我正在使用Grails开发网络相册,并且用于图像处理,我正在使用grails-image-tools插件。如果上传的图像尺寸太大(例如:大于600 * 840),我需要一种功能来调整图像的尺寸。在这种情况下,我需要将此图像调整为600 * 840)。最有效的方法是什么?非常感谢。

最佳答案

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 )
}

08-15 21:16