phpcms v9 缩略图特色图居中剪切

2014-11-23 15:33:35 boxcms PHPCMS开发原创收藏

phpcms v9默认的缩略图不是居左剪切，phpcms缩略图居中剪切会保证图片的质量以及网站整体的美观。

修改文件phpcms/libs/classes/image.class.php的thumb()方法，添加了一个参数$per来控制剪切的部位。

function thumb($image, $filename = '', $maxwidth = 200, $maxheight = 200, $suffix='', $autocut = 0, $ftp = 0 ,$per = 0) {

if(!$this->thumb_enable || !$this->check($image)) return false;

$info = image::info($image);

if($info === false) return false;

$srcwidth = $info['width'];

$srcheight = $info['height'];

$pathinfo = pathinfo($image);

$type = $pathinfo['extension'];

if(!$type) $type = $info['type'];

$type = strtolower($type);

unset($info);

if(!$maxheight)$maxheight = $maxwidth*$srcheight/srcwidth;

$creat_arr = $this->getpercent($srcwidth,$srcheight,$maxwidth,$maxheight);

$createwidth = $width = $creat_arr['w'];

$createheight = $height = $creat_arr['h'];

$psrc_x = $psrc_y = 0;

if($autocut && $maxwidth > 0 && $maxheight > 0) {

if($maxwidth/$maxheight<$srcwidth/$srcheight && $maxheight>=$height) {

$width = $maxheight/$height*$width;

$height = $maxheight;

if($per)$psrc_x = ($width - $maxwidth)*$srcheight/$height*$per/2; //$per=0剪切开头，1中间，2结尾

}elseif($maxwidth/$maxheight>$srcwidth/$srcheight && $maxwidth>=$width) {

$height = $maxwidth/$width*$height;

$width = $maxwidth;

if($per)$psrc_y = ($height - $maxheight)*$srcwidth/$width*$per/2;

}

$createwidth = $maxwidth;

$createheight = $maxheight;

}

$createfun = 'imagecreatefrom'.($type=='jpg' ? 'jpeg' : $type);

$srcimg = $createfun($image);

if($type != 'gif' && function_exists('imagecreatetruecolor'))

$thumbimg = imagecreatetruecolor($createwidth, $createheight);

else

$thumbimg = imagecreate($createwidth, $createheight); //原参数($width, $height)即使设置剪切图片、gif图片仍然不剪切

if(function_exists('imagecopyresampled'))

imagecopyresampled($thumbimg, $srcimg, 0, 0, $psrc_x, $psrc_y, $width, $height, $srcwidth, $srcheight);

else

imagecopyresized($thumbimg, $srcimg, 0, 0, $psrc_x, $psrc_y, $width, $height, $srcwidth, $srcheight);

if($type=='gif' || $type=='png') {

$background_color = imagecolorallocate($thumbimg, 0, 255, 0); // 指派一个绿色

imagecolortransparent($thumbimg, $background_color); // 设置为透明色，若注释掉该行则输出绿色的图

}

if($type=='jpg' || $type=='jpeg') imageinterlace($thumbimg, $this->interlace);

$imagefun = 'image'.($type=='jpg' ? 'jpeg' : $type);

if(empty($filename)) $filename = substr($image, 0, strrpos($image, '.')).$suffix.'.'.$type;

$imagefun($thumbimg, $filename);

$this->watermark($filename); //缩微图加水印

imagedestroy($thumbimg);

imagedestroy($srcimg);

if($ftp) {

@unlink($image);

}

return $filename;

}

说明：方法添加了一个参数$per，来控制剪切的部位，如果$per=0剪切开头，1中间，2结尾，如果是宽图片那么0从左边剪切，1剪切中间，2从右边剪切。如果是长条图片，0从上开始剪切，1从中间，2从下边。设置$per参数时，$autocut参数（是否对图片剪切，原有参数）必须设置为1.

如果你搞不懂在哪修改的请下载 image.class.php

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