Create game package

example/glut/main.go

@@ -16,11 +16,8 @@ package main
 import "C"
 import (
 	"github.com/hajimehoshi/go.ebiten"
+	"github.com/hajimehoshi/go.ebiten/example/game"
 	"github.com/hajimehoshi/go.ebiten/graphics"
-	"github.com/hajimehoshi/go.ebiten/graphics/matrix"
-	"image"
-	"image/color"
-	_ "image/png"
 	"os"
 	"runtime"
 	"unsafe"
@@ -92,52 +89,12 @@ func (ui *GlutUI) Run(device graphics.Device) {
 	C.glutMainLoop()
 }
 
-type DemoGame struct {
-	ebitenTexture graphics.Texture
-	x             int
-}
-
-func (game *DemoGame) 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)
-}
-
-func (game *DemoGame) Update() {
-	game.x++
-}
-
-func (game *DemoGame) Draw(g graphics.GraphicsContext, offscreen graphics.Texture) {
-	g.Fill(&color.RGBA{R: 128, G: 128, B: 255, A: 255})
-
-	geometryMatrix := matrix.IdentityGeometry()
-	tx, ty := float64(game.ebitenTexture.Width), float64(game.ebitenTexture.Height)
-	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
-	geometryMatrix.Translate(centerX - tx/2, centerY - ty/2)
-	g.DrawTexture(game.ebitenTexture.ID,
-		0, 0, int(tx), int(ty),
-		geometryMatrix,
-		matrix.IdentityColor())
-}
-
 func main() {
 	runtime.GOMAXPROCS(runtime.NumCPU())
 
-	game := &DemoGame{}
+	game := game.NewRotatingImage()
 	currentUI = &GlutUI{}
 	currentUI.Init()
 
 	ebiten.OpenGLRun(game, currentUI)
-
 }