Change the fill color of a shape in a presentation

OpenXML Presentation


 string FilePath = @"..\..\..\..\Sample Files\";

string FileName = FilePath + "Fill color of a shape.pptx";

SetPPTShapeColor(FileName);

// Change the fill color of a shape.

// The test file must have a filled shape as the first shape on the first slide.

public static void SetPPTShapeColor(string docName)

{

    using (PresentationDocument ppt = PresentationDocument.Open(docName, true))

    {

        // Get the relationship ID of the first slide.

        PresentationPart part = ppt.PresentationPart;

        OpenXmlElementList slideIds = part.Presentation.SlideIdList.ChildElements;

        string relId = (slideIds[0] as SlideId).RelationshipId;

        // Get the slide part from the relationship ID.

        SlidePart slide = (SlidePart)part.GetPartById(relId);

        if (slide != null)

        {

            // Get the shape tree that contains the shape to change.

            ShapeTree tree = slide.Slide.CommonSlideData.ShapeTree;

            // Get the first shape in the shape tree.

            Shape shape = tree.GetFirstChild<Shape>();

            if (shape != null)

            {

                // Get the style of the shape.

                ShapeStyle style = shape.ShapeStyle;

                // Get the fill reference.

                Drawing.FillReference fillRef = style.FillReference;

                // Set the fill color to SchemeColor Accent 6;

                fillRef.SchemeColor = new Drawing.SchemeColor();

                fillRef.SchemeColor.Val = Drawing.SchemeColorValues.Accent6;

                // Save the modified slide.

                slide.Slide.Save();

            }

        }

    }

}

Aspose.Slides

We need to follow following steps to fill the shapes in presentation:

  • Create an instance of Presentation class.
  • Obtain the reference of a slide by using its Index.
  • Add an IShape to the slide.
  • Set the Fill Type of the Shape to Solid.
  • Set the color of the Shape.
  • Write the modified presentation as a PPTX file.

 string FilePath = @"..\..\..\..\Sample Files\";

string FileName = FilePath + "Fill color of a shape.pptx";

//Instantiate PrseetationEx class that represents the PPTX 

using (Presentation pres = new Presentation())

{

    //Get the first slide

    ISlide sld = pres.Slides[0];

    //Add autoshape of rectangle type

    IShape shp = sld.Shapes.AddAutoShape(ShapeType.Rectangle, 50, 150, 75, 150);

    //Set the fill type to Solid

    shp.FillFormat.FillType = FillType.Solid;

    //Set the color of the rectangle

    shp.FillFormat.SolidFillColor.Color = Color.Yellow;

    //Write the PPTX file to disk

    pres.Save(FileName, SaveFormat.Pptx);

}

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Sample Code

Apply a theme to a presentation Count the number of Slides