Add Line Object to PDF file

Add Line object

Aspose.PDF for Java 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 Document instance.

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 ExampleLine() {
        // Create Document instance
        Document pdfDocument = new Document();
        // Add page to pages collection of PDF file
        Page page = pdfDocument.getPages().add();
        // Create Graph instance
        Graph graph = new Graph(100, 400);

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

        // Create Rectangle instance
        Line line = new Line(new float[] { 100, 100, 200, 100 });
        
        line.getGraphInfo().setLineWidth(5);
        
        // Add rectangle object to shapes collection of Graph object
        graph.getShapes().add(line);

        // Save PDF file
        pdfDocument.save(_dataDir + "LineAdded.pdf");
    }

How to add Dotted Dashed Line to your PDF document

public static void ExampleDashedLine() {
        // Create Document instance
        Document pdfDocument = new Document();
        // Add page to pages collection of PDF file
        Page page = pdfDocument.getPages().add();

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

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

        // Set color for Line object
        line.getGraphInfo().setColor(Color.getRed());
        // Specify dash array for line object
        line.getGraphInfo().setDashArray(new int[] { 0, 1, 0 });
        // Set the dash phase for Line instance
        line.getGraphInfo().setDashPhase(1);
        // Add line to shapes collection of drawing object
        canvas.getShapes().add(line);
        // Save PDF document
        pdfDocument.save(_dataDir + "DashLength_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
        Document pdfDocument = new Document();
        // Add page to pages collection of PDF file
        Page page = pdfDocument.getPages().add();
        // Set page margin on all sides as 0

        page.getPageInfo().getMargin().setLeft(0);
        page.getPageInfo().getMargin().setRight(0);
        page.getPageInfo().getMargin().setBottom(0);
        page.getPageInfo().getMargin().setTop(0);

        // Create Graph object with Width and Height equal to page dimensions
        Graph graph = new Graph((float) page.getPageInfo().getWidth(), (float) page.getPageInfo().getHeight());

        // Create first line object starting from Lower-Left to Top-Right corner of page
        Line line = new Line(new float[] { (float) page.getRect().getLLX(), 0, (float) page.getPageInfo().getWidth(),
                (float) page.getRect().getURY() });

        // Add line to shapes collection of Graph object
        graph.getShapes().add(line);
        // Draw line from Top-Left corner of page to Bottom-Right corner of page
        Line line2 = new Line(new float[] { 0, (float) page.getRect().getURY(), (float) page.getPageInfo().getWidth(),
                (float) page.getRect().getLLX() });

        // Add line to shapes collection of Graph object
        graph.getShapes().add(line2);
        // Add Graph object to paragraphs collection of page
        page.getParagraphs().add(graph);

        // Save PDF file
        pdfDocument.save(_dataDir + "DrawingLine_out.pdf");
    }