public IEnumerable <HexCoords> CompoundArc(uint minRadius, uint maxRadius, HexFacing begin, HexFacing end)
{
for (uint radius = minRadius; radius <= maxRadius; radius++)
{
foreach (HexCoords loc in Arc(radius, begin, end))
{
yield return(loc);
}
}
}
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 static IEnumerable <HexFacing> CompassTurnCCW(this HexFacing facing, HexFacing final)
{
HexFacing current = facing;
while (current != final)
{
yield return(current);
current = current.Apply(HexRotation.CCW);
}
yield return(final);
}
public static HexCoords ToOffset(this HexFacing facing)
{
switch (facing)
{
case HexFacing.xy: return(HexCoords.XY);
case HexFacing.xz: return(HexCoords.XZ);
case HexFacing.yz: return(HexCoords.YZ);
case HexFacing.yx: return(HexCoords.YX);
case HexFacing.zx: return(HexCoords.ZX);
case HexFacing.zy: return(HexCoords.ZY);
default: return(HexCoords.O);
}
}
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)
{
return(facing.CompassTurnCW(HexRotation.CCW));
}
public static IEnumerable <HexFacing> CompassTurnCW(this HexFacing facing, HexRotation rot)
{
return(facing.CompassTurnCW(facing.Apply(rot)));
}
public static HexFacing Rotate(this HexFacing facing, int CWcount)
{
return(facing.Apply(new HexRotation(CWcount)));
}
