using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class DrawLineByMouse : MonoBehaviour {

    //画线组件预制体
    public Transform gestureOnScreenPrefab;

    private int strokeId = -1;

    private Vector3 virtualKeyPosition = Vector2.zero;
    private Rect drawArea;
    private RuntimePlatform platform;
    private int vertexCount = 0;

    private List<LineRenderer> gestureLinesRenderer = new List<LineRenderer>();
    private LineRenderer currentGestureLineRenderer;

    //GUI
    private string message="what is this ?";
    private bool recognized;
    private string newGestureName = "";

    void Start()
    {
        platform = Application.platform;
        drawArea = new Rect(0, 0, Screen.width - Screen.width / 3, Screen.height);
    }

    void Update()
    {

        if (platform == RuntimePlatform.Android || platform == RuntimePlatform.IPhonePlayer)
        {
            if (Input.touchCount > 0)
            {
                virtualKeyPosition = new Vector3(Input.GetTouch(0).position.x, Input.GetTouch(0).position.y);
            }
        }
        else
        {
            if (Input.GetMouseButton(0))
            {
                virtualKeyPosition = new Vector3(Input.mousePosition.x, Input.mousePosition.y);
            }
        }

        if (drawArea.Contains(virtualKeyPosition))
        {

            if (Input.GetMouseButtonDown(0))
            {
               ++strokeId;

               // Transform tmpGesture = Instantiate(gestureOnScreenPrefab, transform.position, transform.rotation) as Transform;
               // currentGestureLineRenderer = tmpGesture.GetComponent<LineRenderer>();

                GameObject go = new GameObject("LineRenderer");
                go.transform.position = Camera.main.transform.position;
                go.transform.rotation = Camera.main.transform.rotation;
                currentGestureLineRenderer = go.AddComponent<LineRenderer>();
              
                currentGestureLineRenderer.startWidth = 0.1f;

                gestureLinesRenderer.Add(currentGestureLineRenderer);

                vertexCount = 0;
            }

            if (Input.GetMouseButton(0))
            {            
                currentGestureLineRenderer.SetVertexCount(++vertexCount);
                currentGestureLineRenderer.SetPosition(vertexCount - 1, Camera.main.ScreenToWorldPoint(new Vector3(virtualKeyPosition.x, virtualKeyPosition.y, 10)));
            }
        }
    }

    void OnGUI()
    {

        GUI.Box(drawArea, "Draw Area");

        GUI.Label(new Rect(10, Screen.height - 40, 500, 50), message);

        if (GUI.Button(new Rect(Screen.width - 100, 10, 100, 30), "clear line"))
        {
            foreach (LineRenderer lineRenderer in gestureLinesRenderer)
            {
                lineRenderer.SetVertexCount(0);
                Destroy(lineRenderer.gameObject);
            }
            gestureLinesRenderer.Clear();
            recognized = true;

        }
    }
}