func opponentAt(b *easyai.Board, loc easyai.Loc) bool {
if b.IsInside(loc) {
return false
}
r := b.At(loc)
if r == nil {
return false
}
return r.Faction == easyai.OpponentFaction
}
func (pf *pathfinder) RobotTick(b *easyai.Board, r *easyai.Robot) easyai.Turn {
// Immediate surrounding attacks
ds := []easyai.Direction{
easyai.North,
easyai.South,
easyai.East,
easyai.West,
}
for _, d := range ds {
loc := r.Loc.Add(d)
if opponentAt(b, loc) {
return easyai.Turn{
Kind: easyai.Attack,
Direction: d,
}
}
}
// Acquire target
tgt, ok := pf.targets[r.ID]
var opp *easyai.Robot
if ok {
opp = b.Find(func(q *easyai.Robot) bool {
return q.ID == tgt
})
}
if !ok || opp == nil {
if pf.targets == nil {
pf.targets = make(map[uint32]uint32)
}
opp := nearestOpponent(b, r.Loc)
if opp == nil {
return easyai.Turn{Kind: easyai.Wait}
}
pf.targets[r.ID] = opp.ID
}
// Move to target.
// Don't worry about collisions, since we already shot at all neighbors.
// TODO: but what about friends?
// TODO: and why don't you compute the vector angle?
switch {
case opp.Loc.X < r.Loc.X:
return easyai.Turn{
Kind: easyai.Move,
Direction: easyai.West,
}
case opp.Loc.X > r.Loc.X:
return easyai.Turn{
Kind: easyai.Move,
Direction: easyai.East,
}
case opp.Loc.Y < r.Loc.Y:
return easyai.Turn{
Kind: easyai.Move,
Direction: easyai.North,
}
case opp.Loc.Y > r.Loc.Y:
return easyai.Turn{
Kind: easyai.Move,
Direction: easyai.South,
}
}
// TODO: impossibru?
return easyai.Turn{Kind: easyai.Wait}
}