[英]How do I gain access to an objects variable from another class?
我已經在網上四處張望,有些事情有所幫助,但我仍然無法使它正常工作。 我正在制作一個簡單的乒乓球游戲,但我想要它,因此我的所有代碼都已確定。 所以我有一個關於player1球拍,計算機球拍,球,主屏幕以及比賽屏幕的課程。 因此,例如,我的player1Paddle類將具有該板塊的所有移動,而計算機槳葉類(player2)將具有該板的所有移動,依此類推。 但是,在編碼計算機鍵盤的簡單AI時(基本上從左到右跟隨球),我無法進入球的位置
if(player2Pong.position.x > ballPong.position.x)
它帶來一個錯誤。 現在,我已經實例化了球類,並且它起作用了,但是我基本上制作了另一個球,但是運動不存在。 這是部分代碼,可以嘗試並提供幫助。 我知道有很多代碼,可能還不需要。 在我的playScreen屏幕上,我稱player2movement-
player2Pong.Player2Movement();
這是大多數player2pong類的人。
public class Player2Pong {
public Vector2 position;
String textureLoc;
Texture Player2Texture;
float stateTime;
Rectangle player2Bounds;
String movement;
int speed = 2;
int playerXVector = 5;
SpriteBatch batch;
//PlayerPong playerpong;
Player2Pong player2pong;
Ball ballPong;
public int paddle_player2_Width = 80;
public int paddle_player2_Height = 10;
//PlayerPong player;
public Player2Pong(Vector2 position, Ball ball){
Player2Texture = new Texture(Gdx.files.internal(("paddle_player2.png")));
this.position = position;
player2Bounds = new Rectangle(position.x,position.y,paddle_player2_Width, paddle_player2_Height);
//this.player2pong = player2pong;
this.ballPong = ball;
}
public void update(){
}
public void Player2Movement(){
player2pong = new Player2Pong(new Vector2(Gdx.graphics.getWidth() / 2, Gdx.graphics.getHeight() - (Gdx.graphics.getHeight()/8)), ballPong);
System.out.println(player2pong.position.x);
if(player2pong.position.x > ballPong.getPosition().x){
System.out.println("right");
player2pong.position.x -= playerXVector;
}
else if(player2pong.position.x < ballPong.getPosition().x){
System.out.println("right");
player2pong.position.x += playerXVector;
}
if(player2pong.position.x > Gdx.graphics.getWidth() - player2pong.getPaddle_player2_Width()-5){
player2pong.position.x -= playerXVector;
}
if(player2pong.getPosition().x < 3){
player2pong.position.x += playerXVector;
}
}
public void draw(SpriteBatch batch){
batch.draw(Player2Texture, position.x, position.y, paddle_player2_Width, paddle_player2_Height);
}
這是大部分playScreen類
public class PlayScreenPong implements Screen{
private static final Color WHITE = null;
SpriteBatch batch;
PlayerPong playerPong;
Player2Pong player2Pong;
InputProcessor inputProcessor;
Game game;
Ball ballPong;
Texture paddle_player1, paddle_player2;
ArrayList<Ball> balls;
ArrayList<Player2Pong> player2;
Iterator<Ball> ballsIterator;
Vector2 position;
ShapeRenderer borderSR, ballSR;
Sound sound;
boolean rectangles = true;
Stage PlayScreenStage;
Label label;
LabelStyle style;
BitmapFont font;
int playerXVector = 10;
int player1Score = 0;
int player2Score = 0;
public PlayScreenPong(Game game){
this.game = game;
}
@Override
public void render(float delta) {
Gdx.gl.glClearColor(0,0,0,0);
Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT);
playerPong.update();
//player2Pong.update();
borderSR.begin(ShapeType.Line);
borderSR.rect(1, 1, Gdx.graphics.getWidth()-5, Gdx.graphics.getHeight()-4);
borderSR.setColor(1,1,1,1);
borderSR.end();
batch.begin();
ballsIterator = balls.iterator();
while(ballsIterator.hasNext()){
Ball cur = ballsIterator.next();
cur.update();
cur.draw(batch);
}
batch.draw(playerPong.getPlayerTexture(), playerPong.getPosition().x, playerPong.getPosition().y, playerPong.paddle_player1_Width, playerPong.paddle_player1_Height);
player2Pong.draw(batch);
//batch.draw(player2Pong.getPlayer2Texture(), player2Pong.getPosition().x, player2Pong.getPosition().y, player2Pong.paddle_player2_Width, player2Pong.paddle_player2_Height);
batch.end();
score();
PlayScreenStage.act();
PlayScreenStage.draw();
if(rectangles == true){
ballPong.drawRectangle();
}
player2Pong.Player2Movement();
}
@Override
public void show() {
batch = new SpriteBatch();
paddle_player1 = new Texture(Gdx.files.internal("paddle_player1.png"));
paddle_player2 = new Texture(Gdx.files.internal("paddle_player2.png"));
borderSR = new ShapeRenderer();
balls = new ArrayList<Ball>();
player2 = new ArrayList<Player2Pong>();
if(Gdx.files.local("paddle_player1.dat").exists()){
try {
playerPong = new PlayerPong(new Vector2(Gdx.graphics.getWidth() / 2, Gdx.graphics.getHeight() / 8), "paddle_player1.png");
playerPong.setPosition(PlayerPong.readPlayer());
} catch (ClassNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
System.out.println("File exists, reading file");
}else{
playerPong = new PlayerPong(new Vector2(Gdx.graphics.getWidth() / 2, Gdx.graphics.getHeight() / 8),"paddle_player1.png");
try {
PlayerPong.savePlayer(playerPong);
} catch (IOException e) {
e.printStackTrace();
}
System.out.println("Player doesnt exist, creating and saving player");
}
// player2Pong = new Player2Pong(new Vector2(Gdx.graphics.getWidth() / 2, Gdx.graphics.getHeight() - (Gdx.graphics.getHeight()/8)), playerPong);
// player2.add(player2Pong);
ballPong = new Ball(new Vector2(Gdx.graphics.getWidth()/2,Gdx.graphics.getHeight()/2), playerPong);
balls.add(ballPong);
}
public void score(){
PlayScreenStage = new Stage();
font = new BitmapFont(Gdx.files.internal("font.fnt"), false);
style = new LabelStyle(font, Color.WHITE);
label = new Label("Player 1: " + player1Score + " : " + player2Score + " :Player 2", style);
label.setPosition(Gdx.graphics.getWidth()/2 - label.getWidth()/2, Gdx.graphics.getHeight()/25);
label.setFontScale((float) 0.8);
PlayScreenStage.addActor(label);
Gdx.input.setInputProcessor(PlayScreenStage);
batch = new SpriteBatch();
//System.out.println(ballPong.getPosition().y);
//-------------------------------------if someone scores
if(ballPong.getPosition().y< 1){
player2Score = player2Score +1;
//oppositionScore +=1;
System.out.println("goal");
//ballPong.reset();
}
if(ballPong.getPosition().y > Gdx.graphics.getHeight()-1 -ballPong.getBallSizeY()){
player1Score = player1Score + 1;
//ballPong.reset();
}
}
就像我之前說的那樣,它有點長了,但是我要做的是對AI在player2pong類中的移動,在ball類中的球的移動以及在player類中的球員的移動進行排序,然后調用渲染方法中的方法或播放屏幕類中的顯示方法。 隨意問任何問題。 我知道這是一個簡單的答案,但我是新手:(開始在某個地方
好的,所以,我可能對此有誤,但是值得一試。
首先,您不需要每次調用PlayerMovement()
函數時都創建一個新的Player2pong
對象,您已經有了一個:P
其次,您永遠都不player2Pong
屬性分配任何東西。 因此,當您嘗試在其上調用draw()
時,沒有任何東西可以調用它!
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