image - Rails paperclip crop save ratio -


how save ratio while crop image?

i use paperclip , image style blog_article_main 940x400x works ok.

but while crop image ratio changed.

my cropper 

module paperclip   class cropper < thumbnail     def transformation_command       if crop_command         crop_command + super.join(' ').sub(/ -crop \s+/, '').split(' ')        else         super       end     end      def crop_command       target = @attachment.instance if @attachment       if target.cropping?         ["-crop", "#{target.crop_w}x#{target.crop_h}+#{target.crop_x}+#{target.crop_y}"]       end     end   end end

my js 

javascript:   $(function () {     $('#cropbox').jcrop({       onchange: update_crop,       onselect: update_crop,       bgcolor: 'black',       bgopacity: .2,       setselect: [100, 100, 400, 400],       //aspectratio: 16 / 9,       maxsize:[940,400]     });   });   function update_crop(coords) {     var rx = 100/coords.w;     var ry = 100/coords.h;     $('#preview').css({       width: math.round(rx * "#{@photo.photo_geometry(:blog_article_main).width}" ) + 'px',       height: math.round(ry *  "{#@photo.photo_geometry(:blog_article_main).height}" ) + 'px',       marginleft: '-' + math.round(rx * coords.x) + 'px',       margintop: '-' + math.round(ry * coords.y) + 'px'     });     var ratio = "#{@photo.photo_geometry(:original).width}"  /  "#{@photo.photo_geometry(:blog_article_main).width}" ;     $("#crop_x").val(math.round(coords.x * ratio));     $("#crop_y").val(math.round(coords.y * ratio));     $("#crop_w").val(math.round(coords.w * ratio));     $("#crop_h").val(math.round(coords.h * ratio));      }

and after image has cropped ratio changed

 def photo_geometry(style = :original)     @geometry ||= {}     @geometry[style] ||= paperclip::geometry.from_file(self.image(style))   end   @photo.photo_geometry(:blog_article_main)=> 940x851

original image enter image description here

how want crop enter image description here

and afterenter image description here


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