refact

lib/assets.go

@@ -0,0 +1,55 @@
+package lib
+
+import (
+	"bytes"
+	"fmt"
+	"image/png"
+	"io/fs"
+
+	"github.com/hajimehoshi/ebiten/v2"
+	"github.com/hajimehoshi/ebiten/v2/text/v2"
+	"golang.org/x/image/font/gofont/gobold"
+)
+
+type Assets struct {
+	Bg      *ebiten.Image
+	Scooter *ebiten.Image
+	Rabbit  [4]*ebiten.Image
+	HudFont *text.GoTextFace
+}
+
+func LoadAssets(assetsFS fs.FS) (*Assets, error) {
+	src, err := text.NewGoTextFaceSource(bytes.NewReader(gobold.TTF))
+	if err != nil {
+		return nil, fmt.Errorf("load font: %w", err)
+	}
+	a := &Assets{
+		HudFont: &text.GoTextFace{Source: src, Size: 8},
+	}
+	if a.Bg, err = loadImage(assetsFS, "assets/background.png"); err != nil {
+		return nil, err
+	}
+	if a.Scooter, err = loadImage(assetsFS, "assets/scooter.png"); err != nil {
+		return nil, err
+	}
+	for i := range a.Rabbit {
+		name := fmt.Sprintf("assets/rabbit_f%d.png", i)
+		if a.Rabbit[i], err = loadImage(assetsFS, name); err != nil {
+			return nil, err
+		}
+	}
+	return a, nil
+}
+
+func loadImage(assetsFS fs.FS, name string) (*ebiten.Image, error) {
+	f, err := assetsFS.Open(name)
+	if err != nil {
+		return nil, fmt.Errorf("open %s: %w", name, err)
+	}
+	defer f.Close()
+	img, err := png.Decode(f)
+	if err != nil {
+		return nil, fmt.Errorf("decode %s: %w", name, err)
+	}
+	return ebiten.NewImageFromImage(img), nil
+}