Starting work on making the game exist on a torus

conway/conway_test.go

@@ -2,6 +2,7 @@ package conway_test
 
 import (
 	"fmt"
+	"math/rand"
 	"strings"
 	"testing"
 )
@@ -180,7 +181,7 @@ func TestNewGameOfLifeHasGameStateOfSameDimensions(t *testing.T) {
 		t.Fail()
 	}
 
-	if len(game.State.Rows[0].Cols) < 16 {
+	if len(game.State.Rows[0].Cells) < 16 {
 		t.Fail()
 	}
 }
@@ -480,3 +481,86 @@ func TestGameOfLifeEmitsGenerationTicksUntilStasis(t *testing.T) {
 		t.Errorf("%v is too few generations!", nGens)
 	}
 }
+
+func TestGameStateRowsCanBeGottenByYCoord(t *testing.T) {
+	state, err := newTestGameState()
+	if err != nil {
+		t.Error(err)
+		return
+	}
+
+	row := state.GetRow(1)
+
+	if len(row.Cells) < 1 {
+		t.Fail()
+	}
+}
+
+func TestGameStateRowsCanBeGottenByYCoordsBeyondBounds(t *testing.T) {
+	state, err := newTestGameState()
+	if err != nil {
+		t.Error(err)
+		return
+	}
+
+	newVal := rand.Intn(9999)
+
+	err = state.Set(0, 2, newVal)
+	if err != nil {
+		t.Error(err)
+		return
+	}
+
+	row := state.GetRow(state.Height() + 2)
+
+	if row.Cells[0] != newVal {
+		t.Errorf("(0, 2) != %d: %d", newVal, row.Cells[0])
+		return
+	}
+}
+
+func TestGameStateRowCellsCanBeGottenByXCoord(t *testing.T) {
+	state, err := newTestGameState()
+	if err != nil {
+		t.Error(err)
+		return
+	}
+
+	newVal := rand.Intn(9999)
+
+	err = state.Set(4, 0, newVal)
+	if err != nil {
+		t.Error(err)
+		return
+	}
+
+	row := state.GetRow(0)
+	cell := row.GetCell(4)
+
+	if cell.Value != newVal {
+		t.Errorf("(0, 4) != %d: %d", newVal, cell.Value)
+	}
+}
+
+func TestGameStateRowCellsCanBeGottenByXCoordBeyondBounds(t *testing.T) {
+	state, err := newTestGameState()
+	if err != nil {
+		t.Error(err)
+		return
+	}
+
+	newVal := rand.Intn(9999)
+
+	err = state.Set(9, 2, newVal)
+	if err != nil {
+		t.Error(err)
+		return
+	}
+
+	row := state.GetRow(2)
+	cell := row.GetCell(state.Width() + 9)
+
+	if cell.Value != newVal {
+		t.Errorf("(9, 2) != %d: %d", newVal, cell.Value)
+	}
+}

conway/game_state.go

@@ -14,20 +14,16 @@ const (
 	LIVE_CELL = " "
 )
 
-type gameGridRow struct {
-	Cols []int
-}
-
 type GameState struct {
-	Rows []*gameGridRow
+	Rows []*GameStateRow
 }
 
 func NewGameState(height, width int) *GameState {
 	state := &GameState{}
 	for i := 0; i < height; i++ {
-		row := &gameGridRow{}
+		row := &GameStateRow{Y: i}
 		for j := 0; j < width; j++ {
-			row.Cols = append(row.Cols, 0)
+			row.Cells = append(row.Cells, 0)
 		}
 		state.Rows = append(state.Rows, row)
 	}
@@ -42,15 +38,17 @@ func (state *GameState) Width() int {
 	if len(state.Rows) < 1 {
 		return -1
 	}
-	return len(state.Rows[0].Cols)
+	return len(state.Rows[0].Cells)
 }
 
-func (state *GameState) GetRow(y int) (*gameGridRow, error) {
+func (state *GameState) GetRow(y int) *GameStateRow {
-	if y+1 > len(state.Rows) {
+	lenRows := len(state.Rows)
-		return nil, errors.New("y coordinate is out of bounds!")
+
+	if y+1 > lenRows {
+		return state.GetRow(y % lenRows)
 	}
 
-	return state.Rows[y], nil
+	return state.Rows[y]
 }
 
 func (state *GameState) Set(x, y, value int) error {
@@ -59,31 +57,25 @@ func (state *GameState) Set(x, y, value int) error {
 		return errors.New(errMsg)
 	}
 
-	row, err := state.GetRow(y)
+	row := state.GetRow(y)
-	if err != nil {
-		return err
-	}
 
-	if x+1 > len(row.Cols) {
+	if x+1 > len(row.Cells) {
 		errMsg := fmt.Sprintf("x coordinate %v is out of bounds!", x)
 		return errors.New(errMsg)
 	}
 
-	row.Cols[x] = value
+	row.Cells[x] = value
 	return nil
 }
 
 func (state *GameState) Get(x, y int) (int, error) {
-	row, err := state.GetRow(y)
+	row := state.GetRow(y)
-	if err != nil {
-		return -1, err
-	}
 
-	if len(row.Cols) < x+1 {
+	if len(row.Cells) < x+1 {
 		return -1, errors.New("x coordinate is out of bounds!")
 	}
 
-	return row.Cols[x], nil
+	return row.Cells[x], nil
 }
 
 func (state *GameState) Enliven(x, y int) error {
@@ -96,7 +88,7 @@ func (state *GameState) Deaden(x, y int) error {
 
 func (state *GameState) Import(other *GameState) (err error) {
 	for y, row := range other.Rows {
-		for x, cell := range row.Cols {
+		for x, cell := range row.Cells {
 			if err = state.Set(x, y, cell); err != nil {
 				return err
 			}
@@ -121,10 +113,7 @@ func (state *GameState) Cells() (<-chan *GameStateCell, error) {
 		width := state.Width()
 
 		for y := 0; y < height; y++ {
-			row, err := state.GetRow(y)
+			row := state.GetRow(y)
-			if err != nil {
-				panic(err)
-			}
 
 			for x := 0; x < width; x++ {
 				value, err := state.Get(x, y)
@@ -135,7 +124,7 @@ func (state *GameState) Cells() (<-chan *GameStateCell, error) {
 					Value:     value,
 					X:         x,
 					Y:         y,
-					cols:  row.Cols,
+					cellmates: row.Cells,
 				}
 			}
 		}

conway/game_state_cell.go

@@ -4,9 +4,9 @@ type GameStateCell struct {
 	Value     int
 	X         int
 	Y         int
-	cols  []int
+	cellmates []int
 }
 
 func (cell *GameStateCell) SetValue(value int) {
-	cell.cols[cell.X] = value
+	cell.cellmates[cell.X] = value
 }

conway/game_state_row.go

@@ -0,0 +1,21 @@
+package conway
+
+type GameStateRow struct {
+	Y     int
+	Cells []int
+}
+
+func (row *GameStateRow) GetCell(x int) *GameStateCell {
+	lenCells := len(row.Cells)
+
+	if x+1 > lenCells {
+		return row.GetCell(x % lenCells)
+	}
+
+	return &GameStateCell{
+		Value:     row.Cells[x],
+		X:         x,
+		Y:         row.Y,
+		cellmates: row.Cells,
+	}
+}

conway/generation_score_card.go

@@ -25,9 +25,9 @@ type neighbor struct {
 func NewGenerationScoreCard(height, width int) *GenerationScoreCard {
 	genScore := &GenerationScoreCard{}
 	for i := 0; i < height; i++ {
-		row := &gameGridRow{}
+		row := &GameStateRow{Y: i}
 		for j := 0; j < width; j++ {
-			row.Cols = append(row.Cols, 0)
+			row.Cells = append(row.Cells, 0)
 		}
 		genScore.Rows = append(genScore.Rows, row)
 	}