首先，我想说我明白我问了很多，所以任何帮助都会受到赞赏，我感谢你的时间。我非常感激。
无论如何，我正在为我的A2课程创建一个游戏，通常称为Checkers。我已经完成了我的代码，一切都按照我的计划进行，除了CheckerBoard本身以及checkerpieces似乎没有显示。
我的董事会应该出现的部分只是一个黑色的空间。虽然我的电路板似乎没有显示，但我在其上执行的所有操作（例如单击某个部分）都会产生计划的响应，虽然我已经检查了我的代码，但我无法弄清楚我做错了什么。
无论如何，如果有人可能发现我的错误或者给我一些建议，我将非常感激。谢谢
public class CheckerBoard extends JPanel implements ActionListener, MouseListener {
// Main routine that opens an Applet that shows a CheckerBoard
public static void main(String[] args) {
JFrame application = new JFrame("Checkers"); // Sets the title at the top of the application as 'Checkers'
JMenuBar bar = new JMenuBar(); // Adds the Menu Bar
JMenu fileMenu = new JMenu("File"); // Adds a File Tab to the Menu Bar
JMenu helpMenu = new JMenu("Help"); // Adds a Help Tab to the Menu Bar
JMenuItem exit = new JMenuItem("Exit"); // Adds the Exit sub-tab as an Item of the JMenu
JMenuItem mainMenu = new JMenuItem("Main Menu"); // Adds the Main Menu sub-tab as an Item of the JMenu
final JMenuItem Rules = new JMenuItem("Rules"); // Adds the Rules of Checkers sub-tab as an Item of the JMenu
helpMenu.add(Rules); // Adds the Rules of Checkers tab into the Help tab
fileMenu.add(mainMenu);// Adds the Main Menu sub-tab into the File tab
fileMenu.addSeparator(); // Adds a line in between the Main Menu sub-tab and the Exit sub-tab
fileMenu.add(exit); // Adds the Exit sub-tab into the Menu tab
bar.add(fileMenu); // Adds the Menu tab to the Menu bar
bar.add(helpMenu); // Adds the Help tab to the Menu Bar
application.setJMenuBar(bar); // Adds the Menu Bar to the application window
Rules.addActionListener(new ActionListener() // Adds a new ActionListener to the Rules sub-tab
{
public void actionPerformed(ActionEvent ev)
{
JOptionPane.showMessageDialog(Rules,
"- Pieces must always move diagonally\n" +
"- Single pieces are limited to forward moves\n" +
"- Kings may move both forward and backward\n" +
"- When a piece is captured, it is removed from the board\n" +
"- If a player is able to make a capture, there is no option, the jump must be made\n" +
"- When a piece reaches the opponents end of the board, it is crowned and becomes a King",
"Rules for Checkers",
JOptionPane.PLAIN_MESSAGE);
}
}); //This has added a JOptionPane action when my Rules sub-tab is clicked, this displays the message dialog of the JOptionPane which can be seen
exit.addActionListener(new ActionListener() // Adds an ActionListener to the Exit Sub-tab
{
public void actionPerformed(ActionEvent ev)
{
System.exit(0); // This means that when the Exit sub-tab is clicked, it will exit the application
}
});
CheckerBoard content = new CheckerBoard(); // Sets the CheckerBoard values into the content to be used in the next line
application.setContentPane(content); // Container holds the values together, Content pane of the CheckerBoard
application.pack(); // Use preferred size of content to set size of application.
Dimension screensize = Toolkit.getDefaultToolkit().getScreenSize();
application.setLocation( (screensize.width - application.getWidth())/2,
(screensize.height - application.getHeight())/2 );
application.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE ); // Sets so that the application can be exited when the application is closed
application.setResizable(false); // This makes it so that the user can't change the application's size.
application.setVisible(true); // Sets it so that the application can actually be seen
}
private JButton NewGameButton; // Button for starting a new game.
private JButton ResignButton; // Button that a player can use to end the game by resigning
private JLabel MessageDisplay; // Label for displaying messages to the user.
public CheckerBoard() {
// This is going to be a constructor, this constructor will set the layout manager for the panel to be null, it will then add components to the panel
// and it will set their bounds.
setLayout(null); // So that it will match my requirement specification, I will do the layout myself
setBackground(new Color(0,120,0)); // Dark Green Background colour.
setPreferredSize(new Dimension(350,250)); // The size of the Panel
BoardComplete checkerboardData = new BoardComplete();
add(checkerboardData); // This will create the components and add them to the content pane
add(NewGameButton);
add(ResignButton);
add(MessageDisplay);
// I will now have to produce a method to set the position and size of each component by calling its setBounds() method
checkerboardData.setBounds(20,20,164,164); // Sets the board dimensions
NewGameButton.setBounds(210, 60, 120, 30);
ResignButton.setBounds(210, 120, 120, 30);
MessageDisplay.setBounds(20, 200, 350, 30);
}
public class BoardComplete extends JPanel implements ActionListener, MouseListener {
DataForCheckers checkerboardData; // This is where the data for the checkerboard is going to be kept, this board will be responsible for the
// generating of the lists of the legal moves then I will define at a later stage.
boolean CheckerMatchInProgress; // In some of the actions I will be creating, I will have to check whether a game is in progress
// therefore this is a boolean value as it is either true or false, only two possible outcomes.
// The next three variables as seen below will only be valid when the game is in progress
int ChosenRow, ChosenColumn; // If the current player has selected a piece to
// move, these give the row and column
// containing that piece. If no piece is
// yet selected, then ChosenRow is -1.
int ChosenPlayer; // This will check which user turn it is, there will be two possible values which will include DataForCheckers.RED and Checkers.Data.BLACK
DataForMoves[] LegalMoves; // An array containing the legal moves for the
// current player.
// The constructor will create the buttons and the labels. It will
// listen for mouse clicks and for clicks on the buttons. It will create
// the board and start the first game.
BoardComplete() {
setBackground(Color.BLACK);
addMouseListener(this);
ResignButton = new JButton("Resign");
ResignButton.addActionListener(this);
NewGameButton = new JButton("New Game");
NewGameButton.addActionListener(this);
MessageDisplay = new JLabel("",JLabel.CENTER);
MessageDisplay.setFont(new Font("Serif", Font.BOLD, 14));
MessageDisplay.setForeground(Color.green);
checkerboardData = new DataForCheckers();
}
// Now I will have to draw the checkerboard pattern in Gray and LightGray
// Just like with my CheckerBoard Class, this will draw the checkers, and if
// a game is in progress, it will highlight the legal moves that the user can make.
public void PaintCheckerBoard(Graphics g) {
Graphics2D g2 = (Graphics2D)g;
g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
// This will draw a two-pixel black border around the edges of the canvas.
g.setColor(Color.black);
g.drawRect(0,0,getSize().width-1,getSize().height-1);
g.drawRect(1,1,getSize().width-3,getSize().height-3);
// Draw the squares of the checkerboard and the checkers.
for (int row = 0; row < 8; row++) {
for (int col = 0; col < 8; col++) {
if ( row % 2 == col % 2 )
g.setColor(Color.LIGHT_GRAY);
else
g.setColor(Color.GRAY);
g.fillRect(2 + col*20, 2 + row*20, 20, 20);
switch (checkerboardData.PieceLocation(row,col)) {
case DataForCheckers.RED:
g.setColor(Color.RED);
g.fillOval(4 + col*20, 4 + row*20, 15, 15);
break;
case DataForCheckers.BLACK:
g.setColor(Color.BLACK);
g.fillOval(4 + col*20, 4 + row*20, 15, 15);
break;
case DataForCheckers.RED_KING:
g.setColor(Color.RED);
g.fillOval(4 + col*20, 4 + row*20, 15, 15);
g.setColor(Color.WHITE);
g.drawString("K", 7 + col*20, 16 + row*20);
break;
case DataForCheckers.BLACK_KING:
g.setColor(Color.BLACK);
g.fillOval(4 + col*20, 4 + row*20, 15, 15);
g.setColor(Color.WHITE);
g.drawString("K", 7 + col*20, 16 + row*20);
break;
}
}
}
} // end PaintCheckerBoard()
我知道这有很多要问，但任何帮助都会非常感激，我将非常感激。非常感谢你
答案 0 :(得分：2)
基本上，没有任何内容可以调用您的PaintCheckerBoard方法。
检查Painting in AWT and Swing和Performing Custom Painting，了解有关绘画如何在Swing中工作的更多详细信息。
基本上，您需要覆盖BoardComplete＆＃39; paintComponent并从中执行自定义绘画
话虽如此，使用GridLayout
避免使用null布局，像素完美布局是现代ui设计中的一种幻觉。影响组件个体大小的因素太多，您无法控制。 Swing旨在与布局管理器一起工作，放弃这些将导致问题和问题的终结，您将花费越来越多的时间来纠正