物体如何通过摄像机视线被破坏？

问题描述：

我一直有一些麻烦，使玩家通过相机被摧毁。在我的应用程序中，我让相机跟随玩家（球）。但相机只能跟随球向上。所以我想要完成的是，当玩家（球）到达界面底部（屏幕）时，它会被破坏。如果新的活动（新屏幕）弹出，说“游戏结束”，它被破坏后会很好。非常感谢大力支持。请大家看看interface of the application.物体如何通过摄像机视线被破坏？

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.World; 
import com.badlogic.gdx.physics.box2d.Box2DDebugRenderer; 
import com.badlogic.gdx.physics.box2d.Body; 
import com.badlogic.gdx.physics.box2d.BodyDef; 
import com.badlogic.gdx.physics.box2d.CircleShape; 
import com.badlogic.gdx.physics.box2d.PolygonShape; 
import com.badlogic.gdx.utils.viewport.Viewport; 


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.position.set(camera.position.x, camera.position.y); 
    def.gravityScale = 3; 
    CircleShape shape = new CircleShape(); 
    shape.setRadius(0.5f); 

    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); 
    } 
} 

}

你为什么要转发同一个问题？ –

我再次发布相同的问题，因为上次答案很好，但是有一个错误，所以我不能退出找出我应该做的事情。 – Luca

没关系。您不会重复发布重复的问题。如果你想澄清，评论。 –

答

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

    if (ballBody.getPosition().y < camera.position.y){ 
     destroyBall(); 
    } else if (ballBody.getPosition().y > camera.position.y + 300){ 
     camera.position.set(ballBody.getPosition().y - 300); 
    } 

    update(); 

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

我希望这个作品。你可以自己写destroyBall()方法。

谢谢，它确实有效。但我应该问你怎么写destroyBall方法，因为我的方式并不总是工作。 – Luca

物体如何通过摄像机视线被破坏？

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