Better commenting throughout

internal/hero/hero.go

@@ -8,6 +8,7 @@ import (
 	"github.com/atridad/LilGuy/internal/projectile"
 )
 
+// Hero defaults
 const (
 	defaultRadius       = 24.0
 	defaultSpeed        = 200.0
@@ -36,6 +37,8 @@ const (
 	airFriction    = 0.95
 )
 
+// Input and bounds
+
 type Input struct {
 	Left   bool
 	Right  bool
@@ -64,6 +67,8 @@ const (
 	DirRight
 )
 
+// Hero state
+
 type Hero struct {
 	X      float64
 	Y      float64
@@ -155,6 +160,8 @@ func (h *Hero) Update(input Input, dt float64, bounds Bounds) {
 	h.updateAnimation(dt)
 }
 
+// Movement and physics
+
 func (h *Hero) updateMovement(input Input, dt float64, bounds Bounds) {
 	h.VelocityY += gravity * dt
 	if h.VelocityY > maxFallSpeed {
@@ -236,6 +243,8 @@ func (h *Hero) updateStamina(input Input, dt float64) {
 	}
 }
 
+// Animation
+
 func (h *Hero) updateAnimation(dt float64) {
 	isMoving := h.isMoving
 	key := animationKey{direction: h.direction, state: animIdle}
@@ -275,6 +284,8 @@ func (h *Hero) getVisualState() VisualState {
 	return StateIdle
 }
 
+// Rendering
+
 func (h *Hero) Draw(screen *ebiten.Image) {
 	sprite := h.getCurrentSprite()