LibGDX中ShapeDrawer无渲染输出，仅显示黑屏问题求助

使用LibGDX的ShapeDrawer组件时遇到问题，组件无法渲染任何图形，运行后仅显示黑屏。附上相关代码，寻求解决方法：

package com.davidclue.tanksii;

import com.badlogic.gdx.ApplicationAdapter;
import com.badlogic.gdx.graphics.Color;
import com.badlogic.gdx.graphics.Pixmap;
import com.badlogic.gdx.graphics.Pixmap.Format;
import com.badlogic.gdx.graphics.Texture;
import com.badlogic.gdx.graphics.g2d.PolygonSpriteBatch;
import com.badlogic.gdx.graphics.g2d.TextureRegion;
import com.badlogic.gdx.utils.ScreenUtils;
import com.davidclue.tanksii.input.InputHandler;

import space.earlygrey.shapedrawer.ShapeDrawer;

public class TanksII extends ApplicationAdapter {
    
    long lastTime = System.nanoTime();
    double amountOfTicks = 60.0;
    double ns = 1000000000 / amountOfTicks;
    double delta = 0;
    long timer = System.currentTimeMillis();
    int updates = 0;
    int frames;
    
    private PolygonSpriteBatch batch;
    private ShapeDrawer drawer;
    private TextureRegion region;
    
    public static int WIDTH = 1600, HEIGHT = 900;
    public int fullWidth, fullHeight;
    public static int tileSize = 64;
    public String title = "Tanks II";
    
    public static Handler handler;
    private Level level;
    
    @Override
    public void create() {
        batch = new PolygonSpriteBatch();
        region = new TextureRegion(new Texture(WIDTH, HEIGHT, Format.RGBA8888));
        drawer = new ShapeDrawer(batch, region);
        
        handler = new Handler();
        new Camera(0, 0);
        new InputHandler(this);
        level = new Level(this, handler);
        handler.setLevel(level);
        
        level.load("levels/default/level1.png");
    }
    private void tick() {
        handler.tick();
        Camera.tick();
    }
    @Override
    public void render() {
        long now = System.nanoTime();
        delta += (now - lastTime) / ns;
        lastTime = now;
        while (delta >= 1) {
            tick();
            updates++;
            delta--;
        }
        if (System.currentTimeMillis() - timer > 1000) {
            timer += 1000;
            System.out.println("FPS: " + frames + " TICKS: " + updates);
            frames = 0;
            updates = 0;
        }
        
        // render
        
        ScreenUtils.clear(0, 0, 0, 1);
        batch.begin();
        
        level.render(drawer);
        handler.render(drawer);
        drawer.filledRectangle(10, 10, 100, 100, Color.CYAN);
        
        batch.end();
        frames++;
    }
    @Override
    public void dispose() {
        batch.dispose();
    }
}

问题解决要点 #

• 修复ShapeDrawer的纹理画笔
  当前用空纹理初始化TextureRegion，ShapeDrawer无法正常绘制。替换成1x1的白色纹理：

  @Override
  public void create() {
      batch = new PolygonSpriteBatch();
      // 创建1x1白色纹理作为ShapeDrawer的画笔
      Pixmap pixmap = new Pixmap(1, 1, Pixmap.Format.RGBA8888);
      pixmap.setColor(Color.WHITE);
      pixmap.fill();
      region = new TextureRegion(new Texture(pixmap));
      pixmap.dispose(); // 释放Pixmap资源
      drawer = new ShapeDrawer(batch, region);
      
      // 其他初始化代码...
  }
  

• 应用相机投影矩阵
  创建Camera后未将其矩阵绑定到Batch，导致绘制内容不在视口内。在batch.begin()前添加：

  ScreenUtils.clear(0, 0, 0, 1);
  // 假设Camera类中有OrthographicCamera实例名为camera
  batch.setProjectionMatrix(Camera.camera.combined);
  batch.begin();
  

• 补全资源释放
  在dispose方法中添加纹理的释放，避免内存泄漏：

  @Override
  public void dispose() {
      batch.dispose();
      region.getTexture().dispose();
  }
  

内容的提问来源于stack exchange，提问作者JewishBanana