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Crop Canvas
This class allows you to crop an image in a variety of ways. You can crop in an absolute or relative way (to a certain size or by a certain size), both as a pixel number or a percentage. Or you can automatically crop based on a threshold limit.
Along with this class comes a web-based interface that you can use the drag and easily resize the area you'd like to crop, set various initial cropping sizes (such as 16:9 porportion, or 200x100 pixels), and more.
cropcanvas.zip
A zip file containing all the required files for the crop canvas class and interface to give you a quick and easy download option.
24.5kb in size
last modified Nov 29, 2006 at 6:38am
18012 downloads
class.cropcanvas.php
This is the main class file for the core cropping features.
If you use the crop interface then you will need this to process the image and for a number of variables/constants defined in this file.
<?php
/**
* $Id: class.cropcanvas.php 44 2006-06-26 10:05:41Z Andrew $
*
* [Description]
*
* This is a class allows you to crop an image in a variety of ways.
* You can crop in an absolute or relative way (to a certain size or
* by a certain size), both as a pixel number or a percentage. You
* can also save or display the cropped image. The cropping can be
* done in 9 different positions: top left, top, top right, left,
* centre, right, bottom left, bottom, or bottom right. Or you can
* crop automatically based on a threshold limit. The original
* image can be loaded from the file system or from a string (for
* example, data returned from a database.)
*
* [Author]
*
* Andrew Collington <php@amnuts.com> <http://php.amnuts.com/>
*
* [Feedback]
*
* There is message board at the following address:
*
* <http://php.amnuts.com/forums/>
*
* Please use that to post up any comments, questions, bug reports, etc. You
* can also use the board to show off your use of the script.
*
* [Support]
*
* If you like this script, or any of my others, then please take a moment
* to consider giving a donation. This will encourage me to make updates and
* create new scripts which I would make available to you. If you would like
* to donate anything, then there is a link from my website to PayPal.
*
* [Examples of use]
*
* require('class.cropcanvas.php');
* $cc =& new CropCanvas();
*
* $cc->loadImage('original1.png');
* $cc->cropBySize(100, 100, ccBOTTOMRIGHT);
* $cc->saveImage('final1.png');
*
* $cc->flushImages(false);
*
* $cc->cropByPercent(15, 50, ccCENTER);
* $cc->saveImage('final2.jpg', 90);
*
* $cc->flushImages(true);
*
* $cc->loadImage('original3.png');
* $cc->cropToDimensions(67, 37, 420, 255);
* $cc->showImage('png');
*/
define("ccTOPLEFT", 0);
define("ccTOP", 1);
define("ccTOPRIGHT", 2);
define("ccLEFT", 3);
define("ccCENTRE", 4);
define("ccCENTER", 4);
define("ccRIGHT", 5);
define("ccBOTTOMLEFT", 6);
define("ccBOTTOM", 7);
define("ccBOTTOMRIGHT", 8);
/**
* This class extends the cropCanvas class purely to support and class name
* change and facilitate backwards compatability.
*/
class canvasCrop extends CropCanvas
{
/**
* Class constructor.
*
* @param string $debug
* @return cavasCrop
* @access public
*/
function cavasCrop($debug = false)
{
parent::CropCanvas($debug);
}
}
/**
* The newly renamed class.
*/
class CropCanvas
{
var $_imgOrig = null;
var $_imgFinal = null;
var $_showDebug = false;
var $gdInfo = array();
/**
* Class constructor.
*
* @param string $debug
* @return cropCanvas
* @access public
*/
function CropCanvas($debug = false)
{
$this->setDebugging($debug);
$this->gdInfo = $this->getGDInfo();
}
/**
* Toggles debugging.
*
* @param bool $do
* @return void
* @access public
*/
function setDebugging($do = false)
{
$this->_showDebug = ($do === true) ? true : false;
}
/**
* Load an image from the file system.
*
* An image is loaded using the appropriate function by automatically
* determining the file extension and then seeing if there is support
* for it in the user's installation of GD.
*
* @param string $filename
* @return bool
* @access public
*/
function loadImage($filename)
{
$ext = strtolower($this->_getExtension($filename));
$func = 'imagecreatefrom' . ($ext == 'jpg' ? 'jpeg' : $ext);
if (!$this->_isSupported($filename, $ext, $func, false)) {
return false;
}
$this->_imgOrig = $func($filename);
if ($this->_imgOrig == null) {
$this->_debug("The image could not be created from the '$filename' file using the '$func' function.");
return false;
}
return true;
}
/**
* Load an image from a string (eg. from a database table)
*
* @param string $string
* @return bool
* @access public
*/
function loadImageFromString($string)
{
$this->_imgOrig = imagecreatefromstring($string);
if (!$this->_imgOrig) {
$this->_debug('The image (supplied as a string) could not be created.');
return false;
}
return true;
}
/**
* Save the cropped image
*
* @param string $filename
* @param int $quality
* @param string $forcetype
* @return bool
* @access public
*/
function saveImage($filename, $quality = 90, $forcetype = '')
{
if ($this->_imgFinal == null) {
$this->_debug('There is no cropped image to save.');
return false;
}
$ext = ($forcetype == '') ? $this->_getExtension($filename) : strtolower($forcetype);
$func = 'image' . ($ext == 'jpg' ? 'jpeg' : $ext);
if (!$this->_isSupported($filename, $ext, $func, true)) {
return false;
}
$saved = false;
switch($ext) {
case 'gif':
if ($this->gdInfo['Truecolor Support'] && imageistruecolor($this->_imgFinal)) {
imagetruecolortopalette($this->_imgFinal, false, 255);
}
case 'png':
$saved = $func($this->_imgFinal, $filename);
break;
case 'jpg':
$saved = $func($this->_imgFinal, $filename, $quality);
break;
}
if ($saved == false) {
$this->_debug("The image could not be saved to the '$filename' file as the file type '$ext' using the '$func' function.");
return false;
}
return true;
}
/**
* Shows the masked image without any saving
*
* @param string $type
* @param int $quality
* @return bool
* @access public
*/
function showImage($type = 'png', $quality = 90)
{
if ($this->_imgFinal == null) {
$this->_debug('There is no cropped image to show.');
return false;
}
$type = strtolower($type);
$func = 'image' . ($type == 'jpg' ? 'jpeg' : $type);
$head = 'image/' . ($type == 'jpg' ? 'jpeg' : $type);
if (!$this->_isSupported('[showing file]', $type, $func, false)) {
return false;
}
header("Content-type: $head");
switch($type) {
case 'gif':
if ($this->gdInfo['Truecolor Support'] && imageistruecolor($this->_imgFinal)) {
imagetruecolortopalette($this->_imgFinal, false, 255);
}
case 'png':
$func($this->_imgFinal);
break;
case 'jpg':
$func($this->_imgFinal, '', $quality);
break;
}
return true;
}
/**
* Determines the dimensions for cropping image by a certain amount.
*
* @param int $x
* @param int $y
* @param int $position
* @return bool
* @access public
*/
function cropBySize($x, $y, $position = ccCENTRE)
{
$nx = (!$x) ? imagesx($this->_imgOrig) : imagesx($this->_imgOrig) - $x;
$ny = (!$y) ? imagesy($this->_imgOrig) : imagesy($this->_imgOrig) - $y;
return ($this->_cropSize(-1, -1, $nx, $ny, $position));
}
/**
* Determines the dimensions for cropping image to a certain size.
*
* @param int $x
* @param int $y
* @param int $position
* @return bool
* @access public
*/
function cropToSize($x, $y, $position = ccCENTRE)
{
return ($this->_cropSize(-1, -1, ($x <= 0 ? 1 : $x), ($y <= 0 ? 1 : $y), $position));
}
/**
* Used for cropping at a specific location (given start x/y and end x/y).
*
* @param int $sx
* @param int $sy
* @param int $ex
* @param int $ey
* @return bool
* @access public
*/
function cropToDimensions($sx, $sy, $ex, $ey)
{
return ($this->_cropSize($sx, $sy, abs($ex - $sx), abs($ey - $sy), null));
}
/**
* Determines the dimensions for cropping image by a certain amount.
*
* Calculations based on the size given as a percentage of the image size.
*
* @param int $px
* @param int $py
* @param int $position
* @return bool
* @access public
*/
function cropByPercent($px, $py, $position = ccCENTRE)
{
$nx = (!$px) ? imagesx($this->_imgOrig) : (imagesx($this->_imgOrig) - (($px / 100) * imagesx($this->_imgOrig)));
$ny = (!$py) ? imagesy($this->_imgOrig) : (imagesy($this->_imgOrig) - (($py / 100) * imagesy($this->_imgOrig)));
return ($this->_cropSize(-1, -1, $nx, $ny, $position));
}
/**
* Determines the dimensions for cropping image to a certain size.
*
* Calculations based on the size given as a percentage of the image size.
*
* @param int $px
* @param int $py
* @param int $position
* @return bool
* @access public
*/
function cropToPercent($px, $py, $position = ccCENTRE)
{
$nx = (!$px) ? imagesx($this->_imgOrig) : (($px / 100) * imagesx($this->_imgOrig));
$ny = (!$py) ? imagesy($this->_imgOrig) : (($py / 100) * imagesy($this->_imgOrig));
return ($this->_cropSize(-1, -1, $nx, $ny, $position));
}
/**
* Determines cropping dimensions based on threshold level.
*
* The threshold scale is 0 (black) to 255 (white).
*
* @param int $threshold
* @return bool
* @access public
*/
function cropByAuto($threshold = 254)
{
if ($threshold < 0) {
$threshold = 0;
}
if ($threshold > 255) {
$threshold = 255;
}
$sizex = imagesx($this->_imgOrig);
$sizey = imagesy($this->_imgOrig);
$sx = $sy = $ex = $ey = -1;
for ($y = 0; $y < $sizey; $y++) {
for ($x = 0; $x < $sizex; $x++) {
if ($threshold >= $this->_getThresholdValue($this->_imgOrig, $x, $y)) {
if ($sy == -1) {
$sy = $y;
} else {
$ey = $y;
}
if ($sx == -1) {
$sx = $x;
} else {
if ($x < $sx) {
$sx = $x;
} else if ($x > $ex) {
$ex = $x;
}
}
}
}
}
return ($this->_cropSize($sx, $sy, abs($ex - $sx), abs($ey - $sy), ccTOPLEFT));
}
/**
* Destroy the resources used by the images.
*
* @param bool $original
* @return void
* @access public
*/
function flushImages($original = true)
{
imagedestroy($this->_imgFinal);
$this->_imgFinal = null;
if ($original) {
imagedestroy($this->_imgOrig);
$this->_imgOrig = null;
}
}
/**
* Creates the cropped image based on passed parameters
*
* @param int $ox Original image width
* @param int $oy Original image height
* @param int $nx New width
* @param int $ny New height
* @param int $position Where to place the crop
* @return bool
*/
function _cropSize($ox, $oy, $nx, $ny, $position)
{
if ($this->_imgOrig == null) {
$this->_debug('The original image has not been loaded.');
return false;
}
if (($nx <= 0) || ($ny <= 0)) {
$this->_debug('The image could not be cropped because the size given is not valid.');
return false;
}
if (($nx > imagesx($this->_imgOrig)) || ($ny > imagesy($this->_imgOrig))) {
$this->_debug('The image could not be cropped because the size given is larger than the original image.');
return false;
}
if ($ox == -1 || $oy == -1) {
list($ox, $oy) = $this->_getCopyPosition($nx, $ny, $position);
}
if ($this->gdInfo['Truecolor Support']) {
$this->_imgFinal = imagecreatetruecolor($nx, $ny);
imagecopyresampled($this->_imgFinal, $this->_imgOrig, 0, 0, $ox, $oy, $nx, $ny, $nx, $ny);
} else {
$this->_imgFinal = imagecreate($nx, $ny);
imagecopyresized($this->_imgFinal, $this->_imgOrig, 0, 0, $ox, $oy, $nx, $ny, $nx, $ny);
}
return true;
}
/**
* Determine position of the crop.
*
* @param int $nx
* @param int $ny
* @param int $position
* @return array
*/
function _getCopyPosition($nx, $ny, $position)
{
$ox = imagesx($this->_imgOrig);
$oy = imagesy($this->_imgOrig);
switch($position) {
case ccTOPLEFT:
return array(0, 0);
case ccTOP:
return array(ceil(($ox - $nx) / 2), 0);
case ccTOPRIGHT:
return array(($ox - $nx), 0);
case ccLEFT:
return array(0, ceil(($oy - $ny) / 2));
case ccCENTRE:
return array(ceil(($ox - $nx) / 2), ceil(($oy - $ny) / 2));
case ccRIGHT:
return array(($ox - $nx), ceil(($oy - $ny) / 2));
case ccBOTTOMLEFT:
return array(0, ($oy - $ny));
case ccBOTTOM:
return array(ceil(($ox - $nx) / 2), ($oy - $ny));
case ccBOTTOMRIGHT:
return array(($ox - $nx), ($oy - $ny));
}
return array();
}
/**
* Determines the intensity value of a pixel at the passed co-ordinates.
*
* @param resource $im
* @param int $x
* @param int $y
* @return float
*/
function _getThresholdValue($im, $x, $y)
{
$rgb = imagecolorat($im, $x, $y);
$r = ($rgb >> 16) & 0xFF;
$g = ($rgb >> 8) & 0xFF;
$b = $rgb & 0xFF;
return (($r + $g + $b) / 3);
}
/**
* Get the extension of a file name
*
* @param string $file
* @return string
*/
function _getExtension($file)
{
$ext = '';
if (strrpos($file, '.')) {
$ext = strtolower(substr($file, (strrpos($file, '.') ? strrpos($file, '.') + 1 : strlen($file)), strlen($file)));
}
return $ext;
}
/**
* Validate whether image reading/writing routines are valid.
*
* @param string $filename
* @param string $extension
* @param string $function
* @param bool $write
* @return bool
* @access private
*/
function _isSupported($filename, $extension, $function, $write = false)
{
$giftype = ($write) ? ' Create Support' : ' Read Support';
$support = strtoupper($extension) . ($extension == 'gif' ? $giftype : ' Support');
if (!isset($this->gdInfo[$support]) || $this->gdInfo[$support] == false) {
$request = ($write) ? 'saving' : 'reading';
$this->_debug("Support for $request the file type '$extension' cannot be found.");
return false;
}
if (!function_exists($function)) {
$request = ($write) ? 'save' : 'read';
$this->_debug("The '$function' function required to $request the '$filename' file cannot be found.");
return false;
}
return true;
}
/**
* Gathers the GD version information
*
* Sometimes a check for the GD version like this:
*
* (function_exists('imagecreatetruecolor')) ? 2 : 1;
*
* can fail (at least, in my experience). This method retrieves the GD
* information based on what phpinfo() reports to be installed.
*
* @param bool $justVersion
* @return array
* @access public
*/
function getGDInfo($justVersion = false)
{
$gdinfo = array();
if (function_exists('gd_info')) {
$gdinfo = gd_info();
} else {
$gd = array(
'GD Version' => '',
'FreeType Support' => false,
'FreeType Linkage' => '',
'T1Lib Support' => false,
'GIF Read Support' => false,
'GIF Create Support' => false,
'JPG Support' => false,
'PNG Support' => false,
'WBMP Support' => false,
'XBM Support' => false
);
ob_start();
phpinfo();
$buffer = ob_get_contents();
ob_end_clean();
foreach (explode("\n", $buffer) as $line) {
$line = array_map('trim', (explode('|', strip_tags(str_replace('</td>', '|', $line)))));
if (isset($gd[$line[0]])) {
if (strtolower($line[1]) == 'enabled') {
$gd[$line[0]] = true;
} else {
$gd[$line[0]] = $line[1];
}
}
}
$gdinfo = $gd;
}
if (isset($gdinfo['JIS-mapped Japanese Font Support'])) {
unset($gdinfo['JIS-mapped Japanese Font Support']);
}
if (function_exists('imagecreatefromgd')) {
$gdinfo['GD Support'] = true;
}
if (function_exists('imagecreatefromgd2')) {
$gdinfo['GD2 Support'] = true;
}
if (preg_match('/^(bundled|2)/', $gdinfo['GD Version'])) {
$gdinfo['Truecolor Support'] = true;
} else {
$gdinfo['Truecolor Support'] = false;
}
if ($gdinfo['GD Version'] != '') {
$match = array();
if (preg_match('/([0-9\.]+)/', $gdinfo['GD Version'], $match)) {
$foo = explode('.', $match[0]);
$gdinfo['Version'] = array('major' => $foo[0], 'minor' => $foo[1], 'patch' => $foo[2]);
}
}
return ($justVersion) ? $gdinfo['Version'] : $gdinfo;
}
/**
* Display some simple textual deugging.
*
* @param string $string
* @return void
* @access private
*/
function _debug($string)
{
if ($this->_showDebug) {
echo '<p class="debug">', $string, "</p>\n";
}
}
}
?>
18.06kb in size
last modified Jun 26, 2006 at 2:05am
16654 views, 13754 downloads
class.cropinterface.php
An extension to the crop canvas class which provides an interactive cropping area for an image. Very easy to use and implement.
16.46kb in size
last modified Nov 29, 2006 at 6:35am
9985 views, 10422 downloads
inc.cropinterface.php
Part of the crop interface class, this required file provides the actual HTML and Javascript for the interface itself.
The interface is based on div tags and CSS for complete flexability.
8.21kb in size
last modified Nov 29, 2006 at 6:35am
5601 views, 4762 downloads
inc.cropjavascript.php
Part of the crop interface class, this required file provides the initiation of the javascript elements and must be called at the end of your HTML, just before the closing body tag.
1.34kb in size
last modified Nov 29, 2006 at 6:35am
4664 views, 4399 downloads
inc.cropimage.php
Part of the crop interface class, this required file provides a gateway to create a dynamically resized image.
713b in size
last modified Nov 29, 2006 at 6:35am
6330 views, 4632 downloads
test.cropcanvas.php
796b in size
last modified Jun 26, 2006 at 2:05am
11154 views, 10600 downloads
test.cropinterface.php
1.33kb in size
last modified Nov 29, 2006 at 6:35am
7938 views, 9484 downloads
wz_dragdrop.js
38.45kb in size
last modified May 4, 2006 at 2:41pm
9472 downloads
transparentpixel.gif
Provided as part of the wz_dragdrop.js library to provide backwards compatability for older browsers.
43b in size
last modified Jan 14, 2006 at 12:47pm
6536 views, 9401 downloads
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