state machine

Assets/Resources/Scripts/AIScripts/Enemy.cs

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+using UnityEngine;
+using System.Collections;
+using GameUtils;
+using System;
+
+public class Enemy : Controller, ISceneObject{
+
+    private state currentState;
+	// Use this for initialization
+	void Start ()
+    {
+        print("start");
+        changestate(new idle());
+	}
+	
+	// Update is called once per frame
+	void Update ()
+    {
+        currentState.Execute();
+	}
+    public void changestate(state newstate)
+    {
+        if (currentState != null)
+            currentState.Exit();
+        currentState = newstate;
+        currentState.Enter(this);   
+    }
+
+    public void ObjectUpdate()
+    {
+    }
+
+    public void Initialize()
+    {
+
+    }
+}

Assets/Resources/Scripts/AIScripts/Enemy.cs.meta

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Assets/Resources/Scripts/AIScripts/ExtensionMethods.cs

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+using UnityEngine;
+using System.Collections;
+
+public static class ExtensionMethods
+{
+    public static Vector2 toVector2(this Vector3 vec3)
+    {
+        return new Vector2(vec3.x, vec3.y);
+    }
+}

Assets/Resources/Scripts/AIScripts/ExtensionMethods.cs.meta

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Assets/Resources/Scripts/AIScripts/FlyingAI.cs

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+using UnityEngine;
+using System.Collections;
+
+public class FlyingAI : MonoBehaviour {
+
+
+
+    public LayerMask enemyMask;
+    public float speed = 1;
+    Rigidbody2D myBody;
+    Transform myTrans;
+    float myWidth;
+
+    // Use this for initialization
+    void Start()
+    {
+        myTrans = this.transform;
+        myBody = this.GetComponent<Rigidbody2D>();
+        myWidth = this.GetComponent<SpriteRenderer>().bounds.extents.x;
+    }
+   
+	
+	// Update is called once per frame
+	void FixedUpdate ()
+    {
+
+        //check to see if there's ground in front of us before moving forward
+        Vector2 lineCastPos = myTrans.position - myTrans.right * myWidth;
+        Debug.DrawLine(lineCastPos, lineCastPos + Vector2.down);
+        bool isGrounded = Physics2D.Linecast(lineCastPos, lineCastPos + Vector2.down, enemyMask);
+        Debug.DrawLine(lineCastPos, lineCastPos + Vector2.down);
+        //bool isBlocked = Physics2D.Linecast(lineCastPos, lineCastPos - myTrans.right.toVector2(), enemyMask);
+
+        //if no ground turn around
+        if(!isGrounded)
+        {
+            Vector3 currentRot = myTrans.eulerAngles;
+            currentRot.y += 180;
+            myTrans.eulerAngles = currentRot;
+        }
+
+
+        //always move forward
+        Vector2 myVel = myBody.velocity;
+        myVel.x = -myTrans.right.x * speed;
+        myBody.velocity = myVel;
+	}
+
+}

Assets/Resources/Scripts/AIScripts/FlyingAI.cs.meta

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Assets/Resources/Scripts/AIScripts/idle.cs

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+using UnityEngine;
+using System.Collections;
+using System;
+
+public class idle : state {
+    private Enemy enemy;
+    private float time = 0;
+    public void Execute()
+    {
+        time += Time.deltaTime;
+        if (time >= 1)
+            enemy.changestate(new wander());
+    }
+
+    public void Enter(Enemy enemy)
+    {
+        Debug.Log("idle");
+        time = 0;
+        this.enemy = enemy;
+    }
+
+    public void Exit()
+    {
+    }
+
+    public void onTriggerEnter(Collider2D other)
+    {
+    }
+}

Assets/Resources/Scripts/AIScripts/idle.cs.meta

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Assets/Resources/Scripts/AIScripts/seeking.cs

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+using UnityEngine;
+using System.Collections;
+using System;
+
+public class seeking : state {
+    private Enemy enemy;
+    public void Enter(Enemy enemy)
+    {
+        this.enemy = enemy;
+    }
+
+    public void Execute()
+    {
+
+    }
+    
+    public void Exit()
+    {
+    }
+    
+    public void onTriggerEnter(Collider2D other)
+    {
+    }
+
+    // Use this for initialization
+    void Start () {
+	
+	}
+	
+	// Update is called once per frame
+	void Update () {
+	
+	}
+}

Assets/Resources/Scripts/AIScripts/seeking.cs.meta

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Assets/Resources/Scripts/AIScripts/state.cs

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+using UnityEngine;
+using System.Collections;
+
+public interface state {
+    void Execute();
+    void Enter(Enemy enemy);
+    void Exit();
+    void onTriggerEnter(Collider2D other);
+}

Assets/Resources/Scripts/AIScripts/state.cs.meta

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Assets/Resources/Scripts/AIScripts/wander.cs

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+using UnityEngine;
+using System.Collections;
+using System;
+
+public class wander : state {
+    private Enemy enemy;
+    public LayerMask enemyMask;
+    public float speed = 5;
+    Rigidbody2D myBody;
+    Transform myTrans;
+    float myWidth, myHeight;
+    private float time=0;
+
+    public void Execute()
+    {   
+        time += Time.deltaTime;
+        if (time >= 5)
+            enemy.changestate(new idle());
+        //check to see if there's ground in front of us before moving forward
+        Vector2 lineCastPos = myTrans.position.toVector2() - myTrans.right.toVector2() * myWidth + Vector2.up * myHeight;
+        lineCastPos.y = lineCastPos.y - (myHeight * 1.2f);
+        Debug.DrawLine(lineCastPos, lineCastPos + Vector2.down);
+        bool isGrounded = Physics2D.Linecast(lineCastPos, lineCastPos + Vector2.down, enemyMask);
+        Debug.DrawLine(lineCastPos, lineCastPos - myTrans.right.toVector2() * 0.05f);
+        bool isBlocked = Physics2D.Linecast(lineCastPos, lineCastPos - myTrans.right.toVector2() * 0.05f, enemyMask);
+        //if no ground turn around
+        if (!isGrounded || isBlocked)
+        {
+            Vector3 currentRot = myTrans.eulerAngles;
+            currentRot.y += 180;
+            myTrans.eulerAngles = currentRot;
+        }
+        //always move forward
+        Vector2 myVel = myBody.velocity;
+        myVel.x = -myTrans.right.x * speed;
+        myBody.velocity = myVel;
+    }
+
+    public void Enter(Enemy enemy)
+    {
+        Debug.Log("Wander");
+        time = 0;
+        this.enemy = enemy;
+        myTrans = enemy.transform;
+        myBody = enemy.GetComponent<Rigidbody2D>();
+        SpriteRenderer mySprite = enemy.GetComponent<SpriteRenderer>();
+        myWidth = mySprite.bounds.extents.x;
+        myHeight = mySprite.bounds.extents.y;
+    }
+
+    public void Exit()
+    {
+    }
+
+    public void onTriggerEnter(Collider2D other)
+    {
+    }
+}

Assets/Resources/Scripts/AIScripts/wander.cs.meta

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