Image manipulation

gistfile1.aw

<?php

/**
 * Resize Image Class
 *
 * @author      Erik Pettersson <mail@ptz0n.se>
 * @copyright   2011 Erik Pettersson <mail@ptz0n.se>
 * @license     http://www.opensource.org/licenses/mit-license.php MIT
 */
class Image {

    /**
     * Image
     *
     * @var resource
     */
    var $image;

    /**
     * Image width
     *
     * @var int
     */
    var $imageWidth;

    /**
     * Image height
     *
     * @var int
     */
    var $imageHeight;

    /**
     * Load image from file
     *
     * @param string $file
     * @return void
     */
    function load($file)
    {
        $size = getimagesize($file);
        switch($size[2]) {
            case IMAGETYPE_JPEG :
                $this->image = imagecreatefromjpeg($file);
                break;
            case IMAGETYPE_GIF :
                $this->image = imagecreatefromgif($file);
                break;
            case IMAGETYPE_PNG :
                $this->image = imagecreatefrompng($file);
                break;
        }

        $this->getWidth();
        $this->getHeight();
    }

    /**
     * Save image to file
     *
     * @param string $file
     * @return void
     */
    function save($file)
    {
        imagesavealpha($this->image, true);
        imagepng($this->image, $file);
        chmod($file, 0755);
    }

    /**
     * Output image
     *
     * @return void
     */
    function output()
    {
        header('Content-type: image/png');
        imagesavealpha($this->image, true);
        imagepng($this->image);
    }

    /**
     * Get image width
     *
     */
    function getWidth()
    {
        return $this->imageWidth = imagesx($this->image);
    }

    /**
     * Get image height
     *
     * @return int
     */
    function getHeight()
    {
        return $this->imageHeight = imagesy($this->image);
    }

    /**
     * Resize image to height
     *
     * @param int $height
     * @return void
     */
    function resizeToHeight($height)
    {
        $ratio = $height / $this->getHeight();
        $width = $this->getWidth() * $ratio;

        $this->resize($width, $height);
    }

    /**
     * Resize image to width
     *
     * @param int $width
     * @return void
     */
    function resizeToWidth($width)
    {
      $ratio = $width / $this->getWidth();
      $height = $this->getheight() * $ratio;

      $this->resize($width, $height);
   }

    /**
     * Resize image
     *
     * @param int $width
     * @param int $height
     * @return void
     */
    function resize($width, $height)
    {
        $image = imagecreatetruecolor($width, $height);
        imagecopyresampled($image, $this->image, 0, 0, 0, 0, $width, $height, $this->imageWidth, $this->imageHeight);

        $this->image = $image;
        $this->getWidth();
        $this->getHeight();
    }

    /**
     * Add reflection to image
     *
     * @param int $reflectionOpacity 0-127
     * @param int $reflectionHeight
     * @param int $reflectionGap
     * @return void
     */
    function addReflection($reflectionOpacity = 60, $reflectionHeight = 80, $reflectionGap = 12)
    {
        // Create new image canvas
        $image = imagecreatetruecolor($this->imageWidth, $this->imageHeight+$reflectionHeight+$reflectionGap);
        imagealphablending($image, false);
        // Fill with transparency
        imagefill($image, 0, 0, imagecolortransparent($image, imagecolorallocatealpha($image, 255, 255, 255, 127)));

        // Copy original image leaving space for reflection & gap
        imagecopyresampled($image, $this->image, 0, 0, 0, 0, $this->imageWidth, $this->imageHeight, $this->imageWidth, $this->imageHeight);

        // Create new single-line image to act as buffer
        $reflection = imagecreatetruecolor($this->imageWidth, 1);
        imagealphablending($reflection, false);
        imagefill($reflection, 0, 0, imagecolortransparent($reflection, imagecolorallocatealpha($reflection, 255, 255, 255, 127)));

        for ($y = 0; $y<$reflectionHeight; $y++) {
            // Copy each line, starting at the bottom
            imagecopy($reflection, $image, 0, 0, 0, $this->imageHeight-$y, $this->imageWidth, 1);
            // Set transparency to vary between reflectionOpacity and 127
            imagefilter($reflection, IMG_FILTER_COLORIZE, 0, 0, 0, ((127-$reflectionOpacity)+($reflectionOpacity*($y/$reflectionHeight))));
            // Copy line back to mirrored position in original
            imagecopyresized($image, $reflection, $a, $this->imageHeight+$y+$reflectionGap-1, 0, 0, $this->imageWidth-(2*$a), 1, $this->imageWidth, 1);
        }

        $this->image = $image;
    }
}