Polyline Annotation

Polyline annotations display closed or open shapes with multiple edges on the page. When clicked, it displays a pop-up window containing the text of the associated note. GcPdf provides PolyLineAnnotation class to enable users to apply polyline annotations to the PDF file.

PolyLineAnnotation class provides the following properties to set various options for the polyline annotation:

Property	Description
UserName	Adds the user name to the text label in the title bar of the annotation’s pop-up window when the annotation is open and active.
Subject	Adds the text representing the subject of the annotation.
Contents	Adds the text to the annotation for display.
RichText	Adds the text to the annotation for display in the pop-up window when opened. You can format this text using HTML tags.
Opacity	Sets the opacity of the annotation.
FillColor	Sets the interior color with which to fill the annotation's elements.
LineEndingsFillColor	Sets the interior color with which to fill the annotation’s line endings.
LineStartStyle	Sets the style of line start.
LineEndStyle	Sets the style of line end.
LineWidth	Sets the line width in points.
LineDashPattern	Sets the line dash pattern. Null means a solid line.
Color	Sets the annotation color, popup window color, line color, etc.
Points	Adds the points of a polygon or polyline. The coordinates of points are relative to the upper left corner of the page's media box, with the Y (vertical) coordinates increasing from top to bottom.

Refer to the following example code to add a polyline annotation to a PDF document:

public void CreatePolyLineAnnotation()
{
    GcPdfDocument doc = new GcPdfDocument();
    Page page = doc.NewPage();
    RectangleF rc = new RectangleF(50, 50, 400, 40);
    page.Graphics.DrawString("This sample demonstrates how you can create a polyline annotation.",
        new TextFormat() { Font = StandardFonts.Times, FontSize = 14 }, rc);

    //define the points of the polyline
    var points = new List<PointF>();
    float x = rc.Left,y=rc.Bottom;
    for (int i=0 ;i<10 ;i++,x+=10)
    {
        points.Add(new PointF(x,y));
        y = i % 2 == 0 ? y - 10 : y+10;
    }

    //Create an instance of PolyLineAnnotation class and set its relevant properties
    var polyLineAnnot = new PolyLineAnnotation()
    {
        Points = points,
        UserName = "Jaime Smith",
        LineWidth = 2,
        Color = Color.Green,
        Contents = "This is a polyline annotation",
    };

    page.Annotations.Add(polyLineAnnot); //Add the polyline annotation to the page
    doc.Save("PolyLineAnnotation.pdf");
}