//Modified by Dastardly Banana to add radar size configuration, different colors for enemies in different states (patrolling or chasing), ability to move radar to either one of 9 preset locations or to custom location.

//some lines are particular to our AI script, you will need to change "EnemyAINew" to the name of your AI script, and change "isChasing" to the boolean within that AI script that is true when the enemy is active/can see the player/is chasing the player.

var blip : Texture; // texture to use when the enemy isn't chasing
var blipChasing : Texture; //When Chasing
var radarBG : Texture;

var centerObject : Transform;
var mapScale = 0.3;
var mapSizePercent = 15;

var checkAIscript : boolean = true;
var enemyTag = "Enemy";

enum radarLocationValues {topLeft, topCenter, topRight, middleLeft, middleCenter, middleRight, bottomLeft, bottomCenter, bottomRight, custom}
var radarLocation : radarLocationValues = radarLocationValues.bottomLeft;

private var mapWidth : float;
private var mapHeight : float;
private var mapCenter : Vector2;
var mapCenterCustom : Vector2;

function Start () {
    setMapLocation();  
}

function OnGUI () {
//  GUI.matrix = Matrix4x4.TRS (Vector3.zero, Quaternion.identity, Vector3(Screen.width / 600.0, Screen.height / 450.0, 1));

    // Draw player blip (centerObject)
    bX=centerObject.transform.position.x * mapScale;
    bY=centerObject.transform.position.z * mapScale;  
    GUI.DrawTexture(Rect(mapCenter.x - mapWidth/2,mapCenter.y-mapHeight/2,mapWidth,mapHeight),radarBG);
    
    // Draw blips for Enemies
    DrawBlipsForEnemies();
    
}
  
function drawBlip(go,aTexture){
    
    centerPos=centerObject.position;
    extPos=go.transform.position;
    
    // first we need to get the distance of the enemy from the player
    dist=Vector3.Distance(centerPos,extPos);
    
    dx=centerPos.x-extPos.x; // how far to the side of the player is the enemy?
    dz=centerPos.z-extPos.z; // how far in front or behind the player is the enemy?
    
    // what's the angle to turn to face the enemy - compensating for the player's turning?
    deltay=Mathf.Atan2(dx,dz)*Mathf.Rad2Deg - 270 - centerObject.eulerAngles.y;
    
    // just basic trigonometry to find the point x,y (enemy's location) given the angle deltay
    bX=dist*Mathf.Cos(deltay * Mathf.Deg2Rad);
    bY=dist*Mathf.Sin(deltay * Mathf.Deg2Rad);
    
    bX=bX*mapScale; // scales down the x-coordinate so that the plot stays within our radar
    bY=bY*mapScale; // scales down the y-coordinate so that the plot stays within our radar
    
    if(dist<=mapWidth*.5/mapScale){
        // this is the diameter of our largest radar circle
       GUI.DrawTexture(Rect(mapCenter.x+bX,mapCenter.y+bY,4,4),aTexture);

    }

}

function DrawBlipsForEnemies(){
    //You will need to replace isChasing with a variable from your AI script that is true when     the enemy is chasing the player, or doing watever you want it to be doing when it is red on    the radar.
    
    //You will need to replace "EnemyAINew with the name of your AI script
    
    // Find all game objects tagged Enemy
    var gos : GameObject[];
    gos = GameObject.FindGameObjectsWithTag(enemyTag);

    var distance = Mathf.Infinity;
    var position = transform.position;

    // Iterate through them and call drawBlip function
    for (var go : GameObject in gos)  {
          var blipChoice : Texture = blip;
          if(checkAIscript){
                var aiScript : EnemyAI = go.GetComponent("EnemyAI");
            if(aiScript.isChasing)
                    blipChoice = blipChasing;
        }
        drawBlip(go,blipChoice);
    }

}

function setMapLocation () {
    mapWidth = Screen.width*mapSizePercent/100.0;
    mapHeight = mapWidth;

public class Radar : MonoBehaviour
{

    public enum RadarTypes : int {Textured, Round, Transparent};
    public enum RadarLocations : int {TopLeft, TopCenter, TopRight, BottomLeft, BottomCenter, BottomRight, Left, Center, Right, Custom};
    
    // Display Location
    public RadarLocations radarLocation = RadarLocations.BottomCenter;
    public Vector2 radarLocationCustom;
    public RadarTypes radarType = RadarTypes.Round;
    public Color radarBackgroundA = new Color(255, 255, 0);
    public Color radarBackgroundB = new Color(0, 255, 255);
    public Texture2D radarTexture;
    public float radarSize = 0.20f;  // The amount of the screen the radar will use
    public float radarZoom = 0.60f;
    
    // Center Object information
    public bool   radarCenterActive;
    public Color  radarCenterColor = new Color(255, 255, 255);
    public string radarCenterTag;
    
    // Blip information
    public bool   radarBlip1Active;
    public Color  radarBlip1Color = new Color(0, 0, 255);
    public string radarBlip1Tag;

    public bool   radarBlip2Active;
    public Color  radarBlip2Color = new Color(0, 255, 0);
    public string radarBlip2Tag;

    public bool   radarBlip3Active;
    public Color  radarBlip3Color = new Color(255, 0, 0);
    public string radarBlip3Tag;

    public bool   radarBlip4Active;
    public Color  radarBlip4Color = new Color(255, 0, 255);
    public string radarBlip4Tag;
    
    // Internal vars
    private GameObject _centerObject;
    private int        _radarWidth;
    private int        _radarHeight;
    private Vector2    _radarCenter;
    private Texture2D  _radarCenterTexture;
    private Texture2D  _radarBlip1Texture;
    private Texture2D  _radarBlip2Texture;
    private Texture2D  _radarBlip3Texture;
    private Texture2D  _radarBlip4Texture;

    // Initialize the radar
    void Start ()
    {
        // Determine the size of the radar
        _radarWidth = (int)(Screen.width * radarSize);
        _radarHeight = _radarWidth;
        
        // Get the location of the radar
        setRadarLocation();

        // Create the blip textures
        _radarCenterTexture = new Texture2D(3, 3, TextureFormat.RGB24, false);
        _radarBlip1Texture = new Texture2D(3, 3, TextureFormat.RGB24, false);
        _radarBlip2Texture = new Texture2D(3, 3, TextureFormat.RGB24, false);
        _radarBlip3Texture = new Texture2D(3, 3, TextureFormat.RGB24, false);
        _radarBlip4Texture = new Texture2D(3, 3, TextureFormat.RGB24, false);
        
        CreateBlipTexture(_radarCenterTexture, radarCenterColor);
        CreateBlipTexture(_radarBlip1Texture, radarBlip1Color);
        CreateBlipTexture(_radarBlip2Texture, radarBlip2Color);
        CreateBlipTexture(_radarBlip3Texture, radarBlip3Color);
        CreateBlipTexture(_radarBlip4Texture, radarBlip4Color);
        
        // Setup the radar background texture
        if (radarType != RadarTypes.Textured)
        {
            radarTexture = new Texture2D(_radarWidth, _radarHeight, TextureFormat.RGB24, false);
            CreateRoundTexture(radarTexture, radarBackgroundA, radarBackgroundB);
        }
        
        // Get our center object
        GameObject[] gos;
        gos = GameObject.FindGameObjectsWithTag(radarCenterTag);
        _centerObject = gos[0];
    }
    
    // Update is called once per frame
    void OnGUI ()
    {
        GameObject[] gos;

        // Draw th radar background
        if (radarType != RadarTypes.Transparent)
        {
            Rect radarRect = new Rect(_radarCenter.x - _radarWidth / 2, _radarCenter.y - _radarHeight / 2, _radarWidth, _radarHeight);
            GUI.DrawTexture(radarRect, radarTexture);
        }

        // Draw blips
        if (radarBlip1Active)
        {
            // Find all game objects
            gos = GameObject.FindGameObjectsWithTag(radarBlip1Tag);
  
            // Iterate through them and call drawBlip function
            foreach (GameObject go in gos)
            {
                drawBlip(go, _radarBlip1Texture);
            }
        }
        if (radarBlip2Active)
        {
            gos = GameObject.FindGameObjectsWithTag(radarBlip2Tag);
  
            foreach (GameObject go in gos)
            {
                drawBlip(go, _radarBlip2Texture);
            }
        }
        if (radarBlip3Active)
        {
            gos = GameObject.FindGameObjectsWithTag(radarBlip3Tag);
  
            foreach (GameObject go in gos)
            {
                drawBlip(go, _radarBlip3Texture);
            }
        }
        if (radarBlip4Active)
        {
            gos = GameObject.FindGameObjectsWithTag(radarBlip4Tag);
  
            foreach (GameObject go in gos)
            {
                drawBlip(go, _radarBlip4Texture);
            }
        }

        // Draw center oject
        if (radarCenterActive)
        {
            Rect centerRect = new Rect(_radarCenter.x - 1.5f, _radarCenter.y - 1.5f, 3, 3);
            GUI.DrawTexture(centerRect, _radarCenterTexture);
        }
    }
    
    // Draw a blip for an object
    void drawBlip(GameObject go, Texture2D blipTexture)
    {
        if (_centerObject)
        {
            Vector3 centerPos = _centerObject.transform.position;
            Vector3 extPos = go.transform.position;
    
            // Get the distance to the object from the centerObject
            float dist = Vector3.Distance(centerPos, extPos);

            // Get the object's offset from the centerObject
            float bX = centerPos.x - extPos.x;
            float bY = centerPos.z - extPos.z;
    
            // Scale the objects position to fit within the radar
            bX = bX * radarZoom;
            bY = bY * radarZoom;
    
            // For a round radar, make sure we are within the circle
            if(dist <= (_radarWidth - 2) * 0.5 / radarZoom)
            {
                Rect clipRect = new Rect(_radarCenter.x - bX - 1.5f, _radarCenter.y + bY - 1.5f, 3, 3);
                GUI.DrawTexture(clipRect, blipTexture);
            }
        }
    }

    // Create the blip textures
    void CreateBlipTexture(Texture2D tex, Color c)
    {
        Color[] cols = {c, c, c, c, c, c, c, c, c};
        tex.SetPixels(cols, 0);
        tex.Apply();
    }
    
    // Create a round bullseye texture
    void CreateRoundTexture(Texture2D tex, Color a, Color b)
    {
        Color c = new Color(0, 0, 0);
        int size = (int)((_radarWidth / 2) / 4);
        
        // Clear the texture
        for (int x = 0; x < _radarWidth; x++)
        {
            for (int y = 0; y < _radarWidth; y++)
            {
                tex.SetPixel(x, y, c);
            }
        }
        
        for (int r = 4; r > 0; r--)
        {
            if (r % 2 == 0)
            {
                c = a;
            }
            else
            {
                c = b;
            }
            DrawFilledCircle(tex, (int)(_radarWidth / 2), (int)(_radarHeight / 2), (r * size), c);
        }
        
        tex.Apply();
    }
    
    // Draw a filled colored circle onto a texture
    void DrawFilledCircle(Texture2D tex, int cx, int cy, int r, Color c)
    {
        for (int x = -r; x < r ; x++)
        {
            int height = (int)Mathf.Sqrt(r * r - x * x);

            for (int y = -height; y < height; y++)
                tex.SetPixel(x + cx, y + cy, c);
        }
    }

    // Figure out where to put the radar
    void setRadarLocation()
    {
        // Sets radarCenter based on enum selection
        if(radarLocation == RadarLocations.TopLeft)
        {
            _radarCenter = new Vector2(_radarWidth / 2, _radarHeight / 2);
        }
        else if(radarLocation == RadarLocations.TopCenter)
        {
            _radarCenter = new Vector2(Screen.width / 2, _radarHeight / 2);
        }
        else if(radarLocation == RadarLocations.TopRight)
        {
            _radarCenter = new Vector2(Screen.width - _radarWidth / 2, _radarHeight / 2);
        }
        else if(radarLocation == RadarLocations.Left)
        {
            _radarCenter = new Vector2(_radarWidth / 2, Screen.height / 2);
        }
        else if(radarLocation == RadarLocations.Center)
        {
            _radarCenter = new Vector2(Screen.width / 2, Screen.height / 2);
        }
        else if(radarLocation == RadarLocations.Right)
        {
            _radarCenter = new Vector2(Screen.width - _radarWidth / 2, Screen.height / 2);
        }
        else if(radarLocation == RadarLocations.BottomLeft)
        {
            _radarCenter = new Vector2(_radarWidth / 2, Screen.height - _radarHeight / 2);
        }
        else if(radarLocation == RadarLocations.BottomCenter)
        {
            _radarCenter = new Vector2(Screen.width / 2, Screen.height - _radarHeight / 2);
        }
            else if(radarLocation == RadarLocations.BottomRight)
        {
            _radarCenter = new Vector2(Screen.width - _radarWidth / 2, Screen.height - _radarHeight / 2);
        }
            else if(radarLocation == RadarLocations.Custom)
        {
            _radarCenter = radarLocationCustom;
        }
    }