Question

我的游戏存在问题，我无法找到问题，我的FPS从300降到1，每秒钟降低5到10 FPS，直到它无法播放。它首先在wave.myFirstGame.Handler.removeObject（Handler.java:31）给我一个错误，游戏开始但崩溃了。但当我删除给我这个错误的代码时，游戏可以正常工作，但FPS会下降，但仍然无法播放。

import java.awt.Color;
import java.awt.Graphics;
import java.awt.Rectangle;

public class BasicEnemy extends GameObject {

private Handler handler;


public BasicEnemy(int x, int y, ID id, Handler handler) {
    super(x, y, id);

    this.handler = handler;

    velX = 5;
    velY = 5;

}

public Rectangle getBounds() { //for collision

    return new Rectangle(x, y, 16, 16);
}

public void tick() {
    x += velX;
    y += velY;
    if (y <= 0 || y >= Game.HEIGHT - 32)
        velY *= -1; // limits of the screen for the enemy

    if (x <= 0 || x >= Game.WIDTH - 16)
        velX *= -1;

    handler.addObject(new Trail(x, y,ID.Trail, Color.red, 16, 16, 0.02f, handler));
}

public void render(Graphics g) {
    g.setColor(Color.red);
    g.fillRect(x, y, 16, 16);
}

这是Handler类，我在最后一行得到了错误包wave.myFirstGame;

import java.awt.Graphics;
import java.util.LinkedList;

public class Handler {

    LinkedList<GameObject> object = new LinkedList<GameObject>();

    public void tick() {
        for (int i = 0; i < object.size(); i++) {
            GameObject tempObject = object.get(i);
            tempObject.tick();
        }
    }

    public void render(Graphics g) {
        for (int i = 0; i < object.size(); i++) {
            GameObject tempObject = object.get(i);
            tempObject.render(g);

        }

    }

    public void addObject(GameObject object) {
        this.object.add(object);
    }

    public void removeObject(GameObject object) {
        this.removeObject(object);  //this is the error and the game craches after 1 sec, if i remove it, it works but FPS drops
    }
}

这里是Trail，当我这样做时问题就开始了。

import java.awt.AlphaComposite;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Rectangle;

public class Trail extends GameObject  {

    private float alpha = 1;

    private float life;
    private Handler handler;
    private Color color;
    private int width, height;

    //life value between  0.001 - 0.1

    public Trail(int x, int y, ID id , Color color, int width, int height, float life, Handler handler) { // constructor
        super(x, y, id);
        this.handler = handler;
        this.color = color;
        this.width = width;
        this.height = height;
        this.life = life;
    }


    public void tick() {
        if(alpha > life){
            alpha -= (life - 0.001f);
        }
        else handler.removeObject(this);

    }

    public void render(Graphics g) {
        Graphics2D g2d = (Graphics2D) g;
        g2d.setComposite(makeTransparent(alpha));
        g.setColor(color);
        g.fillRect(x, y, width, height);
        g2d.setComposite(makeTransparent(1)); // we wanna sandwitch our alpha and 1

    }

    private AlphaComposite makeTransparent(float alpha){

        int type = AlphaComposite.SRC_OVER;
        return(AlphaComposite.getInstance(type, alpha));
    }

    public Rectangle getBounds() {

        return null;
    }



}

我知道很多代码，但我找不到问题，所以如果你有任何建议或想法，那么听听它们会很棒。谢谢！

Answer 1

public void removeObject(GameObject object) {
    this.removeObject(object);  //this is the error and the game craches after 1 sec, if i remove it, it works but FPS drops
}

你在方法中调用方法 - ＆gt; StackOverflowError

应该是：

public void removeObject(GameObject object) {
    this.object.remove(object);  //this is the error and the game craches after 1 sec, if i remove it, it works but FPS drops
}

此外，您每次添加一个新的Trail对象，并且永远不会删除它，因此您可能会耗尽内存。尝试在构造函数中添加一次，然后使用getter和setter更改其x和y。

Answer 2

您没有告诉我们错误是什么，但我怀疑它是堆栈溢出。这是因为您反复永久地呼叫removeObject()。

更改

this.removeObject(object);

到

this.object.remove(object);

我还建议将LinkedList<GameObject> object的名称更改为LinkedList<GameObject> objects，因为它是多个对象的集合，有助于减少addObject()和removeObject()中的混淆参数具有相同名称的函数。

Answer 3

我认为这条线是潜在的泄漏：

handler.addObject(new Trail(x, y,ID.Trail, Color.red, 16, 16, 0.02f, handler));

您正在每个刻度线创建一个Trail类型的新对象。这可能会导致缓慢......以及之后的崩溃。

您确定无法重复使用该对象吗？

Java游戏，FPS从300下降到1

3 个答案: