com.aspose.words

Example:

Document doc = new Document();

// The lines will cross the whole page
float pageWidth = (float) doc.getFirstSection().getPageSetup().getPageWidth();
float pageHeight = (float) doc.getFirstSection().getPageSetup().getPageHeight();

// This line goes from top left to bottom right by default
Shape lineA = new Shape(doc, ShapeType.LINE);
{
    lineA.setBounds(new Rectangle2D.Float(0f, 0f, pageWidth, pageHeight));
    lineA.setRelativeHorizontalPosition(RelativeHorizontalPosition.PAGE);
    lineA.setRelativeVerticalPosition(RelativeVerticalPosition.PAGE);
}

Assert.assertEquals(new Rectangle2D.Float(0f, 0f, pageWidth, pageHeight), lineA.getBoundsInPoints());

// This line goes from bottom left to top right because we flipped it
Shape lineB = new Shape(doc, ShapeType.LINE);
{
    lineB.setBounds(new Rectangle2D.Float(0f, 0f, pageWidth, pageHeight));
    lineB.setFlipOrientation(FlipOrientation.HORIZONTAL);
    lineB.setRelativeHorizontalPosition(RelativeHorizontalPosition.PAGE);
    lineB.setRelativeVerticalPosition(RelativeVerticalPosition.PAGE);
}

Assert.assertEquals(new Rectangle2D.Float(0f, 0f, pageWidth, pageHeight), lineB.getBoundsInPoints());

// Add lines to the document
doc.getFirstSection().getBody().getFirstParagraph().appendChild(lineA);
doc.getFirstSection().getBody().getFirstParagraph().appendChild(lineB);

doc.save(getArtifactsDir() + "Shape.LineFlipOrientation.docx");