keyboard handling

presenter/engine.go

@@ -1,6 +1,11 @@
 package presenter
 
-import "github.com/hajimehoshi/ebiten"
+import (
+	"game/domain"
+	"image/color"
+
+	"github.com/hajimehoshi/ebiten"
+)
 
 const (
 	screenWidth  = 320
@@ -8,15 +13,19 @@ const (
 )
 
 type GameEngine struct {
-	keys []ebiten.Key
+	Context  domain.Context
+	Keyboard Keyboard
 }
 
-func (g *GameEngine) Update(*ebiten.Image) error {
+func (g *GameEngine) Update(screen *ebiten.Image) error {
+	g.Keyboard.Watch()
 	return nil
 }
 
 func (g *GameEngine) Draw(screen *ebiten.Image) {
-
+	if g.Keyboard.UpPressed() {
+		screen.Fill(color.White)
+	}
 }
 
 func (g *GameEngine) Layout(outsideWidth, outsideHeight int) (int, int) {

presenter/keyboard.go

@@ -0,0 +1,82 @@
+package presenter
+
+import (
+	"fmt"
+	"reflect"
+
+	"github.com/hajimehoshi/ebiten"
+	"github.com/hajimehoshi/ebiten/inpututil"
+)
+
+type KeyMap struct {
+	Up      ebiten.Key
+	Down    ebiten.Key
+	Right   ebiten.Key
+	Left    ebiten.Key
+	Action0 ebiten.Key
+	Action1 ebiten.Key
+	Action2 ebiten.Key
+	Action3 ebiten.Key
+}
+
+type Keyboard struct {
+	PressedKey ebiten.Key
+	KeyMap     KeyMap
+}
+
+func CreateDefaultKeyMap() KeyMap {
+	return KeyMap{
+		Up:      ebiten.KeyUp,
+		Down:    ebiten.KeyDown,
+		Right:   ebiten.KeyRight,
+		Left:    ebiten.KeyLeft,
+		Action0: ebiten.KeySpace,
+		Action1: ebiten.KeyAlt,
+		Action2: ebiten.KeyControl,
+		Action3: ebiten.KeyEscape,
+	}
+}
+
+func (k *Keyboard) Watch() {
+	values := reflect.ValueOf(k.KeyMap)
+
+	for i := 0; i < values.NumField(); i++ {
+		key := values.Field(i).Interface().(ebiten.Key)
+		if inpututil.IsKeyJustPressed(key) {
+			fmt.Printf("Key pressed: %s\n", key)
+			k.PressedKey = key
+		}
+	}
+}
+
+func (k *Keyboard) UpPressed() bool {
+	return k.PressedKey == k.KeyMap.Up
+}
+
+func (k *Keyboard) DownPressed() bool {
+	return k.PressedKey == k.KeyMap.Down
+}
+
+func (k *Keyboard) RightPressed() bool {
+	return k.PressedKey == k.KeyMap.Right
+}
+
+func (k *Keyboard) LeftPressed() bool {
+	return k.PressedKey == k.KeyMap.Left
+}
+
+func (k *Keyboard) Action0Pressed() bool {
+	return k.PressedKey == k.KeyMap.Action0
+}
+
+func (k *Keyboard) Action1Pressed() bool {
+	return k.PressedKey == k.KeyMap.Action1
+}
+
+func (k *Keyboard) Action2Pressed() bool {
+	return k.PressedKey == k.KeyMap.Action2
+}
+
+func (k *Keyboard) Action3Pressed() bool {
+	return k.PressedKey == k.KeyMap.Action3
+}

presenter/presenter.go

@@ -14,7 +14,12 @@ type Presenter struct {
 func (p Presenter) Init() {
 	ebiten.SetWindowSize(screenWidth*2, screenHeight*2)
 	ebiten.SetWindowTitle("Game")
-	if err := ebiten.RunGame(&GameEngine{}); err != nil {
+	if err := ebiten.RunGame(&GameEngine{
+		Context: p.Context,
+		Keyboard: Keyboard{
+			KeyMap: CreateDefaultKeyMap(),
+		},
+	}); err != nil {
 		log.Fatal(err)
 	}
 }

presenter/utils.go

@@ -0,0 +1,34 @@
+package presenter
+
+import (
+	"bytes"
+	"fmt"
+	"image"
+	"io/ioutil"
+	"log"
+
+	_ "image/png"
+
+	"github.com/hajimehoshi/ebiten"
+)
+
+func LoadImage(path string) *ebiten.Image {
+
+	file, err := ioutil.ReadFile(path) //read the content of file
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	img, _, err := image.Decode(bytes.NewReader(file))
+	if err != nil {
+		fmt.Println("decode error")
+		log.Fatal(err)
+	}
+
+	out, err := ebiten.NewImageFromImage(img, 0)
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	return out
+}