Adding printer marks with Aspose.Pdf

PrinterMarks.cs

using System;
using System.Collections.Generic;
//tested using Aspose.Pdf 18.8.0
using Aspose.Pdf;
using Aspose.Pdf.Drawing;

namespace Dirq.DocBuilder.Rendering
{
    public static class PrinterMarks
    {
        private enum Direction
        {
            Up,
            Right,
            Down,
            Left
        }

        /// <summary>
        /// Adds a Graph to each page in the document.  Then creates lines on each point of the TrimBox for a printer house cut lines.
        /// </summary>
        /// <param name="doc"></param>
        public static void AddPrinterMarks(ref Document doc)
        {
            foreach (Page page in doc.Pages)
            {
                var graph = new Graph((float)page.Rect.Width, (float)page.Rect.Height)
                {
                    Margin = new MarginInfo(0, 0, 0, 0),
                    ZIndex = 5555,
                    Width = (float)page.Rect.Width,
                    Height = (float)page.Rect.Height,
                    Left = 0,
                    Top = 0
                };

                float gap = (float)Math.Max(page.TrimBox.LLX - page.BleedBox.LLX, page.TrimBox.LLY - page.BleedBox.LLY);

                page.Paragraphs.Add(graph);

                //upper left
                graph.Shapes.Add(GetLine((float)page.TrimBox.LLX, (float)page.TrimBox.URY, Direction.Up, Color.Blue));
                graph.Shapes.Add(GetLine((float)page.TrimBox.LLX, (float)page.TrimBox.URY, Direction.Left, Color.Blue));

                //upper right
                graph.Shapes.Add(GetLine((float)page.TrimBox.URX, (float)page.TrimBox.URY, Direction.Up, Color.Blue));
                graph.Shapes.Add(GetLine((float)page.TrimBox.URX, (float)page.TrimBox.URY, Direction.Right, Color.Blue));

                //lower right
                graph.Shapes.Add(GetLine((float)page.TrimBox.URX, (float)page.TrimBox.LLY, Direction.Down, Color.Blue));
                graph.Shapes.Add(GetLine((float)page.TrimBox.URX, (float)page.TrimBox.LLY, Direction.Right, Color.Blue));

                //lower left
                graph.Shapes.Add(GetLine((float)page.TrimBox.LLX, (float)page.TrimBox.LLY, Direction.Down, Color.Blue));
                graph.Shapes.Add(GetLine((float)page.TrimBox.LLX, (float)page.TrimBox.LLY, Direction.Left, Color.Blue));
            }
        }

        private static Line GetLine(float startX, float startY, Direction direction, Color color = null)
        {
            //we don't want the points actually touching the trim mark
            //cause printer cuts are not going to be exact and we don't want anything showing
            const float gap = 9;

            //length of the line.  It'll probably go off the page.
            const float length = 36;

            float endX = startX;
            float endY = startY;

            if (color == null)
            {
                color = Color.Gray;
            }

            switch (direction)
            {
                case Direction.Up:
                    startY += gap;
                    endY += length;
                    break;
                case Direction.Right:
                    startX += gap;
                    endX += length;
                    break;
                case Direction.Down:
                    startY -= gap;
                    endY -= length;
                    break;
                case Direction.Left:
                    startX -= gap;
                    endX -= length;
                    break;
            }

            //lower left to upper right.  wtf.
            var line = new Line(new[] {startX, startY, endX, endY});

            line.GraphInfo.Color = color;

            return line;
        }
    }
}

Adds a Graph to each page in a Aspose.Pdf Document with trim marks.

Usage:

        [Test]
        public void PrinterMarksManualTest()
        {
            string methodName = MethodBase.GetCurrentMethod().Name;
            string path = DocConfig.GetAssetOutputPath(methodName + ".pdf");
            int pages = 4;

            var doc = new Document();

            for (int i = 1; i <= pages; i++)
            {
                Page page = doc.Pages.Add();

                page.PageInfo.Width = 678;
                page.PageInfo.Height = 858;
                page.PageInfo.Margin = new MarginInfo(0,0,0,0);
                page.ArtBox = new Rectangle(llx: 0, lly: 0, urx: 678, ury: 858); //678x858
                page.CropBox =  new Rectangle(llx: 0, lly: 0, urx: 678, ury: 858); //678x858
                page.MediaBox = new Rectangle(llx: 0, lly: 0, urx: 678, ury: 858); //678x858
                page.Rect = new Rectangle(llx: 0, lly: 0, urx: 678, ury: 858); //678x858

                page.TrimBox = new Rectangle(llx: 33, lly: 33, urx: 645, ury: 825); //612x792

                page.BleedBox = new Rectangle(llx: 24, lly: 24, urx: 654, ury: 834); //630x810

                page.Paragraphs.Add(new TextFragment($"{methodName} created on {DateTime.Now}.  Page {i}"));
            }

            doc.ProcessParagraphs();

            PrinterMarks.AddPrinterMarks(ref doc);

            doc.Save(path, SaveFormat.Pdf);
            doc.Dispose();

            FileAssert.Exists(path);
        }