Get Paragraph Bounds from Presentations in .NET

Get Paragraph and Portion Coordinates in TextFrame

Using Aspose.Slides for .NET, developers can now get the rectangular coordinates for Paragraph inside paragraphs collection of TextFrame. It also allows you to get the coordinates of portion inside portion collection of a paragraph. In this topic, we are going to demonstrate with the help of an example that how to get the rectangular coordinates for paragraph along with position of portion inside a paragraph.

Get Rectangular Coordinates of Paragraph

The new method GetRect() has been added. It allows to get paragraph bounds rectangle.

// Instantiate a Presentation object that represents a presentation file
using (Presentation presentation = new Presentation("Shapes.pptx"))
{
    IAutoShape shape = (IAutoShape)presentation.Slides[0].Shapes[0];
        var textFrame = (ITextFrame)shape.TextFrame;
        RectangleF rect = ((Paragraph)textFrame.Paragraphs[0]).GetRect();
}

Get size of paragraph and portion inside table cell text frame

To get the Portion or Paragraph size and coordinates in a table cell text frame, you can use the IPortion.GetRect and IParagraph.GetRect methods.

This sample code demonstrates the described operation:

using (Presentation pres = new Presentation("source.pptx"))
{
    Table tbl = pres.Slides[0].Shapes[0] as Table;

    ICell cell = tbl.Rows[1][1];


    double x = tbl.X + tbl.Rows[1][1].OffsetX;
    double y = tbl.Y + tbl.Rows[1][1].OffsetY;

    foreach (IParagraph para in cell.TextFrame.Paragraphs)
    {
        if (para.Text == "")
            continue;

        RectangleF rect = para.GetRect();
        IAutoShape shape =
            pres.Slides[0].Shapes.AddAutoShape(ShapeType.Rectangle,
                rect.X + (float)x, rect.Y + (float)y, rect.Width, rect.Height);

        shape.FillFormat.FillType = FillType.NoFill;
        shape.LineFormat.FillFormat.SolidFillColor.Color = Color.Yellow;
        shape.LineFormat.FillFormat.FillType = FillType.Solid;


        foreach (IPortion portion in para.Portions)
        {
            if (portion.Text.Contains("0"))
            {
                rect = portion.GetRect();
                shape =
                    pres.Slides[0].Shapes.AddAutoShape(ShapeType.Rectangle,
                        rect.X + (float)x, rect.Y + (float)y, rect.Width, rect.Height);

                shape.FillFormat.FillType = FillType.NoFill;
            }
        }
    }
}

FAQ

In what units are the coordinates returned for a paragraph and text portions measured?

In points, where 1 inch = 72 points. This applies to all coordinates and dimensions on the slide.

Does word wrapping affect a paragraph’s bounds?

Yes. If wrapping is enabled in the TextFrame, the text breaks to fit the area width, which changes the paragraph’s actual bounds.

Can paragraph coordinates be reliably mapped to pixels in the exported image?

Yes. Convert points to pixels using: pixels = points × (DPI / 72). The result depends on the DPI chosen for rendering/export.

How do I get the “effective” paragraph formatting parameters, taking style inheritance into account?

Use the effective paragraph formatting data structure; it returns the final consolidated values for indents, spacing, wrapping, RTL, and more.