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PDF Device Context in C#

Sample C# code for using PDFTron SDK to create and use PDFDC (i.e. a PDF Device Context). Windows developers can use standard GDI or GDI+ API-s to write on PDFDC and to generate PDF documents based on their existing drawing functions. PDFDC can also be used to implement file conversion from any printable file format to PDF. Learn more about our Windows PDF Library.

Step 1: Get your free trial license key, or sign in

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Step 2: Add the code:

//
// Copyright (c) 2001-2019 by PDFTron Systems Inc. All Rights Reserved.
//

using System;
using System.Drawing;
using System.Drawing.Drawing2D;

using pdftron;
using pdftron.Common;
using pdftron.Filters;
using pdftron.SDF;
using pdftron.PDF;

namespace PDFDCTestCS
{
	/// <summary>
	/// This sample shows how to create and use PDFDC (i.e. a PDF Device Context).
	/// Windows developers can use standard GDI or GDIPlus API-s to write on PDFDC 
	/// and to generate PDF documents based on their existing drawing functions.
	/// 
	/// The second portion of this sample shows how to create and use PDFDCEX.
	/// Windows developers can use standard GDI or GDIPlus API-s to write multi-page
	/// PDF documents using existing drawing code.
	///
	/// PDFDCEX can also be used to implement file conversion from any printable 
	/// file format to PDF (i.e. a virtual PDF printer driver).
	/// </summary>
	class Class1
	{
		private static pdftron.PDFNetLoader pdfNetLoader = pdftron.PDFNetLoader.Instance();
		static Class1() {}
		
		// Relative path to the folder containing test files.
		const string input_path = "../../../../TestFiles/";
		const string output_path = "../../../../TestFiles/Output/";

		/// <summary>
		/// The main entry point for the application.
		/// </summary>
		[STAThread]
		static void Main(string[] args)
		{
			PDFNet.Initialize();

			try
			{
				//////////////////////////////////////////////////////////////////////////
				// First the PDFDC
				// Start with a PDFDoc to put the picture into, and a PDFDC to translate GDI to PDF
				using (PDFDoc pdfdoc = new PDFDoc())
				{
					PDFDC pdf_dc = new PDFDC();

					// Set the scale between GDI logical units and the PDF page at 50/inch.
					pdf_dc.SetDPI(50);

					// Create a page to put the GDI content onto
					Page page = pdfdoc.PageCreate();

					// Begin the translation from GDI to PDF.
					// Provide the page to place the picture onto, and the bounding box for the content.
					// We're going to scale the GDI content to fill the page while preserving the aspect
					// ratio.
					// Get back a GDIPlus Graphics Object
					using (Graphics gr = pdf_dc.Begin(page, page.GetCropBox()))
					{
						// Create a path that consists of a single polygon.
						System.Drawing.Point[] polyPoints = 
						{
							new System.Drawing.Point(10, 10),
							new System.Drawing.Point(150, 10), 
							new System.Drawing.Point(100, 75),
							new System.Drawing.Point(100, 150)
						};

						GraphicsPath path = new GraphicsPath();
						path.AddPolygon(polyPoints);

						// Construct a region based on the path.
						Region region = new Region(path);

						// Draw the outline of the region.
						Pen pen = Pens.Black;
						gr.DrawPath(pen, path);

						// Set the clipping region of the Graphics object.
						gr.SetClip(region, CombineMode.Replace);

						// Draw some clipped strings.
						FontFamily fontFamily = new FontFamily("Arial");
						System.Drawing.Font font = new System.Drawing.Font(
							fontFamily,
							36, FontStyle.Bold,
							GraphicsUnit.Pixel);
						SolidBrush solidBrush = new SolidBrush(Color.FromArgb(255, 255, 0, 0));

						gr.DrawString(
							"A Clipping Region",
							font, solidBrush,
							new PointF(15, 25));

						gr.DrawString(
							"A Clipping Region",
							font,
							solidBrush,
							new PointF(15, 68));


						pdf_dc.End(); // Close PDF Device Context
					}

					// Add the page to the document
					pdfdoc.PagePushBack(page);

					//////////////////////////////////////////////////////////////////////////
					// Page two
					page = pdfdoc.PageCreate();
					using (Graphics gr = pdf_dc.Begin(page, page.GetCropBox(), true))
					{
						Rectangle myRectangle = new Rectangle(0, 0, 100, 50);
						LinearGradientBrush myLinearGradientBrush = new LinearGradientBrush(
							myRectangle,
							Color.Blue,
							Color.Green,
							LinearGradientMode.Horizontal);
						gr.FillEllipse(myLinearGradientBrush, myRectangle);

						// Complete the translation
						pdf_dc.End();
					}

					// Add the page to the document
					pdfdoc.PagePushBack(page);

					pdfdoc.Save(output_path + "PDFDCTest.pdf", SDFDoc.SaveOptions.e_remove_unused);
				}
				Console.WriteLine("Saved PDFDCTest.pdf");


				//////////////////////////////////////////////////////////////////////////
				// 
				// Now for PDFDCEX
				// Start with a PDFDoc to put the picture into, and a PDFDCEX to translate GDI to PDF
				using (PDFDoc pdfdoc2 = new PDFDoc())
				{
					PDFDCEX pdf_dcex = new PDFDCEX();

					// Begin the translation from GDI to PDF.
					// The page dimensions and the converter DPI determine the coordinate system.
					// Unlike PDFDC, the drawings will not be scaled to fit the bounding box.
					pdf_dcex.Begin(pdfdoc2);

					// Start the first page -- Get back a Graphics Object
					System.Drawing.Graphics gr2 = pdf_dcex.StartPage();

					// Create a path that consists of a single polygon.
					System.Drawing.Point[] polyPoints2 = 
					{
						new System.Drawing.Point(10, 10),
						new System.Drawing.Point(150, 10), 
						new System.Drawing.Point(100, 75),
						new System.Drawing.Point(100, 150)
					};

					GraphicsPath path2 = new GraphicsPath();
					path2.AddPolygon(polyPoints2);

					// Construct a region based on the path.
					Region region2 = new Region(path2);

					// Draw the outline of the region.
					Pen pen2 = Pens.Black;
					gr2.DrawPath(pen2, path2);

					// Set the clipping region of the Graphics object.
					gr2.SetClip(region2, CombineMode.Replace);

					// Draw some clipped strings.
					FontFamily fontFamily2 = new FontFamily("Arial");
					System.Drawing.Font font2 = new System.Drawing.Font(
						fontFamily2,
						36, FontStyle.Bold,
						GraphicsUnit.Pixel);
					SolidBrush solidBrush2 = new SolidBrush(Color.FromArgb(255, 255, 0, 0));

					gr2.DrawString(
						"A Clipping Region",
						font2, solidBrush2,
						new PointF(15, 25));

					gr2.DrawString(
						"A Clipping Region",
						font2,
						solidBrush2,
						new PointF(15, 68));

					pdf_dcex.EndPage();
					// at this point the Graphics Context gr2 has been disposed

					//////////////////////////////////////////////////////////////////////////
					// Page two -- get a new Graphics Object

					gr2 = pdf_dcex.StartPage();

					Rectangle myRectangle2 = new Rectangle(0, 0, 100, 50);
					LinearGradientBrush myLinearGradientBrush2 = new LinearGradientBrush(
						myRectangle2,
						Color.Blue,
						Color.Green,
						LinearGradientMode.Horizontal);
					gr2.FillEllipse(myLinearGradientBrush2, myRectangle2);
					gr2.DrawString(
						"An Ellipse Filled with a Linear Gradient",
						font2, solidBrush2,
						new PointF(15, 200));
					pdf_dcex.EndPage();

					// Complete the translation
					pdf_dcex.End();

					pdfdoc2.Save(output_path + "PDFDCEXTest.pdf", SDFDoc.SaveOptions.e_remove_unused);
				}
				Console.WriteLine("Saved PDFDCEXTest.pdf");
				Console.WriteLine("Done.");
			}
			catch (PDFNetException e)
			{
				Console.WriteLine(e.Message);
			}

		}
	}
}