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20. January 2015

 

In this third part of multiple part video tutorial looking at using Scene2D we look at creating Groups for organizing Actors, as well as hit testing, making it possible to select actors available in your scene.  All of the code is included below.  For an HD version of the video click here.

 

 

Groups

package com.gamefromscratch.group;

import com.badlogic.gdx.ApplicationAdapter;
import com.badlogic.gdx.Gdx;
import com.badlogic.gdx.Input;
import com.badlogic.gdx.InputProcessor;
import com.badlogic.gdx.graphics.GL20;
import com.badlogic.gdx.graphics.Texture;
import com.badlogic.gdx.graphics.g2d.SpriteBatch;
import com.badlogic.gdx.math.Vector;
import com.badlogic.gdx.math.Vector2;
import com.badlogic.gdx.scenes.scene2d.Actor;
import com.badlogic.gdx.scenes.scene2d.Group;
import com.badlogic.gdx.scenes.scene2d.Stage;
import com.badlogic.gdx.scenes.scene2d.ui.Image;
import com.badlogic.gdx.utils.viewport.ScreenViewport;

public class GroupDemo extends ApplicationAdapter implements InputProcessor {
   Stage stage;

   @Override
   public void create () {
      stage = new Stage(new ScreenViewport());
      Group group =  new Group();

      Image tableImg = new Image(new Texture(Gdx.files.internal("table.png")));
      Image aceImg = new Image(new Texture(Gdx.files.internal("ace.png")));
      Image kingImg = new Image(new Texture(Gdx.files.internal("king.png")));

      tableImg.setName("table");
      aceImg.setName("ace");
      kingImg.setName("king");

      group.addActor(tableImg);
      group.addActor(kingImg);
      group.addActor(aceImg);

      stage.addActor(group);

      kingImg.setPosition(300,150);
      aceImg.setPosition(400,150);

      Gdx.input.setInputProcessor(this);
   }

   @Override
   public void render () {
      Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT);
      stage.act(Gdx.graphics.getDeltaTime());
      stage.draw();
   }

   @Override
   public boolean keyDown(int keycode) {
      Group group = (Group)stage.getActors().first();
      Image ace = (Image)group.findActor("ace");

      if(keycode == Input.Keys.RIGHT)
         if(Gdx.input.isKeyPressed(Input.Keys.CONTROL_LEFT))
            ace.setRotation(ace.getRotation() + 1f);
         else
            group.setRotation(group.getRotation() + 1f);

      if(keycode == Input.Keys.LEFT)
         if(Gdx.input.isKeyPressed(Input.Keys.CONTROL_LEFT))
            ace.setRotation(ace.getRotation() -1f);
         else
            group.setRotation(group.getRotation() - 1f);

      if(keycode == Input.Keys.UP)
         group.setColor(group.getColor().r,group.getColor().g,
               group.getColor().b,group.getColor().a + 0.1f );

      if(keycode == Input.Keys.DOWN)
         group.setColor(group.getColor().r,group.getColor().g,
               group.getColor().b,group.getColor().a - 0.1f );

      if(keycode == Input.Keys.NUM_1)
         ace.setZIndex(ace.getZIndex() -1);
      if(keycode == Input.Keys.NUM_2)
         ace.setZIndex(ace.getZIndex() +1);

      return true;
   }

   @Override
   public boolean keyUp(int keycode) {
      return false;
   }

   @Override
   public boolean keyTyped(char character) {
      return false;
   }

   @Override
   public boolean touchDown(int screenX, int screenY, int pointer, int button) {
      Vector2 coord = stage.screenToStageCoordinates(new Vector2((float)screenX,(float)screenY));
      Actor hitActor = stage.hit(coord.x,coord.y,false);

      if(hitActor != null)
         Gdx.app.log("HIT",hitActor.getName());

      return true;
   }

   @Override
   public boolean touchUp(int screenX, int screenY, int pointer, int button) {
      return false;
   }

   @Override
   public boolean touchDragged(int screenX, int screenY, int pointer) {
      return false;
   }

   @Override
   public boolean mouseMoved(int screenX, int screenY) {
      return false;
   }

   @Override
   public boolean scrolled(int amount) {
      return false;
   }
}

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