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<?php
/**
* Class QREps
*
* @created 09.05.2022
* @author smiley <smiley@chillerlan.net>
* @copyright 2022 smiley
* @license MIT
*/
namespace chillerlan\QRCode\Output;
use function array_values, count, date, implode, is_array, is_numeric, max, min, round, sprintf;
/**
* Encapsulated Postscript (EPS) output
*
* @see https://github.com/t0k4rt/phpqrcode/blob/bb29e6eb77e0a2a85bb0eb62725e0adc11ff5a90/qrvect.php#L52-L137
* @see https://web.archive.org/web/20170818010030/http://wwwimages.adobe.com/content/dam/Adobe/en/devnet/postscript/pdfs/5002.EPSF_Spec.pdf
* @see https://web.archive.org/web/20210419003859/https://www.adobe.com/content/dam/acom/en/devnet/actionscript/articles/PLRM.pdf
* @see https://github.com/chillerlan/php-qrcode/discussions/148
*/
class QREps extends QROutputAbstract{
public const MIME_TYPE = 'application/postscript';
/**
* @inheritDoc
*/
public static function moduleValueIsValid($value):bool{
if(!is_array($value) || count($value) < 3){
return false;
}
// check the first values of the array
foreach(array_values($value) as $i => $val){
if($i > 3){
break;
}
if(!is_numeric($val)){
return false;
}
}
return true;
}
/**
* @param array $value
*
* @inheritDoc
*/
protected function prepareModuleValue($value):string{
$values = [];
foreach(array_values($value) as $i => $val){
if($i > 3){
break;
}
// clamp value and convert from int 0-255 to float 0-1 RGB/CMYK range
$values[] = round((max(0, min(255, intval($val))) / 255), 6);
}
return $this->formatColor($values);
}
/**
* @inheritDoc
*/
protected function getDefaultModuleValue(bool $isDark):string{
return $this->formatColor(($isDark) ? [0.0, 0.0, 0.0] : [1.0, 1.0, 1.0]);
}
/**
* Set the color format string
*
* 4 values in the color array will be interpreted as CMYK, 3 as RGB
*
* @throws \chillerlan\QRCode\Output\QRCodeOutputException
*/
protected function formatColor(array $values):string{
$count = count($values);
if($count < 3){
throw new QRCodeOutputException('invalid color value');
}
$format = ($count === 4)
// CMYK
? '%f %f %f %f C'
// RGB
: '%f %f %f R';
return sprintf($format, ...$values);
}
/**
* @inheritDoc
*/
public function dump(?string $file = null):string{
[$width, $height] = $this->getOutputDimensions();
$eps = [
// main header
'%!PS-Adobe-3.0 EPSF-3.0',
'%%Creator: php-qrcode (https://github.com/chillerlan/php-qrcode)',
'%%Title: QR Code',
sprintf('%%%%CreationDate: %1$s', date('c')),
'%%DocumentData: Clean7Bit',
'%%LanguageLevel: 3',
sprintf('%%%%BoundingBox: 0 0 %s %s', $width, $height),
'%%EndComments',
// function definitions
'%%BeginProlog',
'/F { rectfill } def',
'/R { setrgbcolor } def',
'/C { setcmykcolor } def',
'%%EndProlog',
];
if($this::moduleValueIsValid($this->options->bgColor)){
$eps[] = $this->prepareModuleValue($this->options->bgColor);
$eps[] = sprintf('0 0 %s %s F', $width, $height);
}
// create the path elements
$paths = $this->collectModules(fn(int $x, int $y, int $M_TYPE):string => $this->module($x, $y, $M_TYPE));
foreach($paths as $M_TYPE => $path){
if(empty($path)){
continue;
}
$eps[] = $this->getModuleValue($M_TYPE);
$eps[] = implode("\n", $path);
}
// end file
$eps[] = '%%EOF';
$data = implode("\n", $eps);
$this->saveToFile($data, $file);
return $data;
}
/**
* Returns a path segment for a single module
*/
protected function module(int $x, int $y, int $M_TYPE):string{
if(!$this->drawLightModules && !$this->matrix->isDark($M_TYPE)){
return '';
}
$outputX = ($x * $this->scale);
// Actual size - one block = Topmost y pos.
$top = ($this->length - $this->scale);
// Apparently y-axis is inverted (y0 is at bottom and not top) in EPS, so we have to switch the y-axis here
$outputY = ($top - ($y * $this->scale));
return sprintf('%d %d %d %d F', $outputX, $outputY, $this->scale, $this->scale);
}
}
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