using UnityEngine;
using UnityEngine.SceneManagement;
using System.Collections.Generic;
using OpenCVForUnity.CoreModule;
using OpenCVForUnity.ImgprocModule;
using OpenCVForUnity.UnityUtils;

namespace OpenCVForUnityExample
{
    /// <summary>
    /// ConvexHull Example
    /// http://docs.opencv.org/trunk/d7/d1d/tutorial_hull.html
    /// </summary>
    public class ConvexHullExample : MonoBehaviour
    {
        // Use this for initialization
        void Start ()
        {
            Mat imgMat = new Mat (500, 500, CvType.CV_8UC3, new Scalar (0, 0, 0));
            Debug.Log ("imgMat.ToString() " + imgMat.ToString ());

            int rand_num = 50;
            MatOfPoint pointsMat = new MatOfPoint ();
            pointsMat.alloc (rand_num);

            Core.randu (pointsMat, 100, 400);

            Point[] points = pointsMat.toArray ();
            for (int i = 0; i < rand_num; ++i) {
                Imgproc.circle (imgMat, points [i], 2, new Scalar (255, 255, 255), -1);
            }

    
            MatOfInt hullInt = new MatOfInt ();
            Imgproc.convexHull (pointsMat, hullInt);


            List<Point> pointMatList = pointsMat.toList ();
            List<int> hullIntList = hullInt.toList ();
            List<Point> hullPointList = new List<Point> ();

            for (int j = 0; j < hullInt.toList ().Count; j++) {
                hullPointList.Add (pointMatList [hullIntList [j]]);
            }

            MatOfPoint hullPointMat = new MatOfPoint ();
            hullPointMat.fromList (hullPointList);

            List<MatOfPoint> hullPoints = new List<MatOfPoint> ();
            hullPoints.Add (hullPointMat);

        
            Imgproc.drawContours (imgMat, hullPoints, -1, new Scalar (0, 255, 0), 2);

            Imgproc.cvtColor (imgMat, imgMat, Imgproc.COLOR_BGR2RGB);

            Texture2D texture = new Texture2D (imgMat.cols (), imgMat.rows (), TextureFormat.RGBA32, false);
            Utils.matToTexture2D (imgMat, texture);
        
            gameObject.GetComponent<Renderer> ().material.mainTexture = texture;
        }
    
        // Update is called once per frame
        void Update ()
        {
    
        }

        /// <summary>
        /// Raises the back button click event.
        /// </summary>
        public void OnBackButtonClick ()
        {
            SceneManager.LoadScene ("OpenCVForUnityExample");
        }
    }
}