IAutoShape shape = (IAutoShape) ppt.getSlides().get(0).getShapes().get(0);
float maxWidth = shape.getTextFrame().getMaxWidth();

IAutoShape shape = (IAutoShape) ppt.getSlides().get(0).getShapes().get(0);
double x = shape.getTextFrame().getStartLocationAtMaxWidth().getX();
double y = shape.getTextFrame().getStartLocationAtMaxWidth().getY();

//Configure a timestamp server
String url = "https://freetsa.org/tsr";
signature.configureTimestamp(url);

signature.addShowConfigureText(SignatureConfigureText.Contact_Info);//Show Contact_Info (default show all)
signature.removeShowConfigureText(SignatureConfigureText.Contact_Info);//Do not show Contact_Info
signature.setShowConfigureText(EnumSet.of(SignatureConfigureText.Contact_Info));//Only show Contact_Info

PdfDocument pdf = new PdfDocument();
PdfPageBase page = pdf.getPages().add();

//draw LineArrow
String text1 = "this is Arrow annotation";
PdfFont font = new PdfFont(PdfFontFamily.Helvetica, 20);
PdfSolidBrush brush1 = new PdfSolidBrush(new PdfRGBColor(Color.blue));
PdfStringFormat leftAlignment = new PdfStringFormat(PdfTextAlignment.Left, PdfVerticalAlignment.Middle);
page.getCanvas().drawString(text1, font, brush1, 50, 50, leftAlignment);
Dimension2D dimension = font.measureString(text1);
Rectangle2D.Float bounds = new Rectangle2D.Float(50, 50, (float) dimension.getWidth(), (float) dimension.getHeight());
int[] linePoints = new int[]{92, (int) (page.getSize().getHeight() - bounds.getY() - 60),
        (int) (92 + bounds.getWidth()), (int) (page.getSize().getHeight() - bounds.getY() - 60)};
PdfLineAnnotation annotation1 = new PdfLineAnnotation(linePoints, "LineArrow annotation test");
annotation1.setBeginLineStyle(PdfLineEndingStyle.OpenArrow);
annotation1.setEndLineStyle(PdfLineEndingStyle.OpenArrow);
annotation1.setBackColor(new PdfRGBColor(Color.red));
annotation1.setCaptionType(PdfLineCaptionType.Inline);
annotation1.setLineCaption(true);
((PdfNewPage) page).getAnnotations().add(annotation1);

//draw PolygonCloud
String text2 = "this is Cloud annotation";
PdfBrush brush2 = PdfBrushes.getBlue();
page.getCanvas().drawString(text2, font, brush2, 50, 200);
Point2D point2D[] = new Point2D[]{
        new Point2D.Float(30, 200),
        new Point2D.Float(300, 180),
        new Point2D.Float(300, 250),
        new Point2D.Float(30, 220),
        new Point2D.Float(30, 200)
};
PdfPolygonAnnotation annotation2 = new PdfPolygonAnnotation(page, point2D);
annotation2.setText("PolygonCloud annotation test");
annotation2.setAuthor("E-iceblue");
annotation2.setSubject("test");
annotation2.setModifiedDate(new Date());
annotation2.setBorderEffect(PdfBorderEffect.Big_Cloud);
annotation2.setLocation(new Point2D.Float(190, 230));
annotation2.setColor(new PdfRGBColor(Color.GRAY));
((PdfNewPage) page).getAnnotations().add(annotation2);

//draw circle
String text3 = "this is Circle annotation";
PdfBrush brush3 = PdfBrushes.getBlue();
Dimension2D dimension2D = font.measureString(text3);
dimension2D.setSize(dimension2D.getWidth() + 35, dimension2D.getHeight() + 20);
page.getCanvas().drawString(text3, font, brush3, 50, 300);
Rectangle2D.Float annotationBounds1 = new Rectangle2D.Float();
annotationBounds1.setFrame(new Point2D.Float(36, (float) 290), dimension2D);
PdfSquareAndCircleAnnotation annotation3 = new PdfSquareAndCircleAnnotation(annotationBounds1);
annotation3.setSubType(PdfSquareAndCircleAnnotationType.Circle);
float[] f1 = {0.5f, 0.5f, 0.5f, 0.5f};
annotation3.setRectangularDifferenceArray(f1);
annotation3.setText("Circle annotation test");
annotation3.setColor(new PdfRGBColor(Color.RED));
annotation3.setModifiedDate(new Date());
annotation3.setName("*****");
LineBorder border1 = new LineBorder();
border1.setBorderWidth(2);
annotation3.setLineBorder(border1);
((PdfNewPage) page).getAnnotations().add(annotation3);

//draw Square
String text4 = "this is Square annotation";
PdfBrush brush4 = PdfBrushes.getBlue();
Dimension2D dimension4 = font.measureString(text4);
dimension2D.setSize(dimension2D.getWidth() + 80, dimension2D.getHeight() + 20);
page.getCanvas().drawString(text4, font, brush4, 50, 400);
Rectangle2D.Float annotationBounds2 = new Rectangle2D.Float();
annotationBounds2.setFrame(new Point2D.Float(30, (float) 400), dimension4);
PdfSquareAndCircleAnnotation annotation4 = new PdfSquareAndCircleAnnotation(annotationBounds2);
annotation4.setSubType(PdfSquareAndCircleAnnotationType.Square);
float[] f2 = {0.5f, 0.5f, 0.5f, 0.5f};
annotation4.setRectangularDifferenceArray(f2);
annotation4.setText("Square annotation test");
annotation4.setColor(new PdfRGBColor(Color.RED));
annotation4.setModifiedDate(new Date());
annotation4.setName("*****");
LineBorder border2 = new LineBorder();
border2.setBorderWidth(2);
annotation4.setLineBorder(border2);
((PdfNewPage) page).getAnnotations().add(annotation4);


//draw connected lines
String text5 = "this is Connected lines annotation";
PdfBrush brush5 = PdfBrushes.getBlue();
page.getCanvas().drawString(text5, font, brush5, 50, 465);
Point2D pointzd[] = new Point2D[]{
        new Point2D.Float(30, 470),
        new Point2D.Float(300, 450),
        new Point2D.Float(300, 520),
        new Point2D.Float(30, 490),
        new Point2D.Float(30, 470)
};
PdfPolygonAnnotation annotation5 = new PdfPolygonAnnotation(page, pointzd);
annotation5.setText("Connected Lines annotation test");
annotation5.setAuthor("E-iceblue");
annotation5.setSubject("test");
annotation5.setModifiedDate(new Date());
annotation5.setBorderEffect(PdfBorderEffect.None);
annotation5.setLocation(new Point2D.Float(190, 230));
annotation5.setColor(new PdfRGBColor(Color.GRAY));
((PdfNewPage) page).getAnnotations().add(annotation5);

pdf.saveToFile("output/annotation.pdf");

for (PdfPageBase page : (Iterable) doc.getPages()) {
    content.append(page.extractText(true,true,true));
}