php - 调整大小然后裁剪 PHP

Question

好的，基本上我希望所有图像都是 170x170 像素的正方形。因此，如果图像不是正方形，我希望调整它的大小，然后在中间裁剪..

我花了很多时间玩这个但我一无所获..我已经让它裁剪了较大图像的一部分等，但我特别需要调整图像大小，然后裁剪..

如有任何帮助，我们将不胜感激。

// get image size of img
$x = @getimagesize($img);
// image width
$sw = $x[0];
// image height
$sh = $x[1];

if($sw > $sh) // Horizontal Rectangle?
{
  $newwidth = ($sw/$sh)*170;
  $newheight=170;   
  $x_pos = ($sw - $sh) / 2;
  $x_pos = ceil($x_pos);
  $y_pos=0;
}

else if($sh > $sw) // Vertical Rectangle?
{
  $newheight = ($sh/$sw)*170;
  $newwidth=170;
  $y_pos = ($sh - $sw) / 2;
  $y_pos = ceil($y_pos);
  $x_pos=0;
}
else //Already Square
{
  $newheight=170;
  $newwidth=170;
}

$im = @ImageCreateFromJPEG ($img) or // Read JPEG Image
$im = @ImageCreateFromPNG ($img) or // or PNG Image
$im = @ImageCreateFromGIF ($img) or // or GIF Image
$im = false; // If image is not JPEG, PNG, or GIF

if (!$im) {
  // We get errors from PHP's ImageCreate functions...
  // So let's echo back the contents of the actual image.
  readfile ($img);
} else {
  // Create the resized image destination
  $thumb = @ImageCreateTrueColor (170, 170);
  // Copy from image source, resize it, and paste to image destination
  imagecopyresampled($thumb, $im, 0, 0, 180, $y_pos, 170, 170, $newwidth, 
    $newheight);
}

Answer 1

好的，这是一个可以工作的；

<?
$img = 'leaf.jpg';
// get image size of img
$x = @getimagesize($img);

// image dimensions
$sw = $x[0];
$sh = $x[1];

//dest size
$dSize = 170;

//find smallerst part and get needed scale and offset
$yOff = 0;
$xOff = 0;
if($sw < $sh) {
  $scale = $dSize / $sw;
  $yOff = $sh/2 - $dSize/$scale/2; 
} else {
  $scale = $dSize / $sh;
  $xOff = $sw/2 - $dSize/$scale/2; 
}

$im = @ImageCreateFromJPEG ($img) or // Read JPEG Image
$im = @ImageCreateFromPNG ($img) or // or PNG Image
$im = @ImageCreateFromGIF ($img) or // or GIF Image
$im = false; // If image is not JPEG, PNG, or GIF

if (!$im) {
  // We get errors from PHP's ImageCreate functions...
  // So let's echo back the contents of the actual image.
  readfile ($img);
} else {
  // Create the resized image destination
  $thumb = @ImageCreateTrueColor ($dSize,$dSize);
  // Copy from image source, resize it, and paste to image destination
  imagecopyresampled($thumb, $im, 
    0, 0, 
    $xOff,$yOff,
    $dSize, $dSize, 
    $dSize / $scale ,$dSize / $scale);
}
header('content-type:image/jpeg');
imagejpeg($thumb);
//imagejpeg($im);