/trunk/library/Dnez/Captcha/Image.php

<?php



class Dnez_Captcha_Image extends Zend_Captcha_Image

{

    private $_transparent = false;



    private $_textColor = array('r'=>0, 'g'=>0, 'b'=> 0);



    private $_backGroundColor = array('r'=>0, 'g'=>0, 'b'=> 0);





    public function setTransparent($transparent)

    {

      $this->_transparent = $transparent;

      return $this;

    }



    public function setTextColor ($color = array('r'=>0, 'g'=>0, 'b'=> 0))

    {

      $this->_textColor = $color;

      return $this;

    }



    public function getTextColor ()

    {

      return $this->_textColor;

    }



    public function getTransparent()

    {

      return $this->_transparent;

    }



    public function setBackgroundColor ($color = array('r'=>0, 'g'=>0, 'b'=> 0))

    {

      $this->_backGroundColor = $color;

      return $this;

    }



    public function getBackgroundColor ()

    {

      return $this->_backGroundColor;

    }





    protected function _generateImage($id, $word)

    {

//        $word = strtoupper($word);

        $this->_dotNoiseLevel = 8;

        $this->_lineNoiseLevel = 1;



        if (!extension_loaded("gd")) {

            require_once 'Zend/Captcha/Exception.php';

            throw new Zend_Captcha_Exception("Image CAPTCHA requires GD extension");

        }



        if (!function_exists("imagepng")) {

            require_once 'Zend/Captcha/Exception.php';

            throw new Zend_Captcha_Exception("Image CAPTCHA requires PNG support");

        }



        if (!function_exists("imageftbbox")) {

            require_once 'Zend/Captcha/Exception.php';

            throw new Zend_Captcha_Exception("Image CAPTCHA requires FT fonts support");

        }



        $font = $this->getFont();



        if (empty($font)) {

            require_once 'Zend/Captcha/Exception.php';

            throw new Zend_Captcha_Exception("Image CAPTCHA requires font");

        }



        $w     = $this->getWidth();

        $h     = $this->getHeight();

        $fsize = $this->getFontSize();



        $img_file   = $this->getImgDir() . $id . $this->getSuffix();

        if(empty($this->_startImage)) {

            $img        = imagecreatetruecolor($w, $h);

        } else {

            $img = imagecreatefrompng($this->_startImage);

            if(!$img) {

                require_once 'Zend/Captcha/Exception.php';

                throw new Zend_Captcha_Exception("Can not load start image");

            }

            $w = imagesx($img);

            $h = imagesy($img);

        }



        $text_color = imagecolorallocate($img, 0, 0, 0);



        $bg_color   = imagecolorallocate($img, 255, 255, 255);

        imagefilledrectangle($img, 0, 0, $w-1, $h-1, $bg_color);



        $textbox = imageftbbox($fsize, 0, $font, $word);

        $x = ($w - ($textbox[2] - $textbox[0])) / 2;

        $y = ($h - ($textbox[7] - $textbox[1])) / 2;

        imagefttext($img, $fsize, 0, $x, $y, $text_color, $font, $word);



       // generate noise

//        for ($i=0; $i<$this->_dotNoiseLevel; $i++) {

//           imagefilledellipse($img, mt_rand(0,$w), mt_rand(0,$h), 2, 2, $text_color);

//        }

//        for($i=0; $i<$this->_lineNoiseLevel; $i++) {

//           imageline($img, mt_rand(0,$w), mt_rand(0,$h), mt_rand(0,$w), mt_rand(0,$h), $text_color);

//        }



        // transformed image

        $img2     = imagecreatetruecolor($w, $h);



        //build image depending on transparency

        if($this->_transparent) {

          imagealphablending($img2, false);

//          $bg_color = imagecolorallocatealpha($img2,255,255,255,127);

          $bg_color = imagecolorallocatealpha($img2,  $this->_backGroundColor['r'],$this->_backGroundColor['g'],$this->_backGroundColor['b'],127);//242,202,239,127);

          imagefilledrectangle($img2, 0, 0, $w-1, $h-1, $bg_color);

          imagealphablending($img2,true);

        } else {

          $img2     = imagecreatetruecolor($w, $h);

//          $bg_color = imagecolorallocate($img2, 255, 255, 255);

//          $bg_color = imagecolorallocate($img2, 242,204,239);

          $bg_color = imagecolorallocatealpha($img2,  $this->_backGroundColor['r'],$this->_backGroundColor['g'],$this->_backGroundColor['b'], 0);

          imagefilledrectangle($img2, 0, 0, $w-1, $h-1, $bg_color);

        }



//        $bg_color = imagecolorallocate($img2, 255, 255, 255);

//        imagefilledrectangle($img2, 0, 0, $w-1, $h-1, $bg_color);

        // apply wave transforms

        $freq1 = $this->_randomFreq();

        $freq2 = $this->_randomFreq();

        $freq3 = $this->_randomFreq();

        $freq4 = $this->_randomFreq();



        $ph1 = $this->_randomPhase();

        $ph2 = $this->_randomPhase();

        $ph3 = $this->_randomPhase();

        $ph4 = $this->_randomPhase();



        $szx = $this->_randomSize();

        $szy = $this->_randomSize();



    for ($x = 0; $x < $w; $x++) {

            for ($y = 0; $y < $h; $y++) {

                $sx = $x + (sin($x*$freq1 + $ph1) + sin($y*$freq3 + $ph3));

                $sy = $y + (sin($x*$freq2 + $ph2) + sin($y*$freq4 + $ph4));



                if ($sx < 0 || $sy < 0 || $sx >= $w - 1 || $sy >= $h - 1) {

                    continue;

                } else {

                    $color    = (imagecolorat($img, $sx, $sy) >> 16)         & 0xFF;

                    $color_x  = (imagecolorat($img, $sx + 1, $sy) >> 16)     & 0xFF;

                    $color_y  = (imagecolorat($img, $sx, $sy + 1) >> 16)     & 0xFF;

                    $color_xy = (imagecolorat($img, $sx + 1, $sy + 1) >> 16) & 0xFF;

                }

                if ($color == 255 && $color_x == 255 && $color_y == 255 && $color_xy == 255) {

                    // ignore background

                    continue;

                } elseif ($color == 0 && $color_x == 0 && $color_y == 0 && $color_xy == 0) {

                    // transfer inside of the image as-is

                    $newcolor = 0;

                } else {

                    // do antialiasing for border items

                    $frac_x  = $sx-floor($sx);

                    $frac_y  = $sy-floor($sy);

                    $frac_x1 = 1-$frac_x;

                    $frac_y1 = 1-$frac_y;



                    $newcolor = $color    * $frac_x1 * $frac_y1

                              + $color_x  * $frac_x  * $frac_y1

                              + $color_y  * $frac_x1 * $frac_y

                              + $color_xy * $frac_x  * $frac_y;

                }

                imagesetpixel($img2, $x, $y, imagecolorallocate($img2, $newcolor, $newcolor, $newcolor));

            }

        }



        // generate noise

        for ($i=0; $i<$this->_dotNoiseLevel; $i++) {

            imagefilledellipse($img2, mt_rand(0,$w), mt_rand(0,$h), 2, 2, $text_color);

        }

        for ($i=0; $i<$this->_lineNoiseLevel; $i++) {

           imageline($img2, mt_rand(0,$w), mt_rand(0,$h), mt_rand(0,$w), mt_rand(0,$h), $text_color);

        }



        imagealphablending($img2,false);



        imagesavealpha($img2,true);



        imagepng($img2, $img_file);

        imagedestroy($img);

        imagedestroy($img2);

    }



    /**

     * Display the captcha

     *

     * @param Zend_View_Interface $view

     * @param mixed $element

     * @return string

     */

    public function render(Zend_View_Interface $view = null, $element = null)

    {

        return '<img width="'.$this->getWidth().'" height="'.$this->getHeight().'" alt="'.$this->getImgAlt().'" src="' . $this->getImgUrl() . $this->getId() . $this->getSuffix() . '" id="captchaImageId"/>';

    }



    

}