/**
* 生成验证码图像，返回 QView_Output 对象
*
* $param string $code
*
* @return QView_Output
*/
function generateImage($code)
{
// 根据选项确定绘图选项
$padding = intval($this->_options['padding']);
if ($padding < 0) {
$padding = 0;
}
$color = $this->_options['color'];
$bgcolor = $this->_options['bgcolor'];
$border = $this->_options['border'];
$bdcolor = $this->_options['bdcolor'];
$float_pixel = intval($this->_options['float_pixel']);
// 确定要使用的字体
if (is_int($this->_options['font'])) {
$font = intval($this->_options['font']);
if ($font < 0 || $font > 5) {
$font = 5;
}
} else {
$font = imageloadfont($this->_options['font']);
}
// 确定字体宽度和高度
$font_width = imagefontwidth($font);
$font_height = imagefontheight($font);
// 确定图像的宽度和高度
$width = $font_width * strlen($code) + $padding * 2 + $border * 2 + 1;
$height = $font_height + $padding * 2 + $border * 2 + 1 + $float_pixel;
// 创建图像
$img = imagecreate($width, $height);
// 绘制边框
if ($border) {
list($r, $g, $b) = Helper_ImgCode::hex2rgb($bdcolor);
$color = imagecolorallocate($img, $r, $g, $b);
imagefilledrectangle($img, 0, 0, $width, $height, $color);
}
// 绘制背景
list($r, $g, $b) = Helper_ImgCode::hex2rgb($bgcolor);
$color = imagecolorallocate($img, $r, $g, $b);
imagefilledrectangle($img, $border, $border, $width - $border - 1, $height - $border - 1, $color);
// 绘制文字
list($r, $g, $b) = Helper_ImgCode::hex2rgb($color);
$color = imagecolorallocate($img, $r, $g, $b);
for ($i = 0, $max = strlen($code); $i < $max; $i++) {
imagestring($img, $font, $padding + $border + $font_width * $i, $padding + $border + mt_rand(0, $float_pixel), $code[$i], $color);
}
$filename = 'imgcode-' . mt_rand();
ob_start();
// 输出图像
switch (strtolower($this->_options['image_type'])) {
case 'png':
$filename .= '.png';
$mime = image_type_to_mime_type(IMAGETYPE_PNG);
imagepng($img);
break;
case 'gif':
$filename .= '.gif';
$mime = image_type_to_mime_type(IMAGETYPE_GIF);
imagegif($img);
break;
case 'jpg':
default:
$filename .= '.jpg';
$mime = image_type_to_mime_type(IMAGETYPE_JPEG);
imagejpeg($img);
}
imagedestroy($img);
unset($img);
$output = new QView_Output($filename, $mime, ob_get_clean());
$output->contentDisposition('inline')->enableClientCache(false);
return $output;
}
