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如何突出顯示主JPanel中的特定子面板?

2021-12-13 13:34:14 .NET開發

我正在為基于迷宮的游戲構建 GUI。

主 JPanel 由我稱為 Tiles 的較小 JPanel 組成。我的目標是當玩家在該單元格中時突出顯示特定的圖塊 JPanel。它看起來像這樣:

如何突出顯示主 JPanel 中的特定子面板?

這是 MRE 的代碼。我認為你可以使用任何 3 個 test.png 。我認為它不起作用,因為上面帶有影像的 JLabel 覆寫了高光。


public class testGui extends JFrame {
  
  private final Board board;
  
  public testGui() {
    
    this.setSize(600, 600);
    this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    this.setResizable(false);

    this.board = new Board();
    JScrollPane scroller = new JScrollPane(board);
    this.add(scroller, BorderLayout.CENTER);
  }
  
  
  
  
  public ImageIcon getImage(int i) {
    

    try {
      
      BufferedImage imageBase = ImageIO.read(getClass().getResource(String.format("/images/test%d.png", i)));
      
      int width = imageBase.getWidth();
      int height = imageBase.getHeight();
      
      BufferedImage combined = new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB);
      Graphics g = combined.getGraphics();
      g.drawImage(imageBase, 0, 0, null);        
        ImageIcon icon = new ImageIcon(combined);
        return icon;

       
  } catch (IOException ex) {
      Logger.getLogger(DungeonGui.class.getName()).log(Level.SEVERE, null, ex);

  }

   return null; 
  }
  
  private class Board extends JPanel {

    public Board() {

      setLayout(new GridBagLayout());
      GridBagConstraints gbc = new GridBagConstraints();
      gbc.gridx = 0;
      gbc.gridy = 0;
      

      for (int i = 0; i < 3; i  ) {
        
        Tile tile = new Tile(i);
        
        cellPanel.setName(String.format("%d", i));
        add(tile, gbc);
        gbc.gridx  ;
        if (gbc.gridx >= 3) {
            gbc.gridx = 0;
            gbc.gridy  ;
        }

if (i ==2) {

//TODO highlight JUST this tile


    }
    }
    
    
   
  }
  

  private class Tile extends JPanel  {
    

    private int i;
    private JLabel label;
    private Color highlight = new Color(0, 0, 255, 128);
    
    public CellPanel(int i) {
      super();
      this.i = i;
      
      this.setLayout(new GridLayout(1, 1));
      
      ImageIcon imageIcon = getImage(i);
      
      this.label = new JLabel(imageIcon);
      this.add(label);
      
      setOpaque(false);
      
    }

    @Override
    public void paintComponent(Graphics g) {
      
      super.paintComponent(g);
      
      ImageIcon imageIcon = getImage(i);
      
      this.label.setIcon(imageIcon);
      
      Graphics2D g2d = (Graphics2D) g.create();
      
      g2d.setColor(highlight);
      g2d.fillRect(0, 0, getWidth(), getHeight());
      g2d.dispose();
      

    }
    
  }
  
  @Override
  public void refresh() {
    
    this.repaint();
  }

  @Override
  public void makeVisible() {

    this.setVisible(true);
    
  }

}

uj5u.com熱心網友回復:

永遠不要從一個paint方法中更新組件的狀態,從長遠來看,這會給你帶來無窮無盡的問題。

如果您想要更多地控制影像,那么您可以考慮創建一個能夠繪制影像的自定義組件,然后執行您想要的任何疊加/突出顯示,例如

public class CellPane extends JPanel {

    private BufferedImage image;
    private boolean highlighted;

    public CellPane(BufferedImage image) {
        this.image = image;
    }

    @Override
    public Dimension getPreferredSize() {
        BufferedImage image = getImage();
        return image == null ? new Dimension(128, 128) : new Dimension(image.getWidth(), image.getHeight());
    }

    public boolean isHighlighted() {
        return highlighted;
    }

    public void setHighlighted(boolean highlighted) {
        this.highlighted = highlighted;
        repaint();
    }

    public BufferedImage getImage() {
        return image;
    }

    @Override
    protected void paintComponent(Graphics g) {
        super.paintComponent(g);
        Graphics2D g2d = (Graphics2D) g.create();
        g2d.drawImage(image, 0, 0, this);
        if (isHighlighted()) {
            g2d.setColor(new Color(0, 0, 255, 128));
            g2d.fillRect(0, 0, getWidth(), getHeight());
        }
        g2d.dispose();
    }

}

可運行示例

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Component;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Point;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.imageio.ImageIO;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;

public class Test {

    public static void main(String[] args) {
        new Test();
    }

    public Test() {
        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                List<Maze.Direction> directions = new ArrayList<>(32);
                directions.add(Maze.Direction.EAST_SOUTH);
                directions.add(Maze.Direction.EAST_SOUTH_WEST);
                directions.add(Maze.Direction.EAST_SOUTH_WEST);
                directions.add(Maze.Direction.EAST_SOUTH_WEST);
                directions.add(Maze.Direction.EAST_SOUTH_WEST);
                directions.add(Maze.Direction.SOUTH_WEST);
                directions.add(Maze.Direction.NORTH_EAST_SOUTH);
                directions.add(Maze.Direction.NORTH_EAST_SOUTH_WEST);
                directions.add(Maze.Direction.NORTH_EAST_SOUTH_WEST);
                directions.add(Maze.Direction.NORTH_EAST_SOUTH_WEST);
                directions.add(Maze.Direction.NORTH_EAST_SOUTH_WEST);
                directions.add(Maze.Direction.NORTH_SOUTH_WEST);
                directions.add(Maze.Direction.NORTH_SOUTH);
                directions.add(Maze.Direction.NORTH_SOUTH);
                directions.add(Maze.Direction.NORTH_SOUTH);
                directions.add(Maze.Direction.NORTH_SOUTH);
                directions.add(Maze.Direction.NORTH_SOUTH);
                directions.add(Maze.Direction.NORTH_SOUTH);
                directions.add(Maze.Direction.NORTH_SOUTH);
                directions.add(Maze.Direction.NORTH_SOUTH);
                directions.add(Maze.Direction.NORTH_SOUTH);
                directions.add(Maze.Direction.NORTH_SOUTH);
                directions.add(Maze.Direction.NORTH_SOUTH);
                directions.add(Maze.Direction.NORTH_SOUTH);
                directions.add(Maze.Direction.NORTH);
                directions.add(Maze.Direction.NORTH);
                directions.add(Maze.Direction.NORTH);
                directions.add(Maze.Direction.NORTH);
                directions.add(Maze.Direction.NORTH);
                directions.add(Maze.Direction.NORTH);

                System.out.println(directions.size());

                Maze maze = new DefaultMaze(5, 6, directions);

                MazeGui frame = new MazeGui(maze);
                frame.addClickListener(null);
                frame.setLocationRelativeTo(null);
                frame.setVisible(true);
            }
        });
    }

    public interface Maze {

        enum Direction {
            EAST_SOUTH("EastSouth.png"), EAST_SOUTH_WEST("EastSouthWest.png"), SOUTH_WEST("SouthWest.png"),
            NORTH_EAST_SOUTH("NorthEastSouth.png"), NORTH_EAST_SOUTH_WEST("NorthEastSouthWest.png"),
            NORTH_SOUTH_WEST("NorthSouthWest.png"), NORTH_SOUTH("NorthSouth.png"), NORTH("North.png");

            private BufferedImage image;

            private Direction(String name) {
                try {
                    image = ImageIO.read(getClass().getResource("/images/"   name));
                } catch (IOException ex) {
                    Logger.getLogger(Test.class.getName()).log(Level.SEVERE, null, ex);
                }
            }

            public BufferedImage getImage() {
                return image;
            }

        }

        public int getRows();

        public int getColumns();

        public Direction getRoomDirections(int index);
    }

    public class DefaultMaze implements Maze {

        int rows;
        int columns;

        private List<Direction> directions;

        public DefaultMaze(int rows, int columns, List<Direction> directions) {
            this.rows = rows;
            this.columns = columns;
            this.directions = directions;
        }

        public int getRows() {
            return rows;
        }

        public int getColumns() {
            return columns;
        }

        @Override
        public Direction getRoomDirections(int index) {
            return directions.get(index);
        }
    }

    // Missing code
    public interface DungeonController {
    }

    public class MazeGui extends JFrame {

        private final Board board;

        public MazeGui(Maze m) {
            this.setSize(600, 600);
            this.setResizable(false);

            this.board = new Board(m);
            JScrollPane scroller = new JScrollPane(board);
            this.add(scroller, BorderLayout.CENTER);

            setTitle("Dungeon Escape");
        }

        public Board getBoard() {
            return board;
        }

        public void addClickListener(DungeonController listener) {
            Board board = getBoard();
            board.addMouseMotionListener(new MouseAdapter() {
                @Override
                public void mouseMoved(MouseEvent e) {
                    board.highlightCellAt(e.getPoint());
                }
            });
        }

        private class Board extends JPanel {

            private Maze maze;
            private CellPane lastHighlightedCell = null;

            public Board(Maze maze) {
                this.maze = maze;
                setLayout(new GridBagLayout());
                GridBagConstraints gbc = new GridBagConstraints();
                gbc.gridx = 0;
                gbc.gridy = 0;

                for (int index = 0; index < maze.getRows() * maze.getColumns(); index  ) {
                    Maze.Direction direction = maze.getRoomDirections(index);
                    // Could use direction directly
                    CellPane cellPane = new CellPane(direction.getImage());
                    cellPane.setName(direction.name());
                    add(cellPane, gbc);
                    gbc.gridx  ;
                    if (gbc.gridx >= maze.getColumns()) {
                        gbc.gridx = 0;
                        gbc.gridy  ;
                    }
                }
            }

            public void highlightCellAt(Point p) {
                Component component = getComponentAt(p);
                if (component instanceof CellPane) {
                    CellPane cell = (CellPane) component;
                    cell.setHighlighted(true);
                    if (lastHighlightedCell != null && cell != lastHighlightedCell) {
                        lastHighlightedCell.setHighlighted(false);
                    }
                    lastHighlightedCell = cell;
                }
            }
        }
    }

    public class CellPane extends JPanel {

        private BufferedImage image;
        private boolean highlighted;

        public CellPane(BufferedImage image) {
            this.image = image;
        }

        @Override
        public Dimension getPreferredSize() {
            BufferedImage image = getImage();
            return image == null ? new Dimension(128, 128) : new Dimension(image.getWidth(), image.getHeight());
        }

        public boolean isHighlighted() {
            return highlighted;
        }

        public void setHighlighted(boolean highlighted) {
            this.highlighted = highlighted;
            repaint();
        }

        public BufferedImage getImage() {
            return image;
        }

        @Override
        protected void paintComponent(Graphics g) {
            super.paintComponent(g);
            Graphics2D g2d = (Graphics2D) g.create();
            g2d.drawImage(image, 0, 0, this);
            if (isHighlighted()) {
                g2d.setColor(new Color(0, 0, 255, 128));
                g2d.fillRect(0, 0, getWidth(), getHeight());
            }
            g2d.dispose();
        }

    }
}

另一種方法...

另一種方法可能會利用GridBagLayout. 您可以獲得用于布局給定組件的約束,然后重新使用它們將“覆寫”面板應用到同一位置。

This means you can keep the JLabel for displaying the maze direction and use a "overlay" component to provide different highlights

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Component;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Point;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.imageio.ImageIO;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;

public class Test {

    public static void main(String[] args) {
        new Test();
    }

    public Test() {
        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                List<Maze.Direction> directions = new ArrayList<>(32);
                directions.add(Maze.Direction.EAST_SOUTH);
                directions.add(Maze.Direction.EAST_SOUTH_WEST);
                directions.add(Maze.Direction.EAST_SOUTH_WEST);
                directions.add(Maze.Direction.EAST_SOUTH_WEST);
                directions.add(Maze.Direction.EAST_SOUTH_WEST);
                directions.add(Maze.Direction.SOUTH_WEST);
                directions.add(Maze.Direction.NORTH_EAST_SOUTH);
                directions.add(Maze.Direction.NORTH_EAST_SOUTH_WEST);
                directions.add(Maze.Direction.NORTH_EAST_SOUTH_WEST);
                directions.add(Maze.Direction.NORTH_EAST_SOUTH_WEST);
                directions.add(Maze.Direction.NORTH_EAST_SOUTH_WEST);
                directions.add(Maze.Direction.NORTH_SOUTH_WEST);
                directions.add(Maze.Direction.NORTH_SOUTH);
                directions.add(Maze.Direction.NORTH_SOUTH);
                directions.add(Maze.Direction.NORTH_SOUTH);
                directions.add(Maze.Direction.NORTH_SOUTH);
                directions.add(Maze.Direction.NORTH_SOUTH);
                directions.add(Maze.Direction.NORTH_SOUTH);
                directions.add(Maze.Direction.NORTH_SOUTH);
                directions.add(Maze.Direction.NORTH_SOUTH);
                directions.add(Maze.Direction.NORTH_SOUTH);
                directions.add(Maze.Direction.NORTH_SOUTH);
                directions.add(Maze.Direction.NORTH_SOUTH);
                directions.add(Maze.Direction.NORTH_SOUTH);
                directions.add(Maze.Direction.NORTH);
                directions.add(Maze.Direction.NORTH);
                directions.add(Maze.Direction.NORTH);
                directions.add(Maze.Direction.NORTH);
                directions.add(Maze.Direction.NORTH);
                directions.add(Maze.Direction.NORTH);

                System.out.println(directions.size());

                Maze maze = new DefaultMaze(5, 6, directions);

                MazeGui frame = new MazeGui(maze);
                frame.addClickListener(null);
                frame.setLocationRelativeTo(null);
                frame.setVisible(true);
            }
        });
    }

    public interface Maze {

        enum Direction {
            EAST_SOUTH("EastSouth.png"), EAST_SOUTH_WEST("EastSouthWest.png"), SOUTH_WEST("SouthWest.png"),
            NORTH_EAST_SOUTH("NorthEastSouth.png"), NORTH_EAST_SOUTH_WEST("NorthEastSouthWest.png"),
            NORTH_SOUTH_WEST("NorthSouthWest.png"), NORTH_SOUTH("NorthSouth.png"), NORTH("North.png");

            private BufferedImage image;

            private Direction(String name) {
                try {
                    image = ImageIO.read(getClass().getResource("/images/"   name));
                } catch (IOException ex) {
                    Logger.getLogger(Test.class.getName()).log(Level.SEVERE, null, ex);
                }
            }

            public BufferedImage getImage() {
                return image;
            }

        }

        public int getRows();

        public int getColumns();

        public Direction getRoomDirections(int index);
    }

    public class DefaultMaze implements Maze {

        int rows;
        int columns;

        private List<Direction> directions;

        public DefaultMaze(int rows, int columns, List<Direction> directions) {
            this.rows = rows;
            this.columns = columns;
            this.directions = directions;
        }

        public int getRows() {
            return rows;
        }

        public int getColumns() {
            return columns;
        }

        @Override
        public Direction getRoomDirections(int index) {
            return directions.get(index);
        }
    }

    // Missing code
    public interface DungeonController {
    }

    public class MazeGui extends JFrame {

        // Missing code
        public interface DungeonController {
        }

        private final Board board;

        public MazeGui(Maze m) {
            this.setSize(600, 600);
            this.setResizable(false);

            this.board = new Board(m);
            JScrollPane scroller = new JScrollPane(board);
            this.add(scroller, BorderLayout.CENTER);

            setTitle("Dungeon Escape");
        }

        public Board getBoard() {
            return board;
        }

        public void addClickListener(DungeonController listener) {
            Board board = getBoard();
            board.addMouseListener(new MouseAdapter() {
                @Override
                public void mouseClicked(MouseEvent e) {
                    board.highlightCellAt(e.getPoint());
                }
            });
        }

        private class Board extends JPanel {

            private Maze maze;
            private HighlighPane highlightPane = new HighlighPane();

            public Board(Maze maze) {
                this.maze = maze;
                setLayout(new GridBagLayout());
                GridBagConstraints gbc = new GridBagConstraints();
                gbc.gridx = 0;
                gbc.gridy = 0;

                for (int index = 0; index < maze.getRows() * maze.getColumns(); index  ) {
                    Maze.Direction direction = maze.getRoomDirections(index);
                    JLabel label = new JLabel(new ImageIcon(direction.getImage()));
                    label.setName(direction.name());
                    add(label, gbc);
                    gbc.gridx  ;
                    if (gbc.gridx >= maze.getColumns()) {
                        gbc.gridx = 0;
                        gbc.gridy  ;
                    }
                }
            }

            public void highlightCellAt(Point point) {
                Component component = getComponentAt(point);
                remove(highlightPane);
                if (component != null) {
                    GridBagLayout layout = (GridBagLayout) getLayout();
                    GridBagConstraints gbc = layout.getConstraints(component);
                    gbc.fill = gbc.BOTH;
                    add(highlightPane, gbc, 0);
                }
                revalidate();
                repaint(); 
            }
        }
    }

    public class HighlighPane extends JPanel {

        private Color highlight = new Color(0, 0, 255, 128);

        public HighlighPane() {
            setOpaque(false);
        }

        @Override
        protected void paintComponent(Graphics g) {
            super.paintComponent(g);
            Graphics2D g2d = (Graphics2D) g.create();
            g2d.setColor(highlight);
            g2d.fillRect(0, 0, getWidth(), getHeight());
            g2d.dispose();
        }

    }
}

Modification of "MCVE"

The is, yet, another modification of your code. This highlights to me that you've not taken the time to read through Performing Custom Painting, especially A Closer Look at the Paint Mechanism, which highlights the order in which paint methods are chained together.

Basically paint

  • paintComponent
  • paintBorder
  • paintChildren

What's important to note here is, paintComponent is called FIRST, before any child components are painted. You also need to beware that it's entirely possible for a child component to under go a paint pass without the parent component been involved.

Sooo, when designing "highlight" or "overlay" solutions, you need to keep this is mind, which is why the first suggestion was to do away with JLabel and do it all yourself.

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.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Image;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import javax.imageio.ImageIO;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import stackoverflow.Test.ReadOnlyModel;

public class Test {

    public static void main(String[] args) {
        new Test();
    }

    public Test() {
        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {

                List<List<String>> directions = new ArrayList<>(32);

                List<String> row = new ArrayList<>();
                row.add("EastSouth");
                row.add("EastSouthWest");
                row.add("EastSouthWest");
                row.add("EastSouthWest");
                row.add("EastSouthWest");
                row.add("SouthWest");
                directions.add(row);

                row = new ArrayList<>();
                row.add("NorthEastSouth");
                row.add("NorthEastSouthWest");
                row.add("NorthEastSouthWest");
                row.add("NorthEastSouthWest");
                row.add("NorthEastSouthWest");
                row.add("NorthSouthWest");
                directions.add(row);

                row = new ArrayList<>();
                row.add("NorthSouth");
                row.add("NorthSouth");
                row.add("NorthSouth");
                row.add("NorthSouth");
                row.add("NorthSouth");
                row.add("NorthSouth");
                directions.add(row);

                row = new ArrayList<>();
                row.add("NorthSouth");
                row.add("NorthSouth");
                row.add("NorthSouth");
                row.add("NorthSouth");
                row.add("NorthSouth");
                row.add("NorthSouth");
                directions.add(row);

                row = new ArrayList<>();
                row.add("North");
                row.add("North");
                row.add("North");
                row.add("North");
                row.add("North");
                row.add("North");
                directions.add(row);

                System.out.println(directions.size());

                DefaultModel maze = new DefaultModel(5, 6, directions);

                TestGUI frame = new TestGUI(maze);
                frame.setLocationRelativeTo(null);
                frame.setVisible(true);
            }
        });
    }

    public interface ReadOnlyModel {

        public int getRows();

        public int getColumns();

        public String getDirectionAt(int row, int column);

        public Image getImageFor(String direction);
    }

    public class DefaultModel implements ReadOnlyModel {

        int rows;
        int columns;

        private List<List<String>> directions;

        public DefaultModel(int rows, int columns, List<List<String>> directions) {
            this.rows = rows;
            this.columns = columns;
            this.directions = directions;
        }

        public int getRows() {
            return rows;
        }

        public int getColumns() {
            return columns;
        }

        @Override
        public String getDirectionAt(int row, int column) {
            return directions.get(row).get(column);
        }

        @Override
        public Image getImageFor(String direction) {
            try {
                return ImageIO.read(getClass().getResource(String.format("/images/%s.png", direction)));
            } catch (IOException ex) {
                System.out.println(direction);
                ex.printStackTrace();
            }
            return null;
        }

    }

    public class TestGUI extends JFrame {

        private final Board board;

        public TestGUI(ReadOnlyModel m) {

            this.setSize(600, 600);
            this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
            this.setResizable(false);

            this.board = new Board(m);
            JScrollPane scroller = new JScrollPane(board);
            this.add(scroller, BorderLayout.CENTER);
        }

        private class Board extends JPanel {

            public Board(ReadOnlyModel m) {

                setLayout(new GridBagLayout());
                GridBagConstraints gbc = new GridBagConstraints();
                gbc.gridx = 0;
                gbc.gridy = 0;

                int counter = 0;
                for (int row = 0; row < m.getRows(); row  ) {
                    for (int col = 0; col < m.getColumns(); col  ) {
                        String direction = m.getDirectionAt(row, col);
                        Image image = m.getImageFor(direction);
                        Tile tile = new Tile(direction, image);
                        add(tile, gbc);
                        gbc.gridx  ;
                        counter  ;
                        if (counter % 2 == 0) {
                            tile.setHighlighted(true);
                        }
                    }
                    counter  ;
                    gbc.gridx = 0;
                    gbc.gridy  ;
                }

            }

            private class Tile extends JPanel {

                private String direction;
                private Color highlight = new Color(0, 0, 255, 128);
                private Image image;

                private boolean highlighted = false;

                public Tile(String direction, Image image) {
                    this.direction = direction;
                    setName(direction);
                    setOpaque(false);
                    this.image = image;
                }

                @Override
                public Dimension getPreferredSize() {
                    Image image = getImage();
                    return image == null ? new Dimension(128, 128) : new Dimension(image.getWidth(this), image.getHeight(this));
                }

                public void setHighlighted(boolean highlighted) {
                    this.highlighted = highlighted;
                }

                public boolean isHighlighted() {
                    return highlighted;
                }

                public Image getImage() {
                    return image;
                }

                public Color getHighlight() {
                    return highlight;
                }

                @Override
                public void paintComponent(Graphics g) {
                    super.paintComponent(g);
                    Graphics2D g2d = (Graphics2D) g.create();

                    Image image = getImage();
                    if (image != null) {
                        g2d.drawImage(image, 0, 0, this);
                    }

                    if (isHighlighted()) {
                        g2d.setColor(highlight);
                        g2d.fillRect(0, 0, getWidth(), getHeight());
                    }
                    g2d.dispose();
                }

            }

//            @Override
//            public void refresh() {
//
//                this.repaint();
//            }
//
//            @Override
//            public void makeVisible() {
//
//                this.setVisible(true);
//
//            }
        }
    }
}

uj5u.com熱心網友回復:

我想到了!關鍵是將突出顯示代碼(和邏輯)放在 getImage 方法中,在該方法中影像繪制在圖形上。

這是代碼。檢查 getImage 方法:

public class testGui extends JFrame {
  
  private final Board board;
  
  public testGui() {
    
    this.setSize(600, 600);
    this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    this.setResizable(false);

    this.board = new Board();
    JScrollPane scroller = new JScrollPane(board);
    this.add(scroller, BorderLayout.CENTER);
  }
  

  public ImageIcon getImage(int i) {
    

    try {
      
      BufferedImage imageBase = ImageIO.read(getClass().getResource(String.format("/images/test%d.png", i)));
      
      int width = imageBase.getWidth();
      int height = imageBase.getHeight();
      
      BufferedImage combined = new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB);
      Graphics g1 = combined.getGraphics();

      Graphics2D g = (Graphics2D) g1.create();
      g.drawImage(imageBase, 0, 0, null);

      if (i ==2) {

        g.setColor(new Color(0, 0, 255, 128));
        g.fillRect(0, 0, getWidth(), getHeight());
        g.dispose();


    }
        
        ImageIcon icon = new ImageIcon(combined);
        return icon;

       
  } catch (IOException ex) {
      Logger.getLogger(DungeonGui.class.getName()).log(Level.SEVERE, null, ex);

  }

   return null; 
  }
  
  private class Board extends JPanel {

    public Board() {

      setLayout(new GridBagLayout());
      GridBagConstraints gbc = new GridBagConstraints();
      gbc.gridx = 0;
      gbc.gridy = 0;
      

      for (int i = 0; i < 3; i  ) {
        
        Tile tile = new Tile(i);
        
        cellPanel.setName(String.format("%d", i));
        add(tile, gbc);
        gbc.gridx  ;
        if (gbc.gridx >= 3) {
            gbc.gridx = 0;
            gbc.gridy  ;
        }

    }
    
    
   
  }
  

  private class Tile extends JPanel  {
    

    private int i;
    private JLabel label;
    
    public CellPanel(int i) {
      super();
      this.i = i;
      
      this.setLayout(new GridLayout(1, 1));
      
      ImageIcon imageIcon = getImage(i);
      
      this.label = new JLabel(imageIcon);
      this.add(label);
      
    }

    @Override
    public void paintComponent(Graphics g) {
      
      super.paintComponent(g);
      
      ImageIcon imageIcon = getImage(i);
      
      this.label.setIcon(imageIcon);

    }
    
  }
  
  @Override
  public void refresh() {
    
    this.repaint();
  }

  @Override
  public void makeVisible() {

    this.setVisible(true);
    
  }

}



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