项目:我一直在使用libgdx-box2d的一个小项目，我想创建一个对象，渲染到屏幕上，并应用重力到它，使它与地面碰撞。我目前正在做的部分是创建和渲染身体。
问题:问题是，当我运行项目时，我创建的主体没有显示在屏幕上，我觉得我已经正确地创建了主体，因为没有编译问题。
What i tried:
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我尝试了很多事情，比如增加我的圆的半径到放大(更明显)
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通过
camera = new OrthographicCamera(Gdx.graphics.getWidth() /10, Gdx.graphics.getHeight() /10);放大到屏幕，如果它是太小了，看不见，但不管我怎么尝试，我创建的对象 -
将body的位置更改为不同的x,y位置
我想要的结果:我想要的是可能得到一个答案，为什么我创建的身体没有被显示，并在渲染它的一些帮助，以便它可以被看到。我希望我提出的问题的结构是清晰的和有信息的。提前感谢大家的帮助
这是我的相关代码:
package com.mohamed.JungleFighter;
import com.badlogic.gdx.Game;
import com.badlogic.gdx.Gdx;
import com.badlogic.gdx.Input;
import com.badlogic.gdx.graphics.GL20;
import com.badlogic.gdx.graphics.OrthographicCamera;
import com.badlogic.gdx.graphics.Texture;
import com.badlogic.gdx.graphics.g2d.Sprite;
import com.badlogic.gdx.graphics.g2d.SpriteBatch;
import com.badlogic.gdx.graphics.g2d.TextureRegion;
import com.badlogic.gdx.math.Vector2;
import com.badlogic.gdx.physics.box2d.BodyDef;
import com.badlogic.gdx.physics.box2d.BodyDef.BodyType;
import com.badlogic.gdx.physics.box2d.Box2DDebugRenderer;
import com.badlogic.gdx.physics.box2d.CircleShape;
import com.badlogic.gdx.physics.box2d.Fixture;
import com.badlogic.gdx.physics.box2d.FixtureDef;
import com.badlogic.gdx.physics.box2d.World;
import com.sun.xml.internal.ws.wsdl.writer.document.soap.Body;
//i'm extending libgdx's built in game class which implements the activity listener
public class JungleFighterMain extends Game {
private OrthographicCamera camera;
private SpriteBatch sBatch;
private Texture player;
private Texture enemy;
//private SpriteBatch enemyBatch;
private Sprite sprite1;
private Sprite sprite2;
//just setting my game heighty and width
public static int gameWidth = 1280, gameHeight = 720;
private World world;
private Box2DDebugRenderer debugRenderer;
p
@Override
public void create () {
//camera related
camera = new OrthographicCamera(Gdx.graphics.getWidth() /10, Gdx.graphics.getHeight() /10);
//end of camera related
//BOX2D CODE FOR CREATING WWORLD
World world = new World(new Vector2(0, -10), true);
//creating box2d body definition
BodyDef bodyDef = new BodyDef();
//setting body type to dynamic
bodyDef.type = BodyType.DynamicBody;
//position
bodyDef.position.set(0, 0);
//sending what i just made to the world i created
// making a circle with a radius of 6
CircleShape circle = new CircleShape();
circle.setRadius(30f);
//making my fixtures for the circle
FixtureDef fixtureDef = new FixtureDef();
fixtureDef.shape = circle;
fixtureDef.density = 0.5f;
fixtureDef.friction = 0.4f;
//making it bounce a little
fixtureDef.restitution = 0.6f;
//addding fixture attributes to my ball
//Fixture fixture = body.createFixture(fixtureDef);
//end of creating my circle ball
//creating my actual ball in the world
world.createBody(bodyDef).createFixture(fixtureDef);
circle.dispose();
//GROUND START
BodyDef bodyGround = new BodyDef();
bodyGround.type = BodyType.StaticBody;
bodyGround.position.set(-100,-100);
//setting shape of ground
ChainShape groundShape = new ChainShape();
groundShape.createChain(new Vector2[] {new Vector2(-250, 0), new Vector2(250, 0)});
//fixtures for ground
FixtureDef fixtureDefGround = new FixtureDef();
fixtureDefGround.shape = groundShape;
fixtureDefGround.friction = 0.5f;
fixtureDefGround.restitution = 0;
world.createBody(bodyGround).createFixture(fixtureDefGround);
groundShape.dispose();
}
public void dispose() {
world.dispose();
}
public void render (float delta) {
Gdx.gl.glClearColor(0, 0, 0, 1);
Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT);
// camera related
sBatch.setProjectionMatrix(camera.combined);
debugRenderer.render(world, camera.combined);
world.step(TIMESTEP, VELOCITYITERATIONS, POSITIONITERATIONS);
}
}
public void resize(int width, int height){
}
public void pause(){
}
public void resume(){
}
}
在Java中仅仅声明一个对象是不够的，就像:
private Box2DDebugRenderer debugRenderer
您还需要实例化它，否则它是一个空引用。尝试添加
debugRenderer = new Box2DDebugRenderer()
到您的create函数，以避免您在注释中提到的错误。构造函数也可以接受一些参数，但我不熟悉Box2D或LibGDX。
好，经过几个小时的研究，我终于意识到我需要添加相机。viewporttheight =;相机。viewportWidth;camera.position.set(相机。viewportWidth camera.viewportHeight);——