Text#

Adding Text#

When it comes to adding new text annotations there are three types of annotation to consider:

  • Text - an annotation which looks like a note icon on the page - the text is displayed inside the note. You can also change the look of the icon with setIcon() for this annotation if required.

  • FreeText - an annotation with the text freely visible on the page.

  • Caret - an annotation which looks like an “insertion point” icon in between letters - the text is displayed inside the icon.

Sample code#

This code sample does the following:

  • Loads a file called “test.pdf” and returns a document instance.

  • Loads the first page and the adds the following annotations to it:

    • A Text annotation with text contents at (50,50) on the page.

    • A FreeText annotation with text contents and a default appearance with PDFAnnotation.setDefaultAppearance of “Helvetica” size 16 in green color at (0,0) on the page.

    • A Caret annotation with text contents at (100,50) on the page.

  • Updates the annotations with PDFAnnotation.update to ensure they display correctly.

  • Saves the document as a new PDF file.

EXAMPLE

let fileData = fs.readFileSync("test.pdf")
let document = mupdfjs.PDFDocument.openDocument(fileData, "application/pdf")
let page = document.loadPage(0)

// note
let note = page.createAnnotation("Text")
note.setContents("I'm a note!")
note.setRect([50,50,0,0])

// free text
let freeText = page.createAnnotation("FreeText")
freeText.setContents("I'm free text!")
freeText.setDefaultAppearance("Helv", 16, [0,1,0]);
freeText.setRect([0,0,200,50])

// caret
let caret = page.createAnnotation("Caret")
caret.setContents("I'm a caret!")
caret.setRect([100,50,0,0])

note.update()
freeText.update()
caret.update()

// Save the changes to a new file.
fs.writeFileSync("output-text.pdf", document.saveToBuffer("incremental").asUint8Array())

Note

For both the Text & Caret annotations in the example above we only set the upper left x and upper right y numbers for the setRect method (i.e. array in format [ulx,uly,lrx,lry]).

In this way we are treating it like an x & y point. This is because an icon is placed at that position to represent the annotation.

Decorating Text#

There are four keys to decorate text as follows:

  • Highlight

  • Underline

  • Squiggly

  • StrikeOut

By using these keys along with the createAnnotation method and a set of QuadPoints to represent the areas of text which we want to decorate we can markup text with our desired decoration type.

The following example would add a yellow highlight text annotation over two lines of text:

EXAMPLE

let fileData = fs.readFileSync("test.pdf")
let document = mupdfjs.PDFDocument.openDocument(fileData, "application/pdf")
let page = document.loadPage(0)
let annotation = page.createAnnotation("Highlight")
annotation.setColor([1, 1, 0])
annotation.setQuadPoints([
        [
            20, 65,
            230, 65,
            20, 85,
            230, 85,
        ],
        [
            20, 90,
            230, 90,
            20, 110,
            230, 110,
        ],
    ])

annotation.update()

// Save the changes to a new file.
fs.writeFileSync("output-hl-text.pdf", document.saveToBuffer("incremental").asUint8Array())

Redacting Text#

Se the section on Redactions for details.

Code samples

Code samples are in TypeScript and assume that the following requirements are defined in your TypeScript file header as follows:

import * as fs from "fs"
import * as mupdfjs from "mupdf/mupdfjs"