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私は蛇のゲームを作りました。そして、蛇と食べ物の間に衝突があるとき、それはスコアに1を加えることになっています。その代わりに、ヘビが食べ物を食べたら何が起こるか、複数のポイントが追加されます。リンゴには複数の器具が付いています（おそらく複数の衝突が検出されているためです）。スコアが1ポイントだけ上がることを確認する方法はありますか？いくつかのアイデアが参考になるでしょう。複数の衝突とスコアの維持
ブール値を使用して、食品の再配置が完了しても問題が解決されない限り、衝突が登録されていないことを確認しました。
コード：（関連性のないコードの中には人がいないので、オブジェクトのポリゴンシェイプの頂点のベクトル2のリストがあります）
Apple.java：
public class Apple {
private Sprite img;
private float width, x, y;
private Body body;
private Vector2[][] vertices;
public boolean isRelocating;
private Vector2 previousPosition;
//constructor
public Apple(float x, float y, float width, World world) {
this.x = x;
this.y = y;
this.width = width;
isRelocating = false;
//intialize previous number to a mechncially imposible number
previousPosition = new Vector2(-100, -100);
img = new Sprite(new Texture(Gdx.files.internal("Emoji/Red Apple.png")));
img.setSize(width, width * 0.9416f);
img.setPosition(x, y);
//set up the physics body
BodyDef def = new BodyDef();
def.type = BodyDef.BodyType.DynamicBody; //keep it dynamic so collisions can be collected
def.position.set(x, y);
body = world.createBody(def);
loadVertices();
//scale vertices accroding to the width
for (int i = 0; i < vertices.length; i++) {
for (int j = 0; j < vertices[i].length; j++) {
vertices[i][j].scl(width);
}
}
//attach multiple fixtures to the body
FixtureDef fixtureDef = new FixtureDef();
PolygonShape shape = new PolygonShape();
fixtureDef.isSensor = true;
shape.set(vertices[0]);
}
public void update(float dt) {
img.setPosition(x, y);
body.setTransform(x, y, body.getAngle());
}
public void draw(SpriteBatch batch) {
batch.begin();
img.setAlpha(0.1f);
img.draw(batch);
batch.end();
}
public void changePosition(float newX, float newY) {
x = newX;
y = newY;
body.setTransform(x,y,body.getAngle());
isRelocating = false;
}
public float getWidth(){
return img.getWidth();
}
public float getHeight(){
return img.getHeight();
}
public Vector2 getPosition(){
return new Vector2(x,y);
}
public Vector2 getPreviousPosition(){
return previousPosition;
}
public void setPreviousPosition(Vector2 value){
previousPosition = value;
}
}
Snake.java：
public class Snake {
private ArrayList<Segment> snake;
private float speed;
private World worldRef;
private float width;
public Snake(float x, float y, float width, float speed, World world) {
snake = new ArrayList<Segment>();
this.speed = speed;
worldRef = world;
//add the head
snake.add(new Segment(width, x, y, true, Segment.Direction.UP, speed, world));
}
public void draw(SpriteBatch batch){
for (int i = 0; i < snake.size(); i ++){
snake.get(i).draw(batch);
}
}
public void update(float dt){
for (int i = 0; i < snake.size(); i ++){
snake.get(i).update(dt);
}
}
public void changeDirection(Segment.Direction direction){
//change the direction of the head, and the rest will follow
snake.get(0).setDirection(direction);
}
public Rectangle[] getTakeArea(){
Rectangle[] rects = new Rectangle[snake.size()];
for (int i = 0; i < rects.length; i ++){
rects[i] = snake.get(i).getArea();
}
return rects;
}
public float getWidth(){
return width;
}
}
Segment.java：
public class Segment {
//direction enum
public enum Direction {
UP,
DOWN,
LEFT,
RIGHT;
}
private Sprite img;
private float width, x, y;
private Body body;
private float speed;
private Direction direction;
private boolean isHead;
private Vector2[] vertices1;
private Vector2[] vertices2;
private Vector2[] vertices3;
private Vector2[] vertices4;
//constructor
public Segment(float width, float x, float y, boolean isHead, Direction
direction, float speed, World world) {
this.width = width;
this.x = x;
this.y = y;
this.direction = direction;
this.speed = speed;
this.isHead = isHead;
if (isHead)
img = new Sprite(new Texture(Gdx.files.internal("Emoji/Tears of Joy.png")));
else
img = new Sprite(new Texture(Gdx.files.internal("Emoji/Smiling Face with Mouth Open" +
".png")));
img.setSize(width, width);
img.setPosition(x, y);
//load up the physcis
BodyDef bodyDef = new BodyDef();
bodyDef.position.set(x, y);
bodyDef.type = BodyDef.BodyType.DynamicBody;
body = world.createBody(bodyDef);
//load up fixtures
loadVertices();
for (int i = 0; i < vertices1.length; i++) {
vertices1[i].scl(width);
vertices2[i].scl(width);
vertices3[i].scl(width);
vertices4[i].scl(width);
}
FixtureDef fixtureDef = new FixtureDef();
fixtureDef.friction = 0;
fixtureDef.restitution = 1;
PolygonShape shape1 = new PolygonShape();
shape1.set(vertices1);
fixtureDef.shape = shape1;
body.createFixture(fixtureDef);
shape1.dispose();
//add userData to all the fixtures
for (int i = 0; i < body.getFixtureList().size; i++) {
body.getFixtureList().get(i).setUserData(new UserData("segment"));
}
}
public void update(float dt) {
//update the position based on the speed
switch (direction) {
case UP:
body.setLinearVelocity(0, speed);
break;
case DOWN:
body.setLinearVelocity(0, -speed);
break;
case RIGHT:
body.setLinearVelocity(speed, 0);
break;
case LEFT:
body.setLinearVelocity(-speed, 0);
break;
}
//make sure that the segment stays in side the camara
if (x > (Launcher.WIDTH/SnakeMain.PPM))
body.setTransform(x - (Launcher.WIDTH/SnakeMain.PPM) - width,y, body.getAngle());
x = body.getPosition().x;
y = body.getPosition().y;
//have to adjust the sprite if it is head
if (isHead) {
img.setPosition(x - (width * 0.03f), y - (width * 0.024f));
} else {
img.setPosition(x, y);
}
img.setRotation((float) Math.toDegrees(body.getAngle()));
}
public void draw(SpriteBatch batch) {
batch.begin();
img.setAlpha(0.1f);
img.draw(batch);
batch.end();
}
public Direction getDirection() {
return direction;
}
public Rectangle getArea(){
return new Rectangle(x,y,width,width);
}
public void setDirection(Direction newDirection) {
direction = newDirection;
}
}
SnakeMain.java：
public class SnakeMain implements Screen {
private Launcher mainRef;
private OrthographicCamera camera;
private FitViewport viewport;
private World world;
private Box2DDebugRenderer debugRenderer;
public static final float PPM = 100;
private Snake snake;
private Apple apple;
private Stage HUD;
private Table hubTable;
private Label lblScore;
private int score = 0;
//constructor
public SnakeMain(Launcher main) {
mainRef = main;
camera = new OrthographicCamera();
viewport = new FitViewport(Launcher.WIDTH/PPM, Launcher.HEIGHT/PPM, camera);
viewport.apply();
world = new World(new Vector2(0, 0), true);
debugRenderer = new Box2DDebugRenderer();
snake = new Snake((Launcher.WIDTH/2)/PPM, (Launcher.HEIGHT/2)/PPM, 200/PPM, 400
/PPM, world);
apple = new Apple((Launcher.WIDTH/2)/PPM, (Launcher.HEIGHT/2 - 300)/PPM, 200/PPM,
world);
world.setContactListener(new CollisionDetector(this));
Gdx.input.setInputProcessor(new GestureDetector(new TouchListener(snake)));
HUD = new Stage();
HUD.setViewport(new FitViewport(Launcher.WIDTH /3, Launcher.HEIGHT/3, new OrthographicCamera
()));
hubTable = new Table();
String strScore = "Score: " + score;
lblScore = new Label(strScore, mainRef.getSkin(), "small38");
hubTable.add(lblScore);
hubTable.top();
hubTable.padTop(10);
hubTable.setFillParent(true);
HUD.addActor(hubTable);
}
@Override
public void show() {
}
public void update(float delta) {
world.step(1/30f, 6, 2);
snake.update(delta);
apple.update(delta);
lblScore.act(delta);
HUD.act();
}
@Override
public void render(float delta) {
update(delta);
debugRenderer.render(world, camera.combined);
mainRef.batch.setProjectionMatrix(camera.combined);
snake.draw(mainRef.batch);
apple.draw(mainRef.batch);
HUD.draw();
}
public Apple getApple(){
return apple;
}
//handles things when the snake eats the food
public void foodEaten() {
score ++;
String strScore = "Score: " + score;
lblScore.setText(strScore);
//relocate the food to a new location
boolean isValid = false;
float newX = -1;
float newY = -1;
Rectangle rect = new Rectangle();
while (!isValid) {
newX = (float) Math.random() * (Launcher.WIDTH - apple.getWidth() * PPM);
newY = (float) Math.random() * (Launcher.HEIGHT - apple.getHeight() * PPM);
rect.set(newX, newY, apple.getWidth(), apple.getHeight());
isValid = true;
//check to make sure that the apple will not be in the same position as the snake
for (int i = 0; i < snake.getTakeArea().length; i++) {
if (rect.overlaps(snake.getTakeArea()[i])) {
isValid = false;
}
}
}
apple.changePosition(newX/PPM, newY/PPM);
Gdx.app.log("SnakeMain.java", "Done relocating the apple");
}
@Override
public void resize(int width, int height) {
viewport.update(width, height, true);
HUD.getViewport().update(width,height,true);
}
@Override
public void pause() {
}
@Override
public void resume() {
}
@Override
public void hide() {
}
@Override
public void dispose() {
}
}
CollisionDetector.java：
public class CollisionDetector implements ContactListener {
private SnakeMain mainRef;
//constructor
public CollisionDetector(SnakeMain main) {
mainRef = main;
}
@Override
public void beginContact(Contact contact) {
try {
UserData userData1 = (UserData) contact.getFixtureA().getUserData();
UserData userData2 = (UserData) contact.getFixtureB().getUserData();
//if there is a collision between an apple and a segment
if ((userData1.getId() == "apple" && userData2.getId() == "segment")
|| (userData1.getId() == "segment" && userData2.getId() == "apple")) {
if (!mainRef.getApple().isRelocating) {
Gdx.app.log("Apple eaten", "About to reset Apple");
Gdx.app.log("Apple eaten", "State of apple: " + mainRef.getApple()
.isRelocating);
mainRef.getApple().isRelocating = true;
mainRef.foodEaten();
}
}
} catch (Exception e) {
Gdx.app.log("Error!", e.getMessage());
}
}
@Override
public void postSolve(Contact contact, ContactImpulse impulse) {
}
@Override
public void endContact(Contact contact) {
}
@Override
public void preSolve(Contact contact, Manifold oldManifold) {
}
}