Superscript and Subscript

Manage Super Script and Sub Script Text

You can add superscript and subscript text inside any paragraph portion. For adding Superscript or Subscript text in Aspose.Slides text frame one must use the setEscapement method of PortionFormat class.

This property returns or sets the superscript or subscript text (value from -100% (subscript) to 100% (superscript)). For example:

• Create an instance of Presentation class.
• Obtain the reference of a slide by using its Index.
• Add an AutoShape of Rectangle type to the slide.
• Access the TextFrame associated with the AutoShape.
• Clear existing Paragraphs
• Create a new paragraph object for holding superscript text and add it to the Paragraphs collection of the TextFrame.
• Create a new portion object
• Set Escapement property for the portion between 0 to 100 for adding superscript. (0 mean no superscript)
• Set some text for Portion and then add that in portion collection of paragraph.
• Create a new paragraph object for holding subscript text and add it to the IParagraphs collection of the ITextFrame.
• Create a new portion object
• Set Escapement property for portion between 0 to -100 for adding superscript. (0 mean no subscript)
• Set some text for Portion and then add that in portion collection of paragraph.
• Save the presentation as a PPTX file.

The implementation of the above steps is given below.

// Instantiate a Presentation class that represents a PPTX
var pres = new aspose.slides.Presentation();
try {
    // Get slide
    var slide = pres.getSlides().get_Item(0);
    // Create text box
    var shape = slide.getShapes().addAutoShape(aspose.slides.ShapeType.Rectangle, 100, 100, 200, 100);
    var textFrame = shape.getTextFrame();
    textFrame.getParagraphs().clear();
    // Create paragraph for superscript text
    var superPar = new aspose.slides.Paragraph();
    // Create portion with usual text
    var portion1 = new aspose.slides.Portion();
    portion1.setText("SlideTitle");
    superPar.getPortions().add(portion1);
    // Create portion with superscript text
    var superPortion = new aspose.slides.Portion();
    superPortion.getPortionFormat().setEscapement(30);
    superPortion.setText("TM");
    superPar.getPortions().add(superPortion);
    // Create paragraph for subscript text
    var paragraph2 = new aspose.slides.Paragraph();
    // Create portion with usual text
    var portion2 = new aspose.slides.Portion();
    portion2.setText("a");
    paragraph2.getPortions().add(portion2);
    // Create portion with subscript text
    var subPortion = new aspose.slides.Portion();
    subPortion.getPortionFormat().setEscapement(-25);
    subPortion.setText("i");
    paragraph2.getPortions().add(subPortion);
    // Add paragraphs to text box
    textFrame.getParagraphs().add(superPar);
    textFrame.getParagraphs().add(paragraph2);
    pres.save("formatText.pptx", aspose.slides.SaveFormat.Pptx);
} finally {
    if (pres != null) {
        pres.dispose();
    }
}