选择，复制和粘贴图像
我希望我的应用做什么：
1 - 选择图像区域并获取坐标。下面的代码应该这样做：
import java.awt.*;
import java.awt.event.*;
import java.awt.image.*;
import javax.swing.*;
public class ScreenCaptureRectangle {
Rectangle captureRect;
ScreenCaptureRectangle(final BufferedImage screen) {
final BufferedImage screenCopy = new BufferedImage(
screen.getWidth(),
screen.getHeight(),
screen.getType());
final JLabel screenLabel = new JLabel(new ImageIcon(screenCopy));
JScrollPane screenScroll = new JScrollPane(screenLabel);
screenScroll.setPreferredSize(new Dimension(
(int)(screen.getWidth()/3),
(int)(screen.getHeight()/3)));
JPanel panel = new JPanel(new BorderLayout());
panel.add(screenScroll, BorderLayout.CENTER);
final JLabel selectionLabel = new JLabel(
"Drag a rectangle in the screen shot!");
panel.add(selectionLabel, BorderLayout.SOUTH);
repaint(screen, screenCopy);
screenLabel.repaint();
screenLabel.addMouseMotionListener(new MouseMotionAdapter() {
Point start = new Point();
@Override
public void mouseMoved(MouseEvent me) {
start = me.getPoint();
repaint(screen, screenCopy);
selectionLabel.setText("Start Point: " + start);
screenLabel.repaint();
}
@Override
public void mouseDragged(MouseEvent me) {
Point end = me.getPoint();
captureRect = new Rectangle(start,
new Dimension(end.x-start.x, end.y-start.y));
repaint(screen, screenCopy);
screenLabel.repaint();
selectionLabel.setText("Rectangle: " + captureRect);
}
});
JOptionPane.showMessageDialog(null, panel);
System.out.println("Rectangle of interest: " + captureRect);
}
public void repaint(BufferedImage orig, BufferedImage copy) {
Graphics2D g = copy.createGraphics();
g.drawImage(orig,0,0, null);
if (captureRect!=null) {
g.setColor(Color.RED);
g.draw(captureRect);
g.setColor(new Color(255,255,255,150));
g.fill(captureRect);
}
g.dispose();
}
public static void main(String[] args) throws Exception {
Robot robot = new Robot();
final Dimension screenSize = Toolkit.getDefaultToolkit().
getScreenSize();
final BufferedImage screen = robot.createScreenCapture(
new Rectangle(screenSize));
SwingUtilities.invokeLater(new Runnable() {
public void run() {
new ScreenCaptureRectangle(screen);
}
});
}
}
2 - 获取坐标并在getSubimage方法上使用它。
double w = captureRect.getWidth();
double h = captureRect.getHeight();
double x = captureRect.getX();
double y = captureRect.getY();
int W = (int) w;
int H = (int) h;
int X = (int) x;
int Y = (int) y;
BufferedImage selectImg = screen.getSubimage(x, y, w, h);
3 - 此代码创建一个新的图像文件并复制所选的图像。
BufferedImage img = new BufferedImage ( 5000, 5000, BufferedImage.TYPE_INT_RGB );
img.createGraphics().drawImage(selectImg, 0, 0, null);
File final_image = new File("C:/Final.jpg");
ImageIO.write(img, "jpeg", final_image);
app的想法是：
- 选择图像区域
- 复制该图像并粘贴到其他文件中。 （当我按下任何按钮时）
- 程序将继续运行，直到我按下另一个按钮
- 我复制程序的每张图像都会将其粘贴到最后一张图像旁边。
我认为我接近解决方案。任何人都可以帮助我连接部件＆＃34; ？
2 个答案:
答案 0 :(得分：2)
首先看看：
- How to Write a Mouse Listener
- How to Use Buttons, Check Boxes, and Radio Buttons
- How to Write an Action Listeners
- Performing Custom Painting
- Writing/Saving an Image
您需要掌握所拥有的概念，并将其重新设计为一个连贯的可行解决方案。也就是说，在您需要的区域之间提供功能（选择区域并保存文件），以便它们一起干净地工作......
以下示例采用屏幕截图，允许您选择区域，单击“保存”，文件将被保存。该示例检查当前目录中已有多少文件并将计数增加1，因此您不会覆盖现有文件...
import java.awt.AWTException;
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Point;
import java.awt.Rectangle;
import java.awt.Robot;
import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileFilter;
import java.io.IOException;
import javax.imageio.ImageIO;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
public class ScreenImage {
public static void main(String[] args) {
new ScreenImage();
}
public ScreenImage() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
ex.printStackTrace();
}
try {
Robot robot = new Robot();
final Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
final BufferedImage screen = robot.createScreenCapture(new Rectangle(screenSize));
JFrame frame = new JFrame("Testing");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(new TestPane(screen));
frame.setSize(400, 400);
frame.setLocationRelativeTo(null);
frame.setVisible(true);
} catch (AWTException exp) {
exp.printStackTrace();
}
}
});
}
public class TestPane extends JPanel {
private BufferedImage master;
public TestPane(BufferedImage image) {
this.master = image;
setLayout(new BorderLayout());
final ImagePane imagePane = new ImagePane(image);
add(new JScrollPane(imagePane));
JButton btnSave = new JButton("Save");
add(btnSave, BorderLayout.SOUTH);
btnSave.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
try {
BufferedImage img = imagePane.getSubImage();
master = append(master, img);
File save = new File("Capture.png");
ImageIO.write(master, "png", save);
imagePane.clearSelection();
JOptionPane.showMessageDialog(TestPane.this, save.getName() + " was saved", "Saved", JOptionPane.INFORMATION_MESSAGE);
} catch (IOException ex) {
ex.printStackTrace();
JOptionPane.showMessageDialog(TestPane.this, "Failed to save capture", "Error", JOptionPane.ERROR_MESSAGE);
}
}
public BufferedImage append(BufferedImage master, BufferedImage sub) {
// Create a new image which can hold both background and the
// new image...
BufferedImage newImage = new BufferedImage(
master.getWidth() + sub.getWidth(),
Math.max(master.getHeight(), sub.getHeight()),
BufferedImage.TYPE_INT_ARGB);
// Get new image's Graphics context
Graphics2D g2d = newImage.createGraphics();
// Draw the old background
g2d.drawImage(master, 0, 0, null);
// Position and paint the new sub image...
int y = (newImage.getHeight() - sub.getHeight()) / 2;
g2d.drawImage(sub, master.getWidth(), y, null);
g2d.dispose();
return newImage;
}
});
}
}
public class ImagePane extends JPanel {
private BufferedImage background;
private Rectangle selection;
public ImagePane(BufferedImage img) {
background = img;
MouseAdapter ma = new MouseAdapter() {
private Point clickPoint;
@Override
public void mousePressed(MouseEvent e) {
clickPoint = e.getPoint();
}
@Override
public void mouseDragged(MouseEvent e) {
Point dragPoint = e.getPoint();
int x = Math.min(clickPoint.x, dragPoint.x);
int y = Math.min(clickPoint.y, dragPoint.y);
int width = Math.abs(clickPoint.x - dragPoint.x);
int height = Math.abs(clickPoint.y - dragPoint.y);
selection = new Rectangle(x, y, width, height);
repaint();
}
};
addMouseListener(ma);
addMouseMotionListener(ma);
}
public void clearSelection() {
selection = null;
repaint();
}
public BufferedImage getSubImage() {
BufferedImage img = null;
if (selection != null) {
img = background.getSubimage(selection.x, selection.y, selection.width, selection.height);
}
return img;
}
@Override
public Dimension getPreferredSize() {
return new Dimension(background.getWidth(), background.getHeight());
}
@Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
Graphics2D g2d = (Graphics2D) g.create();
int x = (getWidth() - background.getWidth()) / 2;
int y = (getHeight() - background.getHeight()) / 2;
g2d.drawImage(background, x, y, this);
if (selection != null) {
Color stroke = UIManager.getColor("List.selectionBackground");
Color fill = new Color(stroke.getRed(), stroke.getGreen(), stroke.getBlue(), 128);
g2d.setColor(fill);
g2d.fill(selection);
g2d.setColor(stroke);
g2d.draw(selection);
}
g2d.dispose();
}
}
}
除了渲染选择之外，最难的部分是生成结果图像......
基本上，这是通过创建一个新的BufferedImage并将旧图像和新的子图像一起绘制来完成的。
public BufferedImage append(BufferedImage master, BufferedImage sub) {
// Create a new image which can hold both background and the
// new image...
BufferedImage newImage = new BufferedImage(
master.getWidth() + sub.getWidth(),
Math.max(master.getHeight(), sub.getHeight()),
BufferedImage.TYPE_INT_ARGB);
// Get new image's Graphics context
Graphics2D g2d = newImage.createGraphics();
// Draw the old background
g2d.drawImage(master, 0, 0, null);
// Position and paint the new sub image...
int y = (newImage.getHeight() - sub.getHeight()) / 2;
g2d.drawImage(sub, master.getWidth(), y, null);
g2d.dispose();
return newImage;
}
该示例将先前（主）图像替换为此处创建的图像，因此它将不断将新图像附加到其末尾...
答案 1 :(得分：0)
按下并释放按钮需要更多听众.. mouseMoved中的某些行也最好放在mousePressed。
您希望在释放鼠标时更新captureRect（使用mouseReleased方法）
然后你就把它写到文件中。您可以根据自己的需要调整其他事项。
为清楚起见，最好在您的用户界面中添加保存按钮。
public class ScreenCaptureRectangle {
Rectangle captureRect;
Point start = new Point();
SimpleDateFormat sdf;
ScreenCaptureRectangle(final BufferedImage screen) {
sdf = new SimpleDateFormat("yyyy-MM-dd HH-mm-ss");
final BufferedImage screenCopy = new BufferedImage(
screen.getWidth(),
screen.getHeight(),
screen.getType());
final JLabel screenLabel = new JLabel(new ImageIcon(screenCopy));
JScrollPane screenScroll = new JScrollPane(screenLabel);
screenScroll.setPreferredSize(new Dimension(
(int) (screen.getWidth() / 3),
(int) (screen.getHeight() / 3)));
JPanel panel = new JPanel(new BorderLayout());
panel.add(screenScroll, BorderLayout.CENTER);
JButton btnSave = new JButton("SAVE");
btnSave.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent ae) {
double w = captureRect.getWidth();
double h = captureRect.getHeight();
double x = captureRect.getX();
double y = captureRect.getY();
int W = (int) w;
int H = (int) h;
int X = (int) x;
int Y = (int) y;
BufferedImage selectImg = screen.getSubimage(X, Y, W, H);
try {
String fName = generateFileName();
if (fName != null) {
File f = new File(fName);
if (f.createNewFile()) {
ImageIO.write(selectImg, "jpg", f);
}
}
} catch (IOException ex) {
Logger.getLogger(ScreenCaptureRectangle.class.getName()).log(Level.SEVERE, null, ex);
}
}
});
panel.add(btnSave, BorderLayout.AFTER_LAST_LINE);
final JLabel selectionLabel = new JLabel(
"Drag a rectangle in the screen shot!");
panel.add(selectionLabel, BorderLayout.SOUTH);
repaint(screen, screenCopy);
screenLabel.repaint();
screenLabel.addMouseMotionListener(new MouseMotionAdapter() {
@Override
public void mouseDragged(MouseEvent me) {
Point end = me.getPoint();
captureRect = new Rectangle(start,
new Dimension(end.x - start.x, end.y - start.y));
repaint(screen, screenCopy);
screenLabel.repaint();
selectionLabel.setText("Rectangle: " + captureRect);
}
});
screenLabel.addMouseListener(new MouseAdapter() {
@Override
public void mousePressed(MouseEvent me) {
start = me.getPoint();
repaint(screen, screenCopy);
selectionLabel.setText("Start Point: " + start);
screenLabel.repaint();
}
@Override
public void mouseReleased(MouseEvent me) {
int endX = me.getX();
int endY = me.getY();
if (endX > start.x && endY > start.y) {
captureRect = new Rectangle(start.x, start.y, endX-start.x, endY-start.y);
System.out.println("Rectangle of interest: " + captureRect);
}
}
});
JOptionPane.showMessageDialog(null, panel);
}
private String generateFileName() {
return new StringBuilder("screencrop_").append(sdf.format(new Date())).append(".jpg").toString();
}
public void repaint(BufferedImage orig, BufferedImage copy) {
Graphics2D g = copy.createGraphics();
g.drawImage(orig, 0, 0, null);
if (captureRect != null) {
g.setColor(Color.RED);
g.draw(captureRect);
g.setColor(new Color(255, 255, 255, 150));
g.fill(captureRect);
}
g.dispose();
}
public static void main(String[] args) throws Exception {
Robot robot = new Robot();
final Dimension screenSize = Toolkit.getDefaultToolkit().
getScreenSize();
final BufferedImage screen = robot.createScreenCapture(
new Rectangle(screenSize));
SwingUtilities.invokeLater(new Runnable() {
public void run() {
new ScreenCaptureRectangle(screen);
}
});
}
}
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