我目前正在制作我的第一个“跳跃与奔跑”游戏。初始部分已经工作得很好，但当我的“列”移动时，我仍然遇到一个“错误”。仅当“MOVE_SPEED”为 1< 时才会发生这种情况。我也用计时器尝试过，同样的事情。
它是这样的:
请看一下代码:
...
public class Board implements Runnable, KeyListener {
JFrame frame;
ArrayList<Column> cList;
Player p;
private boolean ingame = false;
public final static int INIT_WIDTH = 600;
public final static int INIT_HEIGHT = 400;
public static int WIDTH;
public static int HEIGHT;
private final int MOVE_SPEED = 10;
//When this is 1 the problem doesnt appear!
private final int GRAVITY = -3;
private int cPlayerStayingOn;
private double playerBottom;
private double floorTop;
private boolean mR = false;
private boolean mL = false;
private boolean jump = false;
long lastLoopTime = System.nanoTime();
final int TARGET_FPS = 100;
final long OPTIMAL_TIME = 1000000000 / TARGET_FPS;
private int fps;
private int lastFpsTime;
public static double delta = 1;
public Board() {
initBoard();
initPlayer();
initColumns();
}
private void initBoard() {
frame = new JFrame("Jump'nRun");
frame.setSize(INIT_WIDTH, INIT_HEIGHT);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLayout(null);
frame.addKeyListener(this);
cList = new ArrayList<Column>();
frame.setVisible(true);
Board.WIDTH = frame.getContentPane().getWidth();
Board.HEIGHT = frame.getContentPane().getHeight();
}
private void initColumns() {
for (int i = 0; i < 8; i++) {
cList.add(new Column(i + 1, true));
frame.add(cList.get(i));
}
}
private void initPlayer() {
p = new Player();
frame.add(p);
}
private void moveColums() {
for (Column col : cList) {
col.setLocation((int) (col.getLocation().getX() - MOVE_SPEED), 0);
}
}
private int playerStanding(double pX) {
for (int i = 0; i < 8; i++) {
if (cList.get(i).getX() <= pX
&& (cList.get(i).getX() + cList.get(i).getWidth()) >= pX) {
return i;
}
}
return -1;
}
private void movePlayer() {
// gravity
if (playerBottom < floorTop) {
p.setLocation((int) p.getLocation().getX(), (int) p.getLocation()
.getY() - GRAVITY);
}
if (mR) {
p.moveRight();
}
if (mL) {
p.moveLeft();
}
if (jump) {
p.jump();
jump = false;
}
}
private void collectData() {
this.cPlayerStayingOn = playerStanding(p.getBounds().getX()
+ p.getBounds().getWidth());
this.playerBottom = p.getBounds().getMaxY();
this.floorTop = cList.get(cPlayerStayingOn).floor.getY();
}
private void recycleColums() {
if (cList.get(0).getX() + cList.get(0).getWidth() <= 0) {
cList.remove(0);
cList.add(7, new Column(7 + 1, false));
frame.add(cList.get(7));
}
}
@Override
public void keyTyped(KeyEvent e) {
// TODO Auto-generated method stub
}
@Override
public void keyPressed(KeyEvent e) {
if (e.getKeyCode() == KeyEvent.VK_SPACE
|| e.getKeyCode() == KeyEvent.VK_W
|| e.getKeyCode() == KeyEvent.VK_UP) {
if (playerBottom >= floorTop) {
jump = true;
}
}
if (e.getKeyCode() == KeyEvent.VK_D
|| e.getKeyCode() == KeyEvent.VK_RIGHT) {
mR = true;
}
if (e.getKeyCode() == KeyEvent.VK_A
|| e.getKeyCode() == KeyEvent.VK_LEFT) {
mL = true;
}
}
@Override
public void keyReleased(KeyEvent e) {
if (e.getKeyCode() == KeyEvent.VK_D
|| e.getKeyCode() == KeyEvent.VK_RIGHT) {
mR = false;
}
if (e.getKeyCode() == KeyEvent.VK_A
|| e.getKeyCode() == KeyEvent.VK_LEFT) {
mL = false;
}
}
private int getFps() {
return fps;
}
private void setFps(int fps) {
this.fps = fps;
}
@Override
public void run() {
while (true) {
if (!ingame) {
ingame = true;
} else {
long now = System.nanoTime();
long updateLength = now - lastLoopTime;
lastLoopTime = now;
delta = updateLength / ((double) OPTIMAL_TIME);
lastFpsTime += updateLength;
setFps(getFps() + 1);
if (lastFpsTime >= 1000000000) {
lastFpsTime = 0;
setFps(0);
}
recycleColums();
collectData();
moveColums();
movePlayer();
try {
Thread.sleep((lastLoopTime - System.nanoTime() + OPTIMAL_TIME) / 1000000);
} catch (Exception e) {
}
}
}
}
}
和列类:
...
public class Column extends JPanel {
JPanel floor;
JPanel grass;
Random rand = new Random();
private static final long serialVersionUID = 1L;
public final static int WIDTH = Board.WIDTH / 6;
public final int HEIGHT = Board.HEIGHT;
private int position;
public final static int FLOOR_H = WIDTH;
public Column(int pos, boolean init) {
this.position = pos;
setBounds((WIDTH * position) - WIDTH, 0, WIDTH, HEIGHT);
setLayout(null);
setBackground(Color.WHITE);
floor = new JPanel();
floor.setLayout(null);
floor.setBackground(Color.BLACK);
if (init) {
floor.setBounds(0, HEIGHT - FLOOR_H, WIDTH, FLOOR_H);
} else {
floor.setBounds(0,
(HEIGHT - (FLOOR_H + (FLOOR_H * rand.nextInt(2) / 2))),
WIDTH, FLOOR_H * 2);
}
grass = new JPanel();
grass.setBounds(0, 0, WIDTH, 10);
grass.setBackground(Color.GREEN);
floor.add(grass);
add(floor);
}
}
任何提示都值得赞赏!
(抱歉英语不好)
最佳答案
我通过更改以下内容修复了该问题:
private void recycleColums() {
if (cList.get(0).getX() + cList.get(0).getWidth() <= 0) {
cList.remove(0);
cList.add(7, new Column(7 + 1, false, cList.get(6).getX()));
frame.add(cList.get(7));
}
}
...
public Column(int pos, boolean init, int lastX) {
this.position = pos;
setLayout(null);
setBackground(Color.WHITE);
floor = new JPanel();
floor.setLayout(null);
floor.setBackground(Color.BLACK);
if (init) {
setBounds((WIDTH * position) - WIDTH, 0, WIDTH, HEIGHT);
floor.setBounds(0, HEIGHT - FLOOR_H, WIDTH, FLOOR_H);
} else {
setBounds(lastX + WIDTH, 0, WIDTH, HEIGHT);
floor.setBounds(0,
(HEIGHT - (FLOOR_H + (FLOOR_H * rand.nextInt(2) / 2))),
WIDTH, FLOOR_H * 2);
}
关于2D游戏中Java swing渲染现象，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/36727540/