libgdx学习记录24——九宫格NinePatch

NinePatch用于图片纹理拉伸显示。当图片拉伸时，4个角不会拉伸，而只有中间的部分会拉伸，适合做圆角矩形类的Button。

简单示例：

 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.graphics.GL10;
 import com.badlogic.gdx.graphics.Texture;
 import com.badlogic.gdx.graphics.g2d.NinePatch;
 import com.badlogic.gdx.graphics.g2d.SpriteBatch;
 import com.badlogic.gdx.graphics.g2d.TextureRegion;

 public class Lib029_NinePatch extends ApplicationAdapter{

     NinePatch patch;
     SpriteBatch batch;
     TextureRegion region;

     int width;
     int height;

     @Override
     public void create() {
         // TODO Auto-generated method stub
         super.create();
         //TextureRegion region = new TextureRegion( new Texture( Gdx.files.internal( "data/badlogic.jpg" ) ) );
         region = new TextureRegion( new Texture( Gdx.files.internal( "data/button_green.png" ) ) );
         patch = new NinePatch( region, 13, 13, 13, 13 );
         batch = new SpriteBatch();

         width = 100;
         height = 30;
     }

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

         if( Gdx.input.isKeyPressed( Input.Keys.LEFT ) ){
             width-=2;
         }
         else if( Gdx.input.isKeyPressed( Input.Keys.RIGHT ) ){
             width+=2;
         }
         else if( Gdx.input.isKeyPressed( Input.Keys.DOWN ) ){
             height-=2;
         }
         else if( Gdx.input.isKeyPressed( Input.Keys.UP ) ){
             height+=2;
         }

         Gdx.gl.glClearColor( 1, 1, 1, 1 );
         Gdx.gl.glClear( GL10.GL_COLOR_BUFFER_BIT );

         batch.begin();
         patch.draw( batch, 10, 10, width, height );
         batch.draw( region, 10, 20+height, width, height );
         batch.end();
     }

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

 }

结果：

上面的是原生态的图片，下面使用了NinePatch，拉伸的时候4个角没有变化，没有出现变形，适合做Button等控件。