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Cells can have their values set when ranging over them

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plus more replacement of y, x loops with cell ranges, adding static
neighbor coords.
This commit is contained in:
Dan Buch 2012-12-11 22:30:34 -05:00
parent 078efbe057
commit 8ba87ccc81
3 changed files with 203 additions and 99 deletions
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70
conway/conway_test.go
View File

@ -377,14 +377,78 @@ func TestStateCanMutate(t *testing.T) {
return
}
curCksum := state.Checksum()
curCksum, err := state.Checksum()
if err != nil {
t.Error(err)
return
}
err = state.Mutate()
if err != nil {
t.Error(err)
return
}
if curCksum == state.Checksum() {
t.Errorf("Checksum did not change! %v", curCksum)
newCksum, err := state.Checksum()
if err != nil {
t.Error(err)
return
}
if curCksum == newCksum {
t.Errorf("Checksum did not change! %v", newCksum)
}
}
func TestStateProvidesCellIteratorChannel(t *testing.T) {
state, err := newTestGameState()
if err != nil {
t.Error(err)
return
}
cells, err := state.Cells()
if err != nil {
t.Error(err)
return
}
cellCount := 0
for _ = range cells {
cellCount++
}
if cellCount != 256 {
t.Fail()
}
}
func TestGameStateCellsCanHaveTheirValueSet(t *testing.T) {
state, err := newTestGameState()
if err != nil {
t.Error(err)
return
}
cells, err := state.Cells()
if err != nil {
t.Error(err)
return
}
for cell := range cells {
cell.SetValue(1)
}
cells, err = state.Cells()
if err != nil {
t.Error(err)
return
}
for cell := range cells {
if cell.Value != 1 {
t.Fail()
}
}
}

13
conway/conways-game-of-life/main.go
View File

@ -40,7 +40,12 @@ func main() {
checksums := make([]string, 4)
checksums[0], checksums[1], checksums[2], checksums[3] = "foo", "bar", "baz", "qwx"
pushChecksum(game.Checksum(), checksums)
ck, err := game.Checksum()
if err != nil {
fmt.Fprintf(os.Stderr, "NAY NAY: %v\n", err)
os.Exit(3)
}
pushChecksum(ck, checksums)
ticks := time.Tick(time.Duration(*sleepMs) * time.Millisecond)
generations := 0
@ -50,7 +55,11 @@ func main() {
game.EvaluateGeneration()
curChecksum := game.Checksum()
curChecksum, err := game.Checksum()
if err != nil {
fmt.Fprintf(os.Stderr, "Failed to calculate current game checksum: %v\n", err)
os.Exit(4)
}
if checksums[0] == curChecksum || checksums[1] == curChecksum {
fmt.Println("Stasis!")

111
conway/game_of_life.go
View File

@ -15,10 +15,28 @@ const (
LIVE_CELL = " "
)
var (
neighbors = []neighbor{
neighbor{-1, -1},
neighbor{-1, 0},
neighbor{-1, 1},
neighbor{0, -1},
neighbor{0, 1},
neighbor{1, -1},
neighbor{1, 0},
neighbor{1, 1},
}
)
func init() {
rand.Seed(time.Now().UTC().UnixNano())
}
type neighbor struct {
X int
Y int
}
type GameOfLife struct {
State *GameState
}
@ -27,6 +45,7 @@ type GameStateCell struct {
Value int
X int
Y int
cols []int
}
type gameGridRow struct {
@ -124,31 +143,43 @@ func (state *GameState) Import(other *GameState) (err error) {
return nil
}
func (state *GameState) Cells(cells chan *GameStateCell) error {
func (state *GameState) Cells() (<-chan *GameStateCell, error) {
height := state.Height()
width := state.Width()
if height < 0 || width < 0 {
return errors.New("state has invalid dimensions!")
return nil, errors.New("state has invalid dimensions!")
}
defer close(cells)
cells := make(chan *GameStateCell)
go func(state *GameState, c chan *GameStateCell) {
defer close(c)
height := state.Height()
width := state.Width()
for y := 0; y < height; y++ {
row, err := state.GetRow(y)
if err != nil {
panic(err)
}
for x := 0; x < width; x++ {
value, err := state.Get(x, y)
if err != nil {
panic(err)
}
cells <- &GameStateCell{
c <- &GameStateCell{
Value: value,
X: x,
Y: y,
cols: row.Cols,
}
}
}
}(state, cells)
return nil
return (<-chan *GameStateCell)(cells), nil
}
func (game *GameOfLife) Mutate() error {
@ -169,20 +200,21 @@ func (state *GameState) Mutate() error {
return nil
}
func (game *GameOfLife) Checksum() string {
func (game *GameOfLife) Checksum() (string, error) {
return game.State.Checksum()
}
func (state *GameState) Checksum() string {
func (state *GameState) Checksum() (string, error) {
ck := sha1.New()
cells := make(chan *GameStateCell)
go state.Cells(cells)
cells, err := state.Cells()
if err != nil {
return "", err
}
for cell := range cells {
fmt.Fprintf(ck, "%v", cell.Value)
}
return fmt.Sprintf("%x", ck.Sum(nil))
return fmt.Sprintf("%x", ck.Sum(nil)), nil
}
func NewGameOfLife(height, width int) *GameOfLife {
@ -197,14 +229,15 @@ func (game *GameOfLife) EvaluateGeneration() error {
genScore := NewGenerationScoreCard(height, width)
genScore.Calculate(game.State)
for y := 0; y < height; y++ {
for x := 0; x < width; x++ {
score, err := genScore.Get(x, y)
cells, err := genScore.Cells()
if err != nil {
return err
}
curState, err := game.State.Get(x, y)
for cell := range cells {
score := cell.Value
curState, err := game.State.Get(cell.X, cell.Y)
if err != nil {
return err
}
@ -212,7 +245,7 @@ func (game *GameOfLife) EvaluateGeneration() error {
if curState == 1 {
if score < 2 {
err = game.State.Deaden(x, y)
err = game.State.Deaden(cell.X, cell.Y)
if err != nil {
return err
}
@ -224,7 +257,7 @@ func (game *GameOfLife) EvaluateGeneration() error {
}
if score > 3 {
err = game.State.Deaden(x, y)
err = game.State.Deaden(cell.X, cell.Y)
if err != nil {
return err
}
@ -233,7 +266,7 @@ func (game *GameOfLife) EvaluateGeneration() error {
} else if curState == 0 {
if score == 3 {
err = game.State.Enliven(x, y)
err = game.State.Enliven(cell.X, cell.Y)
if err != nil {
return err
}
@ -243,7 +276,6 @@ func (game *GameOfLife) EvaluateGeneration() error {
}
}
}
}
return nil
}
@ -264,13 +296,13 @@ func (game *GameOfLife) ImportRandomState() error {
randState := NewGameState(height, width)
for y := 0; y < height; y++ {
for x := 0; x < width; x++ {
err := randState.Set(x, y, rand.Intn(2))
cells, err := randState.Cells()
if err != nil {
return err
}
}
for cell := range cells {
cell.SetValue(rand.Intn(2))
}
return game.ImportState(randState)
@ -280,6 +312,10 @@ func (game *GameOfLife) String() string {
return fmt.Sprintf("%s\n", game.State)
}
func (cell *GameStateCell) SetValue(value int) {
cell.cols[cell.X] = value
}
func (state *GameState) String() string {
var rows []string
@ -319,19 +355,20 @@ func NewGenerationScoreCard(height, width int) *GenerationScoreCard {
}
func (genScore *GenerationScoreCard) Calculate(state *GameState) error {
stateHeight, stateWidth := state.Height(), state.Width()
for y := 0; y < stateHeight; y++ {
for x := 0; x < stateWidth; x++ {
value, err := state.Get(x, y)
stateWidth := state.Width()
stateCells, err := state.Cells()
if err != nil {
return err
}
if value == 1 {
for yOffset := -1; yOffset < 2; yOffset++ {
for xOffset := -1; xOffset < 2; xOffset++ {
xTarget := x + xOffset
yTarget := y + yOffset
for stateCell := range stateCells {
if stateCell.Value == 0 {
continue
}
for _, neighbor := range neighbors {
xTarget := stateCell.X + neighbor.X
yTarget := stateCell.Y + neighbor.Y
if xTarget < 0 || yTarget < 0 {
continue
@ -341,23 +378,17 @@ func (genScore *GenerationScoreCard) Calculate(state *GameState) error {
continue
}
if xTarget == x && yTarget == y {
curScore, err := genScore.Get(xTarget, yTarget)
if err != nil {
continue
}
curScore, err := genScore.Get(xTarget, yTarget)
if err != nil {
continue // assume out of bounds, which is stinky
}
err = genScore.Set(xTarget, yTarget, curScore+1)
if err != nil {
return err
}
}
}
}
}
}
return nil
}