Viewing file:  RandomImageText.php (3.9 KB) -rw-rw-rw-
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<?php
/**
* @package SPLIB
* @version $Id: RandomImageText.php,v 1.2 2005/09/22 05:14:24 kevin Exp $
*/
/**
* RandomImageText<br />
* Generate image text which is hard for OCR programs to
* read but can still be read by humans, for use in registration
* systems.
* @package SPLIB
* @access public
*/
class RandomImageText {
/**
* The background image resource
* @access private
* @var resource
*/
var $image;
/**
* Image height in pixels
* @access private
* @var int
*/
var $iHeight;
/**
* Image width in pixels
* @access private
* @var int
*/
var $iWidth;
/**
* Font height in pixels
* @access private
* @var int
*/
var $fHeight;
/**
* Font width in pixels
* @access private
* @var int
*/
var $fWidth;
/**
* Tracks the x position in pixels
* @access private
* @var int
*/
var $xPos;
/**
* An array of font idenfiers
* @access private
* @var array
*/
var $fonts;
/**
* RandomImageText constructor
* @param string relative or full path to background jpeg
* @param int font height to use
* @param int font width to use
* @access public
*/
function RandomImageText ($jpeg,$fHeight=10,$fWidth=10) {
$this->image=ImageCreateFromJPEG($jpeg);
$this->iHeight = ImageSY($this->image);
$this->iWidth = ImageSX($this->image);
$this->fHeight=$fHeight;
$this->fWidth=$fWidth;
$this->xPos=0;
$this->fonts=array(2,3,4,5);
}
/**
* Add text to the image which is "randomized"
* @param string text to add
* @param int red hex value (0-255)
* @param int green hex value (0-255)
* @param int blue hex value (0-255)
* @return boolean true text was added successfully
* @access public
*/
function addText ($text,$r=38,$g=38,$b=38) {
$length = $this->fWidth * strlen($text);
if ( $length >= ($this->iWidth-($this->fWidth*2)) ) {
return false;
}
$this->xPos = floor ( ( $this->iWidth - $length ) / 2 );
$fColor = ImageColorAllocate($this->image,$r,$g,$b);
srand ((float)microtime()*1000000);
$fonts=$this->fonts;
$yStart=floor ( $this->iHeight / 2 ) - $this->fHeight;
$yEnd=$yStart + $this->fHeight;
$yPos=range($yStart,$yEnd);
for ( $strPos=0;$strPos < $length; $strPos++ ) {
shuffle($fonts);
shuffle($yPos);
ImageString($this->image,
$fonts[0],
$this->xPos,
$yPos[0],
substr($text,$strPos,1),
$fColor);
$this->xPos+=$this->fWidth;
}
return true;
}
/**
* Empties any fonts currently stored for use
* @return void
* @access public
*/
function clearFonts () {
return $this->fonts=array();
}
/**
* Adds a new font for use in text generation
* @param string relative or full path to font file
* @return void
* @access public
*/
function addFont ($font) {
$this->fonts[]=imageloadfont($font);
}
/**
* Returns the height of the background image in
* pixels
* @return int
* @access public
*/
function getHeight () {
return $this->iHeight;
}
/**
* Returns the width of the background image in
* pixels
* @return int
* @access public
*/
function getWidth () {
return $this->iWidth;
}
/**
* Returns the image resource for use with
* the ImageJpeg() function
* @return resource
* @access public
*/
function getImage () {
return $this->image;
}
}
?>
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