lastguest / pixeler

CLI image renderer

Pixeler

Render images in CLI with UTF-8 characters.

Installation

Require in your project with composer :

$ composer require lastguest/pixeler

This will also install a pixeler tool in :

your_project_dir/vendor/bin/pixeler

It works exactly like the example below.

Example

Create a file pixel.php :

<?php

// Include autoloader
include __DIR__."/vendor/autoload.php";

// Parse options from command line
$opts = array_merge([
    'd' => 1,    // Dithering mode : 0 = DITHER_NONE, 1 = DITHER_ERROR
    'f' => false,
    'r' => 1.0,  // Resize factor 1.0 = 100%
    'w' => 0.75, // Dither treshold weight
], getopt("f:r:w:d:ib"));

// An image file/url is required.
$opts['f'] || die("Must specify an image file.\n");

// The -i option inverts the image
$image = Pixeler\Pixeler::image($opts['f'], $opts['r'], isset($opts['i']), $opts['w'], $opts['d']);

// No colors if "-b" is passed
isset($opts['b']) && $image->clearColors();

// The Pixeler\Image instance render itself if casted to a string
echo $image;

$ php pixel.php -f http://drop.caffeina.co/image/160L0Y3C0a29/vocaloid.jpg -r .25 -w 0.25 -i

$ php pixel.php -f http://flippywall.com/wp-content/uploads/2014/07/Manga-Girl-Wallpaper-16.jpg -r 0.15 -w 0.5 -i

$ php pixel.php -f http://blog.circleci.com/wp-content/uploads/2014/07/elephant.jpg -r 0.3 -w 0.5 -b

Dithering

Use the -d option to choose 1-bit dithering mode.

Command	Constant	Description
-d0	Pixeler\Image::DITHER_NONE	Threshold 1-bit quantization
-d1	Pixeler\Image::DITHER_ERROR	Dither image with 1-bit Atkinson Dithering

Animation Example

You will see a lot of tearing, need some kind of vsync wait.

<?php

// Vendors
include __DIR__."/vendor/autoload.php";

$screen = new Pixeler\Canvas(160,100);
$sh2 = $screen->height()/2;
$sh4 = $sh2/1.5;
$ph = pi()/32;
$i = 0;

// To exit, press Ctr-C
while(1){
  $screen->clear();
  for ($x=0,$c=$screen->width(); $x < $c; $x++){
    $y = $sh4*sin($i++/128 + $ph*$x);
    $screen->setPixel($x,$sh2 + $y);
    $screen->setPixel($x,$sh2 + $y/2);
    $screen->setPixel($x,$sh2 + $y/4);
    $screen->setPixel($x,$sh2);
  }
  echo $screen;
}