java - 我无法将图像(中间混合)保存到文件？

Question

我尝试查看 Oracle 关于写入/保存图像的建议，但我所做的一切都不起作用。我有一个开始按钮，可以开始将两张图像从一张图像混合到另一张图像。然后是一个停止按钮来中途停止混合(或任何你想要的地方)，然后我有一个 saveImage 按钮，希望它捕获当前状态的图像并将其保存到文件中。但如何呢？这是来自 Frame.java 的代码

import java.awt.AlphaComposite;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.image.BufferedImage;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JPanel;
import javax.swing.Timer;

class Frame extends JPanel implements ActionListener {

private static final long serialVersionUID = 1L;
private Image MeSmaller1;
private Image MeSmaller2;
protected Timer timer;
private float alpha;

JPanel pnlButton = new JPanel();
static JButton btnStartBlend = new JButton("Start Blend");
static JButton btnStopBlend = new JButton("Stop Blend");
static JButton saveImage = new JButton("Save Image To File");

public Frame() {

    loadImages();
    initTimer();

    pnlButton.add(btnStartBlend);
    this.add(pnlButton);
    pnlButton.add(btnStopBlend);
    this.add(pnlButton);
    pnlButton.add(saveImage);
    this.add(pnlButton);

    addListeners();
 }
    // start button actionlistener
 public void addListeners() {
    btnStartBlend.addActionListener(new ActionListener() {
        @Override
        public void actionPerformed(ActionEvent e) {
            initTimer();
            timer.start();

            System.out.println("Timer started");
        }
    });
    // stop button actionlistener
    btnStopBlend.addActionListener(new ActionListener() {
        @Override
        public void actionPerformed(ActionEvent e) {
            // initTimer();
            timer.stop();

            System.out.println("Timer stopped");
        }
    });
    // Save button actionlistener
    saveImage.addActionListener(new ActionListener() {
        @Override
        public void actionPerformed(ActionEvent e) {

            System.out.println("Save image clicked");
        }
    });
}

private void loadImages() {
    MeSmaller1 = new ImageIcon("MeSmaller1.jpg").getImage();
    MeSmaller2 = new ImageIcon("MeSmaller2.jpg").getImage();
 }

 public void initTimer() {

    timer = new Timer(1000, this);
    timer.start();
    timer.stop();
    alpha = 1f;
 }

 private void doDrawing(Graphics g) {
    Graphics2D g2Dim = (Graphics2D) g;
    // below sets the size of picture
    BufferedImage buffImage = new BufferedImage(400, 600,
            BufferedImage.TYPE_INT_ARGB);


    Graphics2D gBuffI = buffImage.createGraphics();
    AlphaComposite aComp = AlphaComposite.getInstance(
            AlphaComposite.SRC_OVER, alpha);
    // decides where images are drawn in JFrame
    gBuffI.drawImage(MeSmaller1, 28, 55, null);
    gBuffI.setComposite(aComp);
    gBuffI.drawImage(MeSmaller2, 30, 48, null);
    g2Dim.drawImage(buffImage, 10, 10, null);
 }

 public static void saveToFile(BufferedImage img) {


 }
 @Override

public void paintComponent(Graphics g) {
    super.paintComponent(g);
    doDrawing(g);
}

@Override
public void actionPerformed(ActionEvent e) {
    alpha -= 0.1;
    if (alpha <= 0) {
        alpha = 0;
        timer.stop();
        System.out.println("Morph Finished please restart.");
    }
    repaint();
}

}

任何人都可以帮助这里，它只是不起作用。还有另一个类PictureMorph.java

import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;

public class PictureMorph extends JFrame {

private static final long serialVersionUID = 1L;

    public PictureMorph() {
    initUI();
}

private void initUI() {
    JFrame frame = new JFrame ("Image Morph");
    setTitle("Facial Image Manipulation");
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    add(new Frame());
    // below set Frame Size around image
    setSize(380, 470);
    setLocationRelativeTo(null);

}

    public static void main(String[] args) {
    SwingUtilities.invokeLater(new Runnable() {
        @Override
        public void run() {
            PictureMorph picMorph = new PictureMorph();
            picMorph.setVisible(true);
        }
    });
 }
  }

还有 3 个类(我认为现在实际上可能是多余的？)，称为 BtnStartBlendListener、BtnStopBlendListener、SaveImageListener，它们根本不包含太多代码。有人可以帮忙吗？

Answer 1

要使用 JFileChooser 并最终获得用户友好的文件选择器，您可以这样做:

 private static Frame workFrame;

 public static Frame getWorkFrame() {
        return workFrame;
 }

 public static void setWorkFrame(Frame frame) {
    workFrame = frame;
 }

然后按以下方式修改保存方法(签名更改，并且我还注释了使用 Scanner 的代码并将其替换为 JFileChooser)

 public static void save(BufferedImage img, Frame frame) {

    //  Scanner scan = new Scanner(System.in);
    //  System.out.println("Enter the file name: ");
    //  String fileFullPath = scan.next();
        String fileFullPath = getFileToSaveTo(frame);
        file = new File(fileFullPath);
        saveToFile(img, file);

}

添加以下方法:

    public static String getFileToSaveTo(Frame frame) {
        JFileChooser fc=new JFileChooser();
          int returnVal=fc.showOpenDialog(frame);
          if (returnVal == JFileChooser.APPROVE_OPTION) {
            return fc.getSelectedFile().getAbsolutePath();
          }
         else {
            return null;
          }
    }

在您的主方法中进行类似 Frame.setWorkFrame(fr); 的调用，其中 fr 定义为 Frame fr = new Frame();

这应该可以使其与 JFileChooser 一起使用。例如，这是我在主方法中调用程序的方式

  public static void main(String[] args) {
        JFrame theFrame = new JFrame("Testing catess...");
        theFrame.setSize(400, 400);
        Frame fr = new Frame();
        theFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        theFrame.add(fr, BorderLayout.CENTER);
        theFrame.setVisible(true);
        Frame.setWorkFrame(fr);
    }

在我的测试中它运行良好。测试一下并告诉我是否有效