創建多個矩形java libgdx

Question

你好，我是新來的libgdx和java，我有一個屏幕上創建多個對象的問題。當我點擊空間，我想從類Pocisk有一個新的對象屏幕矩形，但是當我點擊它只要走下去。

遊戲類

public class Gra extends ApplicationAdapter { 
    SpriteBatch batch; 
    private Texture Statektekstura,Pocisktekstura; 
    private Statek statek; 
    private Pocisk pocisk; 

    @Override 
    public void create() { 
     zaladujdane(); 
     init(); 
    } 

    private void init() { 
     batch=new SpriteBatch(); 
     statek=new Statek(Statektekstura); 
     pocisk=new Pocisk(Pocisktekstura); 
    } 

    private void zaladujdane() { 
     //tekstura statku pomniejszana 
     Pixmap pixmap2 = new Pixmap(Gdx.files.internal("statek.jpg")); 
     Pixmap pixmap1 = new Pixmap(100, 100, pixmap2.getFormat()); 
     pixmap1.drawPixmap(pixmap2, 
       0, 0, pixmap2.getWidth(), pixmap2.getHeight(), 
       0, 0, pixmap1.getWidth(), pixmap1.getHeight() 
     ); 
     Statektekstura=new Texture(pixmap1); 

     //tekstura pocisk pomniejszona 
     Pixmap pixmap20 = new Pixmap(Gdx.files.internal("pocisk.jpg")); 
     Pixmap pixmap10 = new Pixmap(35, 35, pixmap20.getFormat()); 
     pixmap10.drawPixmap(pixmap20, 
       0, 0, pixmap20.getWidth(), pixmap20.getHeight(), 
       0, 0, pixmap10.getWidth(), pixmap10.getHeight() 
     ); 

     Pocisktekstura=new Texture(pixmap10); 
    } 

    @Override 
    public void render() { 
     udpdate(); 
     Gdx.gl.glClearColor(1, 1, 1, 1); 
     Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT); 
     batch.begin(); 
     statek.draw(batch); 
     pocisk.draw(batch); 

     batch.end(); 
    } 

    private void udpdate() { 
     przesuwanie(); 
     pocisk.y=pocisk.y+pocisk.pociskpredkosc*Gdx.graphics.getDeltaTime();   
    } 

    private void przesuwanie() { 
     if(Gdx.input.isKeyPressed(Keys.A)) 
     { 
      statek.x=statek.x-250*Gdx.graphics.getDeltaTime(); 
     } 
     if(Gdx.input.isKeyPressed(Keys.D)) 
     { 
      statek.x=statek.x+250*Gdx.graphics.getDeltaTime(); 
     } 
     if(Gdx.input.isKeyPressed(Keys.SPACE)) 
     { 

      pocisk=new Pocisk(Pocisktekstura); 
      pocisk.strzal();  
     }  
    } 

    @Override 
    public void dispose() { 
     //batch.dispose(); 
    } 
} 

類Pocisk代碼：

public class Pocisk extends Rectangle { 

    private Texture texture; 
    public float pociskpredkosc=0; 

    Pocisk(Texture texture) 
    { 
     this.texture=texture; 
     this.height=texture.getHeight(); 
     this.width=texture.getWidth(); 
    } 

    public void draw(SpriteBatch batch) 
    { 
     batch.draw(texture, x, y); 
    } 

    public void strzal() 
    { 
     pociskpredkosc=pociskpredkosc+80; 
    } 
} 

我覺得我沒有在課堂上GRA不上課Pocisk我應該怎麼改變，使一個新的Rectangle總是當我點擊空間？

Answer 1

您正在處理單個pocisk參考，每次創建新對象並引用pocisk變量時。由該變量執行Pocisk更新，以便每次pocisk從初始位置開始。對於多個pocisk，您需要保留所有對象引用並對該引用執行更新，因此請使用任何容器來存儲所有引用。您可以使用Array。

public class MainGame extends ApplicationAdapter { 
    SpriteBatch batch; 
    private Texture Statektekstura,Pocisktekstura; 
    private Statek statek; 
    Array<Pocisk> pociskList; 
    boolean oneAtOnce; 

    @Override 
    public void create() { 
     zaladujdane(); 
     init(); 
    } 

    private void init() { 
     batch=new SpriteBatch(); 
     statek=new Statek(Statektekstura); 
     pociskList=new Array<Pocisk>(); 
    } 

    private void zaladujdane() { 
     //tekstura statku pomniejszana 
     Pixmap pixmap2 = new Pixmap(Gdx.files.internal("badlogic.jpg")); 
     Pixmap pixmap1 = new Pixmap(100, 100, pixmap2.getFormat()); 
     pixmap1.drawPixmap(pixmap2, 
       0, 0, pixmap2.getWidth(), pixmap2.getHeight(), 
       0, 0, pixmap1.getWidth(), pixmap1.getHeight() 
     ); 
     Statektekstura=new Texture(pixmap1); 

     //tekstura pocisk pomniejszona 
     Pixmap pixmap20 = new Pixmap(Gdx.files.internal("badlogic.jpg")); 
     Pixmap pixmap10 = new Pixmap(35, 35, pixmap20.getFormat()); 
     pixmap10.drawPixmap(pixmap20, 
       0, 0, pixmap20.getWidth(), pixmap20.getHeight(), 
       0, 0, pixmap10.getWidth(), pixmap10.getHeight() 
     ); 

     Pocisktekstura=new Texture(pixmap10); 
    } 

    @Override 
    public void render() { 
     udpdate(); 
     Gdx.gl.glClearColor(1, 1, 1, 1); 
     Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT); 
     batch.begin(); 
     statek.draw(batch); 
     for(Pocisk pocisk:pociskList) 
      pocisk.draw(batch); 

     batch.end(); 
    } 

    private void udpdate() { 
     przesuwanie(); 
     for (Pocisk pocisk:pociskList) 
     pocisk.y=pocisk.y+pocisk.pociskpredkosc*Gdx.graphics.getDeltaTime(); 
    } 

    private void przesuwanie() { 
     if(Gdx.input.isKeyPressed(Input.Keys.A)) 
     { 
      statek.x=statek.x-250*Gdx.graphics.getDeltaTime(); 
     } 
     if(Gdx.input.isKeyPressed(Keys.D)) 
     { 
      statek.x=statek.x+250*Gdx.graphics.getDeltaTime(); 
     } 
     if(Gdx.input.isKeyPressed(Input.Keys.SPACE)) 
     { 
      Pocisk pocisk=new Pocisk(Pocisktekstura); //Called in game render method so create number of Object 
      pocisk.strzal(); 
      pociskList.add(pocisk); 

     } 
    } 

    @Override 
    public void dispose() { 
     //batch.dispose(); 
    } 
} 

我會提醒你，你正在創建遊戲render方法Pocisk對象，所以當你按下Keys.SPACE所以數來創建對象的它多次執行。在InputProcessor接口的keyDown方法中創建對象更好。