使用imagecopy的圖像的作物中心正方形使用imagecopyresampled

Question

我試圖從正常尺寸的圖像創建2個裁剪縮略圖（60x60和150x150）。一切工作都很好，除了種植，這是行不通的。這部分產生縮略圖，一條黑線下來的右側是這樣的：

............. 
.   ... 
.   ... 
.   ... 
............. 

調整大小正常工作，作爲結束縮略圖有60和150把正確的高度（從風景圖像作爲原工作）但他們仍然出現風景。

我有什麼：

list($thumb_width, $thumb_height) = getimagesize($thumb_target); 
if ($thumb_width > $thumb_height) { // landscape 
    $thumb1_new_height = 60; 
    $thumb1_new_width = floor($thumb_width * ($thumb1_new_height/$thumb_height)); 
    $thumb1_crop_x = ceil(($thumb_width - $thumb_height)/2); 
    $thumb1_crop_y = 0; 
    $thumb2_new_height = 150; 
    $thumb2_new_width = floor($thumb_width * ($thumb2_new_height/$thumb_height)); 
    $thumb2_crop_x = ceil(($thumb_width - $thumb_height)/2); 
    $thumb2_crop_y = 0; 
} 
else if ($thumb_width < $thumb_height){ // portrait 
    $thumb1_new_width = 60; 
    $thumb1_new_height = floor($thumb_height * ($thumb1_new_width/$thumb_width)); 
    $thumb1_crop_x = 0; 
    $thumb1_crop_y = ceil(($thumb_height - $thumb_width)/2); 
    $thumb2_new_width = 150; 
    $thumb2_new_height = floor($thumb_height * ($thumb2_new_width/$thumb_width)); 
    $thumb2_crop_x = 0; 
    $thumb2_crop_y = ceil(($thumb_height - $thumb_width)/2); 
} else { // square 
    $thumb1_new_width = 60; 
    $thumb1_new_height = 60; 
    $thumb1_crop_x = 0; 
    $thumb1_crop_y = 0; 
    $thumb2_new_width = 150; 
    $thumb2_new_height = 150; 
    $thumb2_crop_x = 0; 
    $thumb2_crop_y = 0; 
} 
$thumb1_tmp_img = imagecreatetruecolor($thumb1_new_width,$thumb1_new_height); 
$thumb2_tmp_img = imagecreatetruecolor($thumb2_new_width,$thumb2_new_height); 
imagecopyresampled($thumb1_tmp_img, $thumb_img, 0, 0, $thumb1_crop_x, $thumb1_crop_y, $thumb1_new_width, $thumb1_new_height, $thumb_width, $thumb_height); 
imagecopyresampled($thumb2_tmp_img, $thumb_img, 0, 0, $thumb2_crop_x, $thumb2_crop_y, $thumb2_new_width, $thumb2_new_height, $thumb_width, $thumb_height); 

Answer 1

我覺得你在thumb1_tmp_img會錯接近尾聲。我做了這個課，所以我不必像你那樣重複，但你可以看到變化。看看這是否適合你：

class ImageFactory 
    { 
     public function MakeThumb($thumb_target = '', $width = 60,$height = 60,$SetFileName = false, $quality = 80) 
      { 
       $thumb_img = imagecreatefromjpeg($thumb_target); 

       // size from 
       list($w, $h) = getimagesize($thumb_target); 

       if($w > $h) { 
         $new_height = $height; 
         $new_width = floor($w * ($new_height/$h)); 
         $crop_x  = ceil(($w - $h)/2); 
         $crop_y  = 0; 
       } 
       else { 
         $new_width = $width; 
         $new_height = floor($h * ($new_width/$w)); 
         $crop_x  = 0; 
         $crop_y  = ceil(($h - $w)/2); 
       } 

       // I think this is where you are mainly going wrong 
       $tmp_img = imagecreatetruecolor($width,$height); 

       imagecopyresampled($tmp_img, $thumb_img, 0, 0, $crop_x, $crop_y, $new_width, $new_height, $w, $h); 

       if($SetFileName == false) { 
         header('Content-Type: image/jpeg'); 
         imagejpeg($tmp_img); 
       } 
       else 
        imagejpeg($tmp_img,$SetFileName,$quality); 

       imagedestroy($tmp_img); 
      } 
    } 

// Initiate class 
$ImageMaker = new ImageFactory(); 

// Here is just a test landscape sized image 
$thumb_target = 'http://media1.santabanta.com/full6/Outdoors/Landscapes/landscapes-246a.jpg'; 

// 60px x 60px 
$ImageMaker->MakeThumb($thumb_target,60,60,'image60px.jpg'); 

// Here is a portrait for testing 
$thumb_target = 'http://imgc.allpostersimages.com/images/P-488-488-90/55/5543/L6HLG00Z/posters/warning-you-are-entering-a-fart-zone.jpg'; 

// 150px x 150px 
$ImageMaker->MakeThumb($thumb_target,150,150,'image150px.jpg');