libgdx学习记录10——Particle粒子

粒子对制作画面特效很有用，可以使用Particle Editor进行自行编辑粒子效果，跟图片一起生成.p粒子文件，然后导入到程序中使用。

本文所用的粒子效果是基于其自带的demo的。

实例：

 package com.fxb.newtest;

 import com.badlogic.gdx.ApplicationAdapter;
 import com.badlogic.gdx.Gdx;
 import com.badlogic.gdx.Input;
 import com.badlogic.gdx.InputAdapter;
 import com.badlogic.gdx.InputProcessor;
 import com.badlogic.gdx.graphics.GL10;
 import com.badlogic.gdx.graphics.g2d.ParticleEffect;
 import com.badlogic.gdx.graphics.g2d.ParticleEmitter;
 import com.badlogic.gdx.graphics.g2d.SpriteBatch;
 import com.badlogic.gdx.utils.Array;

 public class Lib008_Particle extends ApplicationAdapter{

     ParticleEffect effect;
     InputProcessor processor;

     float positionX;
     float positionY;

     SpriteBatch batch;

     Array<ParticleEmitter> sEmitter;
     int index = ;
     int maxSize;

     @Override
     public void create() {
         // TODO Auto-generated method stub
         batch = new SpriteBatch();
         effect = new ParticleEffect();
         effect.load( Gdx.files.internal("particle/test.p"), Gdx.files.internal("particle/") );
         maxSize = effect.getEmitters().size;

         positionX = Gdx.graphics.getWidth()/;
         positionY = Gdx.graphics.getHeight()/;

         //processor = new InputProcessor(){
         processor = new InputAdapter(){
             @Override
             public boolean keyDown(int keycode) {
                 // TODO Auto-generated method stub
                 if( keycode == Input.Keys.SPACE ){
                     index = (++index)%maxSize;
                     effect.getEmitters().clear();
                     effect.getEmitters().add( sEmitter.get(index) );
                 }
                 return false;
             }
             @Override
             public boolean touchDragged(int screenX, int screenY, int pointer) {
                 // TODO Auto-generated method stub
                 positionX = screenX;
                 positionY = Gdx.graphics.getHeight()-screenY;
                 return false;
             }
         };

         Gdx.input.setInputProcessor( processor );

         sEmitter = new Array<ParticleEmitter>();
         for( ParticleEmitter emitter : effect.getEmitters() ){
             sEmitter.add( emitter );
         }
         effect.getEmitters().clear();
         effect.getEmitters().add( sEmitter.get(index) );
     }

     @Override
     public void render() {
         // TODO Auto-generated method stub
         Gdx.gl.glClear( GL10.GL_COLOR_BUFFER_BIT );
         effect.setPosition( positionX, positionY );

         float delta = Gdx.graphics.getDeltaTime();
         batch.begin();
         effect.draw( batch, delta );
         batch.end();

     }

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

 }

运行效果：

这个粒子一共有4层，每按一次空格键就会切换一层，然后显示对应的粒子效果。