Background:
The InkAnnotation class can be used to add free-hand text to a PDF. The InkAnnotation.Paths property is used to render the annotation's content which is specified by discrete points that should be connected when a PDF viewer renders them. The points can be connected either by straight or curved lines depending on the viewer implementation.
Steps to Complete:
1. Create an InkAnnotation instance:
var inkAnnot = new InkAnnotation()
{
UserName = user1,
Rect = new RectangleF(rc.Left, rc.Bottom + 20, 72 * 5, 72 * 2),
LineWidth = 2,
Color = Color.DarkBlue,
Contents = "This is an ink annotation drawn via InkAnnotation.Paths."
};
float x = 80, y = rc.Bottom + 24, h = 18, dx = 2, dy = 4, dx2 = 4, w = 10, xoff = 15;2. Scribble ‘ink’ text on the PDF:
// i
inkAnnot.Paths.Add(new[] { new PointF(x + w/2, y), new PointF(x + w/2, y + h), new PointF(x + w, y + h*.7f) });
inkAnnot.Paths.Add(new[] { new PointF(x + w/2 - dx, y - h/3 + dy), new PointF(x + w/2 + dx, y - h/3) });
// n
x += xoff;
inkAnnot.Paths.Add(new[] { new PointF(x, y), new PointF(x, y + h), new PointF(x, y + h - dy), new PointF(x + w*0.7f, y),
new PointF(x + w - dx/2, y + h*.6f), new PointF(x + w, y + h), new PointF(x + w + dx2, y + h*.7f) });
// k
x += xoff;
inkAnnot.Paths.Add(new[] { new PointF(x, y - h/3), new PointF(x, y + h) });
inkAnnot.Paths.Add(new[] { new PointF(x + w, y), new PointF(x + dx, y + h/2 - dy), new PointF(x, y + h/2),
new PointF(x + dx2, y + h/2 + dy), new PointF(x + w, y + h), new PointF(x + w + dx2, y + h*.7f) });3. Add annotation to the Page
page.Annotations.Add(inkAnnot);where page is the Page class instance representing a page of the document.
Tags:
Justin Mack