[英](updated) How to stop bodies after collision box2d
我期望在碰撞的那一刻,一個body可以移動body2,碰撞后body2會停止。 我嘗試了很多次,通過 ContactListener、地面摩擦和玩家活動狀態來解決這個問題。 不幸的是,我無法解決這個問題。 有誰知道這應該如何工作?
我沒有看到附加代碼的意義,但無論如何我都會這樣做:
public class GameScreen implements Screen {
...
Player player;
Player player2;
@Override
public void show() {
...
world = new World(new Vector2(0, 0f), true);
player = new Player(world);
player2 = new Player(world);
moveDirection = new MoveDirection(player);
shotDirection = new ShotDirection(player);
...
}
@Override
public void render(float delta) {
world.step(1f/60f, 6, 2);
player.update();
player2.update();
...
}
...
}
public class Player {
private final float PIXELS_TO_METERS = 100f;
private Sprite sprite;
private World world;
private Body body;
...
public Body getBody()
public void createBody() {
BodyDef bodyDef = new BodyDef();
bodyDef.type = BodyDef.BodyType.DynamicBody;
bodyDef.fixedRotation = true;
bodyDef.position.set(
sprite.getX() / PIXELS_TO_METERS,
sprite.getY() / PIXELS_TO_METERS
);
body = world.createBody(bodyDef);
CircleShape shape = new CircleShape();
shape.setRadius((long) (20) / PIXELS_TO_METERS);
FixtureDef fixtureDef = new FixtureDef();
fixtureDef.shape = shape;
fixtureDef.density = 0.1f;
body.createFixture(fixtureDef);
shape.dispose();
}
public void update() {
if(!isBodyCreated) {
createBody();
isBodyCreated = true;
}
//Previously used:
/*if(!isActive()) {
body.setLinearVelocity(0, 0);
}*/
...
}
...
}
謝謝閱讀。
編輯:好的,我找到了一個解決方案,但它有延遲,我能做些什么來解決它?
public class GameScreen implements Screen {
...
@Override
public void render(float delta) {
world.step(1f/60f, 6, 2);
player.update();
player2.update();
...
}
...
}
public class MoveDirection extends Actor {
...
addListener(new InputListener() {
...
@Override
public boolean touchDown(InputEvent event, float x, float y, int pointer, int button) {
...
player.setActive(true);
...
}
...
@Override
public void touchUp(InputEvent event, float x, float y, int pointer, int button) {
...
player.setActive(false);
player.getBody().setLinearVelocity(0, 0);
}
...
}
public class Player {
private boolean active = false;
...
public void createBody() {
BodyDef bodyDef = new BodyDef();
bodyDef.type = BodyDef.BodyType.DynamicBody;
bodyDef.fixedRotation = true;
bodyDef.position.set(
(sprite.getX()) / PIXELS_TO_METERS,
(sprite.getY()) / PIXELS_TO_METERS
);
body = world.createBody(bodyDef);
CircleShape shape = new CircleShape();
shape.setRadius((long) (20) / PIXELS_TO_METERS);
fixtureDef = new FixtureDef();
fixtureDef.shape = shape;
fixtureDef.density = 0.1f;
//fixtureDef.restitution = 0;
body.createFixture(fixtureDef);
shape.dispose();
body.setBullet(true);
body.setUserData("player");
}
public void setActive(boolean bool) {
this.active = bool;
}
public boolean isActive() {
return this.active;
}
public boolean isContact() {
boolean isContact = false;
for(Contact contact : world.getContactList()) {
if((contact.getFixtureA().getBody() == this.body || contact.getFixtureB().getBody() == this.body) && (contact.getFixtureA().getBody().getUserData() == "player" && contact.getFixtureB().getBody().getUserData() == "player")) {
isContact = true;
break;
}
}
return isContact;
}
public void update() {
...
if(!isContact() && !isActive()) {
body.setLinearVelocity(0, 0);
}
}
}
我對box2d沒有任何經驗,所以我不能給出詳細的答案。 但也許這就是要實現 EndContact 和 PostSolve 方法的地方。
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