public static Cell GetByPosition(ref PositionInt position, Cell[][] cells)
{
Cell result = null;
// normalize position to create an illusion of an endless, borderless plate
if (position.GetX() >= cells.Length)
{
position = new PositionInt(position.GetX() - cells.Length, position.GetY());
}
if (position.GetY() >= cells[0].Length)
{
position = new PositionInt(position.GetX(), position.GetY() - cells[0].Length);
}
if (position.GetX() < 0)
{
position = new PositionInt(cells.Length + position.GetX(), position.GetY());
}
if (position.GetY() < 0)
{
position = new PositionInt(position.GetX(), cells[0].Length + position.GetY());
}
try
{
result = cells[position.GetX()][position.GetY()];
}
catch (IndexOutOfRangeException e)
{
result = Cell.GetByPosition(ref position, cells);
}
return(result);
}
private Cell UpdateCell(PositionInt position, Cell[][] cells, GameOfLifeRules rules)
{
Cell result = new Cell();
result.isAlive = false;
int numberOfAliveNeighbours = 0;
// cell position relative to the current cell,
// find living neighbours
for (int x = -1; x <= 1; x++)
{
for (int y = -1; y <= 1; y++)
{
if (!((x == 0) && (y == 0))) // if not at the center
{
// position will then be normalized in Cell.GetByPosition() to create an 'endless' plate
PositionInt neighbourPosition = new PositionInt(position.GetX() + x, position.GetY() + y);
Cell neighbourCell = Cell.GetByPosition(ref neighbourPosition, cells);
if (neighbourCell.isAlive)
{
numberOfAliveNeighbours++;
}
}
}
}
if (CompareWithRule(numberOfAliveNeighbours, rules.neighbours_ToCreate))
{
result.isAlive = true;
}
if (CompareWithRule(numberOfAliveNeighbours, rules.neighbours_ToSurvive))
{
result.isAlive = true;
}
else
if (CompareWithRule(numberOfAliveNeighbours, rules.neighbours_ToDie))
{
result.isAlive = false;
}
return(result);
}