我有以下问题：
我不知道为什么我的功能在显示已旋转的图像时，只显示了与给出照片一样多的jpanel中的一个。 让我举一个例子：我将4个图像加载到hashmap中。然后我将它们放入我的旋转功能并尝试显示它们。我最终得到了一张旋转图像的4个标签。
当我尝试使用与之前使用的相同的深度旋转两次时（我使用滑块获取度数）它不再旋转但是如果我触摸滑块并移动它，则该功能正常旋转
我不知道如何将Image类型转换为File对象，因此我将其转换为BufferedImage，然后转换为File。我浏览了互联网，但找不到任何有用的东西。
我的主要代码：
JPanel panel_2e = new JPanel();
panel_2e.setOpaque(true);
panel_2e.setBorder(BorderFactory.createTitledBorder(BorderFactory.createEtchedBorder(EtchedBorder.RAISED, Color.GRAY, Color.DARK_GRAY), "Rotate options"));
panel_2e.setLayout(new BoxLayout(panel_2e,BoxLayout.Y_AXIS));
JSlider slider = new JSlider(JSlider.HORIZONTAL, 0, 360, 180);
slider.setMinorTickSpacing(10);
slider.setMajorTickSpacing(90);
slider.setPaintTicks(true);
slider.setPaintLabels(true);
slider.setLabelTable(slider.createStandardLabels(45));
JPanel radio_buttons_rotate=new JPanel();
radio_buttons_rotate.setLayout(new BoxLayout(radio_buttons_rotate, BoxLayout.Y_AXIS));
JCheckBox cut_frame = new JCheckBox("Cut edges");
cut_frame.setSelected(true);
cut_frame.addItemListener(new ItemListener() {
public void itemStateChanged(ItemEvent e) {
if(e.getStateChange() == ItemEvent.SELECTED)
{check = true;
System.out.println("Cut-edge mode selected");}
else
{check = false;
System.out.println("Cut-edge mode deselected");}
}
});
cut_frame.setBounds(78, 41, 60, 23);
radio_buttons_rotate.add(cut_frame);
JRadioButton black_rdbutton = new JRadioButton("Black background");
black_rdbutton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
black = true;
}
});
black_rdbutton.setBounds(78, 41, 60, 23);
radio_buttons_rotate.add(black_rdbutton);
JRadioButton white_rdbutton = new JRadioButton("White background");
white_rdbutton.setSelected(true);
white_rdbutton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
black = false;
}
});
white_rdbutton.setBounds(78, 41, 60, 23);
radio_buttons_rotate.add(white_rdbutton);
ButtonGroup group_frame_rotate = new ButtonGroup();
group_frame_rotate.add(black_rdbutton);
group_frame_rotate.add(white_rdbutton);
panel_2e.add(radio_buttons_rotate);
JLabel Rotate = new JLabel();
Rotate.setText(deg+"\u00b0");
panel_2e.add(slider);
JButton btnRotate = new JButton("Rotate");
JPanel RotatePanel=new JPanel();
RotatePanel.add(Rotate);
RotatePanel.add(btnRotate);
RotatePanel.setLayout(new FlowLayout());
btnRotate.setBounds(28, 158, 89, 23);
btnRotate.setBackground(Color.DARK_GRAY);
btnRotate.setForeground(Color.WHITE);
panel_2e.add(RotatePanel);
panel_2.add(panel_2e);
slider.addChangeListener(new ChangeListener() {
public void stateChanged(ChangeEvent ce) {
deg=((JSlider) ce.getSource()).getValue();
Rotate.setText(deg+"\u00b0"); }
});
btnRotate.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
if(AddDirectory.all_chosen.isEmpty())
{Object[] options = {"OK"};
int n = JOptionPane.showOptionDialog(frame,
"Please choose at least 1 image to rotate.","Empty work list",
JOptionPane.PLAIN_MESSAGE,
JOptionPane.QUESTION_MESSAGE,
null,
options,
options[0]);}
else
{RotateFunction rot = new RotateFunction(AddDirectory.all_chosen);
rot.main();
BufferedImage kk = null;
Display disp= new Display(); // invoke Display class
for(File i : all_chosen_images.values()){
try{
kk = ImageIO.read(new File(i.getAbsolutePath()));
disp.createFrame(center, i, kk); //create new frame with image
}
catch (IOException es){
es.printStackTrace();
}
}
}
}
});
这是我的旋转功能：
public class RotateFunction{
HashMap<JButton,File> map;
Image spiral;
RotateFunction(HashMap<JButton,File> source_of_image)
{
map = AddDirectory.all_chosen;
}
public void main(){
int counter = 0;
if (spiral == null){
for(Map.Entry<JButton, File> entry: map.entrySet()) //////Moving through hashMap
{
try {
spiral = getImage(entry.getValue().getAbsolutePath());
counter++;
System.out.println("Path of image " + counter + " : " +entry.getValue().getAbsolutePath());
if (PhotoEdit.check == true){
rotateImage(PhotoEdit.deg, null);
System.out.println("Rotating image "+counter+" by "+PhotoEdit.deg+" degrees (edge cut)");
}
else{
rotateImage1(PhotoEdit.deg, null);
System.out.println("Rotating image "+counter+" by "+PhotoEdit.deg+" degrees (bigger frame)");
}
BufferedImage tmp = toBufferedImage(spiral);
File f;
f = new File( "image.png" );
try
{
ImageIO.write( tmp, "PNG", f );
}
catch ( IOException x )
{
// Complain if there was any problem writing
// the output file.
x.printStackTrace();
}
map.put(entry.getKey(), f);
}
catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
PhotoEdit.all_chosen_images.clear();
PhotoEdit.all_chosen_images.putAll(map); //Putting HashMap with rotated images into global HashMap
System.out.println("Images have been successfully rotated");
}
}
public Image getImage(String path){
Image tempImage = null;
try
{
tempImage = Toolkit.getDefaultToolkit().getImage(path);
}
catch (Exception e)
{
System.out.println("An error occured - " + e.getMessage());
}
return tempImage;
}
////////////////////////////////////////////////////////////////////
///////////////////IMAGE ROTATION /////////////////////////////////
public void rotateImage(double degrees, ImageObserver o){
ImageIcon icon = new ImageIcon(this.spiral);
BufferedImage blankCanvas = new BufferedImage(icon.getIconWidth(), icon.getIconHeight(), BufferedImage.TYPE_INT_ARGB);
Graphics2D g2 = (Graphics2D)blankCanvas.getGraphics();
g2.rotate(Math.toRadians(degrees), icon.getIconWidth()/2, icon.getIconHeight()/2);
g2.drawImage(this.spiral, 0, 0, o);
this.spiral = blankCanvas;
}
public void rotateImage1(double degrees, ImageObserver o){
double sin = Math.abs(Math.sin(Math.toRadians(degrees)));
double cos = Math.abs(Math.cos(Math.toRadians(degrees)));
ImageIcon icon = new ImageIcon(this.spiral);
int w = icon.getIconWidth();
int h = icon.getIconHeight();
int neww = (int)Math.floor(w*cos+h*sin);
int newh = (int)Math.floor(h*cos+w*sin);
BufferedImage blankCanvas = new BufferedImage(neww, newh, BufferedImage.TYPE_INT_ARGB);
Graphics2D g2 = (Graphics2D)blankCanvas.getGraphics();
g2.translate((neww-w)/2, (newh-h)/2);
g2.rotate(Math.toRadians(degrees), icon.getIconWidth()/2, icon.getIconHeight()/2);
g2.drawImage(this.spiral, 0, 0, o);
this.spiral = blankCanvas;
}
//////////////////////////////////////////////////////////////////////////
public static BufferedImage toBufferedImage(Image img)
{
if (img instanceof BufferedImage)
{
return (BufferedImage) img;
}
// Create a buffered image with transparency
BufferedImage bimage = new BufferedImage(img.getWidth(null), img.getHeight(null), BufferedImage.TYPE_INT_ARGB);
// Draw the image on to the buffered image
Graphics2D bGr = bimage.createGraphics();
bGr.drawImage(img, 0, 0, null);
bGr.dispose();
// Return the buffered image
return bimage;
}
}
在显示功能中，我有以下参数 - createFrame（JDekstopPane where_to_put_the_image，File img，BufferedImage image）
HashMap - all_chosen_images是存储所有图像的全局HashMap
真的希望得到你的帮助。 亚历山大