import java.awt.*;

import java.awt.image.*;

import javax.swing.*;

public class ReflectImageBuilder {

publicstaticenumMode {

LINEAR, EXP

}

public static Image createReflectImage(Image img) {

return createReflectImage(img, Mode.LINEAR);

}

public static Image createReflectImage(Image img, Mode mode) {

// 从图片中提取像素数据

int w = img.getWidth(null);

int h = img.getHeight(null);

int[] pixels = new int[w * h];

PixelGrabber pg = new PixelGrabber(img, 0, 0, w, h, pixels, 0, w);

try {

pg.grabPixels();

} catch (Exception ex) {

}

for (int y = 0; y < h; ++y) {

float p = (float) (y) / h; //每一行的透明度0~255

if (mode == Mode.EXP) {

p *= p;

}

int a = (int) (p * 255);

for (int x = 0; x < w; ++x) {

int rgb = pixels[y * w + x] & 0xFFFFFF;

pixels[y * w + x] = (a << 24) | rgb;

}

}

//翻转图像

for (int y = 0; y < h / 2; ++y) {

for (int x = 0; x < w; ++x) {

int temp = pixels[y * w + x];

pixels[y * w + x] = pixels[(h - 1 - y) * w + x];

pixels[(h - 1 - y) * w + x] = temp;

}

}

// 使用像素数据创建镜面图像

MemoryImageSource source = new MemoryImageSource(w, h, pixels, 0, w);

Image reflectImg = Toolkit.getDefaultToolkit().createImage(source);

pixels = null;

return reflectImg;

}

public static void main(String[] args) {

String imgName = "a.jpg";

if (args.length == 1) {

imgName = args[0];

}

Image srcImage = new ImageIcon(imgName).getImage();

Image reflectImage = ReflectImageBuilder.createReflectImage(srcImage, ReflectImageBuilder.Mode.EXP);

JPanel panel = new ImagePanel(srcImage, reflectImage);

JFrame frame = new JFrame();

frame.getContentPane().add(panel);

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

frame.setSize(600, 800);

frame.setVisible(true);

}

}

class ImagePanel extends JPanel {

private Image srcImg;

private Image reflectImg;

public ImagePanel(Image srcImg, Image reflectImg) {

this.srcImg = srcImg;

this.reflectImg = reflectImg;

}

@Override

protected void paintComponent(Graphics g) {

super.paintComponent(g);

Graphics2D g2d = (Graphics2D) g;

g2d.drawImage(srcImg, 0, 0, this);

g2d.drawImage(reflectImg, 0, srcImg.getHeight(null), this);

}

}