Question

Spending time reading through the docs, and searching for examples. I understand cropping an image from top 0, and left 0 is pretty straight forward. However. I would like to pass 2 sets of coordinates, a starting point and an ending point. Four Points, a Square that is defined anywhere. However from the examples I am finding, and from what I gather the rendition is not going to let me do this. codeigniter so I am seeking confirmation on this thought, is it true that I can only provide end points from 0, and it crops a square based on said end points or can I actually specify an x start, an x end, and similar for y?

Or is there some other technique I can use within codeigniter that will allow me to pass for coordinates for starting and ending points?

Answer 1

You can use for example of class of defined cropping image and call it a class via library or helper in a codeigniter:

For example call it:

LibraryCropImage::ResizedThumbnail($profile_thumbsize_x, $profile_thumbsize_x, $path, $filename, $path_to, $filename_to.'_sized', $quality, $fileextension);
LibraryCropImage::CroppedThumbnail($profile_thumbsize_x, $profile_thumbsize_x, $path, $filename, $path_to, $filename_to.'_cropped', $quality, $fileextension);

abstract class LibraryCropImage  {

    function ResizedThumbnail($thumbnail_width, $thumbnail_height, $path, $filename, $path_to, $filename_to, $quality, $ext)
    {
    list($width, $height) = getimagesize($path.$filename);

    $new_width = $thumbnail_width;
    $new_height = $thumbnail_height;

    if ($ext == "jpg" || $ext == "jpeg")
    {
        $thumb = @imagecreatefromjpeg($path.$filename);
    }
    else if ($ext == "gif")
    {
        $thumb = @imagecreatefromgif($path.$filename);
    }
    else if ($ext == "png")
    {
        $thumb = @imagecreatefrompng($path.$filename);
    }
    $thumbp = imagecreatetruecolor($new_width, $new_height);



    imagecopyresampled($thumbp, $thumb, 0, 0, 0, 0, $new_width, $new_height, $width, $height);

    ob_start();
    if ($ext == "jpg" || $ext == "jpeg")
    {
        imagejpeg($thumbp, null, $quality);
    }
    else if ($ext == "gif")
    {
        imagegif($thumbp);
    }
    else if ($ext == "png")
    {
        imagepng($thumbp, null);
    }
    $i = ob_get_clean();
    $fp = fopen($path_to.$filename_to.'.'.$ext, 'w');
    fwrite ($fp, $i);
    fclose ($fp);
    imagedestroy($thumbp);
    }

    function CroppedThumbnail($thumbnail_width, $thumbnail_height, $path, $filename, $path_to, $filename_to, $quality, $ext)
    {
    list($width, $height) = getimagesize($path.$filename);

    $new_width = $thumbnail_width;
    $new_height = $thumbnail_height;

    if ($ext == "jpg" || $ext == "jpeg")
    {
        $image = @imagecreatefromjpeg($path.$filename);
    }
    else if ($ext == "gif")
    {
        $image = @imagecreatefromgif($path.$filename);
    }
    else if ($ext == "png")
    {
        $image = @imagecreatefrompng($path.$filename);
    }

    $filename = $path.$filename;

    $thumb_width = $thumbnail_width;
    $thumb_height = $thumbnail_height;

    $width = imagesx($image);
    $height = imagesy($image);

    $original_aspect = $width / $height;
    $thumb_aspect = $thumb_width / $thumb_height;

    if($original_aspect >= $thumb_aspect) {
       // If image is wider than thumbnail (in aspect ratio sense)
       $new_height = $thumb_height;
       $new_width = $width / ($height / $thumb_height);
    } else {
       // If the thumbnail is wider than the image
       $new_width = $thumb_width;
       $new_height = $height / ($width / $thumb_width);
    }

    $thumb = imagecreatetruecolor($thumb_width, $thumb_height);

    // Resize and crop 
    imagecopyresampled($thumb,
                       $image,
                       0 - ($new_width - $thumb_width) / 2, // Center the image horizontally
                       0 - ($new_height - $thumb_height) / 2, // Center the image vertically
                       0, 0,
                       $new_width, $new_height,
                       $width, $height);


    ob_start();
    if ($ext == "jpg" || $ext == "jpeg")
    {
        imagejpeg($thumb, null, $quality);
    }
    else if ($ext == "gif")
    {
        imagegif($thumb);
    }
    else if ($ext == "png")
    {
        imagepng($thumb, null);
    }
    $i = ob_get_clean();
    $fp = fopen($path_to.$filename_to.'.'.$ext, 'w');
    fwrite ($fp, $i);
    fclose ($fp);
    imagedestroy($thumb);
    }
}