11-16-2008, 04:01 PM
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#1 (permalink)
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The Addict
Join Date: Jun 2008
Posts: 335
Thanks: 2
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Simple Image manipulation class [ GD ]
I find that I have to work with image a whole lot on my projects ( thumbnail creation, AJAX editing, those type of things ) so I thought other developers might have need for this to. Initially it treated the image as an object but upon modification it now works slightly differentl so as to make it easier to traverse directories with and apply effects to all the images. Take a look.
--Be aware, the effect filter is essentially a wrapper for GD's imagefilter function thus anything the imagefilter supports so does effect()
PHP Code:
$img = new image( dirname(__FILE__) . '/');
$img->set('funny-pictures-kitten-is-figuring-out-who-to-pester.jpg')
->resize( 20 )
->crop(4, 5, 205, 201)
->effect('negative')
->flip('left')
->execute();
$img->set('another-funny-picture.jpg')
->resize( 20 )
->crop(4, 5, 205, 201)
->effect('negative')
->flip('left')
->execute();
The above will turn
Into
Now the actual code
PHP Code:
<?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;
}
}
?>
Last edited by Enfernikus : 11-16-2008 at 07:35 PM.
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