how to compute Facebook graph api cover offset_y to pixel?

Question

I can retrieve facebook cover source and offset_y from graph api for example -

https://graph.facebook.com/Inna

I get this -

\"cover\": {
           


        

Answer 1

some solution on php i'm using PhpThumb_Factory:

        private $_cropX = 850;
        private $_cropY = 315;
        private $_origignalHeight;
        private $_origignalWidth;

 $scale = $this->caclScale($cover->cover->source);
        $thumb = \PhpThumb_Factory::create($imagePath);

                            $real_img_y = ($this->_cropX * $this->_origignalHeight / $this->_origignalWidth) - $this->_cropY;

                            $real_img_x = ($this->_cropY * $this->_origignalWidth / $this->_origignalHeight) - $this->_cropX;

                            $offset = $this->_authSession->offset;


                            $offset_x=($real_img_x * $offset['x'] / 100);



                            $offset_y=($real_img_y * $offset['y'] / 100);

                            $thumb->crop($offset_x, $offset_y, $this->_cropX, $this->_cropY);

                            $thumb->save($imagePath);


    private function caclScale($url) {
            $originalFileSizeParams = @exif_read_data($url);
    //            //$originalFileSize = $originalFileSizeParams['FileSize'];
    //            Zend_Debug::dump($originalFileSizeParams);
    //            die();

            $this->_origignalHeight = $originalFileSizeParams['COMPUTED']['Height'];
            $this->_origignalWidth = $originalFileSizeParams['COMPUTED']['Width'];

            if ($this->_origignalWidth < $this->_cropX) {
                $scale = ($this->_cropX * 100) / $this->_origignalWidth;
            } else {
                $scale = 100;
            }
            return $scale;
        }