我制作了一个俄罗斯方 block 游戏。现在，我已经使用 JPanel 来显示内容和 block (使用 paintComponents() 方法)。
问题是每当我尝试从另一个 JFrame 调用俄罗斯方 block 程序时它根本不绘制。
我的俄罗斯方 block 主菜单的代码是:
import javax.swing.*;
import sun.audio.AudioPlayer;
import sun.audio.AudioStream;
import java.awt.*;
import java.awt.event.*;
import java.io.FileInputStream;
import java.io.InputStream;
@SuppressWarnings("serial")
public class Tetris_MainMenu extends JFrame implements ActionListener {
@SuppressWarnings("unused")
public static void main(String[] args) {
Tetris_MainMenu tmm = new Tetris_MainMenu();
playAudio("doak.wav");
}
JPanel logo = new JPanel();
JPanel buttonPanel = new JPanel(new GridLayout(4, 1));
JButton start = new JButton("START NEW GAME");
JButton help = new JButton("INSTRUCTIONS");
JButton about = new JButton("ABOUT THIS GAME");
JButton exit = new JButton("EXIT");
Tetris_MainMenu(){
setTitle("JAG's TETRIS");
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setLocation(300, 100);
setSize(200, 400);
setEnabled(true);
setFocusable(true);
setVisible(true);
//adding a logo to the logo panel
//adding buttons to the buttonPanel
buttonPanel.add(start);
buttonPanel.add(help);
buttonPanel.add(about);
buttonPanel.add(exit);
//add panels to window
setLayout(new GridLayout(2, 1));
add(logo);
add(buttonPanel);
//make buttons listen to actions
start.addActionListener(this);
help.addActionListener(this);
about.addActionListener(this);
exit.addActionListener(this);
}
@SuppressWarnings("restriction")
public static void playAudio(String filename)
{
InputStream in = null;
AudioStream as = null;
try{
in = new FileInputStream(filename);
as = new AudioStream(in);
}
catch(Exception e){
System.out.println("Error!!!");
}
AudioPlayer.player.start(as);
}
@Override
public void actionPerformed(ActionEvent e) {
if(e.getSource() == start){
this.dispose();
MatrixBoard b = new MatrixBoard();
b.setRequestFocusEnabled(true);
}
else if(e.getSource() == help){
JOptionPane.showMessageDialog(null, "Controls:\n"
+ "LEFT and RIGHT ARROWS: For moving blocks left and right\n"
+ "DOWN ARROW: For dropping block immediately\n"
+ "SPACEBAR: For rotating block\n"
+ "e: To exit to main menu");
}
else if(e.getSource() == about){
JOptionPane.showMessageDialog(null, "Designed by: JAG."
+ "\nIf you want you can use it for your own purposes."
+ "\nBut give credit where it is due.");
}
else if(e.getSource() == exit){
int opt = JOptionPane.showConfirmDialog(null, "Are you sure?", "Confirm Exit", JOptionPane.YES_NO_OPTION);
if(opt == JOptionPane.YES_OPTION){
System.exit(0);
}
}
}
}
当调用 MatrixBoard 的构造函数时，俄罗斯方 block 游戏在新窗口中开始。但是，这些 block 在屏幕上是不可见的。 MatrixBoard 的代码是:
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.io.*;
import sun.audio.*;
@SuppressWarnings("serial")
public class MatrixBoard extends JPanel implements ActionListener{
int boardHeight = 20;
int boardWidth = 10;
int score = 0;
int curX = 0, curY = 0;
int squareWidth;
int squareHeight;
Timer timer;
int sleepTime = 300;
Shape curPiece;
Shape.Tetromino[][] board;
boolean isFallingFinished = false;
boolean isStarted = false;
boolean isPaused = false;
JFrame f;
@SuppressWarnings("unused")
public static void main(String [] args){
MatrixBoard b = new MatrixBoard();
}
public void update(Graphics g) {
Graphics offgc;
Image offscreen = null;
Dimension d = getSize();
// create the offscreen buffer and associated Graphics
offscreen = createImage(d.width, d.height);
offgc = offscreen.getGraphics();
// clear the exposed area
offgc.setColor(getBackground());
offgc.fillRect(0, 0, d.width, d.height);
offgc.setColor(getForeground());
// do normal redraw
paint(offgc);
// transfer offscreen to window
g.drawImage(offscreen, 0, 0, this);
}
@SuppressWarnings("restriction")
public static void playAudio(String filename)
{
InputStream in = null;
AudioStream as = null;
try{
in = new FileInputStream(filename);
as = new AudioStream(in);
}
catch(Exception e){
System.out.println("Error!!!");
}
AudioPlayer.player.start(as);
}
MatrixBoard(){
f = new JFrame("JAG's TETRIS");
f.setVisible(true);
f.setSize(205, 400);
f.setFocusable(true);
f.setBackground(Color.GREEN);
f.add(this);
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setSize(200, 400);
setVisible(true);
setFocusable(true);
requestFocusInWindow();
setBackground(Color.BLACK);
timer = new Timer(400, this);
timer.setInitialDelay(10);
squareWidth = (getWidth())/ boardWidth;
squareHeight = (getHeight()) / boardHeight;
curPiece = new Shape();
board = new Shape.Tetromino[boardWidth][boardHeight];
addKeyListener(new KeyHandler());
clearBoard();
timer.start();
JOptionPane.showMessageDialog(null, "Press Enter to Start!!!");
f.setEnabled(true);
f.setResizable(false);
//setEnabled(true);
start();
System.out.println("MatrixBoard() Success!");
}
public void clearBoard(){
for(int i = 0; i < boardWidth; ++i)
for(int j = 0; j < boardHeight; ++j)
board[i][j] = Shape.Tetromino.NoShape;
}
public void start()
{
if (isPaused)
return;
clearBoard();
timer.start();
timer = new Timer(400, this);
timer.setInitialDelay(100);
isStarted = true;
isFallingFinished = false;
score = 0;
repaint();
newPiece();
System.out.println("START SUCCESS!");
}
private void newPiece(){
if(!isStarted) return;
curPiece.generateShape();
curX = boardWidth / 2;
curY = 1;
if(!tryMove(curPiece, curX, curY)){
curPiece.selectPiece(Shape.Tetromino.NoShape);
isStarted = false;
JOptionPane.showMessageDialog(null, "Game Over! Score : " + score);
isStarted = false;
int opt = JOptionPane.showConfirmDialog(null, "Try Again?", "Again?", JOptionPane.YES_NO_OPTION);
if(opt == JOptionPane.YES_OPTION){
start();
}
else if (opt == JOptionPane.NO_OPTION){
System.exit(0);
}
//dispose();
System.exit(0);
//new Tetris();
return;
}
dropDown();
System.out.println("NEW PIECE SUCCESS!");
}
private boolean tryMove(Shape newPiece, int newX, int newY){
for(int i = 0; i < 4; i++){
int x = newX + newPiece.coords[i][0];
int y = newY + newPiece.coords[i][1];
if(x < 0 || x >= boardWidth || y < 0 || y >= boardHeight){
System.out.println("FALSE1");
return false;
}
if(board[x][y] != Shape.Tetromino.NoShape){
System.out.println("FALSE2");
return false;
}
}
curPiece = newPiece;
curX = newX;
curY = newY;
System.out.println("curX = " + curX + " curY = " + curY);
System.out.println("TRY MOVE SUCCESS!");
return true;
}
private void dropDown(){
int newY = curY;
sleepTime = 300;
System.out.println("newY = " + newY);
while(newY < boardHeight){
if(!tryMove(curPiece, curX, newY+1)){ break;}
++newY;
System.out.println("calling f.update()");
repaint();
System.out.println("called f.update()");
try {
Thread.sleep(sleepTime);
} catch (Exception e) {
e.printStackTrace();
}
}
pieceDropped();
System.out.println("DROPDOWN SUCCESS!");
}
private void pieceDropped(){
for(int i = 0; i < 4; i++){
int x = curX + curPiece.coords[i][0];
int y = curY + curPiece.coords[i][1];
board[x][y] = curPiece.retShape();
System.out.println("PIECE: at X = " + x + " Y = " + y + "is " + curPiece.retShape().ordinal());
}
removeFullLines();
if(!isFallingFinished) newPiece();
System.out.println("PIECE DROPPED SUCCESS!");
}
public void paintComponent(Graphics g){
System.out.println("PAINTED\n\n\n\n\nPAINTED!!!!");
super.paintComponent(g);
Dimension size = getSize();
int boardTop = (int) size.getHeight() - boardHeight * squareHeight;
System.out.println("PAINTED\n\n\n\n\nPAINTED!!!!");
for (int i = 0; i < boardWidth; ++i) {
for (int j = 0; j < boardHeight; ++j) {
Shape.Tetromino shape = board[i][j];
if (shape != Shape.Tetromino.NoShape)
drawSquare(g, i * squareWidth,
boardTop + j * squareHeight, shape);
}
}
if (curPiece.retShape() != Shape.Tetromino.NoShape) {
for (int i = 0; i < 4; ++i) {
int x = curX + curPiece.coords[i][0];
int y = curY + curPiece.coords[i][1];
drawSquare(g, x * squareWidth,
boardTop + (y - 1) * squareHeight,
curPiece.retShape());
}
}
}
private void drawSquare(Graphics g, int x, int y, Shape.Tetromino shape)
{
Color colors[] = { new Color(0, 0, 0), new Color(204, 102, 102),
new Color(102, 204, 102), new Color(102, 102, 204),
new Color(204, 204, 102), new Color(204, 102, 204),
new Color(102, 204, 204), new Color(218, 170, 0)
};
Color color = colors[shape.ordinal()];
g.setColor(color);
g.fillRect(x + 1, y + 1, squareWidth - 2, squareHeight - 2);
g.setColor(color.brighter());
g.drawLine(x, y + squareHeight - 1, x, y);
g.drawLine(x, y, x + squareWidth - 1, y);
g.setColor(color.darker());
g.drawLine(x + 1, y + squareHeight - 1,
x + squareWidth - 1, y + squareHeight - 1);
g.drawLine(x + squareWidth - 1, y + squareHeight - 1,
x + squareWidth - 1, y + 1);
}
private void removeFullLines(){
int numLines = 0;
for(int i = 0; i < boardHeight; i++){
boolean isLineFull = true;
for(int j = 0; j < boardWidth; j++){
System.out.println("i = " + i + " j = " + j);
if(board[j][i] == Shape.Tetromino.NoShape){
System.out.println("Found No Shape here!");
isLineFull = false;
break;
}
}
System.out.println("IIIIIIIIS LINE : " + isLineFull);
if(isLineFull){
numLines++;
for(int k = i; k > 0; k--){
for(int j = 0; j < boardWidth; ++j){
board[j][k] = board[j][k-1];
}
}
}
}
if(numLines > 0){
score += numLines * numLines;
repaint();
newPiece();
}
}
class KeyHandler extends KeyAdapter{
public void keyPressed(KeyEvent e){
if(!isStarted || curPiece.retShape() == Shape.Tetromino.NoShape){
return;
}
int keyCode = e.getKeyCode();
switch(keyCode){
case KeyEvent.VK_LEFT:
tryMove(curPiece, curX - 1, curY);
break;
case KeyEvent.VK_RIGHT:
tryMove(curPiece, curX + 1, curY);
break;
case KeyEvent.VK_DOWN:
sleepTime = 10;
break;
case KeyEvent.VK_E:
int opt = JOptionPane.showConfirmDialog(null,"Are you sure?", "Exit", JOptionPane.YES_NO_OPTION);
if(opt == JOptionPane.YES_OPTION){
System.exit(0);
}
break;
case KeyEvent.VK_SPACE:
tryMove(curPiece.rotateLeft(), curX, curY);
break;
default:
break;
}
}
}
@Override
public void actionPerformed(ActionEvent e) {
if (isFallingFinished) {
isFallingFinished = false;
newPiece();
}
}
}
请帮忙。我怀疑问题出在重绘机制上，但我不确定。
最佳答案
您的问题似乎是 Swing 线程问题，因为您似乎是在 Swing 事件线程上调用 Thread.sleep(...)。这样做会锁定整个线程，卡住您的应用程序。不要这样做，而是使用 Swing Timer。
- > Swing Timer Tutorial : 关于如何使用 Swing 定时器的基本教程。
- > Concurrency in Swing Tutorial : 详细了解 Swing 事件分派(dispatch)线程 (EDT) 的工作原理。
顺便说一句，您不想覆盖 Swing GUI 的 update() 方法，因为它主要用于 AWT GUI，除非您在运行中更改应用程序的外观。
编辑
你问:
I understand that calling Thread.sleep() is undesirable and it is better to use timers. But the thing is that when I run the MatrixBoard individually, it works perfectly well. The thread issue is not faced here. Please explain if possible.
当您单独调用它时，主应用程序不会在 Swing 线程上运行(这不是应该做的事情——所有 Swing 应用程序应该在 Swing 事件线程上运行)，因此您的代码似乎 可以正常工作。一旦您强制它在 Swing 事件线程上运行，它就会卡住。
所有 Swing GUI 都应该使用 SwingUtilities.invokeLater(new Runnable() {...});
编辑2
观察当你改变这个时会发生什么:
public static void main(String [] args){
MatrixBoard b = new MatrixBoard();
}
到更合适的代码:
public static void main(String[] args){
SwingUtilities.invokeLater(new Runnable() {
public void run() {
MatrixBoard b = new MatrixBoard();
}
});
}
我敢打赌你的 MatrixBoard 不会死机(尽管我还没有测试过)。
关于java - 重绘未按要求正常运行，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/21800147/