<?php
 
 
class image
{
    private $supported, $edit, $root, $image;
 
        public function __construct( $root )
        {
            //Check if we're working with an actual
            //Directory
            if( is_dir($root) )
            {
                    //Fill in the array of the things we can do
                    $this->edit = array(
                                        'negative'    => IMG_FILTER_NEGATE,
                                        'greyscale'    => IMG_FILTER_GRAYSCALE,
                                        'brightness'=> IMG_FILTER_BRIGHTNESS,
                                        'contract'    => IMG_FILTER_CONTRAST,
                                        'colorize'    => IMG_FILTER_COLORIZE,
                                        'edge'        => IMG_FILTER_EDGEDETECT,
                                        'emboss'    => IMG_FILTER_EMBOSS,
                                        'guassion'    => IMG_FILTER_GAUSSIAN_BLUR,
                                        'blur'        => IMG_FILTER_SELECTIVE_BLUR,
                                        'sketch'    => IMG_FILTER_MEAN_REMOVAL,
                                        'smooth'    => IMG_FILTER_SMOOTH
                                       );
 
                  //Fill in an array of the image formats we support
                  $this->supported = array(
                                              'jpeg' => 'jpeg',
                                              'jpg'  => 'jpeg',
                                              'png'  => 'png',
                                              'gif'  => 'gif'
                                            );
                //Finally fill in the root and enforce trailing slash
                $this->root = rtrim( $root, '/' ) . '/';
 
            } else {
 
                throw new Exception("[Class Of: Image] Provided root directory does not exists");
            }
        }
 
        public function set( $img )
        {
            //See if our image file exists and it's supprted
            if( file_exists( $this->root . $img ) )
            {
                $type = pathinfo( $this->root . $img, PATHINFO_EXTENSION );
                if( array_key_exists( $type, $this->supported ) )
                {
 
                    //Set all neccesary information
                    $function = 'imagecreatefrom' . $this->supported[ $type ];
                    $this->image['file']      = $img;
                    $this->image['oResource'] = $function( $this->root . $img );
                    $this->image['width']       = imagesx( $this->image['oResource'] );
                    $this->image['height']       = imagesy( $this->image['oResource'] );
                    $this->image['type']      =  $this->supported[ $type ];
 
                ///Below is error reprting
                } else {
 
                    throw new Exception("[Class Of: Image] Image file is not currently supported");
                }
 
            } else {
 
                throw new Exception("[Class Of: Image] Image file does not exists relative to root");
            }
 
            return $this;
        }
 
        public function execute( $filename = '' )
        {
            //Make a filename of one is not provided
            if( $filename == '' )
            {
                $filename = '_edited_' . $this->image['file'];
            }
            //Create image
            $function = 'image' . $this->image['type'];
            $function( $this->image['oResource'], $this->root . $filename, 100);
 
            //Clean cache
            imagedestroy( $this->image['oResource'] );
        }
 
        public function effect()
        {
            //gather up all our arguments
            $args = func_get_args();
 
            //Check if I support what they want done
            if( array_key_exists( $args[0], $this->edit ) )
            {
                //Create priliminary argument array
                $arguments = array( $this->image['oResource'], $this->edit[ $args[0] ]);
                unset($args[0]); sort( $args ); //unset the unnecesaries
 
                //Now all our image filter function
                $arguments = array_merge( $arguments, $args );
                call_user_func_array( 'imagefilter', $arguments );
                return $this;
 
            ///Error reporting
            } else {
 
                throw new Exception("[Class Of: Gallery] Effect not supported");
            }
        }
 
        public function ratio( $maxWidth )
        {
            //Calculate the max height and send off to resize function
            $maxHeight = ($maxWidth * $this->image['height']) / $this->image['width'];
            $this->resize( $maxWidth, $maxHeight );
        }
 
        public function resize( $width, $height = '' )
        {
            if( empty($height) )
            {
                //Assume width is a percentage value now
                //Check for .20 || .2 bug
                $num = ( $num > 10 ) ? '.' . $num : '.0' . $num;
                $width = $this->image['width'] - ($this->image['width'] * $num);
                $height = $this->image['height'] - ($this->image['height'] * $num);
            }
            //Create a temporary pallete
            $img = imagecreatetruecolor( $width, $height );
            imagecopyresampled( $img, $this->image['oResource'], 0, 0, 0, 0, $width, $height, $this->image['width'], $this->image['height']);
 
            //Fill in the original with the new
            $this->image['oResource'] = $img;
            $this->image['width']       = $width;
            $this->image['height']    = $height;
 
            return $this;
        }
 
        public function flip( $dir )
        {
            //Check is we support basically
            switch( $dir )
            {
                //The process for flipping either left and right
                //Deviates by the subtraction of one variable
                case $dir == 'left' || $dir == 'right':
                {
                    //Create a pallete
                    $img = imagecreatetruecolor( $this->image['height'], $this->image['width'] );
 
                    //Begin traversing the image plane at the left uppermost corner
                    //travel down to the right down corner
                    for( $y = $this->image['height']; $y >= 0; --$y )
                    {
                        for( $x = 0; $x <= $this->image['width']; ++$x )
                        {
                            //Extract color index
                            $rgb = imagecolorat( $this->image['oResource'], $x, $y );
 
                            //Determine side so we can check which variable to subtract from
                            if( $dir == 'left' )
                            {
                                imagesetpixel( $img, $y, $this->image['width'] - $x, $rgb );
 
                            } else {
 
                                imagesetpixel( $img, $this->image['height'] - $y, $x, $rgb);
                            }
                        }
                    }
 
                    //set new height and width
                    $this->image['width'] = imagesx( $img );
                    $this->image['height'] = imagesy( $img );
 
                    break;
                }
 
                //Down is rather simple...
                case $dir == 'down' :
                {
                    $img = imagerotate( $this->image['oResource'], 180, 0);
                }
            }
 
            //set new image resource
            $this->image['oResource'] = $img;
 
            return $this;
        }
 
        public function crop( $oX, $oY, $nX, $nY )
        {
            //We must determine the number by which to
            //incrementing variables as well as the length
            //and height of the new image
            if( $oX > $nX )
            {
                $xBegin = $nX;
                $xLen = $oX - $nX;
            } else {
 
                $xBegin = $oX;
                $xLen = $nX - $oX;
            }
 
            if( $oY > $nY )
            {
                $yBegin = $nY;
                $yLen = $oY - $nY;
            } else {
 
                $yBegin = $oY;
                $yLen = $nY - $oY;
            }
 
            //Create pallete
            $img = imagecreatetruecolor( $xLen, $yLen );
 
            //Begin incrementing at 0 as if traversing
            //the new image instead of the old
            for( $y = 0; $y <= $yLen; ++$y )
            {
                for( $x = 0; $x <= $xLen; ++$x )
                {
                    //Adding our pretermined value takes us the pixel
                    //location we wanted to go to
                    $rgb = imagecolorat( $this->image['oResource'], $x + $xBegin, $y + $yBegin);
                    imagesetpixel( $img, $x, $y , $rgb );
                }
            }
 
            //Set neccesary information
            $this->image['oResource'] = $img;
            $this->image['height'] = imagesy( $img );
            $this->image['width'] = imagesx( $img );
 
            return $this;
        }
}
 
?>