libgdx学习记录23——图片移动选择

模拟移动选择图片，采用相机实现。

 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.glutils.ShapeRenderer;
 import com.badlogic.gdx.graphics.glutils.ShapeRenderer.ShapeType;
 import com.badlogic.gdx.input.GestureDetector;
 import com.badlogic.gdx.input.GestureDetector.GestureAdapter;
 import com.badlogic.gdx.scenes.scene2d.Action;
 import com.badlogic.gdx.scenes.scene2d.Stage;
 import com.badlogic.gdx.scenes.scene2d.actions.Actions;
 import com.badlogic.gdx.scenes.scene2d.ui.Image;

 public class Lib025_PicChange extends ApplicationAdapter{

     GestureAdapter gestureAdapter = new GestureAdapter(){
         @Override
         public boolean fling(float velocityX, float velocityY, int button) {
             // TODO Auto-generated method stub
 /*            if( velocityX > 0 ){
                 System.out.println( "fling right" );
                 stage.getCamera().translate( -stage.getWidth(), 0, 0 );
             }
             else{
                 System.out.println( "fling left" );
                 stage.getCamera().translate( stage.getWidth(), 0, 0 );
             }*/

             return super.fling(velocityX, velocityY, button);
         }

         @Override
         public boolean pan(float x, float y, float deltaX, float deltaY) {
             // TODO Auto-generated method stub
             System.out.println( "pan" );
             if( index>0 && deltaX>0 || index<imgs.length-1 && deltaX<0 ){
                 stage.getCamera().translate( -deltaX, 0, 0 );
                 add = deltaX > 0? -1: 1;
             }            

             return super.pan(x, y, deltaX, deltaY);
         }

         @Override
         public boolean panStop(float x, float y, int pointer, int button) {
             // TODO Auto-generated method stub
             System.out.println( "pan stop" );
             if( index>0 && add==-1 || index<imgs.length-1 && add==1 ){
                 index += add;
                 stage.getCamera().position.set( index*500+stage.getWidth()/2, stage.getHeight()/2, 0 );
             }
             return super.panStop(x, y, pointer, button);
         }    

     };
     GestureDetector detector = new GestureDetector( gestureAdapter );

     Stage stage;
     Image img1, img2, img3, img4;
     Image[] imgs;
     int index;
     int add = 0;
     ShapeRenderer rend;

     @Override
     public void create() {
         // TODO Auto-generated method stub
         super.create();
         Gdx.input.setInputProcessor( detector );

         img1 = new Image( new Texture( Gdx.files.internal( "data/pal4_0.jpg" ) ) );
         img2 = new Image( new Texture( Gdx.files.internal( "data/pal4_1.jpg" ) ) );
         img3 = new Image( new Texture( Gdx.files.internal( "data/pal4_2.jpg" ) ) );
         img4 = new Image( new Texture( Gdx.files.internal( "data/pal4_3.jpg" ) ) );

         stage = new Stage();
         stage.addActor( img1 );
         stage.addActor( img2 );
         stage.addActor( img3 );
         stage.addActor( img4 );

         imgs = new Image[]{ img1, img2, img3, img4 };

         for( int i=0; i<imgs.length; ++i ){
             imgs[i].setSize( 400, 240 );
             imgs[i].setPosition( i*500 + stage.getWidth()/2-imgs[i].getWidth()/2, stage.getHeight()/2-imgs[i].getHeight()/2 );
         }

         //imgs[1].setVisible( false );
         //imgs[2].setVisible( false );
         index = 0;
         rend = new ShapeRenderer();
     }

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

         rend.begin( ShapeType.Filled );
         rend.setColor( Color.LIGHT_GRAY );
         rend.rect( 0, 0, 100, 480 );
         rend.rect( 700, 0, 100, 480 );
         rend.rect( 100, 0, 700, 60 );
         rend.rect( 100, 420, 700, 60 );
         rend.end();

     }

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

 }

运行结果：