How to Draw Figures in PDF documents

Environment

Version	Product	Author
2024.1.124	RadPdfProcessing	Desislava Yordanova

Description

This article demonstrates a sample approach on how to draw a small figure containing an arc and some lines using RadPdfProcessing.

Solution

To draw an arc using the ArcSegment class, follow these steps:

1. Create a Path object and set its IsFilled and IsStroked properties to true.
2. Create a PathGeometry object and set its FillRule property to FillRule.EvenOdd.
3. Add a PathFigure to the PathGeometry and set its StartPoint property to the starting point of the figure.
4. Create an instance of the ArcSegment class and set its Point, RadiusX, and RadiusY properties. The Point property represents the endpoint of the arc, while RadiusX and RadiusY represent the radii for the X and Y coordinates respectively.
5. Add the ArcSegment to the Segments collection of the PathFigure.
6. Set the Geometry property of the Path to the PathGeometry.

Here is an example of how to draw an arc:

private static void AddArcSegment(RadFixedPage page)
{
    Telerik.Windows.Documents.Fixed.Model.Graphics.Path path = page.Content.AddPath();
    path.IsFilled = true;
    path.IsStroked = true;

    PathGeometry pathGeometry = new PathGeometry();
    pathGeometry.FillRule = FillRule.EvenOdd;

    PathFigure figure = pathGeometry.Figures.AddPathFigure();
    figure.StartPoint = new Point(100, 200);

    var segment = new ArcSegment()
    {
        Point = new Point(200, 300),
        RadiusX = 20,
        RadiusY = 50,
    };

    figure.Segments.Add(segment);

    path.Geometry = pathGeometry;
}

To draw lines, you can use the LineSegment class. Here is an example of how to draw a triangle:

private void AddLineSegment(RadFixedPage page)
{
    Telerik.Windows.Documents.Fixed.Model.Graphics.Path path = page.Content.AddPath();
    path.IsFilled = false;
    path.IsStroked = true;

    PathGeometry pathGeometry = new PathGeometry();
    pathGeometry.FillRule = FillRule.EvenOdd;

    PathFigure figure1 = pathGeometry.Figures.AddPathFigure();
    ApplyLine(figure1, new Point(300, 200), new Point(400, 200));

    PathFigure figure2 = pathGeometry.Figures.AddPathFigure();
    ApplyLine(figure2, new Point(400, 200), new Point(250, 100));

    PathFigure figure3 = pathGeometry.Figures.AddPathFigure();
    ApplyLine(figure3, new Point(250, 100), new Point(300, 200));

    path.Geometry = pathGeometry;
}

private static void ApplyLine(PathFigure figure, Point startPoint, Point endPoint)
{
    figure.StartPoint = startPoint;

    var segment = new LineSegment
    {
        Point = endPoint
    };

    figure.Segments.Add(segment);
}

The following code snippet shows how to use the above methods:

   RadFixedDocument fixedDocument = new RadFixedDocument();
   RadFixedPage fixedPage = fixedDocument.Pages.AddPage();
   AddArcSegment(fixedPage);
   AddLineSegment(fixedPage);

   PdfFormatProvider provider = new PdfFormatProvider();
   string filePath = @"..\..\output.pdf";
   File.Delete(filePath);
   using (Stream output = File.OpenWrite(filePath))
   { 
       provider.Export(fixedDocument, output);
   }

For more information on using geometries, figures, and segments, you can refer to our Geometry help article.

You can find the result of the combined arc and triangle in the below screenshot: