java我不确定如何将我当前基于lwjgl的引擎与Jbox2D结合使用

Question

我用LWJGL做了一台发动机，到目前为止我很满意。当然，我现在已经准备好将物理添加到引擎中，这样我就可以开始用它创建一个游戏了。我选择使用Jbox2D，因为它看起来相当灵活，我已经将其导入到项目中，并完成了所有需要的设置，但是在将body系统实现到我的GameObject类中并运行游戏后，所有GameObjects似乎都位于窗口的中心，我相信我可能在代码中犯了一些错误：

private BodyDef bodyDef = new BodyDef();
private Body box = world.createBody(bodyDef);

public float MOVE_SPEED = 7.0f;

public TAG tag;

public static int direction = 0;
public int jumpsRemaining;

public float xSpeed = MOVE_SPEED;
public float ySpeed = MOVE_SPEED;
public float x, y;
public float sX = 32, sY = 32;

public boolean jumpPressed, jumpWasPressed;
public boolean jumping = false;
public boolean falling = true;

//public int collidingX = 0;
//public int collidingY = 0;
public Time time = new Time();

protected static final int UP = 1;
protected static final int RIGHT = 2;
protected static final int DOWN = 3;
protected static final int LEFT = 4;

private boolean left = true;
private boolean right = true;
private boolean up = true;
private boolean down = true;

private Sprite spr;

public GameObject(float sX, float sY, float posX, float posY, BodyType type) {
    this.sX = sX;
    this.sY = sY;
    this.x = posX;
    this.y = posY;
    initPhysics(type);

}

public GameObject(float posX, float posY, BodyType type) {
    this.x = posX;
    this.y = posY;
    initPhysics(type);
}

public abstract void update();

public abstract void input();

private void initPhysics(BodyType type){
    bodyDef.type = type;
    bodyDef.position.set(x/30,y/30);
    PolygonShape boxShape = new PolygonShape();
    boxShape.setAsBox(sX/30/2, sY/30/2);
    FixtureDef fixture = new FixtureDef();
    fixture.density = 1;
    fixture.shape = boxShape;
    box.createFixture(fixture);
    physicsBodies.add(box);
}

/**protected GameObject Colliding() {
    for (GameObject gob : gameObjects) {
        if (gob != this) {
            if (Collision.checkCollision(gob, this) != null) {
                return gob;
            }
        }
    }
    return null;
}**/

public void render() {

    if (spr != null) {
        glPushMatrix();
        {
            glTranslatef(box.getPosition().x * 30, box.getPosition().y * 30, 0);
            spr.renderSprite();
        }
        glPopMatrix();
    }
}

public void setTexture(String tex) {
    spr = new Sprite(sX, sY, tex);
}

如果你想知道的话，world和body hashSet都在主类中，我想我一定是把代码搞砸了。此外，我正在使用lwjgl的传统管道，因为它更简单，更适合发动机

Answer 1

我只是简单地将精灵的原点设置为中心，而不是左下角，这样就解决了问题，如下所示：

 glVertex2f(-sX / 2, -sY / 2);
 glTexCoord2f(0, 0);

 glVertex2f(-sX / 2, sY / 2);
 glTexCoord2f(1, 0);

 glVertex2f(sX / 2, sY / 2);
 glTexCoord2f(1, 1);

 glVertex2f(sX / 2, -sY / 2);
 glTexCoord2f(0, 1);

我希望这能帮助任何处于类似情况的人（sX是X码，sY是sizeY码）