libGDX更新和渲染任務隔離

Question

我正在嘗試學習libGDX遊戲開發的一些簡單原則，並且在下面的代碼中弄糟了。我已經分離了更新和渲染的任務，但不太清楚如何將它們結合在一起。我所要做的就是繪製一個簡單的矩形，移動到屏幕上。我的代碼如下。一切工作正常，除了渲染。使用

package com.mygdx.gameobjects; 

import com.badlogic.gdx.math.Rectangle; 

public class Egg { 

private Rectangle egg; 

public Egg(){ 
    egg = new Rectangle(0, 0, 20, 20); 
} 

public void update(float delta) { 
    egg.x++; 
    if (egg.x > 137) { 
     egg.x = 0; 
    } 
} 

public Rectangle getEgg() { 
    return egg; 
} 

} 

更新方法：使用

package com.mygdx.gameworld; 

import com.badlogic.gdx.Gdx; 
import com.mygdx.gameobjects.Egg; 

public class GameWorld { 

private Egg egg; 

public GameWorld() { 

    egg = new Egg(); 
} 

public void update(float delta) { 

    Gdx.app.log("GameWorld", "update"); 
    egg.update(delta); 
} 

public Egg getEgg() { 
    return egg; 

} 
} 

渲染方法：

package com.mygdx.gameworld; 

import com.badlogic.gdx.Gdx; 
import com.badlogic.gdx.graphics.GL20; 
import com.badlogic.gdx.graphics.OrthographicCamera; 
import com.badlogic.gdx.graphics.glutils.ShapeRenderer; 
import com.mygdx.gameobjects.Egg; 

public class GameRenderer { 

private GameWorld myWorld; 
private OrthographicCamera cam; 
private ShapeRenderer shapeRenderer; 
private Egg rect; 


public GameRenderer(GameWorld world) { 
    myWorld = world; 
    cam = new OrthographicCamera(); 
    cam.setToOrtho(true, 136, 204); 
    shapeRenderer = new ShapeRenderer(); 
    shapeRenderer.setProjectionMatrix(cam.combined); 

} 

public void render() { 
    Gdx.app.log("GameRenderer", "render"); 
    Gdx.gl.glClearColor(0, 1, 1, 1); 
    Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT); 

    shapeRenderer.begin(ShapeRenderer.ShapeType.Line); 

    shapeRenderer.setColor(255/255.0f, 109/255.0f, 120/255.0f, 1); 

    shapeRenderer.rect(myWorld.getEgg().x, myWorld.getEgg().y, 
      myWorld.getEgg().width, myWorld.getEgg().height); 

    shapeRenderer.end(); 


} 
} 

Answer 1

您需要將相機適用於形狀渲染器。

把shapeRenderer.setProjectionMatrix(cam.combined);就在shapeRenderer.begin之前。