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<?php
class ImageResizer
{
public function resize(Image $image, $width, $height, $directory = '')
{
$this->assert_gd_extension_is_loaded();
$path = $this->default_path($image, $directory);
$original_picture = $this->create_image_identifier($image);
$new_picture = $this->create_ressource($image, $width, $height);
imagealphablending($new_picture, false);
imagesavealpha($new_picture, true);
imagecopyresampled($new_picture, $original_picture, 0, 0, 0, 0, $width, $height, $image->get_width(), $image->get_height());
$this->create_image($image, $new_picture, $path);
}
public function resize_with_max_values(Image $image, $width, $height, $directory = '')
{
$coef_width = $image->get_width() / $width;
$coef_height = $image->get_height() / $height;
$ratio = max($coef_width,$coef_height);
$width = $image->get_width() / $ratio;
$height = $image->get_height() / $ratio;
$this->resize($image, $width, $height, $directory);
}
public function resize_width(Image $image, $width, $directory)
{
$height = $image->get_height() / ($image->get_width() / $width);
$this->resize($image, $width, $height, $directory);
}
public function resize_height(Image $image, $height, $directory)
{
$width = $image->get_width() / ($image->get_height() / $height);
$this->resize($image, $width, $height, $directory);
}
private function default_path(Image $image, $directory)
{
if (empty($directory))
return $image->get_path();
else
return $directory;
}
private function create_image_identifier(Image $Image)
{
switch ($Image->get_mime_type())
{
case 'image/jpeg':
return imagecreatefromjpeg($Image->get_path());
break;
case 'image/png':
return imagecreatefrompng($Image->get_path());
break;
case 'image/gif':
return imagecreatefromgif($Image->get_path());
break;
default:
throw new UnsupportedOperationException($image->get_mime_type() . ' mime type is not supported.');
}
}
private function create_ressource(Image $Image, $width, $height)
{
if ($Image->get_mime_type() == 'image/gif')
{
return imagecreate($width, $height);
}
else
{
return imagecreatetruecolor($width, $height);
}
}
private function extension_new_path($directory)
{
$explode = explode('/', $directory);
$name_and_extension = array_pop($explode);
$explode = explode('.', $name_and_extension);
return TextHelper::strtolower(array_pop($explode));
}
private function create_image(Image $image, $create_picture, $directory)
{
$extension = $this->extension_new_path($directory);
switch ($extension)
{
case 'jpeg':
return imagejpeg($create_picture, $directory);
break;
case 'jpg':
return imagejpeg($create_picture, $directory);
break;
case 'png':
return imagepng($create_picture, $directory);
break;
case 'gif':
return imagegif($create_picture, $directory);
break;
default:
throw new UnsupportedOperationException($image->get_mime_type() . ' mime type is not supported.');
}
}
private function assert_gd_extension_is_loaded()
{
$server_configuration = new ServerConfiguration();
if (!$server_configuration->has_gd_library())
{
throw new Exception('The GD extension is required but not loaded.');
}
}
}
?>