ICSharpCode.AvalonEdit.Rendering.BackgroundGeometryBuilder.GetRectsForSegment C# (CSharp) Method

        public static IEnumerable<Rect> GetRectsForSegment(TextView textView, ISegment segment)
        {
            if (textView == null)
                throw new ArgumentNullException("textView");
            if (segment == null)
                throw new ArgumentNullException("segment");
            return GetRectsForSegmentImpl(textView, segment);
        }

        /// <inheritdoc/>
        public override void Draw(TextView textView, DrawingContext drawingContext)
        {
            if (Pen == null)
            {
                return;
            }

            foreach (Rect rect in BackgroundGeometryBuilder.GetRectsForSegment(textView, this))
            {
                if (rect.Width <= 1 || rect.Height <= 1)
                {
                    // Current segment is inside a folding.
                    continue;
                }

                var start    = rect.BottomLeft;
                var end      = rect.BottomRight;
                var geometry = new StreamGeometry();
                using (var context = geometry.Open())
                {
                    context.BeginFigure(start, false, false);

                    const double zigLength    = 3;
                    const double zigHeight    = 3;
                    int          numberOfZigs = (int)((end.X - start.X) / zigLength + 0.5f);
                    if (numberOfZigs < 2)
                    {
                        numberOfZigs = 2;
                    }

                    for (int i = 0; i < numberOfZigs; i++)
                    {
                        var p = new Point(
                            start.X + (i + 1) * zigLength,
                            start.Y - (i % 2) * zigHeight + 1);

                        context.LineTo(p, true, false);
                    }
                }

                drawingContext.DrawGeometry(null, Pen, geometry);
            }
        }