SplashScene不居中

Question

我正在尝试使用AndEngine并且无法解决为什么我的防溅板没有在设备中居中 - 请参见下图。 我为设备(800, 480)设置了默认大小，并将启动放在camera.getWidth() / 2。好像我的飞溅的角落撞到了中心的漂亮点，但是我想让飞溅的中心居中 - 这有道理吗？

MainActivity：

package com.example.caspe.getmeout;

import org.andengine.engine.Engine;
import org.andengine.engine.LimitedFPSEngine;
import org.andengine.engine.camera.Camera;
import org.andengine.engine.handler.timer.ITimerCallback;
import org.andengine.engine.handler.timer.TimerHandler;
import org.andengine.engine.options.ScreenOrientation;
import org.andengine.engine.options.WakeLockOptions;
import org.andengine.engine.options.resolutionpolicy.RatioResolutionPolicy;    
import org.andengine.engine.options.EngineOptions;
import org.andengine.entity.scene.Scene;
import java.io.IOException;


public class MainActivity extends BaseGameActivity {
    private ResourcesManager resourcesManager;
    private static final int CAMERA_WIDTH = 800;
    private static final int CAMERA_HEIGHT = 480;
    private Camera camera;

    public EngineOptions onCreateEngineOptions() {
        camera = new Camera(0, 0, CAMERA_WIDTH, CAMERA_HEIGHT);
        EngineOptions engineOptions = new EngineOptions(true, ScreenOrientation.LANDSCAPE_FIXED, new RatioResolutionPolicy(800, 480), this.camera);
        engineOptions.getAudioOptions().setNeedsMusic(true).setNeedsSound(true);
        engineOptions.setWakeLockOptions(WakeLockOptions.SCREEN_ON);
        return engineOptions;
    }

    @Override
    public Engine onCreateEngine(EngineOptions pEngineOptions) {
        return new LimitedFPSEngine(pEngineOptions, 60);
    }

    @Override
    public void onCreateResources(OnCreateResourcesCallback pOnCreateResourcesCallback) throws Exception {
        ResourcesManager.prepareManager(mEngine, this, camera, getVertexBufferObjectManager());
        resourcesManager = ResourcesManager.getInstance();
        pOnCreateResourcesCallback.onCreateResourcesFinished();
    }

    @Override
    public void onCreateScene(OnCreateSceneCallback pOnCreateSceneCallback) throws IOException {
        SceneManager.getInstance().createSplashScene(pOnCreateSceneCallback);
    }

    @Override
    public void onPopulateScene(Scene pScene, OnPopulateSceneCallback pOnPopulateSceneCallback) throws IOException {
        mEngine.registerUpdateHandler(new TimerHandler(2f, new ITimerCallback() {
            public void onTimePassed(final TimerHandler pTimerHandler) {
                mEngine.unregisterUpdateHandler(pTimerHandler);
                // load menu resources, create menu scene
                // set menu scene using scene manager
                // disposeSplashScene();
            }
        }));
        pOnPopulateSceneCallback.onPopulateSceneFinished();
    }

}

Splash的代码：

package com.example.caspe.getmeout;

import org.andengine.engine.camera.Camera;
import org.andengine.entity.sprite.Sprite;
import org.andengine.opengl.util.GLState;
import com.example.caspe.getmeout.BaseScene;
import com.example.caspe.getmeout.SceneManager.SceneType

public class SplashScene extends BaseScene {

    private Sprite splash;

    @Override
    public void createScene() {
        splash = new Sprite(0,0, resourcesManager.splash_region, vbom) {
            @Override
            protected void preDraw(GLState pGLState, Camera pCamera) {
                super.preDraw(pGLState, pCamera);
                pGLState.enableDither();
            }
        };

        splash.setScale(1.5f);
        splash.setPosition(camera.getWidth() / 2, camera.getHeight() / 2);
        attachChild(splash);
    }

    @Override
    public void onBackKeyPressed() {
    }

    @Override
    public SceneType getSceneType() {
        return SceneType.SCENE_SPLASH;
    }

    @Override
    public void disposeScene() {
        splash.detachSelf();
        splash.dispose();
        this.detachSelf();
        this.dispose();
    }

}

如果您需要更多代码，请与我们联系。 我不是直接寻找一段工作的代码，而是更多我的错误，所以我可以使用我的braincells并解决它 - 我只是在这里瞎了眼。

Answer 1

splash.setPosition(camera.getWidth() / 2, camera.getHeight() / 2);

这还不够。你的飞溅实际上是正确居中的：左上角位于中心。

你需要的是从位置减去飞溅的半宽和高度。

// untested code
splash.setPosition(camera.getWidth() / 2 - splash.getWidth() / 2, camera.getHeight() / 2 - splash.getHeight() / 2);