123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197 |
- <?php
- /**
- * Lotus Captcha component is inspired by "cool-php-captcha" project
- * http://code.google.com/p/cool-php-captcha
- */
- class LtCaptchaImageEngine
- {
- public $conf;
- protected $maxWordLength = 9;
- /**
- * * Background color in RGB-array
- */
- protected $backgroundColor = array(255, 255, 255);
- /**
- * * Foreground colors in RGB-array
- */
- protected $colors = array(
- array(27, 78, 181), // blue
- array(22, 163, 35), // green
- array(214, 36, 7), // red
- );
- /**
- * * Shadow color in RGB-array or null
- */
- protected $shadowColor = null; //array(0, 0, 0);
-
- /**
- * Font configuration
- *
- * - font: TTF file
- * - spacing: relative pixel space between character
- * - minSize: min font size
- * - maxSize: max font size
- */
- protected $fonts = array('Antykwa' => array('spacing' => -3, 'minSize' => 27, 'maxSize' => 30, 'font' => 'AntykwaBold.ttf'),
- 'Candice' => array('spacing' => -1.5, 'minSize' => 28, 'maxSize' => 31, 'font' => 'Candice.ttf'),
- 'DingDong' => array('spacing' => -2, 'minSize' => 24, 'maxSize' => 30, 'font' => 'Ding-DongDaddyO.ttf'),
- 'Duality' => array('spacing' => -2, 'minSize' => 30, 'maxSize' => 38, 'font' => 'Duality.ttf'),
- 'Jura' => array('spacing' => -2, 'minSize' => 28, 'maxSize' => 32, 'font' => 'Jura.ttf'),
- 'StayPuft' => array('spacing' => -1.5, 'minSize' => 28, 'maxSize' => 32, 'font' => 'StayPuft.ttf'),
- 'Times' => array('spacing' => -2, 'minSize' => 28, 'maxSize' => 34, 'font' => 'TimesNewRomanBold.ttf'),
- 'VeraSans' => array('spacing' => -1, 'minSize' => 20, 'maxSize' => 28, 'font' => 'VeraSansBold.ttf'),
- );
- /**
- * * Wave configuracion in X and Y axes
- */
- protected $Yperiod = 12;
- protected $Yamplitude = 14;
- protected $Xperiod = 11;
- protected $Xamplitude = 5;
- /**
- * * GD image
- */
- protected $im;
- public function drawImage($text)
- {
- /**
- * * Initialization
- */
- $this->ImageAllocate();
- $fontcfg = $this->fonts[array_rand($this->fonts)];
- $this->WriteText($text, $fontcfg);
- /**
- * * Transformations
- */
- $this->WaveImage();
- if ($this->conf['blur'] && function_exists('imagefilter'))
- {
- imagefilter($this->im, IMG_FILTER_GAUSSIAN_BLUR);
- }
- $this->ReduceImage();
- return $this->im;
- }
- /**
- * Creates the image resources
- */
- protected function ImageAllocate()
- {
- // Cleanup
- if (!empty($this->im))
- {
- imagedestroy($this->im);
- }
- $this->im = imagecreatetruecolor($this->conf['width'] * $this->conf['scale'], $this->conf['height'] * $this->conf['scale']);
- // Background color
- $this->GdBgColor = imagecolorallocate($this->im,
- $this->backgroundColor[0],
- $this->backgroundColor[1],
- $this->backgroundColor[2]
- );
- imagefilledrectangle($this->im, 0, 0, $this->conf['width'] * $this->conf['scale'], $this->conf['height'] * $this->conf['scale'], $this->GdBgColor);
- // Foreground color
- $color = $this->colors[mt_rand(0, sizeof($this->colors)-1)];
- $this->GdFgColor = imagecolorallocate($this->im, $color[0], $color[1], $color[2]);
- // Shadow color
- if (!empty($this->shadowColor) && is_array($this->shadowColor) && sizeof($this->shadowColor) >= 3)
- {
- $this->GdShadowColor = imagecolorallocate($this->im,
- $this->shadowColor[0],
- $this->shadowColor[1],
- $this->shadowColor[2]
- );
- }
- }
- /**
- * Text insertion
- */
- protected function WriteText($text, $fontcfg = array())
- {
- if (empty($fontcfg))
- {
- // Select the font configuration
- $fontcfg = $this->fonts[array_rand($this->fonts)];
- }
- // Full path of font file
- $fontfile = dirname(__FILE__) . '/fonts/' . $fontcfg['font'];
- /**
- * * Increase font-size for shortest words: 9% for each glyp missing
- */
- $lettersMissing = $this->maxWordLength - strlen($text);
- $fontSizefactor = 1 + ($lettersMissing * 0.09);
- // Text generation (char by char)
- $x = 20 * $this->conf['scale'];
- $y = round(($this->conf['height'] * 27 / 40) * $this->conf['scale']);
- $length = strlen($text);
- for ($i = 0; $i < $length; $i++)
- {
- $degree = rand($this->conf['max_rotation'] * -1, $this->conf['max_rotation']);
- $fontsize = rand($fontcfg['minSize'], $fontcfg['maxSize']) * $this->conf['scale'] * $fontSizefactor;
- $letter = substr($text, $i, 1);
- if ($this->shadowColor)
- {
- $coords = imagettftext($this->im, $fontsize, $degree,
- $x + $this->conf['scale'], $y + $this->conf['scale'],
- $this->GdShadowColor, $fontfile, $letter);
- }
- $coords = imagettftext($this->im, $fontsize, $degree,
- $x, $y,
- $this->GdFgColor, $fontfile, $letter);
- $x += ($coords[2] - $x) + ($fontcfg['spacing'] * $this->conf['scale']);
- }
- }
- /**
- * Wave filter
- */
- protected function WaveImage()
- {
- // X-axis wave generation
- $xp = $this->conf['scale'] * $this->Xperiod * rand(1, 3);
- $k = rand(0, 100);
- for ($i = 0; $i < ($this->conf['width'] * $this->conf['scale']); $i++)
- {
- imagecopy($this->im, $this->im,
- $i-1, sin($k + $i / $xp) * ($this->conf['scale'] * $this->Xamplitude),
- $i, 0, 1, $this->conf['height'] * $this->conf['scale']);
- }
- // Y-axis wave generation
- $k = rand(0, 100);
- $yp = $this->conf['scale'] * $this->Yperiod * rand(1, 2);
- for ($i = 0; $i < ($this->conf['height'] * $this->conf['scale']); $i++)
- {
- imagecopy($this->im, $this->im,
- sin($k + $i / $yp) * ($this->conf['scale'] * $this->Yamplitude), $i-1,
- 0, $i, $this->conf['width'] * $this->conf['scale'], 1);
- }
- }
- /**
- * Reduce the image to the final size
- */
- protected function ReduceImage()
- {
- $imResampled = imagecreatetruecolor($this->conf['width'], $this->conf['height']);
- imagecopyresampled($imResampled, $this->im,
- 0, 0, 0, 0,
- $this->conf['width'], $this->conf['height'],
- $this->conf['width'] * $this->conf['scale'], $this->conf['height'] * $this->conf['scale']
- );
- imagedestroy($this->im);
- $this->im = $imResampled;
- }
- }
|