java - LibGDX - tile/tilemaps 中的纹理文本

Question

有什么方法可以在 Tilemaps 中将文本放在纹理上？

我正在开发一款基于跳棋的游戏，我需要显示单个方 block 中有多少跳棋。我使用 TiledMap 加载电路板。我的代码如下:

GameScreen.java

public class GameScreen implements Screen {

private TiledMap board;

public GameScreen(final MyGame gam) {

   board = new TmxMapLoader().load("maps/tablero-64.tmx");
   renderer = new OrthogonalTiledMapRenderer(board, 1/64f);

   boardCamera = new OrthographicCamera();
   boardCamera.setToOrtho(false, WIDTH, HEIGHT);
   boardCamera.position.set(CENTERX, CENTERY, 0);

   // Added this to avoid continuous rendering
   Gdx.graphics.setContinuousRendering(false);
   Gdx.graphics.requestRendering();
}

@Override
public void render(float delta) {
   boardCamera.update();
   renderer.setView(boardCamera);
   renderer.render();
   renderer.getSpriteBatch().begin();
   for (Stack checker : whiteCheckers) checker.draw(renderer.getSpriteBatch(), 1);
   for (Stack checker : blackCheckers) checker.draw(renderer.getSpriteBatch(), 1);
   renderer.getSpriteBatch().end();
}
}

Stack.java

public class Stack extends Actor {

   static BitmapFont font = new BitmapFont(Gdx.files.internal("fonts/estragelo.fnt"), Gdx.files.internal("fonts/estragelo.png"), true);  // Line 31

   @Override
   public void draw(SpriteBatch batch, float parentAlpha) {
      batch.draw(this.texture,
            this.boardPosition.x,
            this.boardPosition.y,
            this.size,
            this.size);
      // This DOESN'T work
      font.draw(batch, "10", this.boardPosition.x, this.boardPosition.y); // Line 296
   }
}

提前致谢。

编辑:我添加错误日志:

12-24 17:49:18.178: E/AndroidRuntime(3365): FATAL EXCEPTION: GLThread
12-24 17:49:18.178: E/AndroidRuntime(3365): java.lang.ExceptionInInitializerError
12-24 17:49:18.178: E/AndroidRuntime(3365):     at my.package.GameScreen.<init>(GameScreen.java:81)
12-24 17:49:18.178: E/AndroidRuntime(3365):     at my.package.MainMenuScreen.render(MainMenuScreen.java:36)
12-24 17:49:18.178: E/AndroidRuntime(3365):     at com.badlogic.gdx.Game.render(Game.java:46)
12-24 17:49:18.178: E/AndroidRuntime(3365):     at my.package.MyGame.render(MyGame.java:23)
12-24 17:49:18.178: E/AndroidRuntime(3365):     at com.badlogic.gdx.backends.android.AndroidGraphics.onDrawFrame(AndroidGraphics.java:487)
12-24 17:49:18.178: E/AndroidRuntime(3365):     at com.badlogic.gdx.backends.android.surfaceview.GLSurfaceViewCupcake$GLThread.guardedRun(GLSurfaceViewCupcake.java:713)
12-24 17:49:18.178: E/AndroidRuntime(3365):     at com.badlogic.gdx.backends.android.surfaceview.GLSurfaceViewCupcake$GLThread.run(GLSurfaceViewCupcake.java:646)
12-24 17:49:18.178: E/AndroidRuntime(3365): Caused by: com.badlogic.gdx.utils.GdxRuntimeException: Error loading font file: fonts/estragelo.fnt
12-24 17:49:18.178: E/AndroidRuntime(3365):     at com.badlogic.gdx.graphics.g2d.BitmapFont$BitmapFontData.<init>(BitmapFont.java:971)
12-24 17:49:18.178: E/AndroidRuntime(3365):     at com.badlogic.gdx.graphics.g2d.BitmapFont.<init>(BitmapFont.java:135)
12-24 17:49:18.178: E/AndroidRuntime(3365):     at com.badlogic.gdx.graphics.g2d.BitmapFont.<init>(BitmapFont.java:127)
12-24 17:49:18.178: E/AndroidRuntime(3365):     at my.package.Stack.<clinit>(Stack.java:31)
12-24 17:49:18.178: E/AndroidRuntime(3365):     ... 7 more
12-24 17:49:18.178: E/AndroidRuntime(3365): Caused by: java.lang.ArrayIndexOutOfBoundsException
12-24 17:49:18.178: E/AndroidRuntime(3365):     at com.badlogic.gdx.graphics.g2d.BitmapFont$BitmapFontData.<init>(BitmapFont.java:836)
12-24 17:49:18.178: E/AndroidRuntime(3365):     ... 10 more

编辑 2:问题是字体。 Estragelo 字体生成两个 PNG 文件，但您只能在 BitmapFont 构造函数中指定一个。所以我改成 Arial 字体，它起作用了。但是现在我遇到了与开始时相同的问题。这给了我与这样做相同的结果:

public void draw(SpriteBatch batch, float parentAlpha) {
    BitmapFont font = new BitmapFont();
    font.draw(batch, "10", this.boardPosition.x, this.boardPosition.y);
}

在某种程度上，它正在绘制数字，但位置和大小都不好。这是结果(boardPosition 是 (4,0) 和 (3,7)，其中放置了跳棋):

Answer 1

新答案:

由于您的新BitmapFont 字体是静态的，它会在Gdx 初始化之前加载。这就是为什么它不起作用。为避免这种情况，您可以将静态字段 font 留空并在 GameScreen 构造函数中分配它:

public class Stack extends Actor {

   static BitmapFont font;

   @Override
   public void draw(SpriteBatch batch, float parentAlpha) {
   //your draw stuff
   }
}

然后在构造函数中分配字体:

public class GameScreen implements Screen {

public GameScreen(final MyGame gam) {
//your initializers and settings
Stack.font=new BitmapFont(Gdx.files.internal("fonts/estragelo.fnt"), Gdx.files.internal("fonts/estragelo.png"), true); 
}

旧答案:

您必须使用 Hiero 或 [BMFont]( http://www.angelcode.com/products/bmfont/) 创建字体并使用生成的文件:

font=new BitmapFont(Gdx.files.local("fonts/font.fnt"),
Gdx.files.local("fonts/font.png"), true);

在我的例子中，字体文件位于我工作区的子文件夹“fonts”中。

在 BMFont 中，您可以选择字体的大小、样式等。

编辑:您应该考虑 noncontinuous rendering对于游戏来说，因为棋盘游戏没有必要每一帧都重新绘制图形。