我是这样想....
我设置要生成的缩略图片大小为100*50我的原图片是1000*600我想把原图片等比缩放,水平或垂直居中.其它的地方用白色填充,不知道我的意思表达清了没
我设置要生成的缩略图片大小为100*50我的原图片是1000*600我想把原图片等比缩放,水平或垂直居中.其它的地方用白色填充,不知道我的意思表达清了没
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新图 w2 h2if w1/h1 > w2/h2 //缩放后高度不足
新图高 h = h2/w2*w1
垂直居中时的偏移y = (h2-h)/2
x = 0
if w1/h1 < w2/h2 //缩放后宽度不足
新图宽 w = w2/h2*h1
水平居中时的偏移x = (x2-x)/2
y = 0
/**
* 图像处理类
*/
class image
{
var $attachinfo;
var $targetfile; //图片路径
var $imagecreatefromfunc;
var $imagefunc;
var $attach;
var $animatedgif;
var $waterquality;
var $watertext;
var $thumbstatus;
var $waterstatus;
// 析构函数,兼容PHP4
function image($targetfile, $cfg_thumb, $cfg_watertext, $photo_waterpos, $photo_diaphaneity, $photo_wheight, $photo_wwidth, $cfg_watertype, $photo_trans,$trueMarkimg, $attach = array())
{
$this->__construct($targetfile, $cfg_thumb, $cfg_watertext, $photo_waterpos, $photo_diaphaneity, $photo_wheight, $photo_wwidth, $cfg_watertype, $photo_trans,$trueMarkimg, $attach);
} // 析构函数
function __construct($targetfile, $cfg_thumb, $cfg_watertext, $photo_waterpos, $photo_diaphaneity, $photo_wheight, $photo_wwidth, $cfg_watertype, $photo_trans,$trueMarkimg, $attach = array())
{
$this->thumbstatus = $cfg_thumb;
$this->watertext = $cfg_watertext;
$this->waterstatus = $photo_waterpos;
$this->waterquality = $photo_trans;
$this->waterminwidth = $photo_wwidth;
$this->waterminheight = $photo_wheight;
$this->watertype = $cfg_watertype;
$this->watertrans = $photo_diaphaneity;
$this->animatedgif = 0;
$this->targetfile = $targetfile;
$this->attachinfo = @getimagesize($targetfile);
$this->attach = $attach;
switch($this->attachinfo['mime'])
{
case 'image/jpeg':
$this->imagecreatefromfunc = function_exists('imagecreatefromjpeg') ? 'imagecreatefromjpeg' : '';
$this->imagefunc = function_exists('imagejpeg') ? 'imagejpeg' : '';
break;
case 'image/gif':
$this->imagecreatefromfunc = function_exists('imagecreatefromgif') ? 'imagecreatefromgif' : '';
$this->imagefunc = function_exists('imagegif') ? 'imagegif' : '';
break;
case 'image/png':
$this->imagecreatefromfunc = function_exists('imagecreatefrompng') ? 'imagecreatefrompng' : '';
$this->imagefunc = function_exists('imagepng') ? 'imagepng' : '';
break;
}//为空则匹配类型的函数不存在 $this->attach['size'] = empty($this->attach['size']) ? @filesize($targetfile) : $this->attach['size'];
if($this->attachinfo['mime'] == 'image/gif')
{
$fp = fopen($targetfile, 'rb');
$targetfilecontent = fread($fp, $this->attach['size']);
fclose($fp);
$this->animatedgif = strpos($targetfilecontent, 'NETSCAPE2.0') === false ? 0 : 1;
}
} /**
* 生成缩略图
*
* @access public
* @param int $thumbwidth 图片宽度
* @param int $thumbheight 图片高度
* @param int $preview 是否预览
* @return void
*/
function thumb($thumbwidth, $thumbheight, $preview = 0)
{
$this->thumb_gd($thumbwidth, $thumbheight, $preview); if($this->thumbstatus == 2 && $this->waterstatus)
{
$this->image($this->targetfile, $this->attach);
$this->attach['size'] = filesize($this->targetfile);
}
} /**
* 使用gd生成缩略图
*
* @access public
* @param int $thumbwidth 图片宽度
* @param int $thumbheight 图片高度
* @param int $preview 是否预览
* @return void
*/
function thumb_gd($thumbwidth, $thumbheight, $preview = 0)
{ if($this->thumbstatus && function_exists('imagecreatetruecolor') && function_exists('imagecopyresampled') && function_exists('imagejpeg'))
{
$imagecreatefromfunc = $this->imagecreatefromfunc;
$imagefunc = $this->thumbstatus == 1 ? 'imagejpeg' : $this->imagefunc;
list($imagewidth, $imageheight) = $this->attachinfo;
if(!$this->animatedgif && ($imagewidth >= $thumbwidth || $imageheight >= $thumbheight))
{
$attach_photo = $imagecreatefromfunc($this->targetfile);
$x_ratio = $thumbwidth / $imagewidth;
$y_ratio = $thumbheight / $imageheight;
if(($x_ratio * $imageheight) < $thumbheight)
{
$thumb['height'] = ceil($x_ratio * $imageheight);
$thumb['width'] = $thumbwidth;
}
else
{
$thumb['width'] = ceil($y_ratio * $imagewidth);
$thumb['height'] = $thumbheight;
}
$targetfile = !$preview ? ($this->thumbstatus == 1 ? $this->targetfile.'.thumb.jpg' : $this->targetfile) : './water_tmp.jpg';
$thumb_photo = imagecreatetruecolor($thumb['width'], $thumb['height']);
imagecopyresampled($thumb_photo, $attach_photo, 0, 0, 0, 0, $thumb['width'], $thumb['height'], $imagewidth, $imageheight);
if($this->attachinfo['mime'] == 'image/jpeg')
{
$imagefunc($thumb_photo, $targetfile, 100);
}
else
{
$imagefunc($thumb_photo, $targetfile);
}
$this->attach['thumb'] = $this->thumbstatus == 1 ? 1 : 0;
}
}
}
}//End Class