Added AI system + a basic AI.

core/src/com/saltosion/gladiator/GladiatorBrawler.java

@@ -8,6 +8,7 @@ import com.badlogic.gdx.Gdx;
 import com.badlogic.gdx.Input;
 import com.badlogic.gdx.graphics.g2d.Sprite;
 import com.badlogic.gdx.math.Vector2;
+import com.saltosion.gladiator.components.CAI;
 import com.saltosion.gladiator.components.CCombat;
 import com.saltosion.gladiator.components.CPhysics;
 import com.saltosion.gladiator.components.CRenderedObject;
@@ -15,6 +16,8 @@ import com.saltosion.gladiator.gui.ButtonNode;
 import com.saltosion.gladiator.gui.GUIManager;
 import com.saltosion.gladiator.input.InputHandler;
 import com.saltosion.gladiator.listeners.CombatListener;
+import com.saltosion.gladiator.listeners.ai.DummyAI;
+import com.saltosion.gladiator.systems.AISystem;
 import com.saltosion.gladiator.systems.CombatSystem;
 import com.saltosion.gladiator.systems.MiscManagerSystem;
 import com.saltosion.gladiator.systems.PhysicsSystem;
@@ -45,6 +48,7 @@ public class GladiatorBrawler extends ApplicationAdapter {
 		engine.addSystem(new RenderingSystem());
 		engine.addSystem(new CombatSystem());
 		engine.addSystem(new MiscManagerSystem());
+		engine.addSystem(new AISystem());
 		engine.addEntityListener(new EntityListener() {
 			@Override
 			public void entityAdded(Entity entity) {
@@ -56,6 +60,8 @@ public class GladiatorBrawler extends ApplicationAdapter {
 				cs.updateEntities(engine);
 				MiscManagerSystem mms = engine.getSystem(MiscManagerSystem.class);
 				mms.updateEntities(engine);
+				AISystem ais = engine.getSystem(AISystem.class);
+				ais.updateEntities(engine);
 			}
 
 			@Override
@@ -68,6 +74,8 @@ public class GladiatorBrawler extends ApplicationAdapter {
 				cs.updateEntities(engine);
 				MiscManagerSystem mms = engine.getSystem(MiscManagerSystem.class);
 				mms.updateEntities(engine);
+				AISystem ais = engine.getSystem(AISystem.class);
+				ais.updateEntities(engine);
 			}
 		});
 
@@ -130,7 +138,8 @@ public class GladiatorBrawler extends ApplicationAdapter {
 						System.out.println(String.format("I took %d damage! Damnit!", damageTaken));
 					}
 
-		}));
+				}));
+		dummy.add(new CAI().setReactDistance(5).setAIListener(new DummyAI()));
 		engine.addEntity(dummy);
 		dummy.getComponent(CCombat.class).inputs.put(Direction.UP, true);
 	}

core/src/com/saltosion/gladiator/components/CAI.java

@@ -0,0 +1,33 @@
+package com.saltosion.gladiator.components;
+
+import com.badlogic.ashley.core.Component;
+import com.saltosion.gladiator.listeners.AIListener;
+
+/**
+ *
+ * @author Jens "Jeasonfire" Pitkänen <jeasonfire@gmail.com>
+ */
+public class CAI extends Component {
+
+	private AIListener listener;
+	private float reactDistance = 1;
+
+	public CAI setReactDistance(float reactDistance) {
+		this.reactDistance = reactDistance;
+		return this;
+	}
+
+	public float getReactDistance() {
+		return reactDistance;
+	}
+
+	public CAI setAIListener(AIListener listener) {
+		this.listener = listener;
+		return this;
+	}
+
+	public AIListener getAIListener() {
+		return listener;
+	}
+
+}

core/src/com/saltosion/gladiator/components/CPhysics.java

@@ -80,6 +80,16 @@ public class CPhysics extends Component {
 		return this;
 	}
 
+	public CPhysics setVelocity(float x, float y) {
+		this.velocity.set(x, y);
+		return this;
+	}
+
+	public CPhysics setVelocity(Vector2 pos) {
+		this.velocity.set(pos);
+		return this;
+	}
+
 	public CPhysics setMoveSpeed(float movespeed) {
 		this.movespeed = movespeed;
 		return this;

core/src/com/saltosion/gladiator/listeners/AIListener.java

@@ -0,0 +1,19 @@
+package com.saltosion.gladiator.listeners;
+
+import com.badlogic.ashley.core.Entity;
+import java.util.ArrayList;
+
+/**
+ *
+ * @author Jens "Jeasonfire" Pitkänen <jeasonfire@gmail.com>
+ */
+public interface AIListener {
+
+	/**
+	 * @param closeEntities A list of entities that are close to the host entity
+	 * than the host entity's reactDistance.
+	 * @param host The host entity of this listener
+	 */
+	public void react(ArrayList<Entity> closeEntities, Entity host);
+
+}

core/src/com/saltosion/gladiator/listeners/ai/DummyAI.java

@@ -0,0 +1,43 @@
+package com.saltosion.gladiator.listeners.ai;
+
+import com.badlogic.ashley.core.ComponentMapper;
+import com.badlogic.ashley.core.Entity;
+import com.saltosion.gladiator.components.CCombat;
+import com.saltosion.gladiator.components.CPhysics;
+import com.saltosion.gladiator.listeners.AIListener;
+import com.saltosion.gladiator.util.Direction;
+import java.util.ArrayList;
+
+/**
+ *
+ * @author Jens "Jeasonfire" Pitkänen <jeasonfire@gmail.com>
+ */
+public class DummyAI implements AIListener {
+
+	private static final ComponentMapper<CPhysics> pm = ComponentMapper.getFor(CPhysics.class);
+	private static final ComponentMapper<CCombat> cm = ComponentMapper.getFor(CCombat.class);
+
+	@Override
+	public void react(ArrayList<Entity> closeEntities, Entity host) {
+		CPhysics p0 = pm.get(host);
+		CCombat c0 = cm.get(host);
+		c0.inputs.put(Direction.UP, false);
+		c0.inputs.put(Direction.DOWN, false);
+		c0.inputs.put(Direction.LEFT, false);
+		c0.inputs.put(Direction.RIGHT, false);
+		for (Entity other : closeEntities) {
+			CPhysics p1 = pm.get(other);
+
+			if (p0.getPosition().x + p0.getSize().x / 3 < p1.getPosition().x - p1.getSize().x / 3) {
+				c0.inputs.put(Direction.RIGHT, true);
+			} else if (p0.getPosition().x - p0.getSize().x / 3 > p1.getPosition().x + p1.getSize().x / 3) {
+				c0.inputs.put(Direction.LEFT, true);
+			} else if (p0.getPosition().y + p0.getSize().y / 3 < p1.getPosition().y - p1.getSize().y / 3) {
+				c0.inputs.put(Direction.UP, true);
+			} else if (p0.getPosition().y - p0.getSize().y / 3 > p1.getPosition().y + p1.getSize().y / 3) {
+				c0.inputs.put(Direction.DOWN, true);
+			}
+		}
+	}
+
+}

core/src/com/saltosion/gladiator/systems/AISystem.java

@@ -0,0 +1,63 @@
+package com.saltosion.gladiator.systems;
+
+import com.badlogic.ashley.core.ComponentMapper;
+import com.badlogic.ashley.core.Engine;
+import com.badlogic.ashley.core.Entity;
+import com.badlogic.ashley.core.EntitySystem;
+import com.badlogic.ashley.core.Family;
+import com.badlogic.ashley.utils.ImmutableArray;
+import com.saltosion.gladiator.components.CAI;
+import com.saltosion.gladiator.components.CCombat;
+import com.saltosion.gladiator.components.CPhysics;
+import java.util.ArrayList;
+
+/**
+ *
+ * @author Jens "Jeasonfire" Pitkänen <jeasonfire@gmail.com>
+ */
+public class AISystem extends EntitySystem {
+
+	private static final ComponentMapper<CPhysics> pm = ComponentMapper.getFor(CPhysics.class);
+	private static final ComponentMapper<CAI> aim = ComponentMapper.getFor(CAI.class);
+	private ImmutableArray<Entity> entities;
+
+	@Override
+	public void addedToEngine(Engine engine) {
+		updateEntities(engine);
+	}
+
+	@Override
+	public void update(float deltaTime) {
+		// Loop through all entities that have CCombat
+		for (int i = 0; i < entities.size(); i++) {
+			// If current entity doesn't have CAI, skip current entity
+			if (aim.get(entities.get(i)) == null) {
+				continue;
+			}
+
+			CPhysics cp0 = pm.get(entities.get(i));
+			CAI cai = aim.get(entities.get(i));
+
+			// React
+			ArrayList<Entity> reactEntities = new ArrayList<Entity>();
+			// Loop through all entities with CCombat
+			for (int j = 0; j < entities.size(); j++) {
+				if (i == j) {
+					continue;
+				}
+				CPhysics cp1 = pm.get(entities.get(j));
+				float x = cp1.getPosition().x - cp0.getPosition().x;
+				float y = cp1.getPosition().y - cp0.getPosition().y;
+				float len = (float) Math.sqrt(x * x + y * y);
+				if (len <= cai.getReactDistance()) {
+					reactEntities.add(entities.get(j));
+				}
+			}
+			cai.getAIListener().react(reactEntities, entities.get(i));
+		}
+	}
+
+	public void updateEntities(Engine engine) {
+		entities = engine.getEntitiesFor(Family.getFor(CCombat.class));
+	}
+}

core/src/com/saltosion/gladiator/systems/PhysicsSystem.java

@@ -17,8 +17,9 @@ import com.saltosion.gladiator.util.Direction;
 public class PhysicsSystem extends EntitySystem {
 
 	private static final float MAX_VEL = 0.5f;
-	private ComponentMapper<CPhysics> pm = ComponentMapper.getFor(CPhysics.class);
+
-	private ComponentMapper<CCombat> cm = ComponentMapper.getFor(CCombat.class);
+	private static final ComponentMapper<CPhysics> pm = ComponentMapper.getFor(CPhysics.class);
+	private static final ComponentMapper<CCombat> cm = ComponentMapper.getFor(CCombat.class);
 	private ImmutableArray<Entity> entities;
 
 	@Override