Question

I am developing a Web Album using Grails and for image processing, I am using grails-image-tools plugin. I need a functionality to resize the images if the uploaded images size is too big (for eg: more than 600 * 840 ) . In this case I need to resize this image to 600 * 840). What is the most efficient way to do this? Thanks a lot.

Answer 1

import java.awt.Image as AWTImage  import java.awt.image.BufferedImage       import javax.swing.ImageIcon  import javax.imageio.ImageIO as IIO   import java.awt.Graphics2D   static resize = { bytes, out, maxW, maxH ->      AWTImage ai = new ImageIcon(bytes).image      int width = ai.getWidth( null )      int height = ai.getHeight( null )      def limits = 300..2000      assert limits.contains( width ) && limits.contains( height ) : 'Picture is either too small or too big!'      float aspectRatio = width / height float requiredAspectRatio = maxW / maxH      int dstW = 0      int dstH = 0      if (requiredAspectRatio < aspectRatio) {          dstW = maxW dstH = Math.round( maxW / aspectRatio)      } else {          dstH = maxH dstW = Math.round(maxH * aspectRatio)      }      BufferedImage bi = new BufferedImage(dstW, dstH,   BufferedImage.TYPE_INT_RGB)                 Graphics2D g2d = bi.createGraphics() g2d.drawImage(ai, 0, 0, dstW, dstH, null, null)       IIO.write( bi, 'JPEG', out ) }