Question

I’m trying to create thumbnail and resize image at the same time, so to be more clear here is the image that i’m trying to crop:

And i would like to cut out that red area.

Now my problem is that i’m resizing my image with html before croping so when i submit data to php i get incorrect values, like y = 100 when realy it could be y = 200 so i need to find a way to calculate my values.

I am using imagecopyresampled, maybe there is something better then this command?

Also my closest soliution was this:

imagecopyresampled(
    $thumb, //Destination image link resource.
    $src,   //Source image link resource.
    0,      //x-coordinate of destination point.
    0,      //y-coordinate of destination point.
    0,      //x-coordinate of source point.
    0,      //y-coordinate of source point.
    120,    //Destination width.
    160,    //Destination height.
    $image_width/2, //Source width.
    $image_height/2  //Source height.
);

In this case it would cut out left corner but size would be not the same as my red box.
So i guess i need to get source width and source height right and everything else should fit perfectly, anyways i hope i make any sense here 🙂

EDIT Sorry i forgot to mention, $image_width and $image_height is the original image size

EDIT 2 To be more clear this is what i get when i resize with this code

$dimensions = getimagesize('testas.jpg');

$img = imagecreatetruecolor(120, 160); 
$src = imagecreatefromjpeg('testas.jpg');

imagecopyresampled($img, $src, 0, 0, 0, 0, 120, 160, $dimensions[0]/2, $dimensions[1]/2); 

imagejpeg($img, 'test.jpg');

Resized image size is correct, but as you can it doesn’t look right.

Answer 1

I use something like this to scale images:

public static function scaleProportional($img_w,$img_h,$max=50)
{
    $w = 0;
    $h = 0;

    $img_w > $img_h ? $w = $img_w / $img_h : $w = 1;
    $img_h > $img_w ? $h = $img_h / $img_w : $h = 1;

    $ws = $w > $h ? $ws = ($w / $w) * $max : $ws = (1 / $h) * $max;
    $hs = $h > $w ? $hs = ($h / $h) * $max : $hs = (1 / $w) * $max;

    return array(
        'width'=>$ws,
        'height'=>$hs
    );
}

usage:

            $getScale = Common::scaleProportional($prevWidth,$prevHeight,$scaleArray[$i][1]);
            $targ_w = $getScale['width'];
            $targ_h = $getScale['height'];
            $jpeg_quality = 100;

            $src = $prevdest;

            $img_r = imagecreatefromjpeg($src);
            $dst_r = ImageCreateTrueColor( $targ_w, $targ_h );
            //imagecopyresampled(dest_img,src_img,dst_x,dst_y,src_x,src_y,dst_w,dst_h,src_w,src_h);
            imagecopyresampled($dst_r,$img_r,0,0,0,0,$targ_w,$targ_h,$prevWidth,$prevHeight);
            imagejpeg($dst_r, 'assets/images/'.$scaleArray[$i][0].'/'.$filename, $jpeg_quality);
            $complete[] = $scaleArray[$i][0];