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.





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

Lines PDF

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