需要居中縮放的縮略圖

我有以下用於從用戶上傳中生成縮略圖的代碼。它使縮略圖，保持寬高比和增加白色背景。但它將其與左上方對齊。我需要居中對齊，水平和垂直。需要居中縮放的縮略圖

function makethumbnail($thumbw,$thumbh,$thumbName,$sourceName){ 

$ext=getExtension($sourceName); 
//echo $ext; 
$sourcePath = 'images/logos/deals/'; // Path of original image 
$sourceUrl = 'http://www.malldeals.com/admin/convert/'; 
$thumbPath = $sourcePath; // Writeable thumb path 
$thumbUrl = $sourceUrl . $thumbPath ; 
$thumbHeight=0; 
$thumbWidth=0; 
// Beyond this point is simply code. 
if(!strcmp("png",$ext)) 
    $sourceImage = imagecreatefrompng("$sourcePath/$sourceName"); 
else if(!strcmp("jpg",$ext) || !strcmp("jpeg",$ext)) 
    $sourceImage = imagecreatefromjpeg("$sourcePath/$sourceName"); 
else if(!strcmp("gif",$ext)) 
    $sourceImage = imagecreatefromgif("$sourcePath/$sourceName"); 
      global $sourceWidth, $sourceHeight; 
      $sourceWidth = imagesx($sourceImage); 
      $sourceHeight = imagesy($sourceImage); 

$ratio1=$sourceWidth/$thumbw; 
$ratio2=$sourceHeight/$thumbh; 
if($ratio1>$ratio2) { 
    $thumbWidth=$thumbw; 
    $thumbHeight=$sourceHeight/$ratio1; 
} 
else { 
    $thumbHeight=$thumbh; 
    $thumbWidth=$sourceWidth/$ratio2; 
} 


$targetImage = imagecreatetruecolor($thumbw,$thumbh); 

    // get the color white 
    $color = imagecolorallocate($targetImage, 255, 255, 255); 

    // fill entire image 
    imagefill($targetImage, 0, 0, $color); 
imagecopyresampled($targetImage,$sourceImage,0,0,0,0,$thumbWidth,$thumbHeight,imagesx($sourceImage),imagesy($sourceImage));

來源

2011-11-22 Jean-Pierre Bazinet

像這樣的東西可能會奏效，以取代上述

$offsetx = round((imagesx($sourceImage) - $thumbw)/2); 
$offsety = round((imagesy($sourceImage) - $thumbh)/2); 

imagecopyresampled($targetImage,$sourceImage,$offsetx,$offsety, 
0,0,$thumbWidth,$thumbHeight,imagesx($sourceImage),imagesy($sourceImage));

來源

2011-11-22 01:27:46

這似乎並不奏效。請注意，我創建了兩個縮略圖，一個是180x60，另一個是50x50。上面的代碼產生的結果是： original：（http://malldeals.com/admin/images/logos/1321988719ymca-ywca.jpg） thumbnail1：（http://malldeals.com/admin/images/logos /big1321988719ymca-ywca.jpg） thumbnail2：（http://malldeals.com/admin/images/logos/small1321988719ymca-ywca.jpg） –

我的PHP GD圖像編輯做了一個函數的代碼的最後一行
PHP-GD-Imagestyle
您可以使用自動調整大小創造中心的縮略圖樣式。

$thumb = imagestyle($image,'autosize:250 250');

來源

2014-09-09 11:28:04

需要居中縮放的縮略圖

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