//--------------------------------------------------------
//    [Author]:           玩个游戏
//    [  Date ]:           Wednesday, August 23, 2017
//--------------------------------------------------------
using UnityEngine;
using System.Collections;
using UnityEngine.UI;
using System.Collections.Generic;


public class OffsetImage2:Text {

    [SerializeField]
    Vector2 m_Offset;
    public Vector2 offset {
        get {
            return m_Offset;
        }
        set {
            m_Offset = value;

        }
    }

    protected override void OnPopulateMesh(VertexHelper toFill) {
        base.OnPopulateMesh(toFill);
        List<UIVertex> vertexs = new List<UIVertex>();
        toFill.GetUIVertexStream(vertexs);

        if(vertexs == null || vertexs.Count == 0) {
            return;
        }

        toFill.Clear();
        var newVertexs = new List<UIVertex>();
        var index = 1 * 6 - 1;
        for(int i = 0;i < vertexs.Count;i++) {

            var vertex = vertexs[i];
            if(i == index) {
                newVertexs.AddRange(AddHexgon(vertexs[i - 5].position,new Vector2(offset.x,font.fontSize),Color.white));
            }
            if(i > index) {
                var position = vertex.position + new Vector3(offset.x,offset.y,0);
                vertex.position = position;
            }
            newVertexs.Add(vertex);
        }


        var aaa=   this.cachedTextGenerator.verts;
        toFill.AddUIVertexTriangleStream(newVertexs);
        LayoutRebuilder.MarkLayoutForRebuild(this.rectTransform);
    }

    private UIVertex[] AddHexgon(Vector3 _startPosition,Vector2 _offset,Color _color) {

        var hexgon = new UIVertex[4];
        var positions = new Vector3[4];
        positions[0] = _startPosition;
        positions[1] = _startPosition + new Vector3(_offset.x,0,0);
        positions[2] = _startPosition + new Vector3(_offset.x,-_offset.y,0);
        positions[3] = _startPosition + new Vector3(0,-_offset.y,0);

        for(int i = 0;i < 4;i++) {
            hexgon[i] = UIUtility.PackageUIVertexUV1(positions[i],Vector2.zero,_color);
        }

        return hexgon;

    }

}