using UnityEngine;
using System.Collections;
using System.Collections.Generic;
namespace UnityEngine.UI
{
    public class testGuied : MaskableGraphic, UnityEngine.ICanvasRaycastFilter
    {

        public RectTransform arrow;
        public Vector2 center = Vector2.zero;
        public Vector2 size = new Vector2(100, 100);

        public void DoUpdate()
        {
            // 当引导箭头位置或者大小改变后更新，注意：未处理拉伸模式
            if (arrow && center != arrow.anchoredPosition || size != arrow.sizeDelta)
            {
                this.center = arrow.anchoredPosition;
                this.size = arrow.sizeDelta;
                SetAllDirty();
            }
        }

        public bool IsRaycastLocationValid(Vector2 sp, Camera eventCamera)
        {
            // 点击在箭头框内部则无效，否则生效
            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(inner.x, outer.w);
            vert.color = color;
            vbo.Add(vert);

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

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

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

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

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

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

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

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

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

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

        private void Update()
        {
            DoUpdate();
        }
    }
}