CODEWITHSUNDEEP
javagrails-plugingrails-2.0
Umair Saleem
Umair Saleem

Reputation: 1063

Resize uploaded images for better viewing

I have a profile picture which i stored in database in a byte[] field.

What I want do is to create image thumbnails at runtime. Because I have to show images in different sizes on different place on a web page. Something like facebook, which show image in a comment section and other areas.

Any grails plugin which i can use, i have google imageTool, imageMagick grails plugin. Anyone can recommend the plugin for any other approach to do that.

Thanks.

Upvotes: 3

Views: 710

Answers (1)

Mukul Goel
Mukul Goel

Reputation: 8467

Yes there is a grails plugin that you can use.

See this ImageTools plugin

After installing the plugin you may use following statement to generate thumbnail of desired size

Or if its a thin app and you dont want external dependencies.. you may use the following code Source

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 ) 

  }

Upvotes: 1

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