wuminghuo
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注册 2006-2-18
来自 郑州--北京
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[推荐阅读] 关于session跨页面传值问题
我这里有个办法，是先按照最大的比例缩略（例如：要求50＊50的图，原图200＊600，就先缩略为50＊150）
，然后再切去多余的部分，这样最大程度的保留了图片，而且不失真。
这里用的是ImageMagick，效率不错,用GD改改也可以的
<?php
class cutImgSvc
{/*{{{*/
const WIDTH = '80';
const HEIGHT = '80';
public static function cut($url,$articleID)
{/*{{{*/
if(empty($url) || empty($articleID))
return false;
$imgData = self::curlExec($url);
self::saveImg($imgData,$articleID);
self::makeSmallPic($articleID.".jpg",$articleID."_s.jpg",self::WIDTH,self::HEIGHT);
}/*}}}*/
static function curlExec($url, $timeout=1)
{ /*{{{*/
$ch = curl_init();
curl_setopt($ch, CURLOPT_VERBOSE, 1 );
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_TIMEOUT, $timeout);
curl_setopt($ch, CURLOPT_URL, $url);
$r = curl_exec($ch);
curl_close($ch);
return $r;
}/*}}}*/
static function saveImg($cutData,$articleID)
{/*{{{*/
self::writeFile($cutData,$articleID.".jpg");
}/*}}}*/
static function writeFile($string,$fname)
{/*{{{*/
$fp = fopen($fname,'w');
if($fp) {
if(flock($fp, LOCK_EX)) {
fwrite($fp, $string);
flock($fp, LOCK_UN);
return true;
}
}
return false;
}/*}}}*/
static function makeSmallPic($image,$small_pic,$thumbw,$thumbh)
{/*{{{*/
$size = getimagesize($image); // 获取原图大小
$orig_w=$size[0];
$orig_h=$size[1];
$width=$thumbw;
$height=$thumbh;
$source_image = $image;
$resize_image = $small_pic;
$commands = '';
if($orig_w>$orig_h)
{
$resized_w = ($height/$orig_h) * $orig_w;
$move = ($resized_w - $width);
if($move < 0)
{
$commands .= ' -resize "'.$width.'x"';
$commands .= ' -crop "'.$width.'x'.$height.'+0+0"';
}
else
{
$commands .= ' -geometry "x'.$height.'"';
$commands .= ' -crop "'.$width.'x'.$height.'+'.round($move/2).'+0"';
$commands .= ' +profile "*"';
}
}
else
{
$resized_h = ($width/$orig_w) * $orig_h;
$move = ($resized_h - $height);
if($move < 0)
{
$commands .= ' -resize "x'.$height.'"';
$commands .= ' -crop "'.$width.'x'.$height.'+0+0"';
}
else
{
$commands .= ' -geometry "'.$width.'x"';
$commands .= ' -crop "'.$width.'x'.$height.'+0+'.round($move/2).'"';
$commands .= ' +profile "*"';
}
}
$exec_str = "/usr/local/bin/convert".$commands." ".$source_image." ".$resize_image;
$r = exec($exec_str);
}/*}}}*/
}/*}}}*/
class ImageSvc
{/*{{{*/
public $width = 200;
public $height = 200;
public $fileDir = "./";
const EXT = 'thum';
public function __construct($width,$height,$fileDir)
{/*{{{*/
$this->width = $width;
$this->height = $height;
$this->filedir = $fileDir;
}/*}}}*/
static function instance($width=200,$height=200,$fileDir="./")
{/*{{{*/
return new ImageSvc($width,$height,$fileDir);
}/*}}}*/
public function getThumImgByUrl($imgUrl,$imgID)
{/*{{{*/
if(empty($imgUrl) || empty($imgID))
return false;
$sourceImg = $this->filedir.$imgID.".jpg";
$thumImg = $this->filedir.$imgID."_".self::EXT."_".$this->width."_".$this->height.".jpg";
if(file_exists($thumImg))
return '';
$r = self::saveImg($imgUrl,$sourceImg);
if(!$r)
{
print('no img file');
return false;
}
magickImgSvc::cutImage($sourceImg,$thumImg,$this->width,$this->height);
}/*}}}*/
static function saveImg($imgUrl,$imgFile)
{/*{{{*/
$imgData = self::curlExec($imgUrl);
return self::writeFile($imgData,$imgFile);
}/*}}}*/
static function curlExec($url, $timeout=1)
{ /*{{{*/
$ch = curl_init();
curl_setopt($ch, CURLOPT_VERBOSE, 1 );
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_TIMEOUT, $timeout);
curl_setopt($ch, CURLOPT_URL, $url);
$r = curl_exec($ch);
curl_close($ch);
return $r;
}/*}}}*/
static function writeFile($string,$fname)
{/*{{{*/
$fp = fopen($fname,'w');
if($fp) {
if(flock($fp, LOCK_EX)) {
fwrite($fp, $string);
flock($fp, LOCK_UN);
return true;
}
}
return false;
}/*}}}*/
}/*}}}*/
class magickImgSvc
{/*{{{*/
const IMAGEMAGICK = '/usr/local/bin';
static function cutImage($source_image,$resize_image,$width,$height)
{/*{{{*/
$size = getimagesize($source_image);
$orig_w=$size[0];
$orig_h=$size[1];
$commands = '';
if($orig_w>$orig_h)
{
$resized_w = ($height/$orig_h) * $orig_w;
$move = ($resized_w - $width);
if($move < 0)
{
$commands .= ' -resize "'.$width.'x"';
$commands .= ' -crop "'.$width.'x'.$height.'+0+0"';
}
else
{
$commands .= ' -geometry "x'.$height.'"';
$commands .= ' -crop "'.$width.'x'.$height.'+'.round($move/2).'+0"';
$commands .= ' +profile "*"';
}
}
else
{
$resized_h = ($width/$orig_w) * $orig_h;
$move = ($resized_h - $height);
if($move < 0)
{
$commands .= ' -resize "x'.$height.'"';
$commands .= ' -crop "'.$width.'x'.$height.'+0+0"';
}
else
{
$commands .= ' -geometry "'.$width.'x"';
$commands .= ' -crop "'.$width.'x'.$height.'+0+'.round($move/2).'"';
$commands .= ' +profile "*"';
}
}
$exec_str = self::IMAGEMAGICK."/convert".$commands." ".$source_image." ".$resize_image;
exec($exec_str);
}/*}}}*/
static function thumbnail($source_image,$resize_image,$width,$height)
{/*{{{*/
$str = self::IMAGEMAGICK."/convert -geometry ".$width."x".$height." ".$source_image." ".$resize_image;
exec($str);
}/*}}}*/
} /*}}}*/
$url[] = "http://forum.ubuntu.org.cn/files/thumbs/t_102_1920_14454.jpg";
$url[] = "http://forum.ubuntu.org.cn/files/thumbs/t_124215196_05e1b29c11_b_41530.jpg";
$width = 150;
$height = 113;
$imgSvc = ImageSvc::instance($width,$height,"./");
foreach($url as $key=>$img)
{/*{{{*/
$imgID = $key+1;
$imgSvc->getThumImgByUrl($img,$imgID);
echo "<img src='./".$imgID."_thum_".$width."_".$height.".jpg'>";
}/*}}}*/
?>
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