public static HexFacing Apply(this HexFacing facing, HexRotation rot)
{
if (facing == HexFacing.bad)
{
return(HexFacing.bad);
}
else
{
return((HexFacing)NumUtil.WrapPos((int)facing - rot.CWcount, 6));
}
}
public HexCoords Rotate(HexCoords center, HexRotation rot)
{
HexCoords d = this - center;
switch (rot.CWcount)
{
default:
case 0: return(center + d); // x, y, z
case 1: return(center + new HexCoords(-z, -x)); // -y
case 2: return(center + new HexCoords(y, z)); // x
case 3: return(center + new HexCoords(-x, -y)); // -z
case 4: return(center + new HexCoords(z, x)); // y
case 5: return(center + new HexCoords(-y, -z)); // -x
}
}
public IEnumerable <HexCoords> Arc(uint radius, HexFacing begin, HexFacing end)
{
HexCoords cursor = this + (begin.ToOffset() * (int)radius);
// Yielding the initial cursor position is unique to arcs,
// and is why this code works at radius 0 while rings do not.
yield return(cursor);
// We need to track our travel facing.
// When following a circle, we start at the southwest corner heading north.
// Southwest to north is rotating CW twice.
// Any corner you start at, your travel on that side will be CW twice.
HexRotation turnIntoSide = new HexRotation(2);
foreach (HexFacing facing in begin.Rotate(2).CompassTurnCW(end.Rotate(1)))
{
for (int idx = 0; idx < radius; idx++)
{
cursor += facing;
yield return(cursor);
}
}
}
public static IEnumerable <HexFacing> CompassTurnCW(this HexFacing facing, HexRotation rot)
{
return(facing.CompassTurnCW(facing.Apply(rot)));
}
public HexCoords Rotate(HexRotation rot)
{
return(Rotate(HexCoords.O, rot));
}