Add Line Object to PDF file

Add Line object

Aspose.PDF for .NET supports the feature to add graph objects (for example graph, line, rectangle etc.) to PDF documents. You also get the leverage to add Line object where you can also specify the dash pattern, color and other formatting for Line element.

Follow the steps below:

  1. Create a new PDF Document

  2. Add Page to pages collection of PDF file

  3. Create Graph instance.

  4. Add Graph object to paragraphs collection of page instance.

  5. Create Rectangle instance.

  6. Set line width.

  7. Add Rectangle object to shapes collection of Graph object.

  8. Save your PDF file.

The following code snippet shows how to add a Rectangle object that is filled with color.

        public static void AddLineObjectToPDF()
        {
            // Create Document instance
            var document = new Document();

            // Add page to pages collection of PDF file
            var page = document.Pages.Add();

            // Create Graph instance
            var graph = new Aspose.Pdf.Drawing.Graph(100, 400);

            // Add graph object to paragraphs collection of page instance
            page.Paragraphs.Add(graph);

            // Create Rectangle instance
            var line = new Line(new float[] { 100, 100, 200, 100 });

            // Specify fill color for Graph object
            line.GraphInfo.DashArray = new int[] { 0, 1, 0 };
            line.GraphInfo.DashPhase = 1;

            // Add rectangle object to shapes collection of Graph object
            graph.Shapes.Add(line);

            // Save PDF file
            document.Save(_dataDir + "AddLineObject_out.pdf");
        }

Add Line

How to add Dotted Dashed Line to your PDF document

        public static void DashLengthInBlackAndDashLengthInWhite()
        {
            // Create Document instance
            var document = new Document();

            // Add page to pages collection of PDF file
            var page = document.Pages.Add();

            // Create Drawing object with certain dimensions
            var canvas = new Aspose.Pdf.Drawing.Graph(100, 400);
            // Add drawing object to paragraphs collection of page instance
            page.Paragraphs.Add(canvas);

            // Create Line object
            var line = new Line(new float[] { 100, 100, 200, 100 });
            // Set color for Line object
            line.GraphInfo.Color = Color.Red;
            // Specify dash array for line object
            line.GraphInfo.DashArray = new int[] { 0, 1, 0 };
            // Set the dash phase for Line instance
            line.GraphInfo.DashPhase = 1;
            // Add line to shapes collection of drawing object
            canvas.Shapes.Add(line);
            // Save PDF file
            document.Save(_dataDir + "DashLengthInBlackAndDashLengthInWhite_out.pdf");
        }

Let’s check the result:

Dashed Line

Draw Line Across the Page

We can also use line object to draw a cross starting from Left-Bottom to Right-Upper corner and Left-Top corner to Bottom-Right corner.

Please take a look over following code snippet to accomplish this requirement.

   public static void ExampleLineAcrossPage()
        {

            // Create Document instance
            var document = new Document();

            // Add page to pages collection of PDF file
            var page = document.Pages.Add();
            // Set page margin on all sides as 0

            page.PageInfo.Margin.Left = 0;
            page.PageInfo.Margin.Right = 0;
            page.PageInfo.Margin.Bottom = 0;
            page.PageInfo.Margin.Top = 0;

            // Create Graph object with Width and Height equal to page dimensions
            var graph = new Aspose.Pdf.Drawing.Graph(
                (float)page.PageInfo.Width,
                (float)page.PageInfo.Height);

            // Create first line object starting from Lower-Left to Top-Right corner of page
            var line = new Line(
                    new float[]{
                        (float)page.Rect.LLX, 0,
                        (float)page.PageInfo.Width,
                        (float)page.Rect.URY });

            // Add line to shapes collection of Graph object
            graph.Shapes.Add(line);
            // Draw line from Top-Left corner of page to Bottom-Right corner of page
            var line2 = new Line(
                new float[]{ 0,
                    (float) page.Rect.URY,
                    (float) page.PageInfo.Width,
                    (float) page.Rect.LLX });

            // Add line to shapes collection of Graph object
            graph.Shapes.Add(line2);

            // Add Graph object to paragraphs collection of page
            page.Paragraphs.Add(graph);

            // Save PDF file
            document.Save(_dataDir + "ExampleLineAcrossPage_out.pdf");
        }

Drawing Line