Add game files

example/game/rotating_image.go

@@ -0,0 +1,53 @@
+package game
+
+import (
+	"github.com/hajimehoshi/go.ebiten/graphics"
+	"github.com/hajimehoshi/go.ebiten/graphics/matrix"
+	"image"
+	"image/color"
+	_ "image/png"
+	"os"
+)
+
+type RotatingImage struct {
+	ebitenTexture graphics.Texture
+	x             int
+}
+
+func NewRotatingImage() *RotatingImage {
+	return &RotatingImage{}
+}
+
+func (game *RotatingImage) 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 *RotatingImage) Update() {
+	game.x++
+}
+
+func (game *RotatingImage) 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())
+}

example/game/sprites.go

@@ -0,0 +1,22 @@
+package game
+
+import (
+	"github.com/hajimehoshi/go.ebiten/graphics"
+)
+
+type Sprites struct {
+	ebitenTexture graphics.Texture
+}
+
+func NewSprites() *Sprites {
+	return &Sprites{}
+}
+
+func (game *Sprites) Init(tf graphics.TextureFactory) {
+}
+
+func (game *Sprites) Update() {
+}
+
+func (game *Sprites) Draw(g graphics.GraphicsContext, offscreen graphics.Texture) {
+}