如何在棋盘游戏中移动跳棋？ [英] How to moving checkers pieces in board game?
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问题描述
我已经使用Java创建了一个跳棋游戏界面，并将棋子放置在游戏板上的每个位置，但是现在我无法将棋子从一个正方形移到另一个正方形。
如何在棋盘游戏中移动跳棋？
下面是我尝试过的源代码：
/ *
*要更改此许可证标头，请选择许可证标头在项目属性中。
*要更改此模板文件，请选择工具 |工具。模板
*并在编辑器中打开模板。
* /
软件包chackergame;
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.GridLayout;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.SwingConstants;
/ **
*
* @author wenda
* /
公共课程CheckerGame扩展了JFrame {
private final int ROWS = 8;
private final int COLL = 8;
私人最终JPanel [] []正方形=新的JPanel [8] [8];
私人JPanel backgroundPanel;
私人最终JLabel statusBar = new JLabel（ Red turn to play）；
private JLabel lbPieces = new JLabel（）;
私有布尔值inDrag = false;
public CheckerGame（）{
//将棋盘添加到分层窗格中
backgroundPanel = new JPanel（）;
backgroundPanel.setLayout（new GridLayout（8，8，0，0））;
add（backgroundPanel，BorderLayout.CENTER）;
add（statusBar，BorderLayout.SOUTH）;
createSquare（）;
addPieces（）;
setIconImage（PiecesIcon.iconGame.getImage（））;
setTitle（ Java Checkers）； //设置标题游戏
setSize（500，500）;
// setResizable（false）;
setLocationRelativeTo（null）;
setLocationByPlatform（true）;
setDefaultCloseOperation（JFrame.EXIT_ON_CLOSE）;
setVisible（true）;
}
public void createSquare（）{
for（int row = 0; row< ROWS; row ++）{
for（int col = 0; col< COLL; col ++）{
JPanel单元格=新的JPanel（）;
if（（row + col）％2 == 1）{
cell.setBackground（new Color（99，164，54））;
// cell.setBackground（Color.BLACK）;
}
if（（row + col）％2 == 0）{
cell.setBackground（new Color（247，235，164））;
// cell.setBackground（Color.WHITE）;
}
square [row] [col] =单元格；
backgroundPanel.add（square [row] [col]）;
}
}
}
/ **
*在面板上添加块
* /
private void addPieces（ ）{
for（int row = 0; row< ROWS; row ++）{
for（int col = 0; col< COLL; col ++）{
lbPieces =新的JLabel（）;
lbPieces.setHorizontalAlignment（SwingConstants.CENTER）;
//lb.setBorder(BorderFactory.createLineBorder(Color.LIGHT_GRAY，1））;
if（（row + col）％2 == 1）{
if（row< 3）{
lbPieces.setIcon（PiecesIcon.redPiece）;
} else if（第4行）{
lbPieces.setIcon（PiecesIcon.whitePiece）;
}
}
square [row] [col] .setLayout（new BorderLayout（））;
square [row] [col] .add（lbPieces，BorderLayout.CENTER）;
} // for col循环的结束
} // for行循环的结束
} // addPieces方法的结束
公共类MouseInput扩展MouseAdapter {
@Override
public void mousePressed（MouseEvent evt）{
}
@ Override
public void mouseReleased（MouseEvent evt ）{
}
@Override
public void mouseClicked（MouseEvent evt）{
}
@Override
public void mouseDragged（MouseEvent evt）{
}
}
/ **
* @param args命令行参数
* /
public static void main（String [] args）{
new CheckerGame（）;
}
}
解决方案
基本问题是要从任何源容器（ JPanel JLable ） >）到其他任何一个。
每个此类容器都可以是拖动组件的来源或放置对象。因此它需要同时支持两者。此类 JPanel 在以下 DragDropPane 类中实现。
要编写此代码，我是从
I have created a checkers game interface using java and placed pieces in each position on the game board but at the moment I am having trouble moving the pieces from one square to another.
How to moving checkers pieces in board game? Below is source code that I've tried:
/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
package chackergame;
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.GridLayout;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.SwingConstants;
/**
*
* @author wenda
*/
public class CheckerGame extends JFrame {
private final int ROWS = 8;
private final int COLL = 8;
private final JPanel[][] square = new JPanel[8][8];
private JPanel backgroundPanel;
private final JLabel statusBar = new JLabel(" Red turn to play");
private JLabel lbPieces = new JLabel();
private boolean inDrag = false;
public CheckerGame() {
//Add a chess board to the Layered Pane
backgroundPanel = new JPanel();
backgroundPanel.setLayout(new GridLayout(8, 8, 0, 0));
add(backgroundPanel, BorderLayout.CENTER);
add(statusBar, BorderLayout.SOUTH);
createSquare();
addPieces();
setIconImage(PiecesIcon.iconGame.getImage());
setTitle("Java Checkers");// set title game
setSize(500, 500);
//setResizable(false);
setLocationRelativeTo(null);
setLocationByPlatform(true);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setVisible(true);
}
public void createSquare() {
for (int row = 0; row < ROWS; row++) {
for (int col = 0; col < COLL; col++) {
JPanel cell = new JPanel();
if ((row + col) % 2 == 1) {
cell.setBackground(new Color(99, 164, 54));
// cell.setBackground(Color.BLACK);
}
if ((row + col) % 2 == 0) {
cell.setBackground(new Color(247, 235, 164));
// cell.setBackground(Color.WHITE);
}
square[row][col] = cell;
backgroundPanel.add(square[row][col]);
}
}
}
/**
* Add pieces to the board
*/
private void addPieces() {
for (int row = 0; row < ROWS; row++) {
for (int col = 0; col < COLL; col++) {
lbPieces = new JLabel();
lbPieces.setHorizontalAlignment(SwingConstants.CENTER);
//lb.setBorder(BorderFactory.createLineBorder(Color.LIGHT_GRAY, 1));
if ((row + col) % 2 == 1) {
if (row < 3) {
lbPieces.setIcon(PiecesIcon.redPiece);
} else if (row > 4) {
lbPieces.setIcon(PiecesIcon.whitePiece);
}
}
square[row][col].setLayout(new BorderLayout());
square[row][col].add(lbPieces, BorderLayout.CENTER);
} // end of for col loop
} // end of for row loop
} // end of addPieces method
public class MouseInput extends MouseAdapter {
@Override
public void mousePressed(MouseEvent evt) {
}
@Override
public void mouseReleased(MouseEvent evt) {
}
@Override
public void mouseClicked(MouseEvent evt) {
}
@Override
public void mouseDragged(MouseEvent evt) {
}
}
/**
* @param args the command line arguments
*/
public static void main(String[] args) {
new CheckerGame();
}
}
解决方案
The basic question is about dragging a component (in this case a JLable) from any source container (a JPanel) to any other one.
Every such container can be a source of the dragged component or a drop-target for it. so it needs to support both. Such JPanel is implemented in the following DragDropPane class.
To write this code I borrowed from MadProgrammer's answer which shows a solution for one source and one target.
It is a one-file mre : the entire code can be copy-pasted to LabelDnD.java file, and run. It demonstrates dragging a JLabel from panel to panel. Please note the comments:
import java.awt.Color;
import java.awt.Component;
import java.awt.Cursor;
import java.awt.Dimension;
import java.awt.GridLayout;
import java.awt.datatransfer.DataFlavor;
import java.awt.datatransfer.Transferable;
import java.awt.datatransfer.UnsupportedFlavorException;
import java.awt.dnd.DnDConstants;
import java.awt.dnd.DragGestureEvent;
import java.awt.dnd.DragGestureListener;
import java.awt.dnd.DragSource;
import java.awt.dnd.DragSourceDragEvent;
import java.awt.dnd.DragSourceDropEvent;
import java.awt.dnd.DragSourceEvent;
import java.awt.dnd.DragSourceListener;
import java.awt.dnd.DropTarget;
import java.awt.dnd.DropTargetAdapter;
import java.awt.dnd.DropTargetDropEvent;
import javax.swing.BorderFactory;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;
public class LabelDnD{
private static final int ROWS = 5, COLS = 5, GAP = 4;
private Component makeContent() {
JPanel content = new JPanel(new GridLayout(ROWS,COLS, GAP,GAP));
content.setBorder(BorderFactory.createLineBorder(content.getBackground(), GAP));
for(int i = 0; i < ROWS*COLS ; i++){
content.add(new DragDropPane(String.valueOf(i)));
}
return content;
}
public static void main(String[] args) {
SwingUtilities.invokeLater(() -> {
JFrame f = new JFrame("Label Drag & Drop");
f.add(new LabelDnD().makeContent());
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.setLocationRelativeTo(null);
f.pack();
f.setVisible(true);
});
}
}
class DragDropPane extends JPanel implements DragGestureListener, DragSourceListener {
private static final int W = 50, H = 50;
private JComponent dragable;
public DragDropPane(String text) {
setBackground(Color.white);
setPreferredSize(new Dimension(W, H));
setBorder(BorderFactory.createLineBorder(Color.blue, 1));
var label = new JLabel(text, JLabel.CENTER);
setContent(label);
new MyDropTargetListener(this);
DragSource.getDefaultDragSource().createDefaultDragGestureRecognizer(
this, DnDConstants.ACTION_COPY, this);
}
@Override
public Dimension getPreferredSize() {
return new Dimension(W, H);
}
public void setContent(JComponent component) {
removeAll();
dragable = component;
add(component);
repaint();
}
//-->DragGestureListener implementation
@Override
public void dragGestureRecognized(DragGestureEvent dge) {
// Create our transferable wrapper
Transferable transferable = new TransferableComponent(dragable);
// Start the "drag" process...
DragSource ds = dge.getDragSource();
ds.startDrag(dge, Cursor.getPredefinedCursor(Cursor.MOVE_CURSOR), transferable, this);
remove(dragable);
revalidate(); repaint();
}
//-->DragSourceListener implementation
@Override
public void dragEnter(DragSourceDragEvent dsde) {}
@Override
public void dragOver(DragSourceDragEvent dsde) {}
@Override
public void dropActionChanged(DragSourceDragEvent dsde) {}
@Override
public void dragExit(DragSourceEvent dse) {}
@Override
public void dragDropEnd(DragSourceDropEvent dsde) {
// If the drop was not successful, we need to
// return the component back to it's previous
// parent
if (!dsde.getDropSuccess()) {
setContent(dragable);
}
}
}
class MyDropTargetListener extends DropTargetAdapter {
private final DragDropPane target;
public MyDropTargetListener(DragDropPane target) {
this.target = target;
new DropTarget(target, DnDConstants.ACTION_COPY, this, true, null);
}
@Override
public void drop(DropTargetDropEvent event) {
try {
var tr = event.getTransferable();
var component = (JComponent) tr.getTransferData(TransferableComponent.component);
if (event.isDataFlavorSupported(TransferableComponent.component)) {
event.acceptDrop(DnDConstants.ACTION_COPY);
target.setContent(component);
event.dropComplete(true);
} else {
event.rejectDrop();
}
} catch (Exception e) {
e.printStackTrace();
event.rejectDrop();
}
}
}
class TransferableComponent implements Transferable {
protected static final DataFlavor component =
new DataFlavor(JComponent.class, "A Component");
protected static final DataFlavor[] supportedFlavors = {
component
};
private final JComponent componentToTransfer;
public TransferableComponent(JComponent componentToTransfer) {
this.componentToTransfer = componentToTransfer;
}
@Override
public DataFlavor[] getTransferDataFlavors() {
return supportedFlavors;
}
@Override
public boolean isDataFlavorSupported(DataFlavor flavor) {
return flavor.equals(component);
}
@Override
public Object getTransferData(DataFlavor flavor) throws UnsupportedFlavorException {
if (flavor.equals(component)) return componentToTransfer;
else throw new UnsupportedFlavorException(flavor);
}
}
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