Created
May 10, 2015 12:42
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Code for "How to resize a logo to specific dimensions keeping its aspect ratio using PHP" tutorial published at http://burnmind.com/tutorials/resize-logo-keeping-aspect-ratio
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{ | |
"require": { | |
"intervention/image": "~2.1" | |
}, | |
"autoload": { | |
"psr-0": { | |
"LogoResizer": "src/" | |
} | |
} | |
} |
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<?php | |
require_once('vendor/autoload.php'); | |
use LogoResizer\LogoResizer; | |
function get_resized_logo($logo) { | |
$resizer = new LogoResizer(300, 200); | |
$resizer->set_source_logo($logo); | |
if(!$resizer->is_source_logo_valid()) { | |
return false; | |
} | |
$logo_resized = $resizer->resize_logo(); | |
if(!$logo_resized) { | |
return false; | |
} | |
return $resizer->get_resized_logo(); | |
} | |
if(isset($_FILES['logo'])) { | |
$resized_logo = get_resized_logo($_FILES['logo']); | |
if($resized_logo === false) { | |
//show error | |
} else { | |
echo $resized_logo->response('jpg', 70); | |
die(); | |
} | |
} | |
?> | |
<form method="POST" action="" enctype="multipart/form-data"> | |
<input type="file" name="logo" /> | |
<input type="submit" value="Upload logo" /> | |
</form> |
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<?php | |
namespace LogoResizer; | |
use Intervention\Image\ImageManagerStatic as Image; | |
class LogoResizer { | |
private $desired_width; | |
private $desired_height; | |
private $desired_aspect_ratio; | |
private $source_logo; | |
private $resized_logo; | |
public function __construct($desired_width = 300, $desired_height = 200) { | |
$this->desired_width = $desired_width; | |
$this->desired_height = $desired_height; | |
$this->desired_aspect_ratio = $this->get_aspect_ratio($desired_width, $desired_height); | |
} | |
public function set_source_logo($source_image) { | |
$this->source_logo = $source_image; | |
} | |
public function is_source_logo_valid() { | |
$details = getimagesize($this->source_logo['tmp_name']); | |
if($details === false) { | |
return false; | |
} | |
return true; | |
} | |
public function get_resized_logo() { | |
return $this->resized_logo; | |
} | |
public function resize_logo() { | |
try { | |
$logo = Image::make($this->source_logo['tmp_name']); | |
if($logo->width() === $this->desired_width && $logo->height() === $this->desired_height) { | |
$this->resized_logo = $logo; | |
return true; | |
} | |
$logo_aspect_ratio = $this->get_aspect_ratio($logo->width(), $logo->height()); | |
if($this->desired_aspect_ratio === $logo_aspect_ratio) { | |
$logo = $this->resize($logo, $this->desired_width, $this->desired_height); | |
$this->resized_logo = $logo; | |
return true; | |
} | |
$background_colour = $logo->pickColor(0, 0, 'hex'); | |
if($this->desired_aspect_ratio > $logo_aspect_ratio) { | |
$logo = $this->resize($logo, null, $this->desired_height); | |
} else { | |
$logo = $this->resize($logo, $this->desired_width, null); | |
} | |
$logo->resizeCanvas($this->desired_width, $this->desired_height, 'center', false, $background_colour); | |
$this->resized_logo = $logo; | |
return true; | |
} catch (Exception $e) { | |
return false; | |
} | |
} | |
private function get_aspect_ratio($width, $height) { | |
return $width / $height; | |
} | |
private function resize($logo, $width, $height) { | |
$logo->resize($width, $height, function ($constraint) { | |
$constraint->aspectRatio(); | |
}); | |
return $logo; | |
} | |
} |
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