Epson位图ESC代码中心图像

Question

以下是我迄今为止设置的

http://nicholas.piasecki.name/blog/2009/12/sending-a-bit-image-to-an-epson-tm-t88iii-receipt-printer-using-c-and-escpos/

我遵循了这个指南，现在我可以在收据打印机上打印位图图像了。

但现在我会在收据打印机上将图像居中，似乎可以理解如何在他的代码中实现这一点。有人能帮我找出在哪里插入空格来实现这一点吗？

以下是从代码中提取的写入位阵列部分：

    bw.Write(AsciiControlChars.Newline);
    bw.Write("                 Hello World!");
    bw.Write(AsciiControlChars.Newline);
    bw.Write("          "); 

^^^此bw.Write（"）；将第一行移到

    // So we have our bitmap data sitting in a bit array called "dots."
    // This is one long array of 1s (black) and 0s (white) pixels arranged
    // as if we had scanned the bitmap from top to bottom, left to right.
    // The printer wants to see these arranged in bytes stacked three high.
    // So, essentially, we need to read 24 bits for x = 0, generate those
    // bytes, and send them to the printer, then keep increasing x. If our
    // image is more than 24 dots high, we have to send a second bit image
    // command.
    // Set the line spacing to 24 dots, the height of each "stripe" of the
    // image that we're drawing.
    bw.Write(AsciiControlChars.Escape);
    bw.Write('3');
    bw.Write((byte)24);
    // OK. So, starting from x = 0, read 24 bits down and send that data
    // to the printer.
    int offset = 0;
    while (offset < data.Height)
    {
        bw.Write(AsciiControlChars.Escape);
        bw.Write('*');         // bit-image mode
        bw.Write((byte)33);    // 24-dot double-density
        bw.Write(width[0]);  // width low byte
        bw.Write(width[1]);  // width high byte
        for (int x = 0; x < data.Width; ++x)
        {
            for (int k = 0; k < 3; ++k)
            {
                byte slice = 0;
                for (int b = 0; b < 8; ++b)
                {
                    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 * data.Width) + x;
                    // If the image is shorter than 24 dots, pad with zero.
                    bool v = false;
                    if (i < dots.Length)
                    {
                        v = dots[i];
                    }
                    slice |= (byte)((v ? 1 : 0) << (7 - b));
                }
                bw.Write(slice);
            }
        }
        offset += 24;
        bw.Write(AsciiControlChars.Newline);
    }
    // Restore the line spacing to the default of 30 dots.
    bw.Write(AsciiControlChars.Escape);
    bw.Write('3');
    bw.Write((byte)30);
    bw.Write("Text Is awsome");
    bw.Write(AsciiControlChars.Newline);
}

Answer 1

基本上，问题是因为我们调用了位图图像模式，所以我们插入的任何空间都没有真正向流中添加任何空间，所以为了解决这个问题，你必须在垂直循环中关闭位图图像模式并添加空间，然后简单地将模式切换回位图图像模式。