Java 如何将具有文本作为内容的矩形旋转到某个Angular ，比如使用 itext 7.1.0 逆时针方向旋转 90'

我需要一个矩形，其中包含一些上下文作为文本.我必须将矩形旋转到某个Angular ，比如说逆时针旋转90°，这样内容也会旋转.然而，当我编写这段代码时，它只显示一个矩形.

这是代码:

package main;

import java.io.FileNotFoundException;

import com.itextpdf.kernel.geom.AffineTransform;
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 com.itextpdf.layout.property.Property;
import com.itextpdf.layout.property.TextAlignment;
import com.itextpdf.layout.property.VerticalAlignment;

public class main {

    public static void main(String[] args) throws FileNotFoundException {
        // TODO Auto-generated method stub
        String dest = "C:\\Users\\beast\\Desktop\\samplePdf";
        PdfDocument pdf = new PdfDocument(new PdfWriter(dest));
        PdfPage page = pdf.addNewPage();
        PdfCanvas pdfCanvas = new PdfCanvas(page);
        Rectangle rect1 = new Rectangle(183, 488, 180, 32);
//      cordinates after rotation 90' counter clockwise
        Rectangle rect2 = new Rectangle(151, 488, 32, 180);
        pdfCanvas.rectangle(rect1);
        pdfCanvas.stroke();
        Canvas canvas = new Canvas(pdfCanvas, pdf, rect1);
        Text title = new Text("Thbvhs ybhsvb");
        Paragraph p = new Paragraph().add(title);
        canvas.add(p);
        AffineTransform transform=AffineTransform.getRotateInstance((float)(Math.PI/2));
        pdfCanvas.concatMatrix(transform);
        canvas.close();
        canvas=new Canvas(pdfCanvas, pdf, rect2);
        pdfCanvas.rectangle(rect2);
        pdfCanvas.stroke();
        canvas.add(p);
        canvas.close();
        pdf.close();

    }

}

这是pdf的输出: