Battlesnake/Byte-snake-engine
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DEV-1703: Avoid spawning food on hazards for islands and bridges map (#112)

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* move PlaceFoodFixed and PlaceSnakesInQuadrants to maps package

* don't spawn food on hazards in islands/rivers and bridges maps
This commit is contained in:
Rob O'Dwyer 2022-09-22 16:09:01 -07:00 • committed by GitHub
parent 35e5a53005
commit e6e36ce46f
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GPG key ID: 4AEE18F83AFDEB23
5 changed files with 184 additions and 114 deletions
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63
board.go
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@ -189,11 +189,11 @@ func PlaceManySnakesDistributed(rand Rand, b *BoardState, snakeIDs []string) err
hOffset := quadHSpace / 3
vOffset := quadVSpace / 3
quads := make([]randomPositionBucket, 4)
quads := make([]RandomPositionBucket, 4)
// quad 1
quads[0] = randomPositionBucket{}
quads[0].fill(
quads[0] = RandomPositionBucket{}
quads[0].Fill(
Point{X: hOffset, Y: vOffset},
Point{X: quadHSpace - hOffset, Y: vOffset},
Point{X: hOffset, Y: quadVSpace - vOffset},
@ -201,27 +201,27 @@ func PlaceManySnakesDistributed(rand Rand, b *BoardState, snakeIDs []string) err
)
// quad 2
quads[1] = randomPositionBucket{}
quads[1] = RandomPositionBucket{}
for _, p := range quads[0].positions {
quads[1].fill(Point{X: b.Width - p.X - 1, Y: p.Y})
quads[1].Fill(Point{X: b.Width - p.X - 1, Y: p.Y})
}
// quad 3
quads[2] = randomPositionBucket{}
quads[2] = RandomPositionBucket{}
for _, p := range quads[0].positions {
quads[2].fill(Point{X: p.X, Y: b.Height - p.Y - 1})
quads[2].Fill(Point{X: p.X, Y: b.Height - p.Y - 1})
}
// quad 4
quads[3] = randomPositionBucket{}
quads[3] = RandomPositionBucket{}
for _, p := range quads[0].positions {
quads[3].fill(Point{X: b.Width - p.X - 1, Y: b.Height - p.Y - 1})
quads[3].Fill(Point{X: b.Width - p.X - 1, Y: b.Height - p.Y - 1})
}
currentQuad := rand.Intn(4) // randomly pick a quadrant to start from
// evenly distribute snakes across quadrants, randomly, by rotating through the quadrants
for i := 0; i < len(b.Snakes); i++ {
p, err := quads[currentQuad].take(rand)
p, err := quads[currentQuad].Take(rand)
if err != nil {
return err
}
@ -235,51 +235,15 @@ func PlaceManySnakesDistributed(rand Rand, b *BoardState, snakeIDs []string) err
return nil
}
func PlaceSnakesInQuadrants(rand Rand, b *BoardState, quadrants [][]Point) error {
if len(quadrants) != 4 {
return RulesetError("invalid start point configuration - not divided into quadrants")
}
// make sure all quadrants have the same number of positions
for i := 1; i < 4; i++ {
if len(quadrants[i]) != len(quadrants[0]) {
return RulesetError("invalid start point configuration - quadrants aren't even")
}
}
quads := make([]randomPositionBucket, 4)
for i := 0; i < 4; i++ {
quads[i].fill(quadrants[i]...)
}
currentQuad := rand.Intn(4) // randomly pick a quadrant to start from
// evenly distribute snakes across quadrants, randomly, by rotating through the quadrants
for i := 0; i < len(b.Snakes); i++ {
p, err := quads[currentQuad].take(rand)
if err != nil {
return err
}
for j := 0; j < SnakeStartSize; j++ {
b.Snakes[i].Body = append(b.Snakes[i].Body, p)
}
currentQuad = (currentQuad + 1) % 4
}
return nil
}
type randomPositionBucket struct {
type RandomPositionBucket struct {
positions []Point
}
func (rpb *randomPositionBucket) fill(p ...Point) {
func (rpb *RandomPositionBucket) Fill(p ...Point) {
rpb.positions = append(rpb.positions, p...)
}
func (rpb *randomPositionBucket) take(rand Rand) (Point, error) {
func (rpb *RandomPositionBucket) Take(rand Rand) (Point, error) {
if len(rpb.positions) == 0 {
return Point{}, RulesetError("no more positions available")
}
@ -359,6 +323,7 @@ func PlaceFoodAutomatically(rand Rand, b *BoardState) error {
return PlaceFoodRandomly(rand, b, len(b.Snakes))
}
// Deprecated: will be replaced by maps.PlaceFoodFixed
func PlaceFoodFixed(rand Rand, b *BoardState) error {
centerCoord := Point{(b.Width - 1) / 2, (b.Height - 1) / 2}