如何让玩家通过相机被摧毁?

问题描述

我在让玩家通过相机被摧毁时遇到了一些麻烦.在我的应用程序中，我让相机跟随玩家(球).但摄像机只能跟随球向上.所以我想要完成的是，当玩家(球)到达界面(屏幕)的底部时，它会被破坏.在它被摧毁之后会很好，如果一个新的活动(新屏幕)弹出，那就是游戏结束".非常感谢您的大力支持.应用界面

I've been having some trouble making the player get destroyed through the camera. In my application, I made the camera follow the player(the ball). But the camera can only follow the ball upward. So what I want to accomplish is, when the player(the ball) reaches the bottom of the interface(the screen) it gets destroyed. After it gets destroyed it would be good, if a new activity(new screen) pops up, that says "Game over". Thanks a lot for the great support. the interface of the application

包 com.luca.tuninga;

package com.luca.tuninga;

import com.badlogic.gdx.ApplicationAdapter;
import com.badlogic.gdx.Gdx;
import com.badlogic.gdx.graphics.GL20;
import com.badlogic.gdx.graphics.Texture;
import com.badlogic.gdx.graphics.OrthographicCamera;
import com.badlogic.gdx.Input;
import com.badlogic.gdx.math.MathUtils;
import com.badlogic.gdx.math.Vector2;
import com.badlogic.gdx.physics.box2d.*;



public class MyGdxGame extends ApplicationAdapter {


public static float APP_FPS = 60f;
public static int V_WIDTH = 480;
public static int V_HEIGHT = 640;


Box2DDebugRenderer b2dr;
World world;
Body ballBody;

OrthographicCamera camera;

float cameraMaxY;

@Override
public void create() {
    world = new World(new Vector2(0, -9.8f), false);
    b2dr = new Box2DDebugRenderer();


    camera = new OrthographicCamera();
    camera.setToOrtho(false, V_WIDTH, V_HEIGHT);
    cameraMaxY = camera.position.y;


    ballBody = createBall();
    createWalls();
}

private void update() {
    world.step(1f / APP_FPS, 6, 2);

    if (Gdx.input.isTouched()) {
        ballBody.setLinearVelocity(0, MathUtils.clamp(ballBody.getLinearVelocity().y, 0, 3));
        ballBody.applyForceToCenter(new Vector2(0, 650f), false);
    }

    if (ballBody.getPosition().y * 32 > cameraMaxY) {
        camera.translate(0, (ballBody.getPosition().y * 32) - cameraMaxY);
        camera.update();

        cameraMaxY = camera.position.y;
    }
}

@Override
public void render() {
    Gdx.gl.glClearColor(.25f, .25f, .25f, 1);
    Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT);

    update();

    b2dr.render(world, camera.combined.cpy().scl(32f));
}

@Override
public void dispose() {
    super.dispose();
    world.dispose();
}

private Body createBall() {
    Body body;
    BodyDef def = new BodyDef();
    def.type = BodyDef.BodyType.DynamicBody;
    def.fixedRotation = true;
    def.position.set(camera.position.x/ 32 + .5f, camera.position.y/ 32);
    def.gravityScale = 3;
    CircleShape shape = new CircleShape();
    shape.setRadius(.5f);

    body = world.createBody(def);
    body.createFixture(shape, 1.0f);
    return body;

}

private void createWalls() {
    Body body;
    BodyDef def = new BodyDef();
    def.type = BodyDef.BodyType.StaticBody;
    def.fixedRotation = true;

    PolygonShape shape = new PolygonShape();
    shape.setAsBox(1, 200 / 32);
    for(int i = 0; i < 20 ; i++) {
        def.position.set(1.01f, i * (200 / 32));
        body = world.createBody(def);
        body.createFixture(shape, 1.0f);

        def.position.set(V_WIDTH / 32 - 1, i * (200 / 32));
        body = world.createBody(def);
        body.createFixture(shape, 1.0f);
    }
 }

}

推荐答案

据我了解，相机只会向上跟随.因此，当球向上过渡时，相机会更新并跟随，相机不会再次下降.

From what I understand, the camera will follow upwards only. Thus when the ball transitions into upwards position, camera will update and follow through, camera won't go down again.

这样您就可以检查球何时不在摄像机的视线范围内；特别是相机的底部.

So you can check when the ball is outside of the sight of camera; specifically the bottom of camera.

你可以把它放在 update() 函数的末尾

You can do something like this putting it at the end of update() function

if ((ballBody.getPosition().y + 0.5f) * 32 < ballBody.getPosition().y -
    camera.getViewportHeight()/2) {
    // destroy body
    world.destroyBody(ballBody);

    // TODO: switch to another screen (thus next frame update & draw loop of this screen won't be called anymore)
}

上面是检查球何时完全不在相机的视线范围内(因此我做了 + 0.5f 这是它的半径，因为你用来创建这样的形状body) 相对于相机的视口高度.

above is to check if when ball is completely out of camera's sight (thus I do + 0.5f which is its radius as you used to create the shape for such body) against camera's viewport height.

然后切换到另一个屏幕.这意味着当前屏幕将不再更新或绘制其内容，因此无需检查标志.但是如果下一帧还需要做其他的事情，最好有一个flag检查当前画面，知道游戏已经结束，这样就可以判断是否做某些操作了.

Then switch to another screen. This means the current screen won't be update or draw its content anymore, thus no need to have a flag to check. But if you need to do something else again in next frame, you better have a flag checking for the current screen to know that the game is now over, and thus you can check whether to do certain operations.

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