/// <summary>
/// <para>Uses a hex coordinate system to represent where a hex is in the complete grid.
/// Since grids are offset between rows or columns, it's assumed that the center of (0,0,0)
/// is at position (0,0). (0,1,-1) diagonally up right to the the original. (0, 2) is in line with the original.
/// This format assumes a TopPoint configuration. See below for coords</para>
///
/// <para>
/// z___y
/// __z y__
///xxxx 0 xxxx
/// __y z__
/// y___z
/// </para>
///
/// <para>
/// This is remember about this system. x is 0 along the x axis and increase as you go above
/// or decreases below. Same for z and y. All coordinates will always sum to zero. So coordinates
/// can be understood as distance from a line, not notches across the line
/// </para>
///
/// <para>Using answer here to calculate: https://stackoverflow.com/questions/2459402/hexagonal-grid-coordinates-to-pixel-coordinates</para>
/// </summary>
/// <param name="coordinate"></param>
/// <returns></returns>
public Vector2 EuclidianPosition(SHexCoordinate coordinate)
{
return(new Vector2(
InnerRadius * (coordinate.X + coordinate.Y * 2),
coordinate.X * HexVerticalDistance
));
}
/// <summary>
/// Returns all coordinates radial to the coordinate based on radius, including the original coordinate
/// </summary>
/// <param name="radius"></param>
/// <returns></returns>
public SHexCoordinate[] RadialStep(int radius)
{
List <SHexCoordinate> coords = new List <SHexCoordinate>()
{
this
};
SHexCoordinate currentCoord = this;
// step in rings to find coords
for (int ring = 1; ring <= radius; ring++)
{
currentCoord = currentCoord.Step(EDirection.XNegZ);
// each ring has 6 segments
for (int segment = 0; segment < 6; segment++)
{
// each step needs to be calculated in a particular direction with ring steps
for (int step = 0; step < ring; step++)
{
currentCoord = currentCoord.Step(ClockWiseDirections[segment]);
coords.Add(currentCoord);
}
}
}
return(coords.ToArray());
}
/// <summary>
/// Returns neighbour coordinates of the input coordinate
/// </summary>
/// <param name="coordinate"></param>
/// <returns></returns>
public SHexCoordinate[] GetNeighbours(SHexCoordinate coordinate)
{
return(new SHexCoordinate[]
{
GetNeighbour(coordinate, EHexDirection.UP_RIGHT),
GetNeighbour(coordinate, EHexDirection.RIGHT),
GetNeighbour(coordinate, EHexDirection.DOWN_RIGHT),
GetNeighbour(coordinate, EHexDirection.DOWN_LEFT),
GetNeighbour(coordinate, EHexDirection.LEFT),
GetNeighbour(coordinate, EHexDirection.UP_LEFT)
});
}
/// <summary>
/// Returns the neighbouring hex coordinate in a direction
/// </summary>
/// <param name="coordinate"></param>
/// <param name="direction"></param>
/// <returns></returns>
public SHexCoordinate GetNeighbour(SHexCoordinate coordinate, EHexDirection direction)
{
switch (direction)
{
case EHexDirection.UP_RIGHT: return(new SHexCoordinate(coordinate.X + 1, coordinate.Y));
case EHexDirection.RIGHT: return(new SHexCoordinate(coordinate.X, coordinate.Y + 1));
case EHexDirection.DOWN_RIGHT: return(new SHexCoordinate(coordinate.X - 1, coordinate.Y + 1));
case EHexDirection.DOWN_LEFT: return(new SHexCoordinate(coordinate.X - 1, coordinate.Y));
case EHexDirection.LEFT: return(new SHexCoordinate(coordinate.X, coordinate.Y - 1));
case EHexDirection.UP_LEFT: return(new SHexCoordinate(coordinate.X + 1, coordinate.Y - 1));
}
return(SHexCoordinate.Zero);
}
/// <summary>
/// Construct a 2D array of Hexcoordinates to represent the grid
/// </summary>
/// <param name="dimensions"></param>
public HexGrid2D(DiscreteVector2 dimensions)
{
Grid = SHexCoordinate.Grid2D(dimensions);
}
/// <summary>
/// Print the SHexCooridinate in the format [x, y, z]
/// </summary>
/// <param name="coord"></param>
public static string Print(this SHexCoordinate c)
{
return($"[{c.X}, {c.Y}, {c.Z}]");
}
/// <summary>
/// Returns the euclidian position of a hex based on coords
/// </summary>
/// <param name="coord"></param>
/// <returns></returns>
public Vector3 GetPosition(SHexCoordinate coord)
{
Vector2 pos = _converter.Calculator.EuclidianPosition(coord);
return(new Vector3(pos.x + transform.position.x, transform.position.y, pos.y + transform.position.z));
}
