public bool CheckCanPlace(IGrid grid, int x, int y, int xDir, int yDir, bool swap)
{
//no need to rotate symmetric pieces - consider the move impossible
if (_immutable && (xDir == -1 || yDir == -1 || swap))
{
return(false);
}
foreach (var step in _steps)
{
var coord = CalculateCoord(step.X, step.Y, x, y, xDir, yDir, swap);
if (!grid.CheckCanPlace(coord.X, coord.Y))
{
return(false);
}
}
return(true);
}
private bool IsPossibleGrid(IGrid grid)
{
for (int y = 0; y < grid.Height; y++)
{
for (int x = 0; x < grid.Width; x++)
{
if (grid.CheckCanPlace(x, y) && !grid.CheckCanPlace(x + 1, y) && !grid.CheckCanPlace(x - 1, y) && !grid.CheckCanPlace(x, y + 1) && !grid.CheckCanPlace(x, y - 1))
{
return(false);
}
if (grid.CheckCanPlace(x, y) && grid.CheckCanPlace(x + 1, y) &&
!grid.CheckCanPlace(x - 1, y) && !grid.CheckCanPlace(x, y + 1) && !grid.CheckCanPlace(x, y - 1) &&
!grid.CheckCanPlace(x + 2, y) && !grid.CheckCanPlace(x + 1, y + 1) && !grid.CheckCanPlace(x + 1, y - 1))
{
return(false);
}
if (grid.CheckCanPlace(x, y) && grid.CheckCanPlace(x, y + 1) &&
!grid.CheckCanPlace(x, y - 1) && !grid.CheckCanPlace(x + 1, y) && !grid.CheckCanPlace(x - 1, y) &&
!grid.CheckCanPlace(x, y + 2) && !grid.CheckCanPlace(x + 1, y + 1) && !grid.CheckCanPlace(x - 1, y + 1))
{
return(false);
}
}
}
return(true);
}