添加到其他 JPanel 时 JPanel 不呈现
JPanel not rendering when added to other JPanel
这是我的游戏Class:
package Game;
import java.awt.Color;
import java.awt.Graphics;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class Game extends JPanel implements Runnable {
Thread thread;
private boolean running = true;
private double FPS = 1.0/60.0;
private Level level;
public Game(){
level = new LevelOne();
level.setBackground(Color.BLACK);
add(level);
}
public synchronized void start() {
thread = new Thread(this, "Game");
thread.start();
}
public synchronized void stop() {
running = false;
try {
thread.join();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
@Override
public void run() {
double firstTime = 0;
double lastTime = System.nanoTime() / 1000000000.0;
double passedTime = 0;
double updateTime = 0;
double timer = System.nanoTime() / 1000000000.0;
int rendered = 0;
int updates = 0;
while (running) {
firstTime = System.nanoTime() / 1000000000.0;
passedTime = firstTime - lastTime;
lastTime = firstTime;
updateTime += passedTime;
while(updateTime > FPS){
updates++;
update();
updateTime -= FPS;
}
render();
rendered++;
if((System.nanoTime() / 1000000000) - timer > 1){
timer += 1;
System.out.println("FPS:"+rendered+" Updates:"+updates);
updates = 0;
rendered = 0;
}
}
}
private void update() {
}
private void render() {
this.repaint();
}
public void paintComponent(Graphics g){
super.paintComponent(g);
level.repaint();
}
public static void main(String[] args) {
JFrame frame = new JFrame();
frame.setLocationRelativeTo(null);
frame.setSize(300, 300);
frame.setVisible(true);
frame.setTitle("Game");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
Game game = new Game();
frame.add(game);
game.start();
}
}
我的 LevelOne class:
包游戏;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import javax.imageio.ImageIO;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class LevelOne extends Level {
private BufferedImage spriteSheet;
private BufferedImage[] player = new BufferedImage[4]; //0 = down, 1 = right, 2 = up, 3 = left
private int dir = 0;
private String UP = "W";
private String DOWN = "S";
private String LEFT = "A";
private String RIGHT = "D";
private int speedX = 0;
private int speedY = 0;
public LevelOne(){
try {
spriteSheet = ImageIO.read(new File("images/sprites.png"));
} catch (IOException e) {
e.printStackTrace();
}
for (int i = 0; i < 4; i++) {
player[i] = spriteSheet.getSubimage((i * 18), 0, 18, 28);
}
this.addKeyListener(new KeyListener() {
@Override
public void keyPressed(KeyEvent e) {
String key = e.getKeyText(e.getKeyCode());
if (key.equals(UP)) {
dir = 2;
speedY = -5;
} else if (key.equals(LEFT)) {
dir = 3;
speedX = -5;
} else if (key.equals(RIGHT)) {
dir = 1;
speedX = 5;
} else if (key.equals(DOWN)) {
dir = 0;
speedY = 5;
}
}
@Override
public void keyReleased(KeyEvent e) {
String key = e.getKeyText(e.getKeyCode());
if (key.equals(UP)) {
speedY = 0;
} else if (key.equals(LEFT)) {
speedX = 0;
} else if (key.equals(RIGHT)) {
speedX = 0;
} else if (key.equals(DOWN)) {
speedY = 0;
}
}
@Override
public void keyTyped(KeyEvent e) {
}
});
}
public void paintComponent(Graphics g){
super.paintComponent(g);
g.drawImage(player[dir], 0, 0, 18, 28, null);
}
}
LevelOne extends Level,目前是空的(并且扩展了JPanel),我不确定是否需要在Level中添加任何东西。我只是不知道我需要做什么才能显示播放器图像...
如果我的代码草率,我很抱歉,我正在尝试进入更高级别 Java,我不确定我是不是走错了。
谢谢。
六件事...
- 不要从
Game
的 paintComponent
方法中调用 level.repaint
,这可能会导致重新绘制请求的无限循环,从而影响您的帧速率。考虑在你的渲染方法中调用它
paintComponent
永远不应该 public
,任何人都没有理由直接调用它。
- 在
KeyListener
上使用键绑定,它们将解决与焦点相关的问题。 How to Use Key Bindings
- 在
frame.add(game);
之后移动 frame.setVisible
,事实上,它真的应该是你做的最后一件事
- 确保您的图片加载正确
- 将
Game
的布局管理器设置为 BorderLayout
这是我的游戏Class:
package Game;
import java.awt.Color;
import java.awt.Graphics;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class Game extends JPanel implements Runnable {
Thread thread;
private boolean running = true;
private double FPS = 1.0/60.0;
private Level level;
public Game(){
level = new LevelOne();
level.setBackground(Color.BLACK);
add(level);
}
public synchronized void start() {
thread = new Thread(this, "Game");
thread.start();
}
public synchronized void stop() {
running = false;
try {
thread.join();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
@Override
public void run() {
double firstTime = 0;
double lastTime = System.nanoTime() / 1000000000.0;
double passedTime = 0;
double updateTime = 0;
double timer = System.nanoTime() / 1000000000.0;
int rendered = 0;
int updates = 0;
while (running) {
firstTime = System.nanoTime() / 1000000000.0;
passedTime = firstTime - lastTime;
lastTime = firstTime;
updateTime += passedTime;
while(updateTime > FPS){
updates++;
update();
updateTime -= FPS;
}
render();
rendered++;
if((System.nanoTime() / 1000000000) - timer > 1){
timer += 1;
System.out.println("FPS:"+rendered+" Updates:"+updates);
updates = 0;
rendered = 0;
}
}
}
private void update() {
}
private void render() {
this.repaint();
}
public void paintComponent(Graphics g){
super.paintComponent(g);
level.repaint();
}
public static void main(String[] args) {
JFrame frame = new JFrame();
frame.setLocationRelativeTo(null);
frame.setSize(300, 300);
frame.setVisible(true);
frame.setTitle("Game");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
Game game = new Game();
frame.add(game);
game.start();
}
}
我的 LevelOne class: 包游戏;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import javax.imageio.ImageIO;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class LevelOne extends Level {
private BufferedImage spriteSheet;
private BufferedImage[] player = new BufferedImage[4]; //0 = down, 1 = right, 2 = up, 3 = left
private int dir = 0;
private String UP = "W";
private String DOWN = "S";
private String LEFT = "A";
private String RIGHT = "D";
private int speedX = 0;
private int speedY = 0;
public LevelOne(){
try {
spriteSheet = ImageIO.read(new File("images/sprites.png"));
} catch (IOException e) {
e.printStackTrace();
}
for (int i = 0; i < 4; i++) {
player[i] = spriteSheet.getSubimage((i * 18), 0, 18, 28);
}
this.addKeyListener(new KeyListener() {
@Override
public void keyPressed(KeyEvent e) {
String key = e.getKeyText(e.getKeyCode());
if (key.equals(UP)) {
dir = 2;
speedY = -5;
} else if (key.equals(LEFT)) {
dir = 3;
speedX = -5;
} else if (key.equals(RIGHT)) {
dir = 1;
speedX = 5;
} else if (key.equals(DOWN)) {
dir = 0;
speedY = 5;
}
}
@Override
public void keyReleased(KeyEvent e) {
String key = e.getKeyText(e.getKeyCode());
if (key.equals(UP)) {
speedY = 0;
} else if (key.equals(LEFT)) {
speedX = 0;
} else if (key.equals(RIGHT)) {
speedX = 0;
} else if (key.equals(DOWN)) {
speedY = 0;
}
}
@Override
public void keyTyped(KeyEvent e) {
}
});
}
public void paintComponent(Graphics g){
super.paintComponent(g);
g.drawImage(player[dir], 0, 0, 18, 28, null);
}
}
LevelOne extends Level,目前是空的(并且扩展了JPanel),我不确定是否需要在Level中添加任何东西。我只是不知道我需要做什么才能显示播放器图像...
如果我的代码草率,我很抱歉,我正在尝试进入更高级别 Java,我不确定我是不是走错了。
谢谢。
六件事...
- 不要从
Game
的paintComponent
方法中调用level.repaint
,这可能会导致重新绘制请求的无限循环,从而影响您的帧速率。考虑在你的渲染方法中调用它 paintComponent
永远不应该public
,任何人都没有理由直接调用它。- 在
KeyListener
上使用键绑定,它们将解决与焦点相关的问题。 How to Use Key Bindings - 在
frame.add(game);
之后移动frame.setVisible
,事实上,它真的应该是你做的最后一件事 - 确保您的图片加载正确
- 将
Game
的布局管理器设置为BorderLayout