我目前正在开发一款使用ZXing生成QR码作为图片的应用。这是一个简单的例子:
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import com.google.zxing.BarcodeFormat;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.WriterException;
import com.google.zxing.client.j2se.MatrixToImageWriter;
import com.google.zxing.common.BitMatrix;
public class MyQREncoder {
/**
* @param args
* @throws WriterException
* @throws IOException
* @throws FileNotFoundException
*/
public static void main(String[] args) throws WriterException, FileNotFoundException, IOException {
String text = "Some text to encode";
int width = 300;
int height = 300;
BitMatrix bitMatrix = new MultiFormatWriter().encode(text, BarcodeFormat.QR_CODE,width,height);
String file = "plop.png";
String format = "png";
MatrixToImageWriter.writeToStream(bitMatrix, format, new FileOutputStream(new File(file)));
}
}
这会生成一个PNG文件,其中包含可扫描的QRcode,上面写着“要编码的某些文字”。
我的问题是,如果我尝试将格式更改为eps,那么我将获得一个空文件。我们使用的当前解决方案是通过imagemagick转换实用程序将png文件转换为eps。但是给定的EPS只是嵌入原始图像,并且不能很好地扩展(特别是在打印时)。
有人知道是否有任何开源解决方案(使用Zxing或其他)来构建可扩展的Eps文件? (或任何矢量格式)
答案 0 :(得分:4)
编辑:这是一个完整的Java解决方案:
PrintStream psFile = /* Open file */;
final int blockSize = 4;
psFile.println("%!PS-Adobe-3.0 EPSF-3.0");
psFile.println("%%BoundingBox: 0 0 " + bitMatrix.getWidth() * blockSize + " " + bitMatrix.getHeight() * blockSize);
psFile.print("/bits [");
for(int y = 0; y < bitMatrix.getHeight(); ++y) {
for(int x = 0; x < bitMatrix.getWidth(); ++x) {
psFile.print(bitMatrix.get(x, y) ? "1 " : "0 ");
}
}
psFile.println("] def");
psFile.println("/width " + bitMatrix.getWidth() + " def");
psFile.println("/height " + bitMatrix.getHeight() + " def");
psFile.println(
"/y 0 def\n" +
blockSize + " " + blockSize + " scale\n" +
"height {\n" +
" /x 0 def\n" +
" width {\n" +
" bits y width mul x add get 1 eq {\n" +
" newpath\n" +
" x y moveto\n" +
" 0 1 rlineto\n" +
" 1 0 rlineto\n" +
" 0 -1 rlineto\n" +
" closepath\n" +
" fill\n" +
" } if\n" +
" /x x 1 add def\n" +
" } repeat\n" +
" /y y 1 add def\n" +
"} repeat\n");
psFile.close();
如何自己生成PS文件?像这样:
%!PS-Adobe-3.0 EPSF-3.0
%%BoundingBox: 0 0 288 288
/bits [0 0 1 0 1 0 1 1 0 1 1 0 1 1 0 0] def
/width 4 def
/height 4 def
/y 0 def
72 72 scale
height {
/x 0 def
width {
bits y width mul x add get 1 eq {
newpath
x y moveto
0 1 rlineto
1 0 rlineto
0 -1 rlineto
closepath
fill
} if
/x x 1 add def
} repeat
/y y 1 add def
} repeat
(当然,你可以在顶部用自己的值填写defs,迭代BitMatrix并打印1和0来填充bits
)