libgdx学习记录5——演员Actor

Actor也是libgdx中非常重要的一个元素，一般与stage配合一起使用。Actor能够设置大小，位置，旋转和动画等。

我们自定义的Actor一般需要继承于Actor，并且重写其中的act和draw方法。

自定义的actor是一个图片。

 class MyActor extends Actor{
     TextureRegion region;

     public MyActor(){
         Texture texture = new Texture( Gdx.files.internal( "data/badlogic.jpg" ) );
         region = new TextureRegion( texture );
         setSize( region.getRegionWidth()/2, region.getRegionHeight()/2 );
         setOrigin( getWidth()/2, getHeight()/2 );
     }

     @Override
     public void act(float delta) {
         // TODO Auto-generated method stub
         super.act(delta);
     }

     @Override
     public void draw(SpriteBatch batch, float parentAlpha) {
         // TODO Auto-generated method stub
         batch.draw( region, getX(), getY(), getOriginX(), getOriginY(), getWidth(), getHeight(), getScaleX(), getScaleY(), getRotation() );
         super.draw(batch, parentAlpha);
     }

     public void dispose(){
         region.getTexture().dispose();
     }
 }

主类，包含stage：

 package com.fxb.newtest;
 import com.badlogic.gdx.ApplicationAdapter;
 import com.badlogic.gdx.Gdx;
 import com.badlogic.gdx.graphics.Color;
 import com.badlogic.gdx.graphics.GL10;
 import com.badlogic.gdx.graphics.Texture;
 import com.badlogic.gdx.graphics.g2d.BitmapFont;
 import com.badlogic.gdx.graphics.g2d.SpriteBatch;
 import com.badlogic.gdx.graphics.g2d.TextureRegion;
 import com.badlogic.gdx.scenes.scene2d.Actor;
 import com.badlogic.gdx.scenes.scene2d.InputEvent;
 import com.badlogic.gdx.scenes.scene2d.InputListener;
 import com.badlogic.gdx.scenes.scene2d.Stage;
 import com.badlogic.gdx.scenes.scene2d.ui.Image;

 public class Lib004_Actor extends ApplicationAdapter{

     BitmapFont font;
     Stage stage;
     MyActor actor;
     //String strShow;
     int count;

     @Override
     public void create() {
         // TODO Auto-generated method stub
         stage = new Stage();
         font = new BitmapFont();
         font.setColor( Color.DARK_GRAY );

         actor = new MyActor();
         stage.addActor( actor );
         actor.setPosition( stage.getWidth()/2-actor.getWidth()/2, stage.getHeight()/2-actor.getHeight()/2 );

         count = 0;
         actor.addListener(new InputListener(){
             @Override
             public boolean touchDown(InputEvent event, float x, float y, int pointer, int button) {
                 // TODO Auto-generated method stub
                 count++;
                 return true;
             }
         });

         Gdx.input.setInputProcessor( stage );
     }

     @Override
     public void render() {
         // TODO Auto-generated method stub
         Gdx.gl.glClearColor( 1, 1, 1, 1 );
         Gdx.gl.glClear( GL10.GL_COLOR_BUFFER_BIT );

         stage.act();
         stage.draw();

         SpriteBatch batch = stage.getSpriteBatch();
         batch.begin();
         //batch.draw( font, actor.getX(),  );
         font.draw( batch, "You have clicked  " + count + "  times!", actor.getX()-25, actor.getY()-20 );
         batch.end();

     }

     @Override
     public void dispose() {
         // TODO Auto-generated method stub
         super.dispose();
     }

 }

运行结果：