Cropping image - grails controller

CroppingController.groovy

package com.images        

import java.awt.image.BufferedImage
import javax.imageio.ImageIO
import grails.converters.JSON

class CroopingController {
  
  def s3ImageService
  
  def confirmImage(){
          def photoS3Object = s3ImageService.photo(params.original_photo)
          def imageCrooped = cropping(photoS3Object) 
          
          render  ("ok_cropped" as JSON)
  }
  
  private cropping(photoFromS3){
        	
	def posx   = parseIntTheValueDoubleAsString(params.dimension_x)
	def posy   = parseIntTheValueDoubleAsString(params.dimension_y)
	def width  = parseIntTheValueDoubleAsString(params.dimension_w)
	def height = parseIntTheValueDoubleAsString(params.dimension_h)
				
    	BufferedImage image = ImageIO.read(photoFromS3)
		
	withException{
		def position_y = calculatePositonHeight(height,posy,image.height)
		def position_x = calculatePositonWidth(width,posx,image.width)

		return image.getSubimage( position_x, position_y , width , height )
	}

 }

 private withException(closure){
	try{
	   closure()
	}catch(all){
	  log.error "Error when cropping image",all
           render  ("error_cropped" as JSON)
	}
 }
	
 private parseIntTheValueDoubleAsString(value){
	Double.parseDouble(value) as Integer
 }

 private calculatePositonHeight(height,posy,heightOriginal){

	if(isHeightOutOfRaster(height,posy,heightOriginal)){
		return heightOriginal - height
	}
	return posy
 }
 private calculatePositonWidth(width,posx,widthOriginal){
		
	if(isWidthOutOfRaster(width,posx,widthOriginal)){
		return widthOriginal - width
	}
	return posx
 }

 private isHeightOutOfRaster(height,posy,heightOriginal){
	height + posy > heightOriginal
 }
 private isWidthOutOfRaster(width,posx,widthOriginal){
	width + posx > widthOriginal
 }
}