java - 获取 java 图像的堆空间问题

Question

作为序言，我是一名初级程序员，希望将动画添加到我制作的简单游戏中。我创建了一个单独的类来测试我的动画，除了两个之外，每个图像都显示。我当前的代码是:

import java.awt.Color;
import java.awt.Graphics;
import java.awt.Image;
import java.net.URL;

import javax.swing.JApplet;

public class GooAnimation extends JApplet implements Runnable {

Image[] eastbarf = new Image[22];
Image[] east2barf = new Image[10];
boolean enter = false;
int counter = 0;
Image img1;
URL url;

public void init() {

    eastbarf[0] = getImage(getDocumentBase(), "eastbarf1.png");
    eastbarf[1] = getImage(getDocumentBase(), "eastbarf2.png");
    eastbarf[2] = getImage(getDocumentBase(), "eastbarf3.png");
    eastbarf[3] = getImage(getDocumentBase(), "eastbarf4.png");
    eastbarf[4] = getImage(getDocumentBase(), "eastbarf5.png");
    eastbarf[5] = getImage(getDocumentBase(), "eastbarf6.png");
    eastbarf[6] = getImage(getDocumentBase(), "eastbarf7.png");
    eastbarf[7] = getImage(getDocumentBase(), "eastbarf8.png");
    eastbarf[8] = getImage(getDocumentBase(), "eastbarf9.png");
    eastbarf[9] = getImage(getDocumentBase(), "eastbarf10.png");
    eastbarf[10] = getImage(getDocumentBase(), "eastbarf11.png");
    eastbarf[11] = getImage(getDocumentBase(), "eastbarf12.png");
    eastbarf[12] = getImage(getDocumentBase(), "eastbarf13.png");
    eastbarf[13] = getImage(getDocumentBase(), "eastbarf14.png");
    eastbarf[14] = getImage(getDocumentBase(), "eastbarf15.png");
    eastbarf[15] = getImage(getDocumentBase(), "eastbarf16.png");
    eastbarf[16] = getImage(getDocumentBase(), "eastbarf17.png");
    eastbarf[17] = getImage(getDocumentBase(), "eastbarf18.png");
    eastbarf[18] = getImage(getDocumentBase(), "eastbarf19.png");
    eastbarf[19] = getImage(getDocumentBase(), "eastbarf20.png");
    eastbarf[20] = getImage(getDocumentBase(), "eastbarf21.png");
    eastbarf[21] = getImage(getDocumentBase(), "eastbarf22.png");

    east2barf[0] = getImage(getDocumentBase(), "east2barf1.png");
    east2barf[1] = getImage(getDocumentBase(), "east2barf2.png");
    east2barf[2] = getImage(getDocumentBase(), "east2barf3.png");
    east2barf[3] = getImage(getDocumentBase(), "east2barf4.png");
    east2barf[4] = getImage(getDocumentBase(), "east2barf5.png");
    east2barf[5] = getImage(getDocumentBase(), "east2barf6.png");
    east2barf[6] = getImage(getDocumentBase(), "east2barf7.png");
    east2barf[7] = getImage(getDocumentBase(), "east2barf8.png");
    east2barf[8] = getImage(getDocumentBase(), "east2barf9.png");
    east2barf[9] = getImage(getDocumentBase(), "east2barf10.png");

}

@Override
public void run() {
    while (true) {
        repaint();
        try {
            Thread.sleep(1000);

        } catch (InterruptedException e) {

        }
    }

}

@Override
public void start() {
    Thread thread = new Thread(this);
    thread.start();
}

@Override
public void paint(Graphics g) {
    // for (int i = 0; i < eastbarf.length; i++) {
    if (enter) {
        if (counter < 10) {
            g.setColor(Color.WHITE);
            g.drawRect(0, 0, 10000, 10000);
            g.fillRect(0,0,10000,10000);
            g.drawImage(east2barf[counter], 300, 0, 1000, 1000, this);
            System.out.println(eastbarf[counter].getHeight(null));
        }
        if (counter == 10) {
            counter = 0;
            enter = false;
        }
    }
    if (!enter) {
        if (counter < 22) {
            // if ((i - 1)%2 == 1) {
            //

            // }
            System.out.println(counter);
            if (eastbarf[counter] == null) {
                System.out.println("Its null!");
            }
            // if (counter % 2 == 1) {
            // g.setColor(Color.YELLOW);
            // }
            // else {
            // g.setColor(Color.MAGENTA);
            // }
            g.setColor(Color.WHITE);
            g.drawRect(0, 0, 10000, 10000);
            g.fillRect(0,0,10000,10000);
            g.drawImage(eastbarf[counter], 0, 0, 1000, 1000, this);
            System.out.println(eastbarf[counter].getHeight(null));

            // }
        }

        // }

        if (counter > 21) {
            enter = true;
            counter = 0;
        }
    }
    counter += 1;
    // g.drawImage(img1, 0, 0, null);


}

我收到两个错误:

Exception in thread "Image Fetcher 0" java.lang.OutOfMemoryError: Java heap space
Exception in thread "Image Fetcher 2" java.lang.OutOfMemoryError: Java heap space

不过，我查阅了如何增加 Eclipse 堆空间并将其加倍。我不确定这是否足够。理想情况下，我会有 4 个相同长度的 barf 列表和 4 个 2barf 列表。如您所见，我已将所有图片的名称分开，以便于概念化。我是新手，不知道图像方面的最佳实践或 JApplet/Swing 的东西。如果有人能帮助弄清楚为什么我在两张图片上失败了，我将不胜感激。缺少的图像是 eastbarf2 中的第六和第八图像。我真的很感激一些帮助。谢谢编辑:每张图片大约 80-150 kb。在 Eclipse 中，这些是我放入运行配置的参数部分的命令。 -Xms1024M -Xmx2048M。他们似乎没有改变任何东西。

Answer 1

g.drawRect(0, 0, 10000, 10000);
g.fillRect(0,0,10000,10000);
g.drawImage(east2barf[counter], 300, 0, 1000, 1000, this);

你在屏幕上填充 10k x 10k 像素，然后你绘制尺寸为 1000 x 1000 的图像，这肯定会破坏你的内存。如果你想为你的游戏制作一张大 map ，你必须使用正交相机实现一个 tileset map ，它只会渲染玩家所在的屏幕，例如将所有图像更改为 BufferedImage 并尝试一下:

[...]

    g.drawRect(0, 0, 800, 600);
    g.fillRect(0,0,800,600);
    g.drawImage(east2barf[counter], 300, 0, east2barf[counter].getWidth(), east2barf[counter].getHeight(), this);

[...]

        g.setColor(Color.WHITE);
        g.drawRect(0, 0, 800, 600);
        g.fillRect(0,0,800,600);
        g.drawImage(eastbarf[counter], 0, 0, east2barf[counter].getWidth(), east2barf[counter].getHeight(), this);

[...]