added manager, scene, and first examples

examples/splashmenu/splash.go

@@ -0,0 +1,69 @@
+package splashmenu
+
+import (
+	"image/color"
+	"log"
+
+	"github.com/hajimehoshi/ebiten/v2"
+	"github.com/hajimehoshi/ebiten/v2/examples/resources/fonts"
+	"github.com/hajimehoshi/ebiten/v2/text"
+	"golang.org/x/image/font"
+	"golang.org/x/image/font/opentype"
+)
+
+var (
+	splashFont font.Face
+)
+
+func init() {
+	tt, err := opentype.Parse(fonts.PressStart2P_ttf)
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	const dpi = 72
+	splashFont, err = opentype.NewFace(tt, &opentype.FaceOptions{
+		Size:    12,
+		DPI:     dpi,
+		Hinting: font.HintingVertical,
+	})
+	if err != nil {
+		log.Fatal(err)
+	}
+}
+
+type Splash struct {
+	bgcolor   color.RGBA
+	completed bool
+	increment int
+}
+
+func NewSplash() Splash {
+	return Splash{
+		bgcolor:   color.RGBA{0xFF, 0xFF, 0xFF, 0xFF},
+		completed: false,
+	}
+}
+
+func (s *Splash) Draw(screen *ebiten.Image) {
+	screen.Fill(s.bgcolor)
+	text.Draw(screen, "splash", splashFont, 40, 40, color.White)
+}
+
+func (s *Splash) Update() error {
+	s.increment++
+
+	s.bgcolor.R = (s.bgcolor.R - 2) % 0xFF
+	s.bgcolor.G = (s.bgcolor.G - 2) % 0xFF
+	s.bgcolor.B = (s.bgcolor.B - 2) % 0xFF
+
+	if s.bgcolor.R == 0x00 {
+		s.completed = true
+	}
+
+	return nil
+}
+
+func (s *Splash) Completed() bool {
+	return s.completed
+}