Battlesnake/Byte-snake-engine
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Isolate and improve logic to determine default move.

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This commit is contained in:
bvanvugt 2022-01-11 22:44:37 +00:00
parent a1ee890dde
commit 020303a8dd
2 changed files with 107 additions and 19 deletions
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60
standard.go
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@ -98,8 +98,20 @@ func (r *StandardRuleset) moveSnakes(b *BoardState, moves []SnakeMove) error {
for _, move := range moves {
if move.ID == snake.ID {
var newHead = Point{}
appliedMove := move.Move
switch move.Move {
case MoveUp, MoveDown, MoveRight, MoveLeft:
break
default:
appliedMove = r.getDefaultMove(snake.Body)
}
newHead := Point{}
switch appliedMove {
// Guaranteed to be one of these options given the clause above
case MoveUp:
newHead.X = snake.Body[0].X
newHead.Y = snake.Body[0].Y + 1
case MoveDown:
newHead.X = snake.Body[0].X
newHead.Y = snake.Body[0].Y - 1
@ -109,24 +121,6 @@ func (r *StandardRuleset) moveSnakes(b *BoardState, moves []SnakeMove) error {
case MoveRight:
newHead.X = snake.Body[0].X + 1
newHead.Y = snake.Body[0].Y
case MoveUp:
newHead.X = snake.Body[0].X
newHead.Y = snake.Body[0].Y + 1
default:
// Default to UP
var dX int32 = 0
var dY int32 = 1
// If neck is available, use neck to determine last direction
if len(snake.Body) >= 2 {
dX = snake.Body[0].X - snake.Body[1].X
dY = snake.Body[0].Y - snake.Body[1].Y
if dX == 0 && dY == 0 {
dY = 1 // Move up if no last move was made
}
}
// Apply
newHead.X = snake.Body[0].X + dX
newHead.Y = snake.Body[0].Y + dY
}
// Append new head, pop old tail
@ -137,6 +131,34 @@ func (r *StandardRuleset) moveSnakes(b *BoardState, moves []SnakeMove) error {
return nil
}
func (r *StandardRuleset) getDefaultMove(snakeBody []Point) string {
if len(snakeBody) >= 2 {
// Use neck to determine last move made
head, neck := snakeBody[0], snakeBody[1]
// Situations where neck is next to head
if head.X == neck.X+1 {
return MoveRight
} else if head.X == neck.X-1 {
return MoveLeft
} else if head.Y == neck.Y+1 {
return MoveUp
} else if head.Y == neck.Y-1 {
return MoveDown
}
// Consider the wrapped cases using zero axis to anchor
if head.X == 0 && neck.X > 0 {
return MoveRight
} else if neck.X == 0 && head.X > 0 {
return MoveLeft
} else if head.Y == 0 && neck.Y > 0 {
return MoveUp
} else if neck.Y == 0 && head.Y > 0 {
return MoveDown
}
}
return MoveUp
}
func (r *StandardRuleset) reduceSnakeHealth(b *BoardState) error {
for i := 0; i < len(b.Snakes); i++ {
if b.Snakes[i].EliminatedCause == NotEliminated {