Draw Lines

This guide will show how to draw multiple lines on pdf files.

Before you begin #

You should get your API key from your UniCloud account.

If this is your first time using UniPDF SDK, follow this guide to set up a local development environment.

Project setup #

Clone the project repository #

In your terminal, clone examples repository. It contains the Go code we will be using for this guide.

git clone https://github.com/unidoc/unipdf-examples.git

Navigate to the drawing folder in the unipdf-examples directory.

cd unipdf-examples/drawing

Configure environment variables #

Replace the UNIDOC_LICENSE_API_KEY with your API credentials from your UniCloud account.

Linux/Mac #

export UNIDOC_LICENSE_API_KEY=PUT_YOUR_API_KEY_HERE

Windows #

set UNIDOC_LICENSE_API_KEY=PUT_YOUR_API_KEY_HERE

How it works #

Lines are drawn using the Creator.NewLine function provided in the creator package.

The following example code shows how lines are drawn using the creator package.

Lines 9-16 import necessary unipdf packages and other required libraries.

The init function in lines 18-25 authenticates your request with UNIDOC_LICENSE_API_KEY.

In Lines 27-85 the main function is defined where a new creator object is instantiated and all the line drawing functions are called. Writing the pdf document to a file is also done here in line 80. The front page of the document and the table of content is created here.

Lines 87-120 define a function for creating lines using absolute positioning.

Lines 122-168 define a function for creating lines using relative positioning.

Lines 178-227 draw lines inside Division components. All the lines are created inside a creator.VectorDrawable component and then added to Division component one by one. Finally the division is drawn using Creator.Draw() function, which is done in line 226.

Lines 229-313 draw lines inside a Table. In this function all the lines are added to a table cell using cell.SetContent(content). Finally the table is drawn by calling c.Draw(table) in line 312.

Lines 315-322 define a function for creating a new paragraph object using the creator package. A new paragraph is created using Creator.NewStyledParagraph() function.

Lines 324-325 define a function for creating a new line using the necessary parameters.

Lines 350-360 define a function for creating a creator.Margins using the given parameters.

Run the code #

go run pdf_draw_lines.go

Sample output #