Using a temp free online sprite for now to test sprites

internal/hero/sprites.go

@@ -0,0 +1,65 @@
+package hero
+
+import (
+	"image"
+	"image/color"
+	_ "image/gif"
+	"os"
+
+	"github.com/hajimehoshi/ebiten/v2"
+)
+
+var (
+	spriteBack1  *ebiten.Image
+	spriteBack2  *ebiten.Image
+	spriteFront1 *ebiten.Image
+	spriteFront2 *ebiten.Image
+	spriteLeft1  *ebiten.Image
+	spriteLeft2  *ebiten.Image
+	spriteRight1 *ebiten.Image
+	spriteRight2 *ebiten.Image
+)
+
+func init() {
+	spriteBack1 = loadSprite("assets/hero/avt1_bk1.gif")
+	spriteBack2 = loadSprite("assets/hero/avt1_bk2.gif")
+	spriteFront1 = loadSprite("assets/hero/avt1_fr1.gif")
+	spriteFront2 = loadSprite("assets/hero/avt1_fr2.gif")
+	spriteLeft1 = loadSprite("assets/hero/avt1_lf1.gif")
+	spriteLeft2 = loadSprite("assets/hero/avt1_lf2.gif")
+	spriteRight1 = loadSprite("assets/hero/avt1_rt1.gif")
+	spriteRight2 = loadSprite("assets/hero/avt1_rt2.gif")
+}
+
+func loadSprite(path string) *ebiten.Image {
+	file, err := os.Open(path)
+	if err != nil {
+		panic(err)
+	}
+	defer file.Close()
+
+	img, _, err := image.Decode(file)
+	if err != nil {
+		panic(err)
+	}
+
+	bounds := img.Bounds()
+	rgba := image.NewRGBA(bounds)
+	for y := bounds.Min.Y; y < bounds.Max.Y; y++ {
+		for x := bounds.Min.X; x < bounds.Max.X; x++ {
+			r, g, b, a := img.At(x, y).RGBA()
+			if r > 0xf000 && g > 0xf000 && b > 0xf000 {
+				rgba.Set(x, y, color.RGBA{0, 0, 0, 0})
+			} else {
+				rgba.Set(x, y, color.RGBA{
+					R: uint8(r >> 8),
+					G: uint8(g >> 8),
+					B: uint8(b >> 8),
+					A: uint8(a >> 8),
+				})
+			}
+		}
+	}
+
+	return ebiten.NewImageFromImage(rgba)
+}