《CMS案例:phpcms thumb函數(shù)生成等比縮略圖時(shí)變形的解決方法》要點(diǎn)：
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相關(guān)主題：PHPCMS教程

phpcms thumb函數(shù)生成縮略圖時(shí),如果生成的比例一樣如1000*500的圖生成100*50的圖時(shí)會(huì)變形的解決方案：

如模板代碼為：
<img src="{thumb($r[url],150,120,0)}" alt="{$r[alt]}" title="{$r[alt]}"/>


圖片為960*768時(shí),生成150*120時(shí)就會(huì)變形(這是我實(shí)際開發(fā)過程中用到的代碼)


找到phpcms/libs/images.class.php中找到getpercent函數(shù)(大數(shù)在49行),把此函數(shù)中的
$h = $dstw;
$w = $dsth;


改為
$h = $dsth;
$w = $dstw;


下面是改過后的整個(gè)函數(shù),看代碼注釋

??? function getpercent($srcwidth,$srcheight,$dstw,$dsth) {
??????????? if (empty($srcwidth) || empty($srcheight) || ($srcwidth <= $dstW && $srcheight <= $dstH)) $w = $srcwidth ;$h = $srcheight;
??????????? if ((empty($dstw) || $dstw == 0)? && $dsth > 0 && $srcheight > $dsth) {
??????????????????????? $h = $dsth;
??????????????????????? $w = round($dsth / $srcheight * $srcwidth);
??????????????? } elseif ((empty($dsth) || $dsth == 0) && $dstw > 0 && $srcwidth > $dstw) {
??????????????????????? $w = $dstw;
??????????????????????? $h = round($dstw / $srcwidth * $srcheight);
??????????????? } elseif ($dstw > 0 && $dsth > 0) {
??????????????????????? if (($srcwidth / $dstw) < ($srcheight / $dsth)) {
??????????????????????????????????????? $w = round($dsth / $srcheight * $srcwidth);
??????????????????????????????????????? $h = $dsth;
??????????????????????? } elseif (($srcwidth / $dstw) > ($srcheight / $dsth)) {
??????????????????????????????????????? $w = $dstw;
??????????????????????????????????????? $h = round($dstw / $srcwidth * $srcheight );
??????????????????????? } else {
??????????????????????????? //第一步：把以下兩行代碼注釋掉
??????????????????????????????? //$h = $dstw;
??????????????????????????????? //$w = $dsth;
???????????????????????????????
??????????????????????????????? //第二步：改為以下兩行代碼
??????????????????????????????? $h = $dsth;
??????????????????????????????? $w = $dstw;
???????????????????????????????
???????????????????????????????
??????????????????????? }
??????????????? }
??????????????? $array['w']? = $w;
??????????????? $array['h']? = $h;
??????????????? return $array;
??? }

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