在 Grails 中调整图像大小 [英] Image resize in Grails

问题描述

我正在使用 Grails 开发网络相册，我正在使用 grails-image-tools 插件进行图像处理.如果上传的图像太大(例如:超过 600 * 840)，我需要一个调整图像大小的功能.在这种情况下，我需要将此图像的大小调整为 600 * 840).执行此操作的最有效方法是什么?非常感谢.

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.

推荐答案

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 )
} 

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