/* Returns true if coordinates C are invalid for grid size P */
public static bool OutOfBounds(this HexParameters P, HexCoordinates C)
{
int w = P.A;
int h = P.Height();
if (C.Y < 0 || C.Y >= h)
{
return(true);
}
int offset = 0;
int y = 0;
while (y < C.Y)
{
y++;
if (y >= P.B)
{
w--; offset++;
}
if (y < P.C)
{
w++;
}
}
if (C.X < offset || C.X >= w + offset)
{
return(true);
}
return(false);
}
/* Finds valid coordinate from input coordinate */
public static HexCoordinates FindInBounds(this HexParameters P, HexCoordinates C)
{
if (!ValidParameters(P))
{
return(C);
}
HexCoordinates c = C;
int h = P.Height();
while (P.OutOfBounds(c))
{
if (c.Y < 0)
{
c = c.Shift(0, 1);
}
else if (c.Y >= h)
{
c = c.Shift(0, -1);
}
else if (c.X < 0 || c.X - c.Y + P.B <= 0)
{
c = c.Shift(1, 0);
}
else
{
c = c.Shift(-1, 0);
}
}
return(c);
}
/* Build array of HexCoordinates corresponding to a convex grid
* First cell is (0,0); builds left-to-right, top-to-bottom */
public static HexCoordinates[] BuildHexGrid(HexParameters P)
{
int gridSize = P.GridSize();
HexCoordinates[] coordinates = new HexCoordinates[gridSize];
int i = 0;
int w = P.A;
int h = P.Height();
int offset = 0;
int y = 0;
while (y < h)
{
for (int x = 0; x < w; x++)
{
coordinates[i++] = new HexCoordinates(x + offset, y);
}
y++;
if (y >= P.B)
{
w--; offset++;
}
if (y < P.C)
{
w++;
}
}
return(coordinates);
}
