Add game.Sprites

ebiten.go

@@ -7,22 +7,21 @@ import (
 )
 
 type Game interface {
+	ScreenWidth() int
+	ScreenHeight() int
 	Init(tf graphics.TextureFactory)
 	Update()
 	Draw(g graphics.GraphicsContext, offscreen graphics.Texture)
 }
 
 type UI interface {
-	ScreenWidth() int
-	ScreenHeight() int
-	ScreenScale() int
 	Run(device graphics.Device)
 }
 
-func OpenGLRun(game Game, ui UI) {
+func OpenGLRun(game Game, ui UI, screenScale int) {
 	ch := make(chan bool, 1)
 	device := opengl.NewDevice(
-		ui.ScreenWidth(), ui.ScreenHeight(), ui.ScreenScale(),
+		game.ScreenWidth(), game.ScreenHeight(), screenScale,
 		func(g graphics.GraphicsContext, offscreen graphics.Texture) {
 			ticket := <-ch
 			game.Draw(g, offscreen)

example/game/rotating_image.go

@@ -18,6 +18,14 @@ func NewRotatingImage() *RotatingImage {
 	return &RotatingImage{}
 }
 
+func (game *RotatingImage) ScreenWidth() int {
+	return 256
+}
+
+func (game *RotatingImage) ScreenHeight() int {
+	return 240
+}
+
 func (game *RotatingImage) Init(tf graphics.TextureFactory) {
 	file, err := os.Open("ebiten.png")
 	if err != nil {
@@ -44,8 +52,10 @@ func (game *RotatingImage) Draw(g graphics.GraphicsContext, offscreen graphics.T
 	geometryMatrix.Translate(-tx/2, -ty/2)
 	geometryMatrix.Rotate(float64(game.x) / 60)
 	geometryMatrix.Translate(tx/2, ty/2)
-	centerX, centerY := float64(offscreen.Width)/2, float64(offscreen.Height)/2
+	centerX := float64(game.ScreenWidth()) / 2
+	centerY := float64(game.ScreenHeight()) / 2
 	geometryMatrix.Translate(centerX-tx/2, centerY-ty/2)
+
 	g.DrawTexture(game.ebitenTexture.ID,
 		0, 0, int(tx), int(ty),
 		geometryMatrix,

example/game/sprites.go

@@ -2,21 +2,119 @@ package game
 
 import (
 	"github.com/hajimehoshi/go.ebiten/graphics"
+	"github.com/hajimehoshi/go.ebiten/graphics/matrix"
+	"image"
+	"image/color"
+	"math/rand"
+	"os"
+	"time"
 )
 
+type Sprite struct {
+	texture graphics.Texture
+	ch      chan bool
+	x       int
+	y       int
+	vx      int
+	vy      int
+}
+
+func NewSprite(screenWidth, screenHeight int,
+	texture graphics.Texture) *Sprite {
+	maxX := screenWidth - texture.Width
+	maxY := screenHeight - texture.Height
+	sprite := &Sprite{
+		texture: texture,
+		ch:      make(chan bool),
+		x:       rand.Intn(maxX),
+		y:       rand.Intn(maxY),
+		vx:      rand.Intn(2)*2 - 1,
+		vy:      rand.Intn(2)*2 - 1,
+	}
+	go func() {
+		for {
+			<-sprite.ch
+			sprite.x += sprite.vx
+			sprite.y += sprite.vy
+			if sprite.x < 0 || maxX <= sprite.x {
+				sprite.vx = -sprite.vx
+			}
+			if sprite.y < 0 || maxY <= sprite.y {
+				sprite.vy = -sprite.vy
+			}
+			sprite.ch <- true
+		}
+	}()
+	return sprite
+}
+
+func (sprite *Sprite) Update() {
+	sprite.ch <- true
+	<-sprite.ch
+}
+
+func (sprite *Sprite) Draw(g graphics.GraphicsContext) {
+	geometryMatrix := matrix.IdentityGeometry()
+	geometryMatrix.Translate(float64(sprite.x), float64(sprite.y))
+
+	g.DrawTexture(sprite.texture.ID,
+		0, 0, sprite.texture.Width, sprite.texture.Height,
+		geometryMatrix,
+		matrix.IdentityColor())
+}
+
 type Sprites struct {
 	ebitenTexture graphics.Texture
+	sprites       []*Sprite
 }
 
 func NewSprites() *Sprites {
 	return &Sprites{}
 }
 
+func (game *Sprites) ScreenWidth() int {
+	return 256
+}
+
+func (game *Sprites) ScreenHeight() int {
+	return 240
+}
+
 func (game *Sprites) Init(tf graphics.TextureFactory) {
+	file, err := os.Open("ebiten.png")
+	if err != nil {
+		panic(err)
+	}
+	defer file.Close()
+
+	img, _, err := image.Decode(file)
+	if err != nil {
+		panic(err)
+	}
+	game.ebitenTexture = tf.NewTextureFromImage(img)
+	game.sprites = []*Sprite{}
+	for i := 0; i < 200; i++ {
+		sprite := NewSprite(
+			game.ScreenWidth(),
+			game.ScreenHeight(),
+			game.ebitenTexture)
+		game.sprites = append(game.sprites, sprite)
+	}
 }
 
 func (game *Sprites) Update() {
+	for _, sprite := range game.sprites {
+		sprite.Update()
+	}
 }
 
 func (game *Sprites) Draw(g graphics.GraphicsContext, offscreen graphics.Texture) {
+	g.Fill(&color.RGBA{R: 128, G: 128, B: 255, A: 255})
+	for _, sprite := range game.sprites {
+		sprite.Draw(g)
+	}
+}
+
+func init() {
+	rand.Seed(time.Now().UnixNano())
 }

example/glut/main.go

@@ -24,9 +24,6 @@ import (
 )
 
 type GlutUI struct {
-	screenWidth  int
-	screenHeight int
-	screenScale  int
 	device graphics.Device
 }
 
@@ -43,7 +40,7 @@ func idle() {
 	C.glutPostRedisplay()
 }
 
-func (ui *GlutUI) Init() {
+func (ui *GlutUI) Init(screenWidth, screenHeight, screenScale int) {
 	cargs := []*C.char{}
 	for _, arg := range os.Args {
 		cargs = append(cargs, C.CString(arg))
@@ -55,15 +52,11 @@ func (ui *GlutUI) Init() {
 	}()
 	cargc := C.int(len(cargs))
 
-	ui.screenWidth = 256
-	ui.screenHeight = 240
-	ui.screenScale = 2
-
 	C.glutInit(&cargc, &cargs[0])
 	C.glutInitDisplayMode(C.GLUT_RGBA)
 	C.glutInitWindowSize(
-		C.int(ui.screenWidth*ui.screenScale),
-		C.int(ui.screenHeight*ui.screenScale))
+		C.int(screenWidth*screenScale),
+		C.int(screenHeight*screenScale))
 
 	title := C.CString("Ebiten Demo")
 	defer C.free(unsafe.Pointer(title))
@@ -72,18 +65,6 @@ func (ui *GlutUI) Init() {
 	C.setGlutFuncs()
 }
 
-func (ui *GlutUI) ScreenWidth() int {
-	return ui.screenWidth
-}
-
-func (ui *GlutUI) ScreenHeight() int {
-	return ui.screenHeight
-}
-
-func (ui *GlutUI) ScreenScale() int {
-	return ui.screenScale
-}
-
 func (ui *GlutUI) Run(device graphics.Device) {
 	ui.device = device
 	C.glutMainLoop()
@@ -104,8 +85,10 @@ func main() {
 	default:
 		gm = game.NewRotatingImage()
 	}
-	currentUI = &GlutUI{}
-	currentUI.Init()
 
-	ebiten.OpenGLRun(gm, currentUI)
+	screenScale := 2
+	currentUI = &GlutUI{}
+	currentUI.Init(gm.ScreenWidth(), gm.ScreenHeight(), screenScale)
+
+	ebiten.OpenGLRun(gm, currentUI, screenScale)
 }