我对libgdx还不太熟悉。基本上我创建了一个球在弹跳的世界，并正在进行一些实验。之前，我的摄像机位置是固定的：
现在，在渲染方法中增加了以下代码行，使得摄像机始终跟随玩家（即圆形）：
camera.position.set(player.getPosition().x, player.getPosition().y, 0);
玩家是一种身体类型。因此，当我这样做时，它会跟随玩家，但形状渲染器现在表现出奇怪的行为。看看发生了什么：http://prntscr.com/567i9a。尽管我将相机和形状渲染器与玩家的同一位置进行比较，但它们并不处于相同的位置。以下是我的代码：
public class Game extends ApplicationAdapter {
World world = new World(new Vector2(0, -9.8f), true);
Box2DDebugRenderer debugRenderer;
OrthographicCamera camera;
static final int PPM = 100;
static float height,width;
Body player;
RayHandler handler;
PointLight l1;
ShapeRenderer shapeRenderer;
@Override
public void create() {
shapeRenderer = new ShapeRenderer();
height = Gdx.graphics.getHeight();
width = Gdx.graphics.getWidth();
//set camera
camera = new OrthographicCamera();
camera.setToOrtho(false, (width)/PPM/2, (height)/PPM/2);
camera.update();
//Ground body
BodyDef groundBodyDef =new BodyDef();
groundBodyDef.position.set(new Vector2(width/PPM/2/2, 0));
Body groundBody = world.createBody(groundBodyDef);
PolygonShape groundBox = new PolygonShape();
groundBox.setAsBox((width/PPM/2/2), 0.1f);
groundBody.createFixture(groundBox, 0.0f);
//wall left
BodyDef wallLeftDef = new BodyDef();
wallLeftDef.position.set(0, 0f);
Body wallLeftBody = world.createBody(wallLeftDef);
PolygonShape wallLeft = new PolygonShape();
wallLeft.setAsBox(width/PPM/20/2, height/PPM/2);
wallLeftBody.createFixture(wallLeft,0.0f);
//wall right
BodyDef wallRightDef = new BodyDef();
wallRightDef.position.set((width/PPM)/2, 0f);
Body wallRightBody = world.createBody(wallRightDef);
PolygonShape wallRight = new PolygonShape();
wallRight.setAsBox(width/PPM/20/2, height/PPM/2);
wallRightBody.createFixture(wallRight,0.0f);
//Dynamic Body
BodyDef bodyDef = new BodyDef();
bodyDef.type = BodyType.DynamicBody;
bodyDef.position.set((width/PPM)/2/2, (height / PPM)/2/2);
player = world.createBody(bodyDef);
CircleShape dynamicCircle = new CircleShape();
dynamicCircle.setRadius(5f/PPM);
FixtureDef fixtureDef = new FixtureDef();
fixtureDef.shape = dynamicCircle;
fixtureDef.density = 0.4f;
fixtureDef.friction = 0.2f;
fixtureDef.restitution = 0.6f;
player.createFixture(fixtureDef);
debugRenderer = new Box2DDebugRenderer();
//Lighting
handler = new RayHandler(world);
handler.setCombinedMatrix(camera.combined);
PointLight l1 = new PointLight(handler,5000,Color.CYAN,width/PPM/2,width/PPM/2/2/2,height/PPM/2/2);
new PointLight(handler,5000,Color.PURPLE,width/PPM/2,width/PPM/2/1.5f,height/PPM/2/2);
shapeRenderer.setProjectionMatrix(camera.combined);
}
public void update() {
if(Gdx.input.isKeyJustPressed(Keys.UP)) {
player.applyForceToCenter(0, 0.75f, true);
}
if(Gdx.input.isKeyJustPressed(Keys.RIGHT)) {
player.applyForceToCenter(0.5f, 0f, true);
}
if(Gdx.input.isKeyJustPressed(Keys.LEFT)) {
player.applyForceToCenter(-0.5f, 0f, true);
}
}
@Override
public void dispose() {
}
@Override
public void render() {
Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT);
debugRenderer.render(world, camera.combined);
world.step(1/60f, 6, 2);
handler.updateAndRender();
shapeRenderer.begin(ShapeType.Filled);
shapeRenderer.setColor(1, 1, 1, 1);
shapeRenderer.circle(player.getPosition().x, player.getPosition().y, 5f/PPM, 100);
shapeRenderer.end();
camera.position.set(player.getPosition().x, player.getPosition().y, 0);
camera.update();
update();
}
@Override
public void resize(int width, int height) {
}
@Override
public void pause() {
}
@Override
public void resume() {
}
}