private HexagonGroup GetGroupAtCorner(int x, int y, HexagonPiece.Edge corner)
{
if (grid[x][y].HandleEdge(corner) != corner)
{
return(new HexagonGroup());
}
int y2 = x % 2 == 0 ? y : y + 1;
switch (corner)
{
// It is important that the pieces are stored in clockwise order
case HexagonPiece.Edge.BottomLeft: return(new HexagonGroup(grid[x][y], grid[x][y - 1], grid[x - 1][y2 - 1]));
case HexagonPiece.Edge.BottomRight: return(new HexagonGroup(grid[x][y], grid[x + 1][y2 - 1], grid[x][y - 1]));
case HexagonPiece.Edge.Left: return(new HexagonGroup(grid[x][y], grid[x - 1][y2 - 1], grid[x - 1][y2]));
case HexagonPiece.Edge.Right: return(new HexagonGroup(grid[x][y], grid[x + 1][y2], grid[x + 1][y2 - 1]));
case HexagonPiece.Edge.TopLeft: return(new HexagonGroup(grid[x][y], grid[x - 1][y2], grid[x][y + 1]));
case HexagonPiece.Edge.TopRight: return(new HexagonGroup(grid[x][y], grid[x][y + 1], grid[x + 1][y2]));
default: return(new HexagonGroup());
}
}
/// <summary>
/// If points resides inside the grid, locate the group that are closest to the point
/// </summary>
/// <param name="point"></param>
/// <param name="group">false;null true; sets group to the found one.</param>
/// <returns>false; point is outside of grid, true; inside.</returns>
public bool TryGetGroup(Vector2 point, out HexagonGroup group)
{
if (point.x <= 0f || point.x >= gridSize.x || point.y <= 0f || point.y >= gridSize.y)
{
group = new HexagonGroup();
return(false);
}
// Calculate the row and column indices of the hexagon piece that the point resides inside
GetCoordinatesFrom(point, out int x, out int y);
// Find the hexagon piece's corner that is closest to the point
HexagonPiece.Edge corner = grid[x][y].HandleEdge(grid[x][y].GetClosestEdge(point - (Vector2)grid[x][y].transform.localPosition));
group = GetGroupAtCorner(x, y, corner);
return(true);
}