求助－图片旋转后丢失部分图片

[lengkuheixia]

点击旋转（rotate）后的图片被截掉了一部分边角，不知是哪的问题，求高手帮小弟看下

import java.awt.event.*;
import java.awt.geom.*;
import java.awt.image.*;
import java.io.*;
import javax.swing.*;
import java.awt.*;


public class ImageProcessingTest {
public static void main(String[] args) {
JFrame frame = new ImageProcessingFrame();
// frame.show();
frame.setVisible(true);
}
}


class ImageProcessingFrame extends JFrame implements ActionListener {
public ImageProcessingFrame() {
setTitle("ImageProcessingTest");
setSize(300, 400);
addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});

Container contentPane = getContentPane();
panel = new ImageProcessingPanel();
contentPane.add(panel, "Center");

JMenu fileMenu = new JMenu("File");
openItem = new JMenuItem("Open");
openItem.addActionListener(this);
fileMenu.add(openItem);

exitItem = new JMenuItem("Exit");
exitItem.addActionListener(this);
fileMenu.add(exitItem);

JMenu editMenu = new JMenu("Edit");
blurItem = new JMenuItem("Blur");
blurItem.addActionListener(this);
editMenu.add(blurItem);

sharpenItem = new JMenuItem("Sharpen");
sharpenItem.addActionListener(this);
editMenu.add(sharpenItem);

brightenItem = new JMenuItem("Brighten");
brightenItem.addActionListener(this);
editMenu.add(brightenItem);

edgeDetectItem = new JMenuItem("Edge detect");
edgeDetectItem.addActionListener(this);
editMenu.add(edgeDetectItem);

negativeItem = new JMenuItem("Negative");
negativeItem.addActionListener(this);
editMenu.add(negativeItem);

rotateItem = new JMenuItem("Rotate");
rotateItem.addActionListener(this);
editMenu.add(rotateItem);

JMenuBar menuBar = new JMenuBar();
menuBar.add(fileMenu);
menuBar.add(editMenu);
setJMenuBar(menuBar);
}

public void actionPerformed(ActionEvent evt) {
Object source = evt.getSource();
if (source == openItem) {
JFileChooser chooser = new JFileChooser();
chooser.setCurrentDirectory(new File("."));

chooser.setFileFilter(new javax.swing.filechooser.FileFilter() {
public boolean accept(File f) {
String name = f.getName().toLowerCase();
return name.endsWith(".gif") || name.endsWith(".jpg") ||
name.endsWith(".jpeg") || f.isDirectory();
}

public String getDescription() {
return "Image files";
}
});

int r = chooser.showOpenDialog(this);
if (r == JFileChooser.APPROVE_OPTION) {
String name = chooser.getSelectedFile().getAbsolutePath();
panel.loadImage(name);
}
} else if (source == exitItem) {
System.exit(0);
} else if (source == blurItem) {
panel.blur();
} else if (source == sharpenItem) {
panel.sharpen();
} else if (source == brightenItem) {
panel.brighten();
} else if (source == edgeDetectItem) {
panel.edgeDetect();
} else if (source == negativeItem) {
panel.negative();
} else if (source == rotateItem) {
panel.rotate();
}
}

private ImageProcessingPanel panel;
private JMenuItem openItem;
private JMenuItem exitItem;
private JMenuItem blurItem;
private JMenuItem sharpenItem;
private JMenuItem brightenItem;
private JMenuItem edgeDetectItem;
private JMenuItem negativeItem;
private JMenuItem rotateItem;
}


class ImageProcessingPanel extends JPanel {
public void paintComponent(Graphics g) {
// super.paintComponent(g);
// super.paint(g);
if (image != null) {
g.drawImage(image, 0, 0, null);
}
}

public void loadImage(String name) {
Image loadedImage = Toolkit.getDefaultToolkit().getImage(name);
MediaTracker tracker = new MediaTracker(this);
tracker.addImage(loadedImage, 0);
try {
tracker.waitForID(0);
} catch (InterruptedException e) {}
image = new BufferedImage(loadedImage.getWidth(null),
loadedImage.getHeight(null),
BufferedImage.TYPE_INT_RGB);
Graphics2D g2 = image.createGraphics();
g2.drawImage(loadedImage, 0, 0, null);

repaint();
}

private void filter(BufferedImageOp op) {
BufferedImage filteredImage = new BufferedImage(image.getWidth(),
image.getHeight(), BufferedImage.TYPE_INT_ARGB);
op.filter(image, filteredImage);
image = filteredImage;
repaint();
}

private void convolve(float[] elements) {
Kernel kernel = new Kernel(3, 3, elements);
ConvolveOp op = new ConvolveOp(kernel);
filter(op);
}

public void blur() {
float weight = 1.0f / 9.0f;
float[] elements = new float[9];
for (int i = 0; i < 9; i++) {
elements[i] = weight;
}
convolve(elements);
}

public void sharpen() {
float[] elements = {0.0f, -1.0f, 0.0f, -1.0f, 5.f, -1.0f, 0.0f, -1.0f,
0.0f};
convolve(elements);
}

void edgeDetect() {
float[] elements = {0.0f, -1.0f, 0.0f, -1.0f, 4.f, -1.0f, 0.0f, -1.0f,
0.0f};
convolve(elements);
}

public void brighten() {
float a = 1.5f;
float b = -20.0f;
RescaleOp op = new RescaleOp(a, b, null);
filter(op);
}

void negative() {
byte negative[] = new byte[256];
for (int i = 0; i < 256; i++) {
negative[i] = (byte) (255 - i);
}
ByteLookupTable table = new ByteLookupTable(0, negative);
LookupOp op = new LookupOp(table, null);
filter(op);
}

void rotate() {
AffineTransform transform = AffineTransform.getRotateInstance(Math.
toRadians(30), image.getWidth() / 2, image.getHeight() / 2);
AffineTransformOp op = new AffineTransformOp(transform,
AffineTransformOp.TYPE_BILINEAR);
filter(op);
}

private BufferedImage image;
}

[dracularking]

旋转超出视界了自然就看不见了
先平移(translate)再旋转

[lengkuheixia]

旋转后，图片后面的那个黑色矩形框是什么啊，可不可以随着图片一起旋转啊，望兄弟们给个解决办法

[lengkuheixia]

按dracularking兄的办法去做，图片是一边平移一边旋转，我是想让图片围绕原点固定旋转

[chenweionline]

你的程序里filter()方法中设置旋转之后的BufferedImage大小还是原图的大小，那么肯定会被裁掉多余区域呀。
比如一个固定位置的矩形盒子里放了个矩形，你把矩形拿出来以矩形中心为锚点旋转45度，那么位置不变的话还能再放进盒子里吗？

解决这个问题你要么重新设置旋转后的BufferedImage大小，要么旋转前先缩小原始BufferedImage。