protected override void OnPopulateMesh(VertexHelper vh)
{
base.OnPopulateMesh(vh);
var center = (BottomLeft + UpRight) * 0.5f;
var size = new Vector2(rectTransform.rect.width, rectTransform.rect.height) * 0.5f;
vh.DrawArc(center, size, 0, Mathf.PI * 2, Sides, color);
}
