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<?php
/**
* Class to hold information about an image and to provide basic operations on images.
* @link http://www.yiiframework.com/extension/simpleimage/
* @author tzur
*
*/
class SimpleImage {
/**
* The image.
* @var resource
*/
var $image;
/**
* The type of the image.
* @see http://www.php.net/manual/en/image.constants.php
* @var integer
*/
var $image_type;
/**
* The image informations.
* @see http://www.php.net/manual/en/function.getimagesize.php
* @var array
*/
var $image_info;
/**
* Creates the SimpleImage instance and loads all necessary information.
* @param string $filename
* @link http://www.php.net/manual/en/function.getimagesize.php
* @link http://www.php.net/manual/en/function.imagecreatefromjpeg.php
* @link http://www.php.net/manual/en/function.imagecreatefromgif.php
* @link http://www.php.net/manual/en/function.imagecreatefrompng.php
*
*/
function __construct($filename) {
$this->image_info = $image_info = getimagesize($filename);
$this->image_type = $image_info[2];
if ($this->image_type == IMAGETYPE_JPEG) {
$this->image = imagecreatefromjpeg($filename);
} elseif ($this->image_type == IMAGETYPE_GIF) {
$this->image = imagecreatefromgif($filename);
} elseif ($this->image_type == IMAGETYPE_PNG) {
$this->image = imagecreatefrompng($filename);
}
}
/**
* Saves the image.
* @param string $filename
* @param int $image_type
* @param int $compression
* @param int $permissions
* @link http://www.php.net/manual/en/function.imagejpeg.php
* @link http://www.php.net/manual/en/function.imagegif.php
* @link http://www.php.net/manual/en/function.imagepng.php
* @link http://www.php.net/manual/en/function.chmod.php
*/
function save($filename, $image_type = IMAGETYPE_JPEG, $compression = 75, $permissions = null) {
if ($image_type == IMAGETYPE_JPEG) {
imagejpeg($this->image, $filename, $compression);
} elseif ($image_type == IMAGETYPE_GIF) {
imagegif($this->image, $filename);
} elseif ($image_type == IMAGETYPE_PNG) {
imagepng($this->image, $filename);
}
if ($permissions != null) {
chmod($filename, $permissions);
}
}
/**
* Outputs the image.
* @param int $image_type
* @link http://www.php.net/manual/en/function.imagejpeg.php
* @link http://www.php.net/manual/en/function.imagegif.php
* @link http://www.php.net/manual/en/function.imagepng.php
*/
function output($image_type = IMAGETYPE_JPEG) {
if ($image_type == IMAGETYPE_JPEG) {
imagejpeg($this->image);
} elseif ($image_type == IMAGETYPE_GIF) {
imagegif($this->image);
} elseif ($image_type == IMAGETYPE_PNG) {
imagepng($this->image);
}
}
/**
* Returns the width of the image.
* @return int Return the width of the image or false on errors.
* @link http://www.php.net/manual/en/function.imagesx.php
*/
function getWidth() {
return imagesx($this->image);
}
/**
* Returns the height of the image.
* @return int Return the height of the image or false on errors.
* @link http://www.php.net/manual/en/function.imagesy.php
*/
function getHeight() {
return imagesy($this->image);
}
/**
* Resizes the image to given height.
* Keeps the ratio.
* @param number $height
*/
function resizeToHeight($height) {
$ratio = $height / $this->getHeight();
$width = $this->getWidth() * $ratio;
$this->resize($width, $height);
}
/**
* Resizes the image to given width.
* Keeps the ratio.
* @param number $width
*/
function resizeToWidth($width) {
$ratio = $width / $this->getWidth();
$height = $this->getHeight() * $ratio;
$this->resize($width, $height);
}
/**
* Scales the image with given scale.
* @param number $scale
*/
function scale($scale) {
$width = $this->getWidth() * $scale / 100;
$height = $this->getHeight() * $scale / 100;
$this->resize($width, $height);
}
/**
* Resizes the image to given width and height.
* @param number $width
* @param number $height
* @link http://www.php.net/manual/en/function.imagecopyresampled.php
*/
function resize($width, $height) {
$new_image = imagecreatetruecolor($width, $height);
imagecopyresampled($new_image, $this->image, 0, 0, 0, 0, $width, $height, $this->getWidth(), $this->getHeight());
$this->image = $new_image;
}
function blend($width, $height) {
$this->resizeToWidth($width);
$new_image = imagecreatetruecolor($width, $height);
imagecopyresampled($new_image, $this->image, 0, 0, 0, 0, $width, $height, $width, $height);
imagealphablending($new_image,true);
imagefilledrectangle($new_image, 0, 0, $width, $height, imagecolorallocatealpha($new_image, 255, 255, 255, 30));
$this->image = $new_image;
}
}
?>
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