牛奶雪顶茶 發表於 2023-6-23 00:00:00

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>
<div class="msgheader" style='margin: 3px auto 0px; padding: 0px 3px; outline: none; line-height: 21.6px; clear: both; border-width: 1px; border-style: solid; border-color: rgb(0, 153, 204); background: rgb(246, 251, 255); overflow: hidden; font-family: tahoma, arial, "Microsoft YaHei";'>
        <p class="right">
                <span><u>复制代码</u></span></p>
        <p>
                代码如下:</p>
</div>
<p class="msgborder" style='margin: 0px auto 3px; padding: 0px 3px; outline: none; line-height: 25.2px; font-size: 14px; clear: both; border-right: 1px solid rgb(0, 153, 204); background: rgb(221, 237, 251); overflow: hidden; border-left: 1px solid rgb(0, 153, 204); word-break: break-all; border-bottom: 1px solid rgb(0, 153, 204); word-wrap: break-word; font-family: tahoma, arial, "Microsoft YaHei";'>
        <br>
        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($srcW&lt;=$toW &amp;&amp; $srcH&lt;=$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 &gt;= $toH) <br>
        { <br>
        $ftoW = $toW; <br>
        $ftoH = $newH; <br>
        } <br>
        else <br>
        { <br>
        $ftoW = $newW; <br>
        $ftoH = $toH; <br>
        } <br>
        if($srcW&gt;$toW||$srcH&gt;$toH) <br>
        { <br>
        if(function_exists("imagecreatetruecolor")) <br>
        { <br>
        @$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 &gt;= $toH) <br>
        { <br>
        imagecopyresampled($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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