julamb/string-pixel-width

Blazingly fast measure string width in pixels on the server in Javascript (Node.Js)

string-pixel-width

String pixel width measurement on the backend in Javascript.

Why I created this package? Read more about purpose

Installation

To install the stable version:

npm install --save string-pixel-width

Supported fonts:

• Andale Mono
• Arial
• Avenir
• Avenir Next
• Comic Sans MS
• Courier New
• Georgia
• Helvetica
• Impact
• Times New Roman
• Trebuchet MS
• Verdana
• Webdings
• Open Sans
• Tahoma

Example

var pixelWidth = require('string-pixel-width');

const width = pixelWidth('My text ...', { size: 10 });
console.log('This text is ' + width + 'px long in the size of 10px.');

// This text is 43.5px long in the size of 10px.

var pixelWidth = require('string-pixel-width');

const width = pixelWidth('My text ...', { font: 'impact', size: 10 });
console.log('This text is ' + width + 'px long in the size of 10px.');

// This text is 42px long in the size of 10px.

var pixelWidth = require('string-pixel-width');

const width = pixelWidth('My text ...', { font: 'open sans', size: 10, bold: true, italic: true });
console.log('This text is ' + width + 'px long in the size of 10px.');

// This text is 47px long in the size of 10px using bold and italic proportions.

How to contribute

PRs are welcome :) This library uses static map of width of every ASCII letter for all supported fonts.

1. Clone the repository
2. Open file src/pixelWidthCalculator.html in your editor
3. Add your font name into array of fonts (currently var websafe) and save
4. Open up src/pixelWidthCalculator.html in Google Chrome. It should look like this:
5. Map of withs will be generated for you - copy it and replace content of file src/widthsMap.js

Please everytime make sure you don't broke existing fonts - remove any font or broke his widths.