Add sprites; create spritesheet loader

main.go

@@ -0,0 +1,74 @@
+// main.go
+package main
+
+import (
+	"image"
+	_ "image/png"
+	"os"
+
+	"github.com/faiface/pixel"
+	"github.com/faiface/pixel/pixelgl"
+	"golang.org/x/image/colornames"
+)
+
+func loadSprite(path string) (pixel.Picture, error) {
+	file, err := os.Open(path)
+	if err != nil {
+		return nil, err
+	}
+	defer file.Close()
+	img, _, err := image.Decode(file)
+	if err != nil {
+		return nil, err
+	}
+	return pixel.PictureDataFromImage(img), nil
+}
+
+func createSpriteSheet(SpriteSheetImg pixel.Picture, spriteSizeX, spriteSizeY float64) []pixel.Rect {
+	var frames []pixel.Rect
+
+	for x := SpriteSheetImg.Bounds().Min.X; x < SpriteSheetImg.Bounds().Max.X; x += spriteSizeX {
+		for y := SpriteSheetImg.Bounds().Min.Y; y < SpriteSheetImg.Bounds().Max.Y; y += spriteSizeY {
+			frames = append(frames, pixel.R(x, y, x+256, y+256))
+		}
+	}
+	return frames
+}
+
+func run() {
+
+	cfgMain := pixelgl.WindowConfig{
+		Title:  "AsterCal",
+		Bounds: pixel.R(0, 0, 1024, 768),
+		VSync:  true,
+	}
+
+	win, err := pixelgl.NewWindow(cfgMain)
+	if err != nil {
+		panic(err)
+	}
+
+	spritesheet, err := loadSprite("assets/ship_sprite_sheet.png")
+
+	if err != nil {
+		panic(err)
+	}
+	shipFrames := createSpriteSheet(spritesheet, 256, 256)
+
+	player := pixel.NewSprite(spritesheet, shipFrames[0])
+
+	for !win.Closed() {
+		//dt := time.Since(last).Seconds()
+		//last = time.Now()
+		win.Clear(colornames.Whitesmoke)
+
+		player.Draw(win, pixel.IM.Scaled(pixel.ZV, 0.25).Moved(win.Bounds().Center()))
+
+		win.Update()
+	}
+
+}
+
+func main() {
+	pixelgl.Run(run)
+}