dedecms 5.6 缩略图按大小比例缩小裁剪
<p><span style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'>这样的话,如果<u>图片</u>的宽高比例不合适,那么缩略图将会被压缩得很不好看,在这里,我是先对图片进行按宽或高进行放缩,超过缩略图大小的部分再进行裁剪,这样生成的缩略图的显示效果要比原来的要好得多了。 </span><br style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'><br style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'><span style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'>于是重新修改了一下DEDECMS v5.6缩略图生成方法。 </span><br style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'><br style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'><span style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'>默认dedecms5.6默认生成的缩略图,缩略图大小设置为:100*100(直接把图片缩小了) </span><br style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'><br style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'><span style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'>看起来很不美观,影响了图片的观赏性 </span><br style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'><br style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'><br style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'><span style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'>DEDECMS v5.6缩略图裁剪优化方法 </span><br style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'><br style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'><span style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'>修改如下: </span><br style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'><span style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'>打开/includes/image.func.php文件, </span><br style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'><span style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'>//缩图片自动生成函数,来源支持bmp、gif、jpg、png </span><br style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'><span style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'>//但生成的小图只用jpg或png格式 </span><br style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'><span style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'>找到代码第44行function ImageResize </span><br style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'><span style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'>至 </span><br style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'><span style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'>//获得GD的版本之间的代码 </span><br style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'><span style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'>,用如下的代码覆盖(大家请注意备份)。 </span></p>
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<p class="right">
<span><u>复制代码</u></span></p>
<p>
代码如下:</p>
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function ImageResize($srcFile,$toW,$toH,$toFile="") <br>
{ <br>
global $cfg_photo_type; <br>
if($toFile=="") <br>
{ <br>
$toFile = $srcFile; <br>
} <br>
$info = ""; <br>
$srcInfo = GetImageSize($srcFile,$info); <br>
switch ($srcInfo) <br>
{ <br>
case 1: <br>
if(!$cfg_photo_type['gif']) <br>
{ <br>
return false; <br>
} <br>
$im = imagecreatefromgif($srcFile); <br>
break; <br>
case 2: <br>
if(!$cfg_photo_type['jpeg']) <br>
{ <br>
return false; <br>
} <br>
$im = imagecreatefromjpeg($srcFile); <br>
break; <br>
case 3: <br>
if(!$cfg_photo_type['png']) <br>
{ <br>
return false; <br>
} <br>
$im = imagecreatefrompng($srcFile); <br>
break; <br>
case 6: <br>
if(!$cfg_photo_type['bmp']) <br>
{ <br>
return false; <br>
} <br>
$im = imagecreatefromwbmp($srcFile); <br>
break; <br>
} <br>
$srcW=ImageSX($im); <br>
$srcH=ImageSY($im); <br>
if($srcW<=$toW && $srcH<=$toH ) <br>
{ <br>
return true; <br>
} <br>
//缩略生成并裁剪 <br>
$newW = $toH * $srcW / $srcH; <br>
$newH = $toW * $srcH / $srcW; <br>
if($newH >= $toH) <br>
{ <br>
$ftoW = $toW; <br>
$ftoH = $newH; <br>
} <br>
else <br>
{ <br>
$ftoW = $newW; <br>
$ftoH = $toH; <br>
} <br>
if($srcW>$toW||$srcH>$toH) <br>
{ <br>
if(function_exists("imagecreatetruecolor")) <br>
{ <br>
@$ni = imagecreatetruecolor($ftoW,$ftoH); <br>
if($ni) <br>
{ <br>
imagecopyresampled($ni,$im,0,0,0,0,$ftoW,$ftoH,$srcW,$srcH); <br>
} <br>
else <br>
{ <br>
$ni=imagecreate($ftoW,$ftoH); <br>
imagecopyresized($ni,$im,0,0,0,0,$ftoW,$ftoH,$srcW,$srcH); <br>
} <br>
} <br>
else <br>
{ <br>
$ni=imagecreate($ftoW,$ftoH); <br>
imagecopyresized($ni,$im,0,0,0,0,$ftoW,$ftoH,$srcW,$srcH); <br>
} <br>
//裁剪图片成标准缩略图 <br><br>
$new_imgx = imagecreatetruecolor($toW,$toH); <br>
if($newH >= $toH) <br>
{ <br>
imagecopyresampled($new_imgx,$ni,0,0,0,($newH - $toH)/2,$toW,$toH,$toW,$toH); <br>
} <br>
else <br>
{ <br>
imagecopyresampled($new_imgx,$ni,0,0,($newW - $toW)/2,0,$toW,$toH,$toW,$toH); <br>
} <br>
switch ($srcInfo) <br>
{ <br>
case 1: <br>
imagegif($new_imgx,$toFile); <br>
break; <br>
case 2: <br>
imagejpeg($new_imgx,$toFile,85); <br>
break; <br>
case 3: <br>
imagepng($new_imgx,$toFile); <br>
break; <br>
case 6: <br>
imagebmp($new_imgx,$toFile); <br>
break; <br>
default: <br>
return false; <br>
} <br>
imagedestroy($new_imgx); <br>
imagedestroy($ni); <br>
} <br>
imagedestroy($im); <br>
return true; <br>
} </p>
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