Add Line Object to PDF file

The following code snippet also work with Aspose.PDF.Drawing library.

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");
}

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:

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");
}