Initial commit

.gitignore

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+/.*
+!/.gitignore

README.md

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+# Go snake
+
+![Game screenshot](./screenshot.png 'Game screenshot')
+
+## Run game
+
+```
+$ cd cmd/game
+$ go run *go
+```
+
+## Sprites
+
+[DungeonTilesetII](https://0x72.itch.io/dungeontileset-ii)

cmd/game/main.go

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+package main
+
+import (
+	"image"
+	_ "image/png"
+	"log"
+	"math/rand"
+	"time"
+
+	"github.com/hajimehoshi/ebiten"
+	"github.com/hajimehoshi/ebiten/ebitenutil"
+	"github.com/hajimehoshi/ebiten/inpututil"
+)
+
+const (
+	screenWidth  = 240
+	screenHeight = 240
+
+	tileSize = 16
+	tileXNum = 32
+
+	// SpriteBack - sprite for background
+	SpriteBack = 129
+
+	// SpriteSnake - sprite for snake piece
+	SpriteSnake = 126
+)
+
+var (
+	tilesImage       *ebiten.Image
+	snakePosition    [][]int
+	currentDirection = ebiten.KeyRight
+	isFinished       = true
+	pieceToPick      = [2]int{-1, -1}
+)
+
+func init() {
+	var err error
+	tilesImage, _, err = ebitenutil.NewImageFromFile("assets/sprites.png", ebiten.FilterDefault)
+	if err != nil {
+		log.Fatal(err)
+	}
+	rand.Seed(time.Now().UnixNano())
+}
+
+// Game ...
+type Game struct {
+	counter int
+}
+
+// Update state
+func (g *Game) Update(screen *ebiten.Image) error {
+	if isFinished {
+		if inpututil.IsKeyJustPressed(ebiten.KeyR) {
+			initNewGame()
+		} else {
+			return nil
+		}
+	}
+	g.counter++
+	doStep := g.counter%10 == 1
+	if doStep {
+		const xNum = screenWidth / tileSize
+		const yNum = screenHeight / tileSize
+		oldFirstSnakePiece := snakePosition[len(snakePosition)-1]
+		newFirstSnakePiece := []int{oldFirstSnakePiece[0], oldFirstSnakePiece[1]}
+		isFinished = true
+		if currentDirection == ebiten.KeyUp {
+			if newFirstSnakePiece[1] > 0 {
+				newFirstSnakePiece[1]--
+				isFinished = false
+			}
+		} else if currentDirection == ebiten.KeyDown {
+			if newFirstSnakePiece[1] < (yNum - 1) {
+				newFirstSnakePiece[1]++
+				isFinished = false
+			}
+		} else if currentDirection == ebiten.KeyLeft {
+			if newFirstSnakePiece[0] > 0 {
+				newFirstSnakePiece[0]--
+				isFinished = false
+			}
+		} else if currentDirection == ebiten.KeyRight {
+			if newFirstSnakePiece[0] < (xNum - 1) {
+				newFirstSnakePiece[0]++
+				isFinished = false
+			}
+		}
+		if !isFinished {
+			// Check self-crossing
+			for i, piece := range snakePosition {
+				if i == 0 {
+					continue // Skip first item (it is last snake piece and will be deleted anyway)
+				}
+				if piece[0] == newFirstSnakePiece[0] && piece[1] == newFirstSnakePiece[1] {
+					isFinished = true
+					break
+				}
+			}
+		}
+		if isFinished {
+			return nil
+		}
+		startIndex := 1
+		if newFirstSnakePiece[0] == pieceToPick[0] && newFirstSnakePiece[1] == pieceToPick[1] {
+			startIndex = 0
+			pieceToPick = getPieceToPick()
+		}
+		snakePosition = append(snakePosition[startIndex:len(snakePosition)], newFirstSnakePiece)
+	}
+	if inpututil.IsKeyJustPressed(ebiten.KeyUp) && currentDirection != ebiten.KeyDown {
+		currentDirection = ebiten.KeyUp
+	} else if inpututil.IsKeyJustPressed(ebiten.KeyDown) && currentDirection != ebiten.KeyUp {
+		currentDirection = ebiten.KeyDown
+	} else if inpututil.IsKeyJustPressed(ebiten.KeyLeft) && currentDirection != ebiten.KeyRight {
+		currentDirection = ebiten.KeyLeft
+	} else if inpututil.IsKeyJustPressed(ebiten.KeyRight) && currentDirection != ebiten.KeyLeft {
+		currentDirection = ebiten.KeyRight
+	}
+	return nil
+}
+
+func initNewGame() {
+	snakePosition = [][]int{
+		{0, 0},
+		{1, 0},
+		{2, 0},
+		{3, 0},
+		{4, 0},
+	}
+	currentDirection = ebiten.KeyRight
+	pieceToPick = getPieceToPick()
+	isFinished = false
+}
+
+func getPieceToPick() [2]int {
+	const xMax = screenWidth / tileSize
+	const yMax = screenHeight / tileSize
+	var newPieceX, newPieceY int
+	for {
+		newPieceIndex := rand.Intn(xMax * yMax)
+		newPieceX = newPieceIndex % xMax
+		newPieceY = newPieceIndex / xMax
+		isEmptyCell := true
+		for _, piece := range snakePosition {
+			if piece[0] == newPieceX && piece[1] == newPieceY {
+				isEmptyCell = false
+				break
+			}
+		}
+		if isEmptyCell {
+			break
+		}
+	}
+	return [2]int{newPieceX, newPieceY}
+}
+
+// Draw scene
+func (g *Game) Draw(screen *ebiten.Image) {
+	const xNum = screenWidth / tileSize
+	const yNum = screenHeight / tileSize
+	// Draw background
+	sx := (SpriteBack % tileXNum) * tileSize
+	sy := (SpriteBack / tileXNum) * tileSize
+	for x := 0; x < xNum; x++ {
+		for y := 0; y < yNum; y++ {
+			op := &ebiten.DrawImageOptions{}
+			op.GeoM.Translate(float64(x*tileSize), float64(y*tileSize))
+			screen.DrawImage(tilesImage.SubImage(image.Rect(sx, sy, sx+tileSize, sy+tileSize)).(*ebiten.Image), op)
+		}
+	}
+	// Draw snake
+	sx = (SpriteSnake % tileXNum) * tileSize
+	sy = (SpriteSnake / tileXNum) * tileSize
+	for _, p := range snakePosition {
+		op := &ebiten.DrawImageOptions{}
+		op.GeoM.Translate(float64(p[0]*tileSize), float64(p[1]*tileSize))
+		screen.DrawImage(tilesImage.SubImage(image.Rect(sx, sy, sx+tileSize, sy+tileSize)).(*ebiten.Image), op)
+	}
+	// Draw piece to pick
+	if pieceToPick[0] != -1 {
+		sx = (SpriteSnake % tileXNum) * tileSize
+		sy = (SpriteSnake / tileXNum) * tileSize
+		op := &ebiten.DrawImageOptions{}
+		op.GeoM.Translate(float64(pieceToPick[0]*tileSize), float64(pieceToPick[1]*tileSize))
+		screen.DrawImage(tilesImage.SubImage(image.Rect(sx, sy, sx+tileSize, sy+tileSize)).(*ebiten.Image), op)
+	}
+	// Draw finish text
+	if isFinished {
+		ebitenutil.DebugPrint(screen, "You've lost :( Press R to restart")
+	}
+}
+
+// Layout ...
+func (g *Game) Layout(outsideWidth, outsideHeight int) (int, int) {
+	return screenWidth, screenHeight
+}
+
+func main() {
+	g := &Game{}
+	ebiten.SetWindowSize(screenWidth*2, screenHeight*2)
+	ebiten.SetWindowTitle("Go Snake")
+	initNewGame()
+	if err := ebiten.RunGame(g); err != nil {
+		log.Fatal(err)
+	}
+}

go.mod

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+module github.com/kiaplayer/go_snake
+
+go 1.14
+
+require github.com/hajimehoshi/ebiten v1.11.7

go.sum

@@ -0,0 +1,51 @@
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