Android Open Source - Avoidance Spatial Render System

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License

The source code is released under:

GNU General Public License

Java Source Code

/* 
 * Copyright (c) 2012 Markus Ekstr?m/*from w  w  w. ja  v a  2  s. co  m*/
 * 
 * This file is based on an example acquired from http://gamadu.com/artemis/demos.html (Spaceship Warrior), which
 * can be found under the following link:
 * http://code.google.com/p/spaceship-warrior/source/browse/src/com/gamadu/spaceshipwarrior/systems/SpriteRenderSystem.java
 * 
 * This file is part of Avoidance.
 * 
 * Avoidance is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Avoidance is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Avoidance.  If not, see <http://www.gnu.org/licenses/>. 
 *  
 */

package se.chalmers.avoidance.core.systems;

import java.util.ArrayList;
import java.util.List;
import java.util.Map;

import org.andengine.entity.scene.Scene;
import org.andengine.entity.sprite.Sprite;
import org.andengine.opengl.texture.region.TextureRegion;
import org.andengine.opengl.vbo.VertexBufferObjectManager;

import se.chalmers.avoidance.constants.FileConstants;
import se.chalmers.avoidance.constants.GameConstants;
import se.chalmers.avoidance.core.components.Immortal;
import se.chalmers.avoidance.core.components.Jump;
import se.chalmers.avoidance.core.components.Spatial;
import se.chalmers.avoidance.core.components.Transform;

import com.artemis.Aspect;
import com.artemis.ComponentMapper;
import com.artemis.Entity;
import com.artemis.EntitySystem;
import com.artemis.annotations.Mapper;
import com.artemis.managers.TagManager;
import com.artemis.utils.ImmutableBag;

/**
 * A system controlling the rendering of sprites.
 * 
 * @author Markus Ekstr?m
 */
public class SpatialRenderSystem extends EntitySystem {
  @Mapper
  private ComponentMapper<Transform> tm;
  @Mapper
  private ComponentMapper<Spatial> sm;

  private TagManager tagManager;
  private List<Entity> entities;
  private Map<String, TextureRegion> regions;
  private VertexBufferObjectManager vbom;
  private Scene scene;
  private boolean playerImmortal = false;

  /**
   * Constructs a <code>SpatialRenderSystem</code>. Uses an aspect containing
   * <code>Transform</code> and <code>Spatial</code> to match against
   * entities.
   * 
   * @param regions
   *            A map containing <code>TextureRegion</code>s.
   * @param vbom
   *            A <code>VertexBufferObjectManager</code>.
   */
  @SuppressWarnings("unchecked")
  public SpatialRenderSystem(Map<String, TextureRegion> regions,
      VertexBufferObjectManager vbom, Scene scene) {
    super(Aspect.getAspectForAll(Transform.class, Spatial.class));
    this.regions = regions;
    this.vbom = vbom;
    this.scene = scene;
    entities = new ArrayList<Entity>();
  }

  @Override
  protected void initialize() {
    tagManager = world.getManager(TagManager.class);
  }

  @Override
  protected boolean checkProcessing() {
    return true;
  }

  @Override
  protected void processEntities(ImmutableBag<Entity> arg0) {
    for (int i = 0; entities.size() > i; i++) {
      process(entities.get(i));
    }
  }

  /**
   * Process an entity.
   * 
   * @param e
   *            The entity to be processed.
   */
  protected void process(Entity e) {
    Spatial spatial = sm.get(e);
    Transform tf = tm.get(e);
    spatial.getSprite().setPosition(tf.getX(), tf.getY());
    spatial.getSprite().setRotation(
        (float) (Math.toDegrees(tf.getDirection())));

    if (e.getId() == world.getManager(TagManager.class)
        .getEntity(GameConstants.TAG_PLAYER).getId()) {
      handleJumpScaling(e);
      handleImmortalSprite(e);
    }
  }

  /**
   * Handles scaling of the sprite when entity has jumped.
   * 
   * @param e
   *            The jumping entity.
   */
  private void handleJumpScaling(Entity e) {
    if (e.getComponent(Jump.class).isInTheAir()) {
      e.getComponent(Spatial.class).getSprite().setScale(2);
    } else {
      e.getComponent(Spatial.class).getSprite().setScale(1);
    }
  }

  /**
   * Handles the changing of sprites for when the player becomes immortal.
   * 
   * @param player
   *            The player entity.
   */
  private void handleImmortalSprite(Entity player) {
    if (player.getComponent(Immortal.class).isImmortal() && !playerImmortal) {
      Transform tf = tm.get(player);
      sm.get(player).getSprite().detachSelf();
      sm.get(player).setSprite(
          new Sprite(tf.getX(), tf.getY(), regions
              .get(FileConstants.IMG_PLAYER_IMMORTAL), vbom));
      sm.get(player).getSprite().setZIndex(50);
      scene.attachChild(sm.get(player).getSprite());
      playerImmortal = true;
    } else if (!player.getComponent(Immortal.class).isImmortal()
        && playerImmortal) {
      Transform tf = tm.get(player);
      Spatial spatial = sm.get(player);
      spatial.getSprite().detachSelf();
      sm.get(player).setSprite(
          new Sprite(tf.getX(), tf.getY(), regions.get(spatial
              .getName()), vbom));
      sm.get(player).getSprite().setZIndex(50);
      scene.attachChild(spatial.getSprite());
      playerImmortal = false;
    }
  }

  @Override
  protected void inserted(Entity e) {
    Spatial spatial = sm.get(e);
    Transform tf = tm.get(e);
    spatial.setSprite(new Sprite(tf.getX(), tf.getY(), regions.get(spatial
        .getName()), vbom));
    scene.attachChild(spatial.getSprite());
    if (tagManager.getEntity(GameConstants.TAG_PLAYER).equals(e)) {
      spatial.getSprite().setZIndex(50);
    }
    scene.sortChildren();
    entities.add(e);
  }

  @Override
  protected void removed(Entity e) {
    e.getComponent(Spatial.class).getSprite().detachSelf();
    entities.remove(e);
  }
}

Java Source Code List

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