/**
* 生成验证码图像，返回 QView_Output 对象
*
* $param string $code
*
* @return QView_Output
*/
function generateImage($code)
{
// 确定要使用的字体
if (isset(self::$_font_list[$this->_options['font']])) {
$font = Q_DIR . '/_resources/' . self::$_font_list[$this->_options['font']];
} else {
$font = $this->_options['font'];
}
// 确定图像的宽度和高度
$border = $this->_options['border'];
$float_pixel = intval($this->_options['float_pixel']);
$padding = intval($this->_options['padding']);
$width = intval($this->_options['width']) + $padding * 2 + $border * 2 + 1;
$width *= 2;
$height = intval($this->_options['height']) + $padding * 2 + $border * 2 + 1 + $float_pixel;
// 创建图像
$img = imagecreatetruecolor($width, $height);
// 绘制背景
list($r, $g, $b) = Helper_ImgCode::hex2rgb($this->_options['bgcolor']);
imagefilledrectangle($img, $border, $border, $width - $border - 1, $height - $border - 1, imagecolorallocate($img, $r, $g, $b));
// 绘制文字
$max_angle = intval($this->_options['max_angle']);
$x = $padding + $padding + $border;
$bottom = $height - $padding + $border - $float_pixel * 2;
$font_space = $this->_options['font_space'];
$color_arr = Helper_ImgCode::hex2rgb($this->_options['color']);
$arr = array();
$font_size = $this->_options['font_size'];
$min_r = $r + 50;
$min_g = $g + 50;
$min_b = $b + 50;
for ($i = 0, $max = strlen($code); $i < $max; $i++) {
$arr[$i]['font_size'] = mt_rand(50, 150) / 100 * $font_size;
$arr[$i]['angle'] = rand(0, $max_angle) - $max_angle / 2;
list($r, $g, $b) = $color_arr;
$r = ($r + rand(0, 2550)) % (255 - $min_r) + $min_r;
$g = ($g + rand(0, 2550)) % (255 - $min_g) + $min_g;
$b = ($b + rand(0, 2550)) % (255 - $min_b) + $min_b;
$arr[$i]['color'] = imagecolorallocate($img, $r, $g, $b);
}
for ($i = 0; $i < $max; $i++) {
$x += $font_space;
$y = $bottom;
list(, , $x) = imagettftext($img, $arr[$i]['font_size'], $arr[$i]['angle'], $x, $y, $arr[$i]['color'], $font, $code[$i]);
imagecolordeallocate($img, $arr[$i]['color']);
}
$new_width = intval($this->_options['width']) + $padding * 2 + $border * 2 + 1;
$img_output = imagecreatetruecolor($new_width, $height);
imagecopyresampled($img_output, $img, 0, 0, 0, 0, $new_width, $height, $x + $padding + $border, $height);
imagedestroy($img);
// 绘制边框
if ($border) {
list($r, $g, $b) = Helper_ImgCode::hex2rgb($this->_options['bdcolor']);
imagerectangle($img_output, 0, 0, $width, $height, imagecolorallocate($img_output, $r, $g, $b));
}
$filename = 'imgcode-' . mt_rand();
ob_start();
// 输出图像
switch (strtolower($this->_options['image_type'])) {
case 'png':
$filename .= '.png';
$mime = image_type_to_mime_type(IMAGETYPE_PNG);
imagepng($img_output);
break;
case 'gif':
$filename .= '.gif';
$mime = image_type_to_mime_type(IMAGETYPE_GIF);
imagegif($img_output);
break;
case 'jpg':
default:
$filename .= '.jpg';
$mime = image_type_to_mime_type(IMAGETYPE_JPEG);
imagejpeg($img_output);
}
imagedestroy($img_output);
$output = new QView_Output($filename, $mime, ob_get_clean());
$output->enableClientCache(false);
return $output;
}
