public void Draw()

in tools/AstVisualizer/AstVisualizer/Views/TextMarkerService.cs [157:224]
62 lines of code
14 McCabe index (conditional complexity)

		public void Draw(TextView textView, DrawingContext drawingContext)
		{
			if (textView == null)
				throw new ArgumentNullException("textView");
			if (drawingContext == null)
				throw new ArgumentNullException("drawingContext");
			if (markers == null || !textView.VisualLinesValid)
				return;
			var visualLines = textView.VisualLines;
			if (visualLines.Count == 0)
				return;
			int viewStart = visualLines.First().FirstDocumentLine.Offset;
			int viewEnd = visualLines.Last().LastDocumentLine.EndOffset;
			foreach (TextMarker marker in markers.FindOverlappingSegments(viewStart, viewEnd - viewStart)) {
				if (marker.BackgroundColor != null) {
					BackgroundGeometryBuilder geoBuilder = new BackgroundGeometryBuilder();
					geoBuilder.AlignToWholePixels = true;
					geoBuilder.CornerRadius = 3;
					geoBuilder.AddSegment(textView, marker);
					Geometry geometry = geoBuilder.CreateGeometry();
					if (geometry != null) {
						Color color = marker.BackgroundColor.Value;
						SolidColorBrush brush = new SolidColorBrush(color);
						brush.Freeze();
						drawingContext.DrawGeometry(brush, null, geometry);
					}
				}
				var underlineMarkerTypes = TextMarkerTypes.SquigglyUnderline | TextMarkerTypes.NormalUnderline | TextMarkerTypes.DottedUnderline;
				if ((marker.MarkerTypes & underlineMarkerTypes) != 0) {
					foreach (Rect r in BackgroundGeometryBuilder.GetRectsForSegment(textView, marker)) {
						Point startPoint = r.BottomLeft;
						Point endPoint = r.BottomRight;
						
						Brush usedBrush = new SolidColorBrush(marker.MarkerColor);
						usedBrush.Freeze();
						if ((marker.MarkerTypes & TextMarkerTypes.SquigglyUnderline) != 0) {
							double offset = 2.5;
							
							int count = Math.Max((int)((endPoint.X - startPoint.X) / offset) + 1, 4);
							
							StreamGeometry geometry = new StreamGeometry();
							
							using (StreamGeometryContext ctx = geometry.Open()) {
								ctx.BeginFigure(startPoint, false, false);
								ctx.PolyLineTo(CreatePoints(startPoint, endPoint, offset, count).ToArray(), true, false);
							}
							
							geometry.Freeze();
							
							Pen usedPen = new Pen(usedBrush, 1);
							usedPen.Freeze();
							drawingContext.DrawGeometry(Brushes.Transparent, usedPen, geometry);
						}
						if ((marker.MarkerTypes & TextMarkerTypes.NormalUnderline) != 0) {
							Pen usedPen = new Pen(usedBrush, 1);
							usedPen.Freeze();
							drawingContext.DrawLine(usedPen, startPoint, endPoint);
						}
						if ((marker.MarkerTypes & TextMarkerTypes.DottedUnderline) != 0) {
							Pen usedPen = new Pen(usedBrush, 1);
							usedPen.DashStyle = DashStyles.Dot;
							usedPen.Freeze();
							drawingContext.DrawLine(usedPen, startPoint, endPoint);
						}
					}
				}
			}
		}