Gregwar's Tex2pngBundle

GregwarTex2pngBundle provides a service and a twig helper to convert Tex formulas to PNG images

Installation

Step 1: Download the GregwarTex2pngBundle

Using the vendors script

Add the following lines to your deps file:

    [GregwarTex2pngBundle]
        git=git://github.com/Gregwar/Tex2pngBundle.git
        target=/bundles/Gregwar/Tex2pngBundle

Now, run the vendors script to download the bundle:

$ php bin/vendors install

Using submodules

If you prefer instead to use git submodules, then run the following:

$ git submodule add git://github.com/Gregwar/Tex2pngBundle.git vendor/bundles/Gregwar/Tex2pngBundle
$ git submodule update --init

Using Composer

Add the following to the "require" section of your composer.json file:

    "gregwar/tex2png-bundle": "1.0.0"

And update your dependencies

    php composer.phar update

Step 2: Configure the Autoloader

If you use composer, you can skip this step.

Add it to your autoload.pp :

<?php
...
'Gregwar' => __DIR__.'/../vendor/bundles',

Step 3: Enable the bundle

Registers the bundle in your app/AppKernel.php:

<?php
...
public function registerBundles()
{
    $bundles = array(
        ...
        new Gregwar\Tex2pngBundle\GregwarTex2pngBundle(),
        ...
    );
...

Step 4: Configure the bundle and set up the directories

Adds the following configuration to your app/config/config.yml:

gregwar_tex2png: ~

If you want to customize the cache directory name, you can specify it:

gregwar_tex2png:
    cache_dir:  my_cache_dir

Creates the cache directory and change the permissions so the web server can write in it:

mkdir web/cache
chmod 777 web/cache

Usage

Basics

This bundle is based on the Gregwar's Tex2png class and provides a service and a twig extension :

<img src="{{ tex('\\sum_{i=0}^{i=n} i') }}" />

The PNG image will be generated using the formula and cached into a file. If this file already exists, it will do nothing else but just lookup for the good file name.

Note that you can use the tex_img twig function to generate the whole HTML tag :

{{ tex_img('\\sum_{i=0}^{i=n} i') }}

If you want to change the density (resolution) of the image, you can specify it as a second argument (defaults: 155) :

{{ tex_img('\\sum_{i=0}^{i=n} i', 300) }}

Using the service

Twig2pngBundle provides a servie that can be used to generate tex files directly from your own logics :

<?php
...
$this->get('tex2png')->create('\sum_{i=0}^{i=n} i')
    ->saveTo('formulas/sum.png')
    ->generate();

Requirements

GregwarTex2pngBundle need you to have latex and dvipng installed, a temporary directory, and the shell_exec() PHP function should be available and useable.

License

This bundle is under MIT license