这里修改帝国的缩略图生成函数，使得能更好的适应瀑布流对缩率图的需求。该函数位于e/class/gd.php中。
当高度参数为10000的时候，以宽度为基准等比例缩放，高度不限。
当高度参数大于1万的时候，比如为10400，其含义为：以宽度为基准等比例缩放，高度限制为400像素，超过部分底部截取（保留上部）。
函数修改后如下：
//原文件,新文件,宽度,高度,维持比例
function ResizeImage($big_image_name, $new_name, $max_width = 400, $max_height = 400, $resize = 1){
if($max_height>10000){$max_height=$max_height-10000; $resize = 2;}
$returnr['file']='';
$returnr['filetype']='';
if($temp_img_type = @getimagesize($big_image_name)) {preg_match('//([a-z]+)$/i', $temp_img_type[mime], $tpn); $img_type = $tpn[1];}
else {preg_match('/.([a-z]+)$/i', $big_image_name, $tpn); $img_type = $tpn[1];}
$all_type = array(
"jpg" => array("create"=>"ImageCreateFromjpeg", "output"=>"imagejpeg" , "exn"=>".jpg"),
"gif" => array("create"=>"ImageCreateFromGIF" , "output"=>"imagegif" , "exn"=>".gif"),
"jpeg" => array("create"=>"ImageCreateFromjpeg", "output"=>"imagejpeg" , "exn"=>".jpg"),
"png" => array("create"=>"imagecreatefrompng" , "output"=>"imagepng" , "exn"=>".png"),
"wbmp" => array("create"=>"imagecreatefromwbmp", "output"=>"image2wbmp" , "exn"=>".wbmp")
);
$func_create = $all_type[$img_type]['create'];
if(empty($func_create) or !function_exists($func_create))
{
return $returnr;
}
//输出
$func_output = $all_type[$img_type]['output'];
$func_exname = $all_type[$img_type]['exn'];
if(($func_exname=='.gif'||$func_exname=='.png'||$func_exname=='.wbmp')&&!function_exists($func_output))
{
$func_output='imagejpeg';
$func_exname='.jpg';
}
$big_image = $func_create($big_image_name);
$big_width = imagesx($big_image);
$big_height = imagesy($big_image);
if($big_width <= $max_width and $big_height <= $max_height)
{
$func_output($big_image, $new_name.$func_exname);
$returnr['file']=$new_name.$func_exname;
$returnr['filetype']=$func_exname;
return $returnr;
}
$ratiow = $max_width / $big_width;
$ratioh = $max_height / $big_height;
// jiuhcecai add
if($max_height == 10000){
$ratioh=$ratiow;
$max_height=$ratioh* $big_height;
}
if($resize == 1) {
if($big_width >= $max_width and $big_height >= $max_height)
{
if($big_width > $big_height)
{
$tempx = $max_width / $ratioh;
$tempy = $big_height;
$srcX = ($big_width - $tempx) / 2;
$srcY = 0;
} else {
$tempy = $max_height / $ratiow;
$tempx = $big_width;
$srcY = ($big_height - $tempy) / 2;
$srcX = 0;
}
} else {
if($big_width > $big_height)
{
$tempx = $max_width;
$tempy = $big_height;
$srcX = ($big_width - $tempx) / 2;
$srcY = 0;
} else {
$tempy = $max_height;
$tempx = $big_width;
$srcY = ($big_height - $tempy) / 2;
$srcX = 0;
}
}
}elseif($resize == 2) // 以宽为准，适合瀑布流
{
$ratioh=$ratiow;
$tempHeight=$ratiow*$big_height;
$srcX = 0;
$srcY = 0;
$tempx = $big_width;
$tempy = $big_height;
if($tempHeight>$max_height)$tempy =$max_height/$ratiow;
$max_height=$ratiow*$tempy;
}else
{
$srcX = 0;
$srcY = 0;
$tempx = $big_width;
$tempy = $big_height;
}
$new_width = ($ratiow > 1) ? $big_width : $max_width;
$new_height = ($ratioh > 1) ? $big_height : $max_height;
if(function_exists("imagecopyresampled"))
{
$temp_image = imagecreatetruecolor($new_width, $new_height);
imagecopyresampled($temp_image, $big_image, 0, 0, $srcX, $srcY, $new_width, $new_height, $tempx, $tempy);
} else {
$temp_image = imagecreate($new_width, $new_height);
imagecopyresized($temp_image, $big_image, 0, 0, $srcX, $srcY, $new_width, $new_height, $tempx, $tempy);
}
$func_output($temp_image, $new_name.$func_exname);
ImageDestroy($big_image);
ImageDestroy($temp_image);
$returnr['file']=$new_name.$func_exname;
$returnr['filetype']=$func_exname;
return $returnr;
}
