/**
*
* Erzeugt das PlaceholderImage und liefert dessen URL, Höhe und Breite.
* @paramd CacheFile $origCacheFile das ursprünge CacheFile, welches durch den Platzhalter ersetzt werden soll
* @return CacheFile
*/
private function generatePlaceHolder(CacheFile $origCacheFile)
{
$document = JFactory::getDocument();
$language = $document->getLanguage();
$displayWidth = $origCacheFile->displayWidth();
$displayHeight = $origCacheFile->displayHeight();
$cacheFile = $origCacheFile->newCacheFileForPlaceholder($language);
if (file_exists($cacheFile->getAbsoluteCacheFile())) {
return $cacheFile;
}
$placeholderImage = ImageCreateTrueColor($displayWidth, $displayHeight);
imagefilledrectangle($placeholderImage, 2, 2, $displayWidth - 3, $displayHeight - 3, 0xeeeeee);
$fontSize = 2;
$string = JText::_('MOSIMAGE_PLACE_HOLDER_IMAGE_TEXT');
$textWidth = imagefontwidth($fontSize) * strlen($string);
$center = ceil($displayWidth / 2);
$x = $center - ceil($textWidth / 2);
$color = ImageColorAllocate($placeholderImage, 0, 0, 0);
ImageString($placeholderImage, $fontSize, $x, 45, $string, $color);
imagejpeg($placeholderImage, $cacheFile->getAbsoluteCacheFile(), 80);
imagedestroy($placeholderImage);
return $cacheFile;
}
