Imprimer bitmap pleine largeur de page dans l'imprimante à points thermiques en utilisant ESC / POS en java


J'essaie d'imprimer une image de 576 pixels de largeur dans une imprimante thermique qui prend en charge les commandes ESC, le problème est que la commande "ESC *" pour imprimer des bits d'image ne me permet d'imprimer que des images de 255 pixels de largeur (si j'utilise une image de 576 pixels, certaines parties sont imprimées et le reste]}

ESC * m nL nH d1Ödk
Name Specify bit image mode 
Code ASCII ESC * m nL nHd1...dk 
 Hex. 1B 2A m nL nHd1...dk 
 Decimal 27 42 m nL nHd1...dk 
Defined Region m = 0,1,32,33 
 0 ≤ nL ≤ 255 
 0 ≤ nH ≤ 3 
 0 ≤ d ≤ 255 

Donc je ne sais pas comment imprimer une image qui est la largeur maximale de la page de l'imprimante (576 px), je avoir ce code qui imprime l'image:

public class ESCPOSApi {

    private final byte[] INITIALIZE_PRINTER = new byte[]{0x1B,0x40};

    private final byte[] PRINT_AND_FEED_PAPER = new byte[]{0x0A};

    private final byte[] SELECT_BIT_IMAGE_MODE = new byte[]{(byte)0x1B, (byte)0x2A};
    private final byte[] SET_LINE_SPACING = new byte[]{0x1B, 0x33};

    private FileOutputStream printOutput;

    public int maxBitsWidth = 255;

    public ESCPOSApi(String device) {
        try {
            printOutput = new FileOutputStream(device);
        } catch (FileNotFoundException ex) {
            Logger.getLogger(ESCPOSApi.class.getName()).log(Level.SEVERE, null, ex);
        }
    }

    private byte[] buildPOSCommand(byte[] command, byte... args) {
        byte[] posCommand = new byte[command.length + args.length];

        System.arraycopy(command, 0, posCommand, 0, command.length);
        System.arraycopy(args, 0, posCommand, command.length, args.length);

        return posCommand;
    }

    private BitSet getBitsImageData(BufferedImage image) {
        int threshold = 127;
        int index = 0;
        int dimenssions = image.getWidth() * image.getHeight();
        BitSet imageBitsData = new BitSet(dimenssions);

        for (int y = 0; y < image.getHeight(); y++)
        {
            for (int x = 0; x < image.getWidth(); x++)
            {
                int color = image.getRGB(x, y);
                int  red = (color & 0x00ff0000) >> 16;
                int  green = (color & 0x0000ff00) >> 8;
                int  blue = color & 0x000000ff;
                int luminance = (int)(red * 0.3 + green * 0.59 + blue * 0.11);
                //dots[index] = (luminance < threshold);
                imageBitsData.set(index, (luminance < threshold));
                index++;
            }
        }

        return imageBitsData;
    }

    public void printImage(BufferedImage image) {
        try {
            BitSet imageBits = getBitsImageData(image);

            byte widthLSB = (byte)(image.getWidth() & 0xFF);
            byte widthMSB = (byte)((image.getWidth() >> 16) & 0xFF);

            // COMMANDS
            byte[] selectBitImageModeCommand = buildPOSCommand(SELECT_BIT_IMAGE_MODE, (byte) 33, widthLSB, widthMSB);
            byte[] setLineSpacing24Dots = buildPOSCommand(SET_LINE_SPACING, (byte) 24);
            byte[] setLineSpacing30Dots = buildPOSCommand(SET_LINE_SPACING, (byte) 30);


            printOutput.write(INITIALIZE_PRINTER);
            printOutput.write(setLineSpacing24Dots);

            int offset = 0;
            while (offset < image.getHeight()) {
                printOutput.write(selectBitImageModeCommand);

                int imageDataLineIndex = 0;
                byte[] imageDataLine = new byte[3 * image.getWidth()];

                for (int x = 0; x < image.getWidth(); ++x) {

                    // Remember, 24 dots = 24 bits = 3 bytes.
                    // The 'k' variable keeps track of which of those
                    // three bytes that we're currently scribbling into.
                    for (int k = 0; k < 3; ++k) {
                        byte slice = 0;

                        // A byte is 8 bits. The 'b' variable keeps track
                        // of which bit in the byte we're recording.
                        for (int b = 0; b < 8; ++b) {
                            // Calculate the y position that we're currently
                            // trying to draw. We take our offset, divide it
                            // by 8 so we're talking about the y offset in
                            // terms of bytes, add our current 'k' byte
                            // offset to that, multiple by 8 to get it in terms
                            // of bits again, and add our bit offset to it.
                            int y = (((offset / 8) + k) * 8) + b;

                            // Calculate the location of the pixel we want in the bit array.
                            // It'll be at (y * width) + x.
                            int i = (y * image.getWidth()) + x;

                            // If the image (or this stripe of the image)
                            // is shorter than 24 dots, pad with zero.
                            boolean v = false;
                            if (i < imageBits.length()) {
                                v = imageBits.get(i);
                            }
                            // Finally, store our bit in the byte that we're currently
                            // scribbling to. Our current 'b' is actually the exact
                            // opposite of where we want it to be in the byte, so
                            // subtract it from 7, shift our bit into place in a temp
                            // byte, and OR it with the target byte to get it into there.
                            slice |= (byte) ((v ? 1 : 0) << (7 - b));
                        }

                        imageDataLine[imageDataLineIndex + k] = slice;

                        // Phew! Write the damn byte to the buffer
                        //printOutput.write(slice);
                    }

                    imageDataLineIndex += 3;
                }

                printOutput.write(imageDataLine);
                offset += 24;
                printOutput.write(PRINT_AND_FEED_PAPER);
            }


            printOutput.write(setLineSpacing30Dots);
        } catch (IOException ex) {
            Logger.getLogger(ESCPOSApi.class
                    .getName()).log(Level.SEVERE, null, ex);
        }
    }
}

Je veux utiliser une double densité de 24 points mais pour l'instant j'utilise une densité de sigle de 24 points avec des images de 255 pixels (cela me permet d'imprimer des images en pleine largeur de page mais j'ai besoin d'une double densité)

1 answers

Dans le code ci-dessus,

Image.getWidth () > > 16 --- devrait être ">> 8". 8 bits par octet.

 10
Author: joeking, 2014-10-09 23:18:34