void Knight::calcTrajectory()
{
//Knights can only move in 3-long 2-short L shapes
for(Position_t m : {Position_t( 1, -2)
,Position_t( 2, -1)
,Position_t( 2, 1)
,Position_t( 1, 2)
,Position_t(-1, 2)
,Position_t(-2, 1)
,Position_t(-2, -1)
,Position_t(-1, -2)})
{
Position_t t = Position_t(pos).move(m.x, m.y);
addTrajectory(t);
addCapturing(t);
}
}
void King::calcTrajectory()
{
//Kings can move one space in all eight directions
using Dir = util::Direction;
for(Dir d : {Dir::North
,Dir::NorthEast
,Dir::East
,Dir::SouthEast
,Dir::South
,Dir::SouthWest
,Dir::West
,Dir::NorthWest})
{
Position_t t = Position_t(pos).move(d);
addTrajectory(t);
addCapturing(t);
}
}
void Rook::calcTrajectory()
{
//Rooks can move infinitely in the four straight directions
using Dir = util::Direction;
for(Dir d : {Dir::North
,Dir::East
,Dir::South
,Dir::West})
{
Position_t t;
for(signed i = 1; board.valid(t = Position_t(pos).move(d, i)); ++i)
{
addCapturing(t);
if(!board.occupied(t))
{
addTrajectory(t);
}
else break; //can't jump over pieces
}
}
}
