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。

 1 class MyActor extends Actor{

 2     TextureRegion region;

 3

 4     public MyActor(){

 5         Texture texture = new Texture( Gdx.files.internal( "data/badlogic.jpg" ) );

 6         region = new TextureRegion( texture );

 7         setSize( region.getRegionWidth()/2, region.getRegionHeight()/2 );

 8         setOrigin( getWidth()/2, getHeight()/2 );

 9     }

10

11     @Override

12     public void act(float delta) {

13         // TODO Auto-generated method stub

14         super.act(delta);

15     }

16

17     @Override

18     public void draw(SpriteBatch batch, float parentAlpha) {

19         // TODO Auto-generated method stub

20         batch.draw( region, getX(), getY(), getOriginX(), getOriginY(), getWidth(), getHeight(), getScaleX(), getScaleY(), getRotation() );

21         super.draw(batch, parentAlpha);

22     }

23

24     public void dispose(){

25         region.getTexture().dispose();

26     }

27 }

主类，包含stage：

 1 package com.fxb.newtest;

 2 import com.badlogic.gdx.ApplicationAdapter;

 3 import com.badlogic.gdx.Gdx;

 4 import com.badlogic.gdx.graphics.Color;

 5 import com.badlogic.gdx.graphics.GL10;

 6 import com.badlogic.gdx.graphics.Texture;

 7 import com.badlogic.gdx.graphics.g2d.BitmapFont;

 8 import com.badlogic.gdx.graphics.g2d.SpriteBatch;

 9 import com.badlogic.gdx.graphics.g2d.TextureRegion;

10 import com.badlogic.gdx.scenes.scene2d.Actor;

11 import com.badlogic.gdx.scenes.scene2d.InputEvent;

12 import com.badlogic.gdx.scenes.scene2d.InputListener;

13 import com.badlogic.gdx.scenes.scene2d.Stage;

14 import com.badlogic.gdx.scenes.scene2d.ui.Image;

15

16 public class Lib004_Actor extends ApplicationAdapter{

17

18     BitmapFont font;

19     Stage stage;

20     MyActor actor;

21     //String strShow;

22     int count;

23

24     @Override

25     public void create() {

26         // TODO Auto-generated method stub

27         stage = new Stage();

28         font = new BitmapFont();

29         font.setColor( Color.DARK_GRAY );

30

31         actor = new MyActor();

32         stage.addActor( actor );

33         actor.setPosition( stage.getWidth()/2-actor.getWidth()/2, stage.getHeight()/2-actor.getHeight()/2 );

34

35         count = 0;

36         actor.addListener(new InputListener(){

37             @Override

38             public boolean touchDown(InputEvent event, float x, float y, int pointer, int button) {

39                 // TODO Auto-generated method stub

40                 count++;

41                 return true;

42             }

43         });

44

45         Gdx.input.setInputProcessor( stage );

46     }

47

48     @Override

49     public void render() {

50         // TODO Auto-generated method stub

51         Gdx.gl.glClearColor( 1, 1, 1, 1 );

52         Gdx.gl.glClear( GL10.GL_COLOR_BUFFER_BIT );

53

54         stage.act();

55         stage.draw();

56

57         SpriteBatch batch = stage.getSpriteBatch();

58         batch.begin();

59         //batch.draw( font, actor.getX(),  );

60         font.draw( batch, "You have clicked  " + count + "  times!", actor.getX()-25, actor.getY()-20 );

61         batch.end();

62

63     }

64

65     @Override

66     public void dispose() {

67         // TODO Auto-generated method stub

68         super.dispose();

69     }

70

71 }

运行结果：