圖片縮放的Java類

by57 9年前發布 | 2K 次閱讀 Java 

import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.image.BufferedImage;
import java.awt.image.ColorModel;


import com.jhlabs.image.AbstractBufferedImageOp;


/**


    

  • Scales an image using the area-averaging algorithm, which can't be done with AffineTransformOp.
*/
public class MyScaleFilter extends AbstractBufferedImageOp {
    

    private int width;
 private int height;
    

    /**
    

      

    • Construct a ScaleFilter.
*/
public MyScaleFilter() {
 this(32, 32);
}
      

      /**
      

      • 

    • Construct a ScaleFilter.
      • 

    • @param width the width to scale to
      • 

    • @param height the height to scale to
*/
public MyScaleFilter( int width, int height ) {
 this.width = width;
 this.height = height;
}
      

      public BufferedImage filter( BufferedImage src, BufferedImage dst ) {
 if ( dst == null ) {
      


       ColorModel dstCM = src.getColorModel();
 dst = new BufferedImage(dstCM, 
     dstCM.createCompatibleWritableRaster( width, height ), 
     dstCM.isAlphaPremultiplied(), null);

      

      }
      

      Image scaleImage = src.getScaledInstance( width, height, Image.SCALE_SMOOTH );
 Graphics2D g = dst.createGraphics();
 g.drawImage( scaleImage, 0, 0, width, height, null );
 g.dispose();
      

      return dst;
}
      

      public String toString() {
 return "Distort/Scale";
}
      

      • 

    

    • 



}</pre>
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