Initial commit

main.go

@@ -0,0 +1,139 @@
+package main
+
+import (
+	"bytes"
+	"embed"
+	_ "embed"
+	"image"
+	_ "image/png"
+	"io/fs"
+	"log"
+	"math"
+	"math/rand"
+	"path/filepath"
+	"strings"
+	"time"
+
+	"github.com/hajimehoshi/ebiten/v2"
+)
+
+const (
+	width  = 32
+	height = 32
+)
+
+var (
+	mSprite map[string]*ebiten.Image
+
+	//go:embed assets/*
+	f embed.FS
+)
+
+type mascot struct {
+	x      int
+	y      int
+	count  int
+	sprite string
+}
+
+func (m *mascot) Layout(outsideWidth, outsideHeight int) (int, int) {
+	return width, height
+}
+
+func (m *mascot) Update() error {
+	mx, my := ebiten.CursorPosition()
+
+	m.count++
+
+	//sw, sh := ebiten.ScreenSizeInFullscreen()
+	ebiten.SetWindowPosition(m.x, m.y)
+
+	x := mx - (height / 2)
+	y := my - (width / 2)
+
+	r := math.Atan2(float64(y), float64(x))
+	tr := 0.0
+	if r <= 0 {
+		tr = 360
+	}
+	a := (r / math.Pi * 180) + tr
+
+	switch {
+	case a < 292.5 && a > 247.5:
+		m.y--
+		m.sprite = "up"
+	case a < 337.5 && a > 292.5:
+		m.x++
+		m.y--
+		m.sprite = "upright"
+	case a < 22.5 || a > 337.5:
+		m.x++
+		m.sprite = "right"
+	case a < 67.5 && a > 22.5:
+		m.x++
+		m.y++
+		m.sprite = "downright"
+	case a < 112.5 && a > 67.5:
+		m.y++
+		m.sprite = "down"
+	case a < 157.5 && a > 112.5:
+		m.x--
+		m.y++
+		m.sprite = "downleft"
+	case a < 202.5 && a > 157.5:
+		m.x--
+		m.sprite = "left"
+	case a < 247.5 && a > 202.5:
+		m.x--
+		m.y--
+		m.sprite = "upleft"
+	}
+
+	return nil
+}
+
+func (m *mascot) Draw(screen *ebiten.Image) {
+	img := mSprite["up1"]
+	switch {
+	case m.count >= 0 && m.count <= 7:
+		img = mSprite[m.sprite+"1"]
+	case m.count >= 8 && m.count <= 16:
+		img = mSprite[m.sprite+"2"]
+	default:
+		m.count = 0
+	}
+	op := &ebiten.DrawImageOptions{}
+	screen.DrawImage(img, op)
+}
+
+func main() {
+	rand.Seed(time.Now().UnixNano())
+	mSprite = make(map[string]*ebiten.Image)
+
+	a, _ := fs.ReadDir(f, "assets")
+	for _, v := range a {
+		data, _ := f.ReadFile("assets/" + v.Name())
+		img, _, err := image.Decode(bytes.NewReader(data))
+		if err != nil {
+			log.Fatal(err)
+		}
+		name := strings.TrimSuffix(v.Name(), filepath.Ext(v.Name()))
+		mSprite[name] = ebiten.NewImageFromImage(img)
+
+		//fmt.Printf("%q\n", name)
+	}
+
+	sw, sh := ebiten.ScreenSizeInFullscreen()
+	n := &mascot{
+		x: sw / 2,
+		y: sh / 2,
+	}
+
+	ebiten.SetScreenTransparent(true)
+	ebiten.SetWindowDecorated(false)
+	ebiten.SetWindowFloating(true)
+	ebiten.SetWindowSize(width, height)
+	if err := ebiten.RunGame(n); err != nil {
+		log.Fatal(err)
+	}
+}