Refactor

terrain/terrain.go

@@ -0,0 +1,39 @@
+package terrain
+
+import (
+	"bytes"
+	"github.com/hajimehoshi/ebiten/v2"
+	"gitlab.com/kbr4/9heroja/resources"
+	"image"
+	"log"
+)
+
+var (
+	grassImage *ebiten.Image
+)
+
+type Terrain struct {
+}
+
+func (t *Terrain) DrawTerrain(screen *ebiten.Image) {
+	screenWidth := screen.Bounds().Max.X
+	screenHeight := screen.Bounds().Max.Y
+	op := &ebiten.DrawImageOptions{}
+	for i := 0; i <= screenWidth/64; i++ {
+		for j := 0; j <= screenHeight/64; j++ {
+			// ground
+			op.GeoM.Reset()
+			op.GeoM.Translate(float64(i*64), float64(j*64))
+			screen.DrawImage(grassImage.SubImage(image.Rect(32, 160, 32+64, 160+64)).(*ebiten.Image), op)
+		}
+
+	}
+}
+
+func init() {
+	img, _, err := image.Decode(bytes.NewReader(resources.Grass_png))
+	if err != nil {
+		log.Fatal(err)
+	}
+	grassImage = ebiten.NewImageFromImage(img)
+}