private int[] GetRectangleIndices(List <UIVertex> vertices, int[] hexIndices)
{
if (hexIndices.Length != 6)
{
return(null);
}
var result = hexIndices.Distinct().ToArray();
if (result.Length != System.Enum.GetValues(typeof(RectangleIndex)).Length)
{
return(null);
}
var upperLeftPosition = new Vector2(float.MaxValue, float.MinValue);
var lowerRightPosition = new Vector2(float.MinValue, float.MaxValue);
foreach (var position in hexIndices.Select(x => vertices[x].position))
{
upperLeftPosition.x = Mathf.Min(upperLeftPosition.x, position.x);
upperLeftPosition.y = Mathf.Max(upperLeftPosition.y, position.y);
lowerRightPosition.x = Mathf.Max(lowerRightPosition.x, position.x);
lowerRightPosition.y = Mathf.Min(lowerRightPosition.y, position.y);
}
foreach (var index in hexIndices)
{
var position = vertices[index].position;
var rectangleIndex = 0;
if (position.x == upperLeftPosition.x)
{
rectangleIndex = 0x0;
}
else if (position.x == lowerRightPosition.x)
{
rectangleIndex = 0x1;
}
else
{
return(null);
}
if (position.y == upperLeftPosition.y)
{
rectangleIndex ^= 0x0;
}
else if (position.y == lowerRightPosition.y)
{
rectangleIndex ^= 0x3;
}
else
{
return(null);
}
result[rectangleIndex] = index;
}
return(result);
}