func (t *knight) GetMoves(curPos core.Position, b *Board) []core.Position {
pos := []core.Position{
curPos.Add(core.Offset{1, 2}),
curPos.Add(core.Offset{2, 1}),
curPos.Add(core.Offset{1, -2}),
curPos.Add(core.Offset{2, -1}),
curPos.Add(core.Offset{-1, 2}),
curPos.Add(core.Offset{-2, 1}),
curPos.Add(core.Offset{-1, -2}),
curPos.Add(core.Offset{-2, -1}),
}
return b.trimInvalidPos(pos, t.GetPlayer())
}
func (t *pawn) GetMoves(curPos core.Position, b *Board) []core.Position {
pos := []core.Position{}
// forward move
forward := curPos.Add(core.Offset{0, t.GetPlayer().ForwardDir()})
if b.OnBoard(forward) && b.GetPos(forward) == nil {
pos = append(pos, forward)
}
// first move
if !t.HasMoved() {
forward2 := forward.Add(core.Offset{0, t.GetPlayer().ForwardDir()})
if b.OnBoard(forward2) && b.GetPos(forward) == nil && b.GetPos(forward2) == nil {
pos = append(pos, forward2)
}
}
// captures
cap1 := curPos.Add(core.Offset{1, t.GetPlayer().ForwardDir()})
if b.isCapture(cap1, t.GetPlayer()) {
pos = append(pos, cap1)
}
cap2 := curPos.Add(core.Offset{-1, t.GetPlayer().ForwardDir()})
if b.isCapture(cap2, t.GetPlayer()) {
pos = append(pos, cap2)
}
return pos
}
func (b *Board) indexPos(v core.Position) int {
return b.index(v.Column(), v.Row())
}
func (b *Board) OnBoard(v core.Position) bool {
c := int(v.Column())
r := int(v.Row())
return c >= 0 && c < b.width && r >= 0 && r < b.height
}
func (t *king) GetMoves(curPos core.Position, b *Board) []core.Position {
pos := []core.Position{
curPos.Add(core.Offset{0, 1}),
curPos.Add(core.Offset{1, 1}),
curPos.Add(core.Offset{-1, 1}),
curPos.Add(core.Offset{0, -1}),
curPos.Add(core.Offset{1, -1}),
curPos.Add(core.Offset{-1, -1}),
curPos.Add(core.Offset{1, 0}),
curPos.Add(core.Offset{-1, 0}),
}
return b.trimInvalidPos(pos, t.GetPlayer())
}