我的精灵移动得太慢了。基本上我想减少用力来移动我的玩家。目前这个：
getBody().applyForceToCenter(new Vector2(-10000000f,0f), true);
是使它移动一点所需的力量。
我知道我无法移动它的原因是因为我没有缩放精灵（64x64）它的重量超过400公斤。什么应该是正确的比例？
这是我的游戏画面。
public class GameScreen implements Screen {
//Reference to our Game, used to set Screens
private Logang game;
//basic playscreen variables
private OrthographicCamera gamecam;
private Viewport gamePort;
//Box2d variables
private World world;
private Box2DDebugRenderer b2dr;
boolean drawn = true;
private Player p;
private int pX = 100, pY = 300;
public GameScreen(Logang game) {
this.game = game;
//create cam used to follow mario through cam world
gamecam = new OrthographicCamera();
gamePort = new ScalingViewport(Scaling.stretch, Logang.GWIDTH, Logang.GHEIGHT, gamecam);
gamePort.apply();
gamecam.position.set(gamecam.viewportWidth / 2, gamecam.viewportHeight / 2, 0);
gamecam.update();
Box2D.init();
//create our Box2D world, setting no gravity in X, -10 gravity in Y, and allow bodies to sleep
world = new World(new Vector2(0, Logang.GRAVITY), true);
//allows for debug lines of our box2d world.
b2dr = new Box2DDebugRenderer();
//create a FitViewport to maintain virtual aspect ratio despite screen size
p = new Player(new Sprite(new Texture("hud_p3.png")), world, pX, pY, 1);
//initially set our gamcam to be centered correctly at the start of of map
line();
}
@Override
public void show() {
}
public void update(float dt) {
//handle user input first
p.update(dt);
//update our gamecam with correct coordinates after changes
}
@Override
public void render(float delta) {
//separate our update logic from render
update(delta);
//Clear the game screen with Black
Gdx.gl.glClearColor(0, 0, 0, 1);
Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT);
world.step(1f / 60f, 6, 2);
gamecam.position.set(p.getSprite().getX(),Logang.GHEIGHT / 2, 0); // x and y could be changed by Keyboard input for example
gamecam.update();
game.getBatch().setProjectionMatrix(gamecam.combined);
//renderer our Box2DDebugLines
b2dr.render(world, gamecam.combined);
System.out.println("Player x: " + p.getSprite().getX() + " Camera X: " + gamecam.position.x + " Body X: " + p.getBody().getPosition().x);
//System.out.println("Player y: " + p.getSprite().getY() + " Camera Y: " + gamecam.position.y + " Body Y: " + p.getBody().getPosition().y);
game.getBatch().begin();
if (p.getBody() != null)
p.render(game.getBatch());
EntityManager.renderTerra(game.getBatch(), delta);
game.getBatch().end();
}
public void line() {
Texture tmp = new Texture("hud_p3.png");
tmp.setWrap(Texture.TextureWrap.MirroredRepeat, Texture.TextureWrap.MirroredRepeat);
for (int i = 0; i < 50; i++) {
EntityManager.add(new Ground(new Sprite(tmp), world, (int)(i * Logang.TILE), 1, 2));
}
// EntityManager.changeSize(((Logang.TILE) * 5),Logang.TILE);
}
@Override
public void resize(int width, int height) {
//updated our game viewport
gamePort.update(width, height);
gamecam.position.set(gamecam.viewportWidth / 2, gamecam.viewportHeight / 2, 0);
}
public World getWorld() {
return world;
}
@Override
public void pause() {
}
@Override
public void resume() {
}
@Override
public void hide() {
}
@Override
public void dispose() {
world.dispose();
b2dr.dispose();
}
这是我的实体类
private World world;
private Sprite sprite;
private Body body;
private int tipo;
public Entity(Sprite sprite, World world, int x, int y, int tipo) {
this.sprite = sprite;
this.world = world;
getSprite().setPosition(x, y);
sprite.setSize(Logang.TILE, Logang.TILE);
sprite.setOriginCenter();
define(tipo);
this.tipo = tipo;
}
public void update(float dt){
if(Gdx.input.isKeyPressed(Input.Keys.LEFT)){
getBody().applyForceToCenter(new Vector2(-10000000f,0f), true);
}
if(Gdx.input.isKeyPressed(Input.Keys.RIGHT)){
getBody().applyForceToCenter(new Vector2(10000000f,0f), true);
}
if(Gdx.input.isKeyPressed(Input.Keys.SPACE)){
//getBody().applyLinearImpulse(0f,-Logang.GRAVITY,
getBody().getPosition().x, getBody().getPosition().y, true);
}
}
public void define(int tipo) {
BodyDef bdef = new BodyDef();
bdef.position.set((getSprite().getX() + getSprite().getWidth() / 2),
(getSprite().getY() + getSprite().getHeight() / 2));
switch (tipo) {
case 1: {
bdef.type = BodyDef.BodyType.DynamicBody;
break;
}
case 2: {
bdef.type = BodyDef.BodyType.StaticBody;
break;
}
case 3: {
bdef.type = BodyDef.BodyType.DynamicBody;
break;
}
}
body = world.createBody(bdef);
FixtureDef fdef = new FixtureDef();
fdef.density=0.001f; // (weight: range 0.01 to 1 is good)
PolygonShape shape = new PolygonShape();
shape.setAsBox(getSprite().getWidth() / 2, getSprite().getHeight() / 2);
fdef.shape = shape;
body.createFixture(fdef);
body.setUserData(this);
shape.dispose();
}
public void render(SpriteBatch batch) {
if (tipo != 2) {
float posX = getBody().getPosition().x;
float posY = getBody().getPosition().y;
getSprite().setPosition(posX - getSprite().getWidth() / 2, posY -
getSprite().getHeight() / 2);
}
getSprite().draw(batch);
}
public Sprite getSprite() {
return sprite;
}
public void setSprite(Sprite sprite) {
this.sprite = sprite;
}
public Body getBody() {
return body;
}
public void setBody(Body body) {
this.body = body;
}
这是游戏中的变量
public static final int GWIDTH = 800;
public static final int GHEIGHT = (GWIDTH/16)*9;
public static final float PPM = 100f;
public static final float GRAVITY = -10f;
public static final float TILE = 64;
答案 0 :(得分：1)
What should be the correct scale?
The right scale would be the scale in real life where 1 unit in LibGDX (Box2D) represents 1 meter in real life. I always advice people to use this scale and zoom the camera properly.
Mind though, if you are using very large objects and zoom the camera all the way back objects appear to be falling slowly. This is obviously because your camera contains a much larger space. Not only would it fall slowly but it won't interact properly with the world if the item is supposed to be smaller.
Adept the camera to your world, not your world to your camera.