vivisidea/JPGToText.java

## JPGToText.java
package bilibili.tv;

import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.io.PrintWriter;

import javax.imageio.ImageIO;

/**
 * convert a jpeg file to character text file
 *
 * @author vivi
 *
 */
public class JPGToText {//@formatter:off
    private final static char[] ASCII_CHARS = { '#', '&', '$', '*', '+', ';', '.', ' ' };
    private final static String HTML_TEMP   ="<!DOCTYPE>"+
            "<html>"+
            "    <head>"+
            "        <meta charset=\"utf-8\">"+
            "        <style type=\"text/css\">"+
            "            body{"+
            "                font-family: monospace; "+
            "                font-size: %dpx; "+
            "                margin: 0 auto;"+
            "            }"+
            "        </style>"+
            "    </head>"+
            "    <body>"+
            "    <pre>%s</pre>"+
            "    </body>"+
            "</html>";//@formatter:on
//    private final static char[] ASCII_CHARS = { '0', '.', ';', '+', '*', '$', '&', '#' };

    /**
     *  |
     * -+---------x------------------->
     *  |
     *  |
     *  y
     *  |
     * @param inputFile input filename
     * @param charWidth will treat every charWidth*charHeight as a char
     * @param charHeight will treat every charWidth*charHeight as a char
     * @throws IOException
     */
    public static String jpgToTxt2(String inputFile, int charWidth, int charHeight) throws IOException {
        File f = new File(inputFile);
        BufferedImage image = ImageIO.read(f);
        int width = image.getWidth();
        int height = image.getHeight();
        int rgbArray[] = new int[width * height]; // 保存所有的像素
        image.getRGB(0, 0, width, height, rgbArray, 0, width);

        StringBuilder sb = new StringBuilder();
        for (int y = 0; y < height; y += charHeight) {
            for (int x = 0; x < width; x += charWidth) {
                int rgb = rgbArray[y * width + x];
                int r = (rgb >> 16) & 0x000000FF; // the format is 0xalpha,r,g,b
                int g = (rgb >> 8) & 0x000000FF;
                int b = rgb & 0x000000FF;
                int gray = (r * 19595 + g * 38469 + b * 7472) >> 16;
                int level = gray / (256 / ASCII_CHARS.length);
                sb.append(ASCII_CHARS[level]);

//                System.out.println(String.format("r%s,g%s,b%s,gray%s", r, g, b, gray));
            }
            sb.append("\n");
        }
        return sb.toString();
    }

    public static void main(String[] args) throws IOException {
        //        String input = "target/input.txt";
        //        String output = "target/output.jpg";
        //        txtToJpg(input, output, 320, 240, 4);

//        jpgToTxt("target/163693930.jpg", 1);
//        System.out.println("-=-------------------");
        String output = jpgToTxt2("target/163693930.jpg", 2, 4);
//        String output = jpgToTxt2("target/nerv.jpg", 1, 2);
//        String output = jpgToTxt2("target/1pixel.jpg", 1, 2);
//        jpgToTxt2("target/1pixel.jpg", 4, 6);
        String html = String.format(HTML_TEMP, 9, output);
        PrintWriter printWriter = new PrintWriter(new File("target/charpic.html"));
        printWriter.write(html);
        printWriter.close();

        BufferedImage image = new BufferedImage(320, 240, BufferedImage.TYPE_INT_RGB);
        Font f = new Font(Font.MONOSPACED, Font.PLAIN, 24);
        Graphics g = image.getGraphics();
        g.setColor(Color.WHITE);
        g.fillRect(0, 0, 320, 240);

        g.setColor(Color.BLACK);
        g.setFont(f);
        g.drawString("wq.Yang", 100, 100);
        g.dispose();
//        image.getGraphics().drawChars("abc".toCharArray(), 0, 0, 100, 100);
//        int width = image.getWidth();
//        int height = image.getHeight();
//        for (int y = 0; y < height; y++) {
//            for (int x = 0; x < width; x++) {
//                image.setRGB(x, y, 0x000000FF);
//                int rgb = image.getRGB(x, y);
////                System.out.println(rgb);
//            }
//        }
        ImageIO.write(image, "jpg", new File("target/1pixel.jpg"));
    }
}
	package bilibili.tv;

	import java.awt.Color;
	import java.awt.Font;
	import java.awt.Graphics;
	import java.awt.image.BufferedImage;
	import java.io.File;
	import java.io.IOException;
	import java.io.PrintWriter;

	import javax.imageio.ImageIO;

	/**
	* convert a jpeg file to character text file
	*
	* @author vivi
	*
	*/
	public class JPGToText {//@formatter:off
	private final static char[] ASCII_CHARS = { '#', '&', '$', '*', '+', ';', '.', ' ' };
	private final static String HTML_TEMP ="<!DOCTYPE>"+
	"<html>"+
	" <head>"+
	" <meta charset=\"utf-8\">"+
	" <style type=\"text/css\">"+
	" body{"+
	" font-family: monospace; "+
	" font-size: %dpx; "+
	" margin: 0 auto;"+
	" }"+
	" </style>"+
	" </head>"+
	" <body>"+
	" <pre>%s</pre>"+
	" </body>"+
	"</html>";//@formatter:on
	// private final static char[] ASCII_CHARS = { '0', '.', ';', '+', '*', '$', '&', '#' };

	/**
	* \|
	* -+---------x------------------->
	* \|
	* \|
	* y
	* \|
	* @param inputFile input filename
	* @param charWidth will treat every charWidth*charHeight as a char
	* @param charHeight will treat every charWidth*charHeight as a char
	* @throws IOException
	*/
	public static String jpgToTxt2(String inputFile, int charWidth, int charHeight) throws IOException {
	File f = new File(inputFile);
	BufferedImage image = ImageIO.read(f);
	int width = image.getWidth();
	int height = image.getHeight();
	int rgbArray[] = new int[width * height]; // 保存所有的像素
	image.getRGB(0, 0, width, height, rgbArray, 0, width);

	StringBuilder sb = new StringBuilder();
	for (int y = 0; y < height; y += charHeight) {
	for (int x = 0; x < width; x += charWidth) {
	int rgb = rgbArray[y * width + x];
	int r = (rgb >> 16) & 0x000000FF; // the format is 0xalpha,r,g,b
	int g = (rgb >> 8) & 0x000000FF;
	int b = rgb & 0x000000FF;
	int gray = (r * 19595 + g * 38469 + b * 7472) >> 16;
	int level = gray / (256 / ASCII_CHARS.length);
	sb.append(ASCII_CHARS[level]);

	// System.out.println(String.format("r%s,g%s,b%s,gray%s", r, g, b, gray));
	}
	sb.append("\n");
	}
	return sb.toString();
	}

	public static void main(String[] args) throws IOException {
	// String input = "target/input.txt";
	// String output = "target/output.jpg";
	// txtToJpg(input, output, 320, 240, 4);

	// jpgToTxt("target/163693930.jpg", 1);
	// System.out.println("-=-------------------");
	String output = jpgToTxt2("target/163693930.jpg", 2, 4);
	// String output = jpgToTxt2("target/nerv.jpg", 1, 2);
	// String output = jpgToTxt2("target/1pixel.jpg", 1, 2);
	// jpgToTxt2("target/1pixel.jpg", 4, 6);
	String html = String.format(HTML_TEMP, 9, output);
	PrintWriter printWriter = new PrintWriter(new File("target/charpic.html"));
	printWriter.write(html);
	printWriter.close();

	BufferedImage image = new BufferedImage(320, 240, BufferedImage.TYPE_INT_RGB);
	Font f = new Font(Font.MONOSPACED, Font.PLAIN, 24);
	Graphics g = image.getGraphics();
	g.setColor(Color.WHITE);
	g.fillRect(0, 0, 320, 240);

	g.setColor(Color.BLACK);
	g.setFont(f);
	g.drawString("wq.Yang", 100, 100);
	g.dispose();
	// image.getGraphics().drawChars("abc".toCharArray(), 0, 0, 100, 100);
	// int width = image.getWidth();
	// int height = image.getHeight();
	// for (int y = 0; y < height; y++) {
	// for (int x = 0; x < width; x++) {
	// image.setRGB(x, y, 0x000000FF);
	// int rgb = image.getRGB(x, y);
	//// System.out.println(rgb);
	// }
	// }
	ImageIO.write(image, "jpg", new File("target/1pixel.jpg"));
	}
	}