UnityEngine.UI.Extensions.UICornerCut.AddSquare(UnityEngine.Vector2, UnityEngine.Vector2, UnityEngine.Vector2, UnityEngine.Vector2, UnityEngine.Rect, UnityEngine.Color32, UnityEngine.UI.VertexHelper)

protected override void OnPopulateMesh(VertexHelper vh)
        {
            var rect = rectTransform.rect;
            var rectNew = rect;

            Color32 color32 = color;
            bool up = m_cutUL | m_cutUR;
            bool down = m_cutLL | m_cutLR;
            bool left = m_cutLL | m_cutUL;
            bool right = m_cutLR | m_cutUR;
            bool any = up | down;

            if (any && cornerSize.sqrMagnitude > 0)
            {

                //nibble off the sides
                vh.Clear();
                if (left)
                    rectNew.xMin += cornerSize.x;
                if (down)
                    rectNew.yMin += cornerSize.y;
                if (up)
                    rectNew.yMax -= cornerSize.y;
                if (right)
                    rectNew.xMax -= cornerSize.x;

                //add two squares to the main square
                Vector2 ul, ur, ll, lr;

                if (m_makeColumns)
                {
                    ul = new Vector2(rect.xMin, m_cutUL ? rectNew.yMax : rect.yMax);
                    ur = new Vector2(rect.xMax, m_cutUR ? rectNew.yMax : rect.yMax);
                    ll = new Vector2(rect.xMin, m_cutLL ? rectNew.yMin : rect.yMin);
                    lr = new Vector2(rect.xMax, m_cutLR ? rectNew.yMin : rect.yMin);

                    if (left)
                        AddSquare(
                            ll, ul,
                            new Vector2(rectNew.xMin, rect.yMax),
                            new Vector2(rectNew.xMin, rect.yMin),
                            rect, m_useColorUp ? m_colorUp : color32, vh);
                    if (right)
                        AddSquare(
                            ur, lr,
                            new Vector2(rectNew.xMax, rect.yMin),
                            new Vector2(rectNew.xMax, rect.yMax),
                            rect, m_useColorDown ? m_colorDown : color32, vh);
                }
                else
                {
                    ul = new Vector2(m_cutUL ? rectNew.xMin : rect.xMin, rect.yMax);
                    ur = new Vector2(m_cutUR ? rectNew.xMax : rect.xMax, rect.yMax);
                    ll = new Vector2(m_cutLL ? rectNew.xMin : rect.xMin, rect.yMin);
                    lr = new Vector2(m_cutLR ? rectNew.xMax : rect.xMax, rect.yMin);
                    if (down)
                        AddSquare(
                            lr, ll,
                            new Vector2(rect.xMin, rectNew.yMin),
                            new Vector2(rect.xMax, rectNew.yMin),
                            rect, m_useColorDown ? m_colorDown : color32, vh);
                    if (up)
                        AddSquare(
                            ul, ur,
                            new Vector2(rect.xMax, rectNew.yMax),
                            new Vector2(rect.xMin, rectNew.yMax),
                            rect, m_useColorUp ? m_colorUp : color32, vh);
                }

                //center
                if (m_makeColumns)
                    AddSquare(new Rect(rectNew.xMin, rect.yMin, rectNew.width, rect.height), rect, color32, vh);
                else
                    AddSquare(new Rect(rect.xMin, rectNew.yMin, rect.width, rectNew.height), rect, color32, vh);

            }
        }