/wordpress/plugins/cforms/cforms-captcha.php

<?php

$img_sz_type	= 0;

$img_sz_width	= ($_REQUEST['w']<>'')?$_REQUEST['w']:115;

$img_sz_height	= ($_REQUEST['h']<>'')?$_REQUEST['h']:25;



$im_bg			= 0;

$im_bg_type		= 1;

$im_bg_url		= 'captchabg/' . ( ($_REQUEST['b']<>'')?$_REQUEST['b']:'1.gif' );



$fontUsed		= 0; 

$font_url		= 'captchafonts/' . ( ($_REQUEST['f']<>'')?$_REQUEST['f']:'font4.ttf' );

$fonts_dir		= 'captchafonts';



$min_font_size	= ($_REQUEST['f1']<>'')?$_REQUEST['f1']:17;

$max_font_size	= ($_REQUEST['f2']<>'')?$_REQUEST['f2']:19;



$min_angle		= ($_REQUEST['a1']<>'')?$_REQUEST['a1']:-12;

$max_angle		= ($_REQUEST['a2']<>'')?$_REQUEST['a2']:12;



$col_txt_type	= 4;

$col			= ($_REQUEST['c']<>'')?$_REQUEST['c']:'000066';

$col_txt_r		= hexdec(substr($col,0,2));

$col_txt_g		= hexdec(substr($col,2,2));

$col_txt_b		= hexdec(substr($col,4,2)); 



$border			= ($_REQUEST['l']<>'')?$_REQUEST['l']:'000066';

$border_r		= hexdec(substr($border,0,2));

$border_g		= hexdec(substr($border,2,2));

$border_b		= hexdec(substr($border,4,2));



$char_padding	= 2;



# $output_type='jpeg';

$output_type='png';



//

// dont't change anything below this comment

//

@session_start();



$no     = ($_REQUEST['ts']<>'')?$_REQUEST['ts']:'';

$turing = $_SESSION['turing_string_'.$no];



if ($fontUsed == 1 ) {

	$fontno = mt_rand(1,34);

	$font = $fonts_dir . '/font' . $fontno . '.ttf';

	}

	else $font = $font_url;

                 

/* initialize variables */



$length = strlen($turing);

$data = array();

$image_width = $image_height = 0;



$codelen = 0;



/* build the data array of the characters, size, placement, etc. */



for($i=0; $i<$length; $i++) {



  $char = substr($turing, $i, 1);



  $size = mt_rand($min_font_size, $max_font_size);

  $angle = mt_rand($min_angle, $max_angle);



  $bbox = ImageTTFBBox( $size, $angle, $font, $char );



  $char_width = max($bbox[2], $bbox[4]) - min($bbox[0], $bbox[6]);

  $char_height = max($bbox[1], $bbox[3]) - min($bbox[7], $bbox[5]);



  $codelen = $codelen + $char_width + $char_padding;



  $image_width += $char_width + $char_padding;

  $image_height = max($image_height, $char_height);



  $data[] = array(

    'char'    => $char,

    'size'    => $size,

    'angle'    => $angle,

    'height'  => $char_height,

    'width'    => $char_width,

  );

}



/* calculate the final image size, adding some padding */



$x_padding = 12;



if ( $img_sz_type == 1 )

	{

	$image_width += ($x_padding * 2);

	$image_height = ($image_height * 1.5) + 2;

	}

   else {

	$image_width = $img_sz_width;

	$image_height = $img_sz_height;

	}



/* build the image, and allocte the colors */



$im = ImageCreate($image_width, $image_height);

$cs = mt_rand(1,3);



$d1 = $d2 = $d3 = 0;

while ( ($d1<50) AND ($d2<50) AND ($d3<50) )

	{

	$r = mt_rand(200,255);	$g = mt_rand(200,255);	$b = mt_rand(200,255);

	$d1 = abs($r-$g);	$d2 = abs($r-$b);	$d3 = abs($g-$b);

	}



$color_bg       = ImageColorAllocate($im, $r, $g, $b );

$color_border   = ImageColorAllocate($im, $border_r, $border_g, $border_b);

$color_line0    = ImageColorAllocate($im, round($r*0.85), round($g*0.85), round($b*0.85) );

$color_elipse0  = ImageColorAllocate($im, round($r*0.95), round($g*0.95), round($b*0.95) );

$color_elipse1  = ImageColorAllocate($im, round($r*0.90), round($g*0.90), round($b*0.90) );



$d1 = mt_rand(0,50); $d2 = mt_rand(0,50); $d3 = mt_rand(0,50);



$color_line1  = ImageColorAllocate($im, $r-$d1, $g-$d2, $b-$d3 );



$d1 = $d2 = $d3 = 0;

while ( ($d1<100) AND ($d2<100) AND ($d3<100) )

	{

	$r = mt_rand(0,150); $g = mt_rand(0,150); $b = mt_rand(0,150);

	$d1 = abs($r-$g); $d2 = abs($r-$b); $d3 = abs($g-$b);

	}



switch ( $col_txt_type ) 

	{

	case 1 : $col_txt    = ImageColorAllocate($im, $r, $g, $b ); break;

	case 2 : $col_txt    = ImageColorAllocate($im, 0, 0, 0 ); break;

	case 3 : $col_txt    = ImageColorAllocate($im, 255, 255, 255 );	break;

	case 4 : $col_txt    = ImageColorAllocate($im, $col_txt_r, $col_txt_g, $col_txt_b ); break;

	}



$noiset = mt_rand(1,2);



if ( $im_bg == 1 )

	{

		switch ($noiset) {

			case '1' :

					/* make the random background elipses */

				for($l=0; $l<10; $l++) {

			

			  		$c = 'color_elipse' . ($l%2);

			

					$cx = mt_rand(0, $image_width);

			  		$cy = mt_rand(0, $image_width);

			  		$rx = mt_rand(10, $image_width);

			  		$ry = mt_rand(10, $image_width);

			

					ImageFilledEllipse($im, $cx, $cy, $rx, $ry, $$c );

			  		}; break;

			case '2' :

					for($l=0; $l<10; $l++) {

			

							$c = 'color_line' . ($l%2);

					

					 	  	$lx = mt_rand(0, $image_width+$image_height);

					  		$lw = mt_rand(0,3);

					  		if ($lx > $image_width) {

					    		  $lx -= $image_width;

					    		  ImageFilledRectangle($im, 0, $lx, $image_width-1, $lx+$lw, $$c );

					  		   } else ImageFilledRectangle($im, $lx, 0, $lx+$lw, $image_height-1, $$c );

			  		}; break;

			} 

}



if ( $im_bg == 0 ){

	  	$image_data=getimagesize($im_bg_url);

	  	$image_type=$image_data[2];



	  	if($image_type==1) 		$img_src=imagecreatefromgif($im_bg_url);

	  	elseif($image_type==2)	$img_src=imagecreatefromjpeg($im_bg_url);

	  	elseif($image_type==3)	$img_src=imagecreatefrompng($im_bg_url);

	

		if ( $im_bg_type == 1 ) {

		  imagesettile($im,$img_src);

//		  imagefill($im,0,0,IMG_COLOR_TILED);

	      imageFilledRectangle ($im, 0, 0, $image_width, $image_height, IMG_COLOR_TILED);

		}

		else imagecopyresampled($im,$img_src,0,0,0,0,$image_width,$image_height,$image_data[0],$image_data[1]);

	

}



$pos_x = ($image_width - $codelen) / 2;

foreach($data as $d) {



	$pos_y = ( ( $image_height + $d['height'] ) / 2 );

	ImageTTFText($im, $d['size'], $d['angle'], $pos_x, $pos_y, $col_txt, $font, $d['char'] );

	

	$pos_x += $d['width'] + $char_padding;

	

}



/* a nice border */

ImageRectangle($im, 0, 0, $image_width-1, $image_height-1, $color_border);



	/* display it */

	switch ($output_type) {

			 case 'jpeg':

//					  Header('Expires: Mon, 26 Jul 1997 05:00:00 GMT');

//					  Header('Cache-Control: no-cache, must-revalidate');

					  Header('Content-type: image/jpeg');

					  ImageJPEG($im,NULL,100);

					  break;

			

			 case 'png':

			 default:

//					  Header('Expires: Mon, 26 Jul 1997 05:00:00 GMT');

//					  Header('Cache-Control: no-cache, must-revalidate');

					  Header('Content-type: image/png');

					  ImagePNG($im);

					  break;

	 }



ImageDestroy($im);



session_write_close();

?>