    // toRenderedImage //
    //-----------------//
    public static RenderedImage toRenderedImage(String[] rows) {
        // Create the DataBuffer to hold the pixel samples
        final int width = rows[0].length();
        final int height = rows.length;
        final int size = width * height;
        byte[] pixels = new byte[size];
        int index = 0;
        for (String row : rows) {
            for (int x = 0; x < width; x++) {
                pixels[index++] = (byte) decodeGray(row.charAt(x));
            }
        }
        DataBuffer dataBuffer = new DataBufferByte(pixels, size);

        // Create Raster
        WritableRaster writableRaster = Raster.createBandedRaster(dataBuffer, width, height, width, // scanlineStride
                new int[] { 0 }, // bankIndices,
                new int[] { 0 }, // bandOffsets,
                null); // location

        // Create the image
        BufferedImage bufferedImage = new BufferedImage(width, height, BufferedImage.TYPE_BYTE_GRAY);
        bufferedImage.setData(writableRaster);

        return bufferedImage;
    }

    //------------//
    // decodeGray //
    //------------//
    private static int decodeGray(char c) {
        // Check the char
        if (c == WHITE) {
            return 255;
        } else {
            for (int i = charTable.length - 1; i >= 0; i--) {
                if (charTable[i] == c) {
                    int level = 2 + i * 36; // Range 2 .. 254 (not too bad)
                    return level;
                }
            }
        }

        // Unknown -> white
        return 255;
    }
}