first version with rat

fix: implement sqrt(2) on diagonals

Sorry for the delay in reviewing the PR, I didn't see it was open.

.gitignore

@@ -19,3 +19,4 @@
 
 dist/
 notes.md
+release.sh

go.mod

@@ -1,22 +1,22 @@
 module neko
 
-go 1.24
+go 1.25
 
 require (
 	crg.eti.br/go/config v1.5.0
-	github.com/hajimehoshi/ebiten/v2 v2.8.7
+	github.com/hajimehoshi/ebiten/v2 v2.8.9
 )
 
 require (
 	github.com/davecgh/go-spew v1.1.1 // indirect
-	github.com/ebitengine/gomobile v0.0.0-20250329061421-6d0a8e981e4c // indirect
+	github.com/ebitengine/gomobile v0.0.0-20250923094054-ea854a63cce1 // indirect
 	github.com/ebitengine/hideconsole v1.0.0 // indirect
-	github.com/ebitengine/oto/v3 v3.3.3 // indirect
-	github.com/ebitengine/purego v0.8.2 // indirect
+	github.com/ebitengine/oto/v3 v3.4.0 // indirect
+	github.com/ebitengine/purego v0.9.0 // indirect
 	github.com/jezek/xgb v1.1.1 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
-	golang.org/x/sync v0.12.0 // indirect
-	golang.org/x/sys v0.31.0 // indirect
+	golang.org/x/sync v0.17.0 // indirect
+	golang.org/x/sys v0.36.0 // indirect
 	gopkg.in/ini.v1 v1.67.0 // indirect
 	gopkg.in/yaml.v3 v3.0.1 // indirect
 )

go.sum

@@ -2,78 +2,28 @@ crg.eti.br/go/config v1.5.0 h1:UiHy9zAhFj5LxKPm7TwgVMc7VBxtYWpFcGtXKQHCyf0=
 crg.eti.br/go/config v1.5.0/go.mod h1:Wk/f8SMC4nwlUJu0gRqUA6IOCJ/vMDMlaOvKaF6KqKI=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
-github.com/ebitengine/gomobile v0.0.0-20240911013058-19d2b8b92254 h1:4gZw/SDMJtxpPh+lMpXLZ63LWWna0mZgtEBuvizRmdo=
-github.com/ebitengine/gomobile v0.0.0-20240911013058-19d2b8b92254/go.mod h1:n2NbB/F4d9wOXFzC7FT1ipERidmYWC5I4YNOYRs5N7I=
-github.com/ebitengine/gomobile v0.0.0-20240911145611-4856209ac325 h1:Gk1XUEttOk0/hb6Tq3WkmutWa0ZLhNn/6fc6XZpM7tM=
-github.com/ebitengine/gomobile v0.0.0-20240911145611-4856209ac325/go.mod h1:ulhSQcbPioQrallSuIzF8l1NKQoD7xmMZc5NxzibUMY=
-github.com/ebitengine/gomobile v0.0.0-20241001034212-22433622d8a5 h1:vAmkJvgX1ukQ772M7yxWCmSfDwr8vLAZTWlJqM1ox4A=
-github.com/ebitengine/gomobile v0.0.0-20241001034212-22433622d8a5/go.mod h1:ulhSQcbPioQrallSuIzF8l1NKQoD7xmMZc5NxzibUMY=
-github.com/ebitengine/gomobile v0.0.0-20241016134836-cc2e38a7c0ee h1:YoNt0DHeZ92kjR78SfyUn1yEf7KnBypOFlFZO14cJ6w=
-github.com/ebitengine/gomobile v0.0.0-20241016134836-cc2e38a7c0ee/go.mod h1:ZDIonJlTRW7gahIn5dEXZtN4cM8Qwtlduob8cOCflmg=
-github.com/ebitengine/gomobile v0.0.0-20250209143333-6071a2a2351c h1:nCxkoQoJMcVLc5aoMp3ULbfyEMcQjxopBKgNQVBQFXE=
-github.com/ebitengine/gomobile v0.0.0-20250209143333-6071a2a2351c/go.mod h1:yMh1VvLL71zDgHlVlIXXJIGmv36QcJ9ZD2gtIGYAp3I=
-github.com/ebitengine/gomobile v0.0.0-20250329061421-6d0a8e981e4c h1:Ccgks2VROTr6bIm1FFxG2jT6P1DaCBMj8g/O9xbOQ08=
-github.com/ebitengine/gomobile v0.0.0-20250329061421-6d0a8e981e4c/go.mod h1:M6DDA2RbegvWBVv4Dq482lwyFTtMczT1A7UNm1qOYzY=
+github.com/ebitengine/gomobile v0.0.0-20250923094054-ea854a63cce1 h1:+kz5iTT3L7uU+VhlMfTb8hHcxLO3TlaELlX8wa4XjA0=
+github.com/ebitengine/gomobile v0.0.0-20250923094054-ea854a63cce1/go.mod h1:lKJoeixeJwnFmYsBny4vvCJGVFc3aYDalhuDsfZzWHI=
 github.com/ebitengine/hideconsole v1.0.0 h1:5J4U0kXF+pv/DhiXt5/lTz0eO5ogJ1iXb8Yj1yReDqE=
 github.com/ebitengine/hideconsole v1.0.0/go.mod h1:hTTBTvVYWKBuxPr7peweneWdkUwEuHuB3C1R/ielR1A=
-github.com/ebitengine/oto/v3 v3.2.0 h1:FuggTJTSI3/3hEYwZEIN0CZVXYT29ZOdCu+z/f4QjTw=
-github.com/ebitengine/oto/v3 v3.2.0/go.mod h1:dOKXShvy1EQbIXhXPFcKLargdnFqH0RjptecvyAxhyw=
-github.com/ebitengine/oto/v3 v3.3.0 h1:34lJpJLqda0Iee9g9p8RWtVVwBcOOO2YSIS2x4yD1OQ=
-github.com/ebitengine/oto/v3 v3.3.0/go.mod h1:MZeb/lwoC4DCOdiTIxYezrURTw7EvK/yF863+tmBI+U=
-github.com/ebitengine/oto/v3 v3.3.1 h1:d4McwGQuXOT0GL7bA5g9ZnaUEIEjQvG3hafzMy+T3qE=
-github.com/ebitengine/oto/v3 v3.3.1/go.mod h1:MZeb/lwoC4DCOdiTIxYezrURTw7EvK/yF863+tmBI+U=
-github.com/ebitengine/oto/v3 v3.3.2 h1:VTWBsKX9eb+dXzaF4jEwQbs4yWIdXukJ0K40KgkpYlg=
-github.com/ebitengine/oto/v3 v3.3.2/go.mod h1:MZeb/lwoC4DCOdiTIxYezrURTw7EvK/yF863+tmBI+U=
-github.com/ebitengine/oto/v3 v3.3.3 h1:m6RV69OqoXYSWCDsHXN9rc07aDuDstGHtait7HXSM7g=
-github.com/ebitengine/oto/v3 v3.3.3/go.mod h1:MZeb/lwoC4DCOdiTIxYezrURTw7EvK/yF863+tmBI+U=
-github.com/ebitengine/purego v0.7.1 h1:6/55d26lG3o9VCZX8lping+bZcmShseiqlh2bnUDiPA=
-github.com/ebitengine/purego v0.7.1/go.mod h1:ah1In8AOtksoNK6yk5z1HTJeUkC1Ez4Wk2idgGslMwQ=
-github.com/ebitengine/purego v0.8.0 h1:JbqvnEzRvPpxhCJzJJ2y0RbiZ8nyjccVUrSM3q+GvvE=
-github.com/ebitengine/purego v0.8.0/go.mod h1:iIjxzd6CiRiOG0UyXP+V1+jWqUXVjPKLAI0mRfJZTmQ=
-github.com/ebitengine/purego v0.8.1 h1:sdRKd6plj7KYW33EH5As6YKfe8m9zbN9JMrOjNVF/BE=
-github.com/ebitengine/purego v0.8.1/go.mod h1:iIjxzd6CiRiOG0UyXP+V1+jWqUXVjPKLAI0mRfJZTmQ=
-github.com/ebitengine/purego v0.8.2 h1:jPPGWs2sZ1UgOSgD2bClL0MJIqu58nOmIcBuXr62z1I=
-github.com/ebitengine/purego v0.8.2/go.mod h1:iIjxzd6CiRiOG0UyXP+V1+jWqUXVjPKLAI0mRfJZTmQ=
-github.com/hajimehoshi/ebiten/v2 v2.7.9 h1:DYH/usAa9dMHcGkBIIEApJsVqDekrJBxYHmsBuly8Iw=
-github.com/hajimehoshi/ebiten/v2 v2.7.9/go.mod h1:Ulbq5xDmdx47P24EJ+Mb31Zps7vQq+guieG9mghQUaA=
-github.com/hajimehoshi/ebiten/v2 v2.7.10 h1:fsVukQdPDUlalSSpFkuszTy0cK2DL0fxFoSnTVdlmAM=
-github.com/hajimehoshi/ebiten/v2 v2.7.10/go.mod h1:Ulbq5xDmdx47P24EJ+Mb31Zps7vQq+guieG9mghQUaA=
-github.com/hajimehoshi/ebiten/v2 v2.8.0 h1:CZF2PAksTG7vee9mu1Ok9QHqPyic0rTmIQvepYjs66A=
-github.com/hajimehoshi/ebiten/v2 v2.8.0/go.mod h1:32c6GXjzxA/h2CLLNMjWv5dVSNkTnn7NASZm0nXC/rA=
-github.com/hajimehoshi/ebiten/v2 v2.8.1 h1:6n6ZXnbeSCZccdqrH7s9Ut+dll9TEostUqbc72Tis/g=
-github.com/hajimehoshi/ebiten/v2 v2.8.1/go.mod h1:SXx/whkvpfsavGo6lvZykprerakl+8Uo1X8d2U5aAnA=
-github.com/hajimehoshi/ebiten/v2 v2.8.6 h1:Dkd/sYI0TYyZRCE7GVxV59XC+WCi2BbGAbIBjXeVC1U=
-github.com/hajimehoshi/ebiten/v2 v2.8.6/go.mod h1:cCQ3np7rdmaJa1ZnvslraVlpxNb3wCjEnAP1LHNyXNA=
-github.com/hajimehoshi/ebiten/v2 v2.8.7 h1:DnvNZuB8RF0ffOUTuqaXHl9d51VAT9XYfEMQPYD37v4=
-github.com/hajimehoshi/ebiten/v2 v2.8.7/go.mod h1:durJ05+OYnio9b8q0sEtOgaNeBEQG7Yr7lRviAciYbs=
+github.com/ebitengine/oto/v3 v3.4.0 h1:br0PgASsEWaoWn38b2Goe7m1GKFYfNgnsjSd5Gg+/bQ=
+github.com/ebitengine/oto/v3 v3.4.0/go.mod h1:IOleLVD0m+CMak3mRVwsYY8vTctQgOM0iiL6S7Ar7eI=
+github.com/ebitengine/purego v0.9.0 h1:mh0zpKBIXDceC63hpvPuGLiJ8ZAa3DfrFTudmfi8A4k=
+github.com/ebitengine/purego v0.9.0/go.mod h1:iIjxzd6CiRiOG0UyXP+V1+jWqUXVjPKLAI0mRfJZTmQ=
+github.com/hajimehoshi/ebiten/v2 v2.8.9 h1:qUkI++Dq5Jzcwio5vOIZj6kAkzvei9S3X9zrUJIKJDA=
+github.com/hajimehoshi/ebiten/v2 v2.8.9/go.mod h1:2W03LiNMJj7+mFtYbnZlSLoxovd2bpg4FzQR0pZhzAA=
 github.com/jezek/xgb v1.1.1 h1:bE/r8ZZtSv7l9gk6nU0mYx51aXrvnyb44892TwSaqS4=
 github.com/jezek/xgb v1.1.1/go.mod h1:nrhwO0FX/enq75I7Y7G8iN1ubpSGZEiA3v9e9GyRFlk=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/stretchr/testify v1.8.1 h1:w7B6lhMri9wdJUVmEZPGGhZzrYTPvgJArz7wNPgYKsk=
 github.com/stretchr/testify v1.8.1/go.mod h1:w2LPCIKwWwSfY2zedu0+kehJoqGctiVI29o6fzry7u4=
-golang.org/x/image v0.19.0 h1:D9FX4QWkLfkeqaC62SonffIIuYdOk/UE2XKUBgRIBIQ=
-golang.org/x/image v0.19.0/go.mod h1:y0zrRqlQRWQ5PXaYCOMLTW2fpsxZ8Qh9I/ohnInJEys=
-golang.org/x/sync v0.8.0 h1:3NFvSEYkUoMifnESzZl15y791HH1qU2xm6eCJU5ZPXQ=
-golang.org/x/sync v0.8.0/go.mod h1:Czt+wKu1gCyEFDUtn0jG5QVvpJ6rzVqr5aXyt9drQfk=
-golang.org/x/sync v0.10.0 h1:3NQrjDixjgGwUOCaF8w2+VYHv0Ve/vGYSbdkTa98gmQ=
-golang.org/x/sync v0.10.0/go.mod h1:Czt+wKu1gCyEFDUtn0jG5QVvpJ6rzVqr5aXyt9drQfk=
-golang.org/x/sync v0.11.0 h1:GGz8+XQP4FvTTrjZPzNKTMFtSXH80RAzG+5ghFPgK9w=
-golang.org/x/sync v0.11.0/go.mod h1:Czt+wKu1gCyEFDUtn0jG5QVvpJ6rzVqr5aXyt9drQfk=
-golang.org/x/sync v0.12.0 h1:MHc5BpPuC30uJk597Ri8TV3CNZcTLu6B6z4lJy+g6Jw=
-golang.org/x/sync v0.12.0/go.mod h1:1dzgHSNfp02xaA81J2MS99Qcpr2w7fw1gpm99rleRqA=
-golang.org/x/sys v0.25.0 h1:r+8e+loiHxRqhXVl6ML1nO3l1+oFoWbnlu2Ehimmi34=
-golang.org/x/sys v0.25.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
-golang.org/x/sys v0.26.0 h1:KHjCJyddX0LoSTb3J+vWpupP9p0oznkqVk/IfjymZbo=
-golang.org/x/sys v0.26.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
-golang.org/x/sys v0.28.0 h1:Fksou7UEQUWlKvIdsqzJmUmCX3cZuD2+P3XyyzwMhlA=
-golang.org/x/sys v0.28.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
-golang.org/x/sys v0.29.0 h1:TPYlXGxvx1MGTn2GiZDhnjPA9wZzZeGKHHmKhHYvgaU=
-golang.org/x/sys v0.29.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
-golang.org/x/sys v0.30.0 h1:QjkSwP/36a20jFYWkSue1YwXzLmsV5Gfq7Eiy72C1uc=
-golang.org/x/sys v0.30.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
-golang.org/x/sys v0.31.0 h1:ioabZlmFYtWhL+TRYpcnNlLwhyxaM9kWTDEmfnprqik=
-golang.org/x/sys v0.31.0/go.mod h1:BJP2sWEmIv4KK5OTEluFJCKSidICx8ciO85XgH3Ak8k=
+golang.org/x/image v0.31.0 h1:mLChjE2MV6g1S7oqbXC0/UcKijjm5fnJLUYKIYrLESA=
+golang.org/x/image v0.31.0/go.mod h1:R9ec5Lcp96v9FTF+ajwaH3uGxPH4fKfHHAVbUILxghA=
+golang.org/x/sync v0.17.0 h1:l60nONMj9l5drqw6jlhIELNv9I0A4OFgRsG9k2oT9Ug=
+golang.org/x/sync v0.17.0/go.mod h1:9KTHXmSnoGruLpwFjVSX0lNNA75CykiMECbovNTZqGI=
+golang.org/x/sys v0.36.0 h1:KVRy2GtZBrk1cBYA7MKu5bEZFxQk4NIDV6RLVcC8o0k=
+golang.org/x/sys v0.36.0/go.mod h1:OgkHotnGiDImocRcuBABYBEXf8A9a87e/uXjp9XT3ks=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/ini.v1 v1.67.0 h1:Dgnx+6+nfE+IfzjUEISNeydPJh9AXNNsWbGP9KzCsOA=
 gopkg.in/ini.v1 v1.67.0/go.mod h1:pNLf8WUiyNEtQjuu5G5vTm06TEv9tsIgeAvK8hOrP4k=

main.go

@@ -24,8 +24,8 @@ import (
 
 type neko struct {
 	waiting    bool
-	x          int
-	y          int
+	x          float64
+	y          float64
 	distance   int
 	count      int
 	min        int
@@ -37,7 +37,7 @@ type neko struct {
 }
 
 type Config struct {
-	Speed            int     `cfg:"speed" cfgDefault:"2" cfgHelper:"The speed of the cat."`
+	Speed            float64 `cfg:"speed" cfgDefault:"2.0" cfgHelper:"The speed of the cat."`
 	Scale            float64 `cfg:"scale" cfgDefault:"2.0" cfgHelper:"The scale of the cat."`
 	Quiet            bool    `cfg:"quiet" cfgDefault:"false" cfgHelper:"Disable sound."`
 	MousePassthrough bool    `cfg:"mousepassthrough" cfgDefault:"false" cfgHelper:"Enable mouse passthrough."`
@@ -86,9 +86,9 @@ func (m *neko) Update() error {
 	}
 	// Prevents neko from being stuck on the side of the screen
 	// or randomly travelling to another monitor
-	m.x = max(0, min(m.x, monitorWidth))
-	m.y = max(0, min(m.y, monitorHeight))
-	ebiten.SetWindowPosition(m.x, m.y)
+	m.x = max(0, min(m.x, float64(monitorWidth)))
+	m.y = max(0, min(m.y, float64(monitorHeight)))
+	ebiten.SetWindowPosition(int(math.Round(m.x)), int(math.Round(m.y)))
 
 	mx, my := ebiten.CursorPosition()
 	x := mx - (height / 2)
@@ -148,54 +148,39 @@ func (m *neko) catchCursor(x, y int) {
 	m.state = 0
 	m.min = 8
 	m.max = 16
-	tr := 0.0
+
 	// get mouse direction
 	r := math.Atan2(float64(y), float64(x))
-	if r <= 0 {
-		tr = 360
-	}
-
-	a := (r / math.Pi * 180) + tr
+	a := math.Mod((r/math.Pi*180)+360, 360) // Normazing angle to [0, 360)
 
 	switch {
 	case a <= 292.5 && a > 247.5: // up
 		m.y -= cfg.Speed
+		m.sprite = "up"
 	case a <= 337.5 && a > 292.5: // up right
-		m.x += cfg.Speed
-		m.y -= cfg.Speed
+		m.x += cfg.Speed / math.Sqrt2
+		m.y -= cfg.Speed / math.Sqrt2
+		m.sprite = "upright"
 	case a <= 22.5 || a > 337.5: // right
 		m.x += cfg.Speed
+		m.sprite = "right"
 	case a <= 67.5 && a > 22.5: // down right
-		m.x += cfg.Speed
-		m.y += cfg.Speed
+		m.x += cfg.Speed / math.Sqrt2
+		m.y += cfg.Speed / math.Sqrt2
+		m.sprite = "downright"
 	case a <= 112.5 && a > 67.5: // down
 		m.y += cfg.Speed
+		m.sprite = "down"
 	case a <= 157.5 && a > 112.5: // down left
-		m.x -= cfg.Speed
-		m.y += cfg.Speed
+		m.x -= cfg.Speed / math.Sqrt2
+		m.y += cfg.Speed / math.Sqrt2
+		m.sprite = "downleft"
 	case a <= 202.5 && a > 157.5: // left
 		m.x -= cfg.Speed
+		m.sprite = "left"
 	case a <= 247.5 && a > 202.5: // up left
 		m.x -= cfg.Speed
 		m.y -= cfg.Speed
-	}
-
-	switch {
-	case a < 292 && a > 247:
-		m.sprite = "up"
-	case a < 337 && a > 292:
-		m.sprite = "upright"
-	case a < 22 || a > 337:
-		m.sprite = "right"
-	case a < 67 && a > 22:
-		m.sprite = "downright"
-	case a < 112 && a > 67:
-		m.sprite = "down"
-	case a < 157 && a > 112:
-		m.sprite = "downleft"
-	case a < 202 && a > 157:
-		m.sprite = "left"
-	case a < 247 && a > 202:
 		m.sprite = "upleft"
 	}
 }
@@ -280,8 +265,8 @@ func main() {
 	audio.CurrentContext().NewPlayerFromBytes([]byte{}).Play()
 
 	n := &neko{
-		x:   monitorWidth / 2,
-		y:   monitorHeight / 2,
+		x:   float64(monitorWidth / 2),
+		y:   float64(monitorHeight / 2),
 		min: 8,
 		max: 16,
 	}