using UnityEngine;
using System.Collections;
using UnityEngine.UI;

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

namespace UnityEngine.UI
{
    public class GuideHighlightMask : MaskableGraphic,UnityEngine.ICanvasRaycastFilter
    {
        public RectTransform arrow;
        public Vector2 center = Vector2.zero;
        public Vector2 size = new Vector2(100, 100);
        public void DoUpdate()
        {
            if(arrow&&center!=arrow.anchoredPosition||size!=arrow.sizeDelta)
            {
                this.center = arrow.anchoredPosition;
                this.size = arrow.sizeDelta;
                SetAllDirty();
            }
        }
        public bool IsRaycastLocationValid(Vector2 sp,Camera eventCamera)
        {
            return !RectTransformUtility.RectangleContainsScreenPoint(arrow, sp, eventCamera);
        }

        protected override void OnFillVBO(List<UIVertex> vbo)
        {
            Vector4 outer = new Vector4(-rectTransform.pivot.x * rectTransform.rect.width,
                                     -rectTransform.pivot.y * rectTransform.rect.height,
                                     (1 - rectTransform.pivot.x) * rectTransform.rect.width,
                                     (1 - rectTransform.pivot.y) * rectTransform.rect.height);
            Vector4 inner = new Vector4(center.x - size.x / 2,
                                        center.y - size.y / 2,
                                        center.x + size.x * 0.5f,
                                        center.y + size.y * 0.5f);
            vbo.Clear();
            var vert = UIVertex.simpleVert;
            //left
            vert.position = new Vector2(outer.x,outer.y);
            vert.color = color;
            vbo.Add(vert);

            vert.position = new Vector2(outer.x, outer.w);
            vert.color = color;
            vbo.Add(vert);

            vert.position = new Vector2(outer.x, outer.w);
            vert.color = color;
            vbo.Add(vert);

            vert.position = new Vector2(outer.x, outer.y);
            vert.color = color;
            vbo.Add(vert);
            //top
            vert.position = new Vector2(outer.x, outer.w);
            vert.color = color;
            vbo.Add(vert);

            vert.position = new Vector2(outer.x, outer.w);
            vert.color = color;
            vbo.Add(vert);

            vert.position = new Vector2(outer.z, outer.w);
            vert.color = color;
            vbo.Add(vert);

            vert.position = new Vector2(outer.z, outer.w);
            vert.color = color;
            vbo.Add(vert);
            //right
            vert.position = new Vector2(outer.z, outer.y);
            vert.color = color;
            vbo.Add(vert);

            vert.position = new Vector2(outer.z, outer.w);
            vert.color = color;
            vbo.Add(vert);

            vert.position = new Vector2(outer.z, outer.w);
            vert.color = color;
            vbo.Add(vert);

            vert.position = new Vector2(outer.z, outer.y);
            vert.color = color;
            vbo.Add(vert);
            //bottom
            vert.position = new Vector2(outer.x, outer.y);
            vert.color = color;
            vbo.Add(vert);

            vert.position = new Vector2(outer.x, outer.y);
            vert.color = color;
            vbo.Add(vert);

            vert.position = new Vector2(outer.z, outer.y);
            vert.color = color;
            vbo.Add(vert);

            vert.position = new Vector2(outer.z, outer.y);
            vert.color = color;
            vbo.Add(vert);

        }
        public void Update()
        {
            DoUpdate();
        }
        void Start()
        {

        }


        
    }
}