創建一個圓形,然后從中減去另一個圓形,將其設置為剪輯&你最終可能會得到所需的東西.要隱藏剪輯的粗糙邊緣,請繪制形狀的2px寬筆觸.

import java.awt.*;

import java.awt.geom.*;

import java.awt.image.BufferedImage;

import java.net.URL;

import javax.imageio.ImageIO;

import javax.swing.*;

public class OneRing {

OneRing(BufferedImage imageBG, BufferedImage imageFG) {

// presumes the images are identical in size BNI

int w = imageBG.getWidth();

int h = imageBG.getHeight();

Ellipse2D.Double ellipse1 = new Ellipse2D.Double(

w/16,h/16,7*w/8,7*h/8);

Ellipse2D.Double ellipse2 = new Ellipse2D.Double(

w/4,h/4,w/2,h/2);

Area circle = new Area(ellipse1);

circle.subtract(new Area(ellipse2));

Graphics2D g = imageBG.createGraphics();

g.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);

g.setRenderingHint(RenderingHints.KEY_DITHERING, RenderingHints.VALUE_DITHER_ENABLE);

g.setRenderingHint(RenderingHints.KEY_FRACTIONALMETRICS, RenderingHints.VALUE_FRACTIONALMETRICS_ON);

g.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BICUBIC);

g.setClip(circle);

g.drawImage(imageFG, 0, 0, null);

g.setClip(null);

Stroke s = new BasicStroke(2);

g.setStroke(s);

g.setColor(Color.BLACK);

g.draw(circle);

g.dispose();

JLabel l = new JLabel(new ImageIcon(imageBG));

JOptionPane.showMessageDialog(null, l);

}

public static void main(String[] args) throws Exception {

URL urlFG = new URL("http://i.stack.imgur.com/OVOg3.jpg");

URL urlBG = new URL("http://i.stack.imgur.com/lxthA.jpg");

final BufferedImage biFG = ImageIO.read(urlFG);

final BufferedImage biBG = ImageIO.read(urlBG);

SwingUtilities.invokeLater(new Runnable(){

@Override

public void run() {

new OneRing(biBG, biFG);

}

});

}

}

總結

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