PHP调整大小并裁剪居中的顶部图像

Question

I'm trying to resize (keeping the aspect ratio) and crop the excess of image (outside the thumbnail limits), but doing that while crop x = center and y = top.

I'm missing something here, but my final image fits inside the thumbnail area, and not fill it and crop the excess. Hope someone can help me on this.

This is my code, so far:

$image_width = 725; // not static, just an example
$image_height = 409; // not static, just an example

// image can be wide or portrait

$width = 140;
$height = 160;

$thumbnail = imagecreatetruecolor($width, $height); 
$white = imagecolorallocate($thumbnail, 255, 255, 255);
imagefill($thumbnail, 0, 0, $white);        

$width_ratio = $image_width/$width;
$height_ratio = $image_height/$height;

if ($width_ratio>$height_ratio) {
    $dest_width=$width;
    $dest_height=$image_height/$width_ratio;        
}
else{       
    $dest_width=$image_width/$height_ratio;
    $dest_height=$height;           
}   

$int_width = ($width - $dest_width)/2;
$int_height = ($height - $dest_height)/2;        

imagecopyresampled($thumbnail, $original_image, $int_width, $int_height, 0, 0, $dest_width, $dest_height, $image_width, $image_height);  

Thanks!

Answer 1

Your $image_width , $image_height , $width and $height are static, which means $width_ratio and $height_ratio are always they same aswell (respectively: 5.1785714285714 and 2.55625 , so width ratio is always higher then height ratio).

In this case, this block of your code:

if ($width_ratio>$height_ratio) {
    $dest_width=$width;
    $dest_height=$image_height/$width_ratio;        
}
else{       
    $dest_width=$image_width/$height_ratio;
    $dest_height=$height;           
}

will always run if and never run else - remove it and leave just:

$dest_width=$image_width/$height_ratio;
$dest_height=$height; 

and your image will be cropped based on higher value - in this case height will be resized accordingly to new height and excess of width will be cut off.

Hope this is what you were looking for!

EDIT:

Right now script if cutting off edges equally. If you want them to be cut fully from top or left (depends on ratio), then:

Remove that part of code totally:

$int_width = ($width - $dest_width)/2;
$int_height = ($height - $dest_height)/2;

Change your if else condition mentioned before to:

if($width_ratio < $height_ratio) {
    $dest_width=$width;
    $dest_height=$image_height/$width_ratio;

    $int_width = ($width - $dest_width)/2;
    $int_height = 0;
} else {       
    $dest_width=$image_width/$height_ratio;
    $dest_height=$height;

    $int_width = 0;
    $int_height = ($height - $dest_height)/2;
}

EDIT 2

Horizontal always cut off equally, vertical always from the top - as you wanted:

if($width_ratio < $height_ratio) {
    $dest_width=$width;
    $dest_height=$image_height/$width_ratio;
} else {       
    $dest_width=$image_width/$height_ratio;
    $dest_height=$height;
}

$int_width = ($width - $dest_width)/2;
$int_height = 0;