iText paragraph.setRotationAngle 更改文本方向

Question

我正在尝试向 PDF 文件添加一些垂直文本，但是当我使用 setRotationAngle 旋转我的段落时，每 space 变成一个换行符或文本方向改变，我不确定.图片显示了我期望的结果和我得到的结果。我在 NetBeans 12.3 上使用 iText 7.1.0。

Result I want

Result I get

这是我的完整代码

import com.itextpdf.kernel.geom.Rectangle;
import com.itextpdf.kernel.pdf.PdfDocument;
import com.itextpdf.kernel.pdf.PdfReader;
import com.itextpdf.kernel.pdf.PdfWriter;
import com.itextpdf.kernel.pdf.PdfPage;
import com.itextpdf.kernel.pdf.PdfName;
import com.itextpdf.kernel.pdf.PdfNumber;
import com.itextpdf.kernel.pdf.action.PdfAction;
import com.itextpdf.kernel.pdf.annot.PdfAnnotation;
import com.itextpdf.kernel.pdf.annot.PdfLinkAnnotation;
import com.itextpdf.kernel.pdf.annot.PdfStampAnnotation;
import com.itextpdf.io.font.constants.StandardFonts;
import com.itextpdf.kernel.font.PdfFont;
import com.itextpdf.kernel.font.PdfFontFactory;
import com.itextpdf.kernel.geom.Rectangle;
import com.itextpdf.kernel.pdf.PdfDocument;
import com.itextpdf.kernel.pdf.PdfPage;
import com.itextpdf.kernel.pdf.PdfWriter;
import com.itextpdf.kernel.pdf.canvas.PdfCanvas;
import com.itextpdf.layout.Canvas;
import com.itextpdf.layout.element.Paragraph;
import com.itextpdf.layout.element.Text;

import java.io.File;
import java.io.IOException;
import java.lang.Math;


public class assinatura {
    public static void main(String args[]) throws IOException {
        System.out.println("Assinando documento");
        assinar("hello.pdf", "first string", "second text");
    }

    public static void assinar(String documento, String txtAssinaturaA, String txtAssinaturaB) throws IOException {
        //Initialize PDF document
        PdfDocument pdf = new PdfDocument(new PdfReader(documento),
                                          new PdfWriter(documento + "_assinado.pdf"));
        
        PdfPage primeiraPag = pdf.getFirstPage();

        PdfCanvas pdfCanvas = new PdfCanvas(primeiraPag);
        Rectangle rectangle = new Rectangle(550, 0, 550, 400);
        pdfCanvas.rectangle(rectangle);
        Canvas canvas = new Canvas(pdfCanvas, pdf, rectangle);
        PdfFont font = PdfFontFactory.createFont(StandardFonts.TIMES_ROMAN);
        Text txtA = new Text(txtAssinaturaA)
            .setFont(font)
            .setFontSize(10)
            .setFontColor(ColorConstants.BLUE);
        Text txtB = new Text(txtAssinaturaB)
            .setFont(font)
            .setFontSize(10)
            .setFontColor(ColorConstants.BLUE);
        
        Paragraph paragrafoA = new Paragraph().add(txtA);
        Paragraph paragrafoB = new Paragraph().add(txtB);
        paragrafoA.setRotationAngle(Math.toRadians(90));
        paragrafoB.setRotationAngle(Math.toRadians(90));

        canvas.add(paragrafoA);
        canvas.add(paragrafoB);
        canvas.close();
        pdf.close();

    }
}```

Answer 1

尝试下面的代码，它将按预期工作 showTextAligned 是一种编写关于指定点对齐的文本的便捷方法

document.showTextAligned(paragrafoA.setFontColor(Color.BLUE), x, y , 1, TextAlignment.RIGHT, VerticalAlignment.TOP, (float) Math.PI / 2f);
     document.showTextAligned(paragrafoB.setFontColor(Color.BLUE), x+20, y , 1,
              TextAlignment.RIGHT, VerticalAlignment.TOP, (float) Math.PI / 2f);

完整代码

public static  void assinar(String documento, String txtAssinaturaA, String txtAssinaturaB) throws IOException {
      //Initialize PDF document
      PdfWriter pdfwriter=new PdfWriter(documento + "_assinado.pdf");
      PdfDocument pdfDocument = new PdfDocument(new PdfReader(documento),pdfwriter);
      pdfDocument.setDefaultPageSize(PageSize.A4);
      Document document=new Document(pdfDocument);

      //PdfFont font = PdfFontFactory.createFont(StandardFonts.TIMES_ROMAN);
      Text txtA = new Text(txtAssinaturaA)
              .setFontSize(10)
              .setFontColor(Color.BLUE);
      Text txtB = new Text(txtAssinaturaB)
              .setFontSize(10)
              .setFontColor(Color.BLUE);
    Paragraph paragrafoA = new Paragraph().add(txtA);
  Paragraph paragrafoB = new Paragraph().add(txtB);
//here x and y is poinying to center so change 
      float x = pdfDocument.getDefaultPageSize().getWidth() / 2;
      float y = pdfDocument.getDefaultPageSize().getHeight() / 2;
   document.showTextAligned(paragrafoA.setFontColor(Color.BLUE), x, y , 1, TextAlignment.RIGHT, VerticalAlignment.TOP, (float) Math.PI / 2f);
     document.showTextAligned(paragrafoB.setFontColor(Color.BLUE), x+20, y , 1,
              TextAlignment.RIGHT, VerticalAlignment.TOP, (float) Math.PI / 2f);

      document.close();
      pdfDocument.close();

   }

iText paragraph.setRotationAngle 更改文本方向

iText paragraph.setRotationAngle changes text orientation

java

pdf

pdf-generation

itext