Android Open Source - Station42 Faction Sentry System

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License

The source code is released under:

Apache License Version 2.0, January 2004 http://www.apache.org/licenses/ TERMS AND CONDITIONS FOR USE, REPRODUC...

Java Source Code

package com.station42.sentries;
/*w w  w .j a va 2 s. c  o  m*/
import com.badlogic.gdx.math.Vector2;
import com.station42.base.Engine;
import com.station42.base.EngineUpdateListener;
import com.station42.base.Entity;
import com.station42.basic.EntityFacing;
import com.station42.basic.EntityLocation;
import com.station42.bullet.BulletSpawner;
import com.station42.faction.EntityFaction;
import com.station42.game.ScoringPortal;
import com.station42.optimizations.RoomResident;
import com.station42.world.World;

public class FactionSentrySystem implements EngineUpdateListener {

  @Override
  public void update(Engine engine, float delta) {
    for (Entity sentryEntity : engine.getEntitiesWithComponent(Sentry.class)) {
      Sentry sentry = sentryEntity.getComponent(Sentry.class);
      sentry.lastFire += delta;
      if (sentry.lastFire >= sentry.fireSpeed) {
        Vector2 target = getNearestEnemy(engine, sentryEntity);
        if (target != null) {
          Entity bullet = BulletSpawner.spawnBullet(sentryEntity, target, 256, 1);
          engine.spawnEntity(bullet);
          sentry.lastFire = 0;
          EntityFacing facing = sentryEntity.getComponent(EntityFacing.class);
          if (facing != null) {
            EntityLocation sentryLocation = sentryEntity.getComponent(EntityLocation.class);
            facing.setRotation((float) (Math.atan2(-target.y + sentryLocation.getCenterY(), 
                -target.x + sentryLocation.getCenterX()) / Math.PI * 180));
          }
        }
      }
    }
  }

//  private Entity getNearestEnemy(Engine engine, Entity sentryEntity) {
  private Vector2 getNearestEnemy(Engine engine, Entity sentryEntity) {
    Sentry sentry = sentryEntity.getComponent(Sentry.class);
    EntityFaction sentryFaction = sentryEntity.getComponent(EntityFaction.class);
    EntityLocation sentryLocation = sentryEntity.getComponent(EntityLocation.class);
    if (sentryLocation == null)
      return null;
//    Entity nearestTarget = null;
    Vector2 nearestTarget = null;
    float distanceToNearest = sentry.trackingDistance;
    Iterable<Entity> possibleTargets;
    if (sentryEntity.getComponent(RoomResident.class) != null)
      possibleTargets = sentryEntity.getComponent(RoomResident.class).getNeighboringResidentsWithComponent(EntityFaction.class);
    else
      possibleTargets = engine.getEntitiesWithComponent(EntityFaction.class);
    for (Entity possibleTarget : possibleTargets) {
      if (sentryEntity == possibleTarget || possibleTarget.getComponent(Sentry.class) != null || possibleTarget.getComponent(ScoringPortal.class) != null)
        continue;
      EntityFaction targetFaction = possibleTarget.getComponent(EntityFaction.class);
      if (targetFaction != sentryFaction && World.visible(sentryEntity, possibleTarget)) {
        EntityLocation targetLocation = possibleTarget.getComponent(EntityLocation.class);
        if (targetLocation != null) {
          float distance = targetLocation.getDistance(sentryLocation);
          if (distance < distanceToNearest) {
//            nearestTarget = possibleTarget;
            nearestTarget = targetLocation.getCenter();
            distanceToNearest = distance;
          }
        }
      }
    }
    return nearestTarget;
  }
  
}

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