Add examples/2048 (#181)

examples/2048/2048/board.go

@@ -0,0 +1,93 @@
+// Copyright 2016 The Ebiten Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package twenty48
+
+import (
+	"fmt"
+	"math/rand"
+
+	"github.com/hajimehoshi/ebiten"
+	"github.com/hajimehoshi/ebiten/ebitenutil"
+)
+
+type Board struct {
+	size  int
+	tiles map[*Tile]struct{}
+}
+
+func NewBoard(size int) *Board {
+	b := &Board{
+		size:  size,
+		tiles: map[*Tile]struct{}{},
+	}
+	for i := 0; i < 2; i++ {
+		b.addRandomTile()
+	}
+	return b
+}
+
+func (b *Board) addRandomTile() bool {
+	cells := make([]bool, b.size*b.size)
+	for t := range b.tiles {
+		i := t.x + t.y*b.size
+		cells[i] = true
+	}
+	availableCells := []int{}
+	for i, b := range cells {
+		if b {
+			continue
+		}
+		availableCells = append(availableCells, i)
+	}
+	if len(availableCells) == 0 {
+		return false
+	}
+	c := availableCells[rand.Intn(len(availableCells))]
+	v := 2
+	if rand.Intn(10) == 0 {
+		v = 4
+	}
+	x := c % b.size
+	y := c / b.size
+	t := NewTile(v, x, y)
+	b.tiles[t] = struct{}{}
+	return true
+}
+
+func (b *Board) Move(dir Dir) {
+	b.addRandomTile()
+}
+
+func (b *Board) Draw(screen *ebiten.Image) error {
+	posToTile := map[int]*Tile{}
+	for t := range b.tiles {
+		i := t.x + t.y*b.size
+		posToTile[i] = t
+	}
+	str := ""
+	for j := 0; j < b.size; j++ {
+		for i := 0; i < b.size; i++ {
+			t := posToTile[i+j*b.size]
+			if t != nil {
+				str += fmt.Sprintf("[%4d]", t.value)
+			} else {
+				str += "[    ]"
+			}
+		}
+		str += "\n"
+	}
+	ebitenutil.DebugPrint(screen, str)
+	return nil
+}

examples/2048/2048/game.go

@@ -0,0 +1,61 @@
+// Copyright 2016 The Ebiten Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package twenty48
+
+import (
+	"math/rand"
+	"time"
+
+	"github.com/hajimehoshi/ebiten"
+)
+
+func init() {
+	rand.Seed(time.Now().UnixNano())
+}
+
+const (
+	ScreenWidth  = 420
+	ScreenHeight = 600
+	boardSize    = 4
+)
+
+type Game struct {
+	input *Input
+	board *Board
+}
+
+func NewGame() *Game {
+	return &Game{
+		input: NewInput(),
+		board: NewBoard(boardSize),
+	}
+}
+
+func (g *Game) Update() error {
+	if err := g.input.Update(); err != nil {
+		return err
+	}
+	if dir, ok := g.input.Dir(); ok {
+		g.board.Move(dir)
+	}
+	return nil
+}
+
+func (g *Game) Draw(screen *ebiten.Image) error {
+	if err := g.board.Draw(screen); err != nil {
+		return err
+	}
+	return nil
+}

examples/2048/2048/input.go

@@ -0,0 +1,81 @@
+// Copyright 2016 The Ebiten Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package twenty48
+
+import (
+	"github.com/hajimehoshi/ebiten"
+)
+
+type Dir int
+
+const (
+	DirUp Dir = iota
+	DirRight
+	DirDown
+	DirLeft
+)
+
+func (d Dir) Vector() (x, y int) {
+	switch d {
+	case DirUp:
+		return 0, -1
+	case DirRight:
+		return 1, 0
+	case DirDown:
+		return 0, 1
+	case DirLeft:
+		return -1, 0
+	}
+	panic("not reach")
+}
+
+type Input struct {
+	keyState map[ebiten.Key]int
+}
+
+func NewInput() *Input {
+	return &Input{
+		keyState: map[ebiten.Key]int{},
+	}
+}
+
+var (
+	dirKeys = map[ebiten.Key]Dir{
+		ebiten.KeyUp:    DirUp,
+		ebiten.KeyRight: DirRight,
+		ebiten.KeyDown:  DirDown,
+		ebiten.KeyLeft:  DirLeft,
+	}
+)
+
+func (i *Input) Update() error {
+	for k := range dirKeys {
+		if ebiten.IsKeyPressed(k) {
+			i.keyState[k]++
+		} else {
+			i.keyState[k] = 0
+		}
+	}
+	return nil
+}
+
+func (i *Input) Dir() (Dir, bool) {
+	for k, d := range dirKeys {
+		if i.keyState[k] == 1 {
+			return d, true
+		}
+	}
+	return 0, false
+}

examples/2048/2048/tile.go

@@ -0,0 +1,29 @@
+// Copyright 2016 The Ebiten Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package twenty48
+
+type Tile struct {
+	value int
+	x     int
+	y     int
+}
+
+func NewTile(value int, x, y int) *Tile {
+	return &Tile{
+		value: value,
+		x:     x,
+		y:     y,
+	}
+}

examples/2048/main.go

@@ -0,0 +1,45 @@
+// Copyright 2016 The Ebiten Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package main
+
+import (
+	"log"
+
+	"github.com/hajimehoshi/ebiten"
+	"github.com/hajimehoshi/ebiten/examples/2048/2048"
+)
+
+var (
+	game = twenty48.NewGame()
+)
+
+func update(screen *ebiten.Image) error {
+	if err := game.Update(); err != nil {
+		return err
+	}
+	if ebiten.IsRunningSlowly() {
+		return nil
+	}
+	if err := game.Draw(screen); err != nil {
+		return err
+	}
+	return nil
+}
+
+func main() {
+	if err := ebiten.Run(update, twenty48.ScreenWidth, twenty48.ScreenHeight, 1, "2048 (Ebiten Demo)"); err != nil {
+		log.Fatal(err)
+	}
+}