/**
* Create CAPTCHA image.
*
* This method creates a CAPTCHA image.
*
* @return void
* @throws Text_CAPTCHA_Exception when image generation with Image_Text produces
* an error
*/
public function createCAPTCHA()
{
$options['canvas'] = array('width' => $this->_width, 'height' => $this->_height);
$options['width'] = $this->_width - 20;
$options['height'] = $this->_height - 20;
$options['cx'] = ceil($this->_width / 2 + 10);
$options['cy'] = ceil($this->_height / 2 + 10);
$options['angle'] = rand(0, 30) - 15;
$options['font_size'] = $this->_imageOptions['font_size'];
$options['font_path'] = $this->_imageOptions['font_path'];
$options['font_file'] = $this->_imageOptions['font_file'];
$options['color'] = array($this->_imageOptions['text_color']);
$options['background_color'] = $this->_imageOptions['background_color'];
$options['max_lines'] = 1;
$options['mode'] = 'auto';
do {
$imageText = new Image_Text($this->getPhrase(), $options);
$imageText->init();
$result = $imageText->measurize();
} while ($result === false && --$options['font_size'] > 0);
if ($result === false) {
throw new Text_CAPTCHA_Exception('The text provided does not fit in the image dimensions');
}
$imageText->render();
$image = $imageText->getImg();
if ($this->_imageOptions['antialias'] && function_exists('imageantialias')) {
imageantialias($image, true);
}
$colors = Image_Text::convertString2RGB($this->_imageOptions['lines_color']);
$linesColor = imagecolorallocate($image, $colors['r'], $colors['g'], $colors['b']);
//some obfuscation
for ($i = 0; $i < 3; $i++) {
$x1 = rand(0, $this->_width - 1);
$y1 = rand(0, round($this->_height / 10, 0));
$x2 = rand(0, round($this->_width / 10, 0));
$y2 = rand(0, $this->_height - 1);
imageline($image, $x1, $y1, $x2, $y2, $linesColor);
$x1 = rand(0, $this->_width - 1);
$y1 = $this->_height - rand(1, round($this->_height / 10, 0));
$x2 = $this->_width - rand(1, round($this->_width / 10, 0));
$y2 = rand(0, $this->_height - 1);
imageline($image, $x1, $y1, $x2, $y2, $linesColor);
$cx = rand(0, $this->_width - 50) + 25;
$cy = rand(0, $this->_height - 50) + 25;
$w = rand(1, 24);
imagearc($image, $cx, $cy, $w, $w, 0, 360, $linesColor);
}
// @todo remove hardcoded value
$this->_output = 'jpg';
if ($this->_output == 'gif' && imagetypes() & IMG_GIF) {
$this->setCaptcha($this->_getCAPTCHAAsGIF($image));
} else {
if ($this->_output == 'jpg' && imagetypes() & IMG_JPG || $this->_output == 'jpeg' && imagetypes() & IMG_JPEG) {
$this->setCaptcha($this->_getCAPTCHAAsJPEG($image));
} else {
if ($this->_output == 'png' && imagetypes() & IMG_PNG) {
$this->setCaptcha($this->_getCAPTCHAAsPNG($image));
} else {
if ($this->_output == 'resource') {
$this->setCaptcha($image);
} else {
throw new Text_CAPTCHA_Exception("Unknown or unsupported output type specified");
}
}
}
}
imagedestroy($image);
}
/**
*
*/
public function test_convertString2RGB()
{
$this->assertEquals(array('r' => 255, 'g' => 255, 'b' => 255, 'a' => 0), Image_Text::_convertString2RGB('#FFFFFF'));
$this->assertEquals(array('r' => 255, 'g' => 255, 'b' => 255, 'a' => 0), Image_Text::_convertString2RGB('#00FFFFFF'));
$this->assertEquals(array('r' => 0, 'g' => 0, 'b' => 0, 'a' => 0), Image_Text::_convertString2RGB('#000000'));
$this->assertEquals(array('r' => 0, 'g' => 0, 'b' => 0, 'a' => 255), Image_Text::_convertString2RGB('#FF000000'));
}
/**
* Construct and initialize an Image_Text in one step.
* This method is called statically and creates plus initializes an Image_Text object.
* Beware: You will have to recall init() if you set an option afterwards manually.
*
* @param string $text Text to print.
* @param array $options Options.
* @access public
* @static
* @see Image_Text::set(), Image_Text::Image_Text(), Image_Text::init()
*/
function &construct($text, $options)
{
$itext = new Image_Text($text, $options);
$res = $itext->init();
if (PEAR::isError($res)) {
return $res;
}
return $itext;
}
/**
* Construct and initialize an Image_Text in one step.
* This method is called statically and creates plus initializes an Image_Text
* object. Beware: You will have to recall init() if you set an option afterwards
* manually.
*
* @param string $text Text to print.
* @param array $options Options.
*
* @return Image_Text
* @see Image_Text::set(), Image_Text::Image_Text(), Image_Text::init()
*/
public static function construct($text, $options)
{
$itext = new Image_Text($text, $options);
$itext->init();
return $itext;
}