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279
autoload/class.Image.php
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279
autoload/class.Image.php
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<?php
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class ImageManipulator
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{
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/**
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* @var int
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*/
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protected $width;
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/**
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* @var int
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*/
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protected $height;
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/**
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* @var resource
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*/
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protected $image;
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/**
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* Image manipulator constructor
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*
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* @param string $file OPTIONAL Path to image file or image data as string
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* @return void
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*/
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public function __construct($file = null)
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{
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if (null !== $file) {
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if (is_file($file)) {
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$this->setImageFile($file);
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} else {
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$this->setImageString($file);
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}
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}
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}
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/**
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* Set image resource from file
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*
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* @param string $file Path to image file
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* @return ImageManipulator for a fluent interface
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* @throws InvalidArgumentException
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*/
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public function setImageFile($file)
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{
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if (!(is_readable($file) && is_file($file))) {
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throw new InvalidArgumentException("Image file $file is not readable");
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}
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if (is_resource($this->image)) {
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imagedestroy($this->image);
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}
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list ($this->width, $this->height, $type) = getimagesize($file);
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switch ($type) {
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case IMAGETYPE_GIF :
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$this->image = imagecreatefromgif($file);
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break;
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case IMAGETYPE_JPEG :
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$this->image = imagecreatefromjpeg($file);
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break;
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case IMAGETYPE_PNG :
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$this->image = imagecreatefrompng($file);
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break;
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default :
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throw new InvalidArgumentException("Image type $type not supported");
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}
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return $this;
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}
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/**
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* Set image resource from string data
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*
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* @param string $data
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* @return ImageManipulator for a fluent interface
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* @throws RuntimeException
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*/
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public function setImageString($data)
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{
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if (is_resource($this->image)) {
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imagedestroy($this->image);
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}
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if (!$this->image = imagecreatefromstring($data)) {
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throw new RuntimeException('Cannot create image from data string');
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}
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$this->width = imagesx($this->image);
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$this->height = imagesy($this->image);
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return $this;
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}
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/**
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* Resamples the current image
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*
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* @param int $width New width
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* @param int $height New height
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* @param bool $constrainProportions Constrain current image proportions when resizing
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* @return ImageManipulator for a fluent interface
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* @throws RuntimeException
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*/
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public function resample($width, $height, $constrainProportions = true)
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{
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if (!is_resource($this->image)) {
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throw new RuntimeException('No image set');
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}
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if ($constrainProportions) {
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if ($this->height >= $this->width) {
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$width = round($height / $this->height * $this->width);
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} else {
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$height = round($width / $this->width * $this->height);
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}
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}
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$temp = imagecreatetruecolor($width, $height);
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imagecopyresampled($temp, $this->image, 0, 0, 0, 0, $width, $height, $this->width, $this->height);
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return $this->_replace($temp);
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}
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/**
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* Enlarge canvas
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*
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* @param int $width Canvas width
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* @param int $height Canvas height
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* @param array $rgb RGB colour values
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* @param int $xpos X-Position of image in new canvas, null for centre
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* @param int $ypos Y-Position of image in new canvas, null for centre
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* @return ImageManipulator for a fluent interface
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* @throws RuntimeException
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*/
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public function enlargeCanvas($width, $height, array $rgb = array(), $xpos = null, $ypos = null)
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{
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if (!is_resource($this->image)) {
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throw new RuntimeException('No image set');
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}
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$width = max($width, $this->width);
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$height = max($height, $this->height);
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$temp = imagecreatetruecolor($width, $height);
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if (count($rgb) == 3) {
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$bg = imagecolorallocate($temp, $rgb[0], $rgb[1], $rgb[2]);
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imagefill($temp, 0, 0, $bg);
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}
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if (null === $xpos) {
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$xpos = round(($width - $this->width) / 2);
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}
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if (null === $ypos) {
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$ypos = round(($height - $this->height) / 2);
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}
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imagecopy($temp, $this->image, (int) $xpos, (int) $ypos, 0, 0, $this->width, $this->height);
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return $this->_replace($temp);
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}
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/**
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* Crop image
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*
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* @param int|array $x1 Top left x-coordinate of crop box or array of coordinates
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* @param int $y1 Top left y-coordinate of crop box
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* @param int $x2 Bottom right x-coordinate of crop box
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* @param int $y2 Bottom right y-coordinate of crop box
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* @return ImageManipulator for a fluent interface
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* @throws RuntimeException
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*/
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public function crop($x1, $y1 = 0, $x2 = 0, $y2 = 0)
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{
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if (!is_resource($this->image)) {
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throw new RuntimeException('No image set');
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}
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if (is_array($x1) && 4 == count($x1)) {
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list($x1, $y1, $x2, $y2) = $x1;
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}
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$x1 = max($x1, 0);
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$y1 = max($y1, 0);
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$x2 = min($x2, $this->width);
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$y2 = min($y2, $this->height);
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$width = $x2 - $x1;
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$height = $y2 - $y1;
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$temp = imagecreatetruecolor($width, $height);
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imagecopy($temp, $this->image, 0, 0, $x1, $y1, $width, $height);
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return $this->_replace($temp);
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}
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/**
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* Replace current image resource with a new one
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*
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* @param resource $res New image resource
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* @return ImageManipulator for a fluent interface
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* @throws UnexpectedValueException
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*/
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protected function _replace($res)
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{
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if (!is_resource($res)) {
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throw new UnexpectedValueException('Invalid resource');
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}
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if (is_resource($this->image)) {
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imagedestroy($this->image);
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}
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$this->image = $res;
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$this->width = imagesx($res);
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$this->height = imagesy($res);
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return $this;
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}
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/**
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* Save current image to file
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*
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* @param string $fileName
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* @return void
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* @throws RuntimeException
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*/
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public function save($fileName, $type = IMAGETYPE_JPEG)
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{
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$dir = dirname($fileName);
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if (!is_dir($dir)) {
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if (!mkdir($dir, 0755, true)) {
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throw new RuntimeException('Error creating directory ' . $dir);
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}
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}
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try {
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switch ($type) {
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case IMAGETYPE_GIF :
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if (!imagegif($this->image, $fileName)) {
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throw new RuntimeException;
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}
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break;
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case IMAGETYPE_PNG :
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if (!imagepng($this->image, $fileName)) {
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throw new RuntimeException;
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}
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break;
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case IMAGETYPE_JPEG :
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default :
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if (!imagejpeg($this->image, $fileName, 95)) {
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throw new RuntimeException;
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}
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}
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} catch (Exception $ex) {
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throw new RuntimeException('Error saving image file to ' . $fileName);
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}
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}
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/**
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* Returns the GD image resource
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*
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* @return resource
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*/
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public function getResource()
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{
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return $this->image;
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}
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/**
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* Get current image resource width
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*
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* @return int
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*/
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public function getWidth()
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{
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return $this->width;
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}
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/**
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* Get current image height
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*
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* @return int
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*/
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public function getHeight()
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{
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return $this->height;
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}
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}
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