java - 如何将播放器置于 libgDX 相机的中心

Question

我最近刚刚开始使用 libGDX 来制作游戏，并且我正在尝试实现一个正交相机，以便在玩家移动时让玩家放松(制作 2D 横向卷轴)。由于某种原因，我不明白当我执行所有应该使相机将玩家绘制在屏幕中心的操作时，玩家会稍微向右上角移动。

我一整天都在尝试不同的事情，但没有找到任何解决方案。

如果它有帮助的话，我的玩家 Sprite 是一个方形的 128 x 128 图像，我的显示器尺寸是 1366x768

这是我的游戏屏幕代码:

 package com.inertiafall.inertiaengine.screens;

import com.badlogic.gdx.Gdx;
import com.badlogic.gdx.Screen;
import com.badlogic.gdx.graphics.GL10;
import com.badlogic.gdx.graphics.OrthographicCamera;
import com.badlogic.gdx.graphics.g2d.SpriteBatch;
import com.badlogic.gdx.graphics.glutils.ShapeRenderer;
import com.badlogic.gdx.graphics.glutils.ShapeRenderer.ShapeType;
import com.badlogic.gdx.math.Vector3;
import com.inertiafall.inertiaengine.InertiaEngine;
import com.inertiafall.inertiaengine.InputHandler;
import com.inertiafall.inertiaengine.entities.Player;

public class GameScreen implements Screen {
    InertiaEngine game;
    SpriteBatch batch;
    Player player;

    OrthographicCamera cam;
    float width, height;
    ShapeRenderer sr;

    public GameScreen(InertiaEngine game){
        this.game = game;
    }

    public void show() {    
        player = new Player(5, 5);  
        player.init();
        width = Gdx.graphics.getWidth();
        height = Gdx.graphics.getHeight();

        cam = new OrthographicCamera(width, height);
        cam.setToOrtho(false);
        cam.position.set(player.getX(), player.getY(), 0);
        cam.update();

        batch = new SpriteBatch();
        batch.setProjectionMatrix(cam.combined);


        sr = new ShapeRenderer();
    }

    public void update(float delta){
        checkKeys();
        player.update(delta);
        cam.position.set(player.getX(), player.getY(), 0);
        cam.unproject(new Vector3(player.getX(), player.getY(), 0));
        cam.update();
        batch.setProjectionMatrix(cam.combined);    
        sr.setProjectionMatrix(cam.combined);
    }

    public void render(float delta) {
        update(delta);  
        Gdx.gl.glClearColor(0, 0, 0, 1);
        Gdx.gl.glClear(GL10.GL_COLOR_BUFFER_BIT);

        batch.begin();
        player.render(batch);
        batch.end();        

        sr.begin(ShapeType.Line);
        player.renderDebug(sr); 
        sr.end();
    }

    public void resize(int width, int height) {

    }

    //check key events  
    private void checkKeys(){       
        if(InputHandler.keyPress(InputHandler.getExitKey())){
            exit();
        }
    }

    //key events
    private void exit(){
        Gdx.app.exit();
    }

    public void hide() {
        dispose();
    }

    public void pause() {}

    public void resume() {}

    public void dispose() {
        batch.dispose();
        player.dispose();
        sr.dispose();
    }

}

Answer 1

我认为这可能是您将相机设置为player.getX()或getY()的地方。该 X 和 Y 值指向玩家 Sprite 的角点。尝试将相机设置为

player.getX() + (player.getWidth() / 2)

和

player.getY() + (player.getHeight() / 2)

它应该是玩家 Sprite 的中心。