Improved angle adjustment for the mouse, utilizing only a single switch case.

main.go

@@ -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.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.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.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"
 	}
 }