Question

I have a powerpoint document with a single slide containing a single rectangle with the default color at 70% opacity.

I open it using

var doc = DocumentFormat.OpenXml.Packaging.PresentationDocument
  .Open(@"path\to\pptx", false);

For the life of me, looking through the classes available from the doc root, I cannot find a property that specifies what the opacity of my shape is.

Where do I look to get opacity?

Answer 1

Just tested, works.

using DocumentFormat.OpenXml.Packaging;
using System;
using System.Linq;
using DRAW = DocumentFormat.OpenXml.Drawing;
using DocumentFormat.OpenXml.Presentation;

.....

using (PresentationDocument outputDocument = PresentationDocument.Open(@"C:\Users\YN\Desktop\80.pptx", true))
{

    Slide slide = outputDocument.PresentationPart.SlideParts.First<SlidePart>().Slide;
    CommonSlideData csd = slide.GetFirstChild<CommonSlideData>();
    ShapeTree st = csd.GetFirstChild<ShapeTree>();
    Shape s = st.GetFirstChild<Shape>();
    ShapeProperties sp = s.GetFirstChild<ShapeProperties>();
    DRAW.SolidFill sf = sp.GetFirstChild<DRAW.SolidFill>();
    DRAW.SchemeColor sc = sf.GetFirstChild<DRAW.SchemeColor>();
    DRAW.Alpha a = sc.GetFirstChild<DRAW.Alpha>();
    Console.WriteLine((int)a.Val);

}