refactor: add Position struct

game/ai.go

@@ -3,8 +3,8 @@ package game
 func chooseCommand(s State, teamID int) command {
 	t := s.Teams[teamID]
 	h := t.BatonHolder()
-	if collide(h.Pos+1, h.Lane, s) != nil {
-		if h.Lane <= t.Lane && h.Lane < NumLanes-1 {
+	if collide(h.Position.Pos+1, h.Position.Lane, s) != nil {
+		if h.Position.Lane <= t.Lane && h.Position.Lane < NumLanes-1 {
 			return left
 		}
 		return right
@@ -19,8 +19,8 @@ func chooseCommand(s State, teamID int) command {
 	}
 
 	if nextBot != nil {
-		if h.Lane != nextBot.Lane {
-			if abs(nextBot.Pos-h.Pos) < h.v {
+		if h.Position.Lane != nextBot.Position.Lane {
+			if abs(nextBot.Position.Pos-h.Position.Pos) < h.v {
 				return slowDown
 			}
 		}

game/commands.go

@@ -26,9 +26,9 @@ func doCommand(cmd command, s State, teamID int) State {
 		b.a -= da
 		*b = accelerate(*b)
 	case left:
-		b.Lane++
+		b.Position.Lane++
 	case right:
-		b.Lane--
+		b.Position.Lane--
 	}
 
 	s = updateBot(s, teamID, *b)

game/game.go

@@ -29,10 +29,10 @@ func maybePassBaton(s State, teamID int) State {
 	}
 
 	for i, b := range t.Bots {
-		if h.ID >= b.ID || h.Lane != b.Lane {
+		if h.ID >= b.ID || h.Position.Lane != b.Position.Lane {
 			continue
 		}
-		if abs(b.Pos-h.Pos) <= passDistance {
+		if abs(b.Position.Pos-h.Position.Pos) <= passDistance {
 			h.v = 0
 			h.a = 0
 			s = updateBot(s, teamID, *h)
@@ -82,7 +82,7 @@ func updateTeam(s State, t Team) State {
 }
 
 func won(b Bot, s State) bool {
-	return b.Pos >= Steps
+	return b.Position.Pos >= Steps
 }
 
 func gameOver(s State) bool {
@@ -125,11 +125,15 @@ func (t Team) BatonHolder() *Bot {
 }
 
 type Bot struct {
-	ID   int
+	ID       int
+	Position Position
+	v        int
+	a        int
+}
+
+type Position struct {
 	Lane int
 	Pos  int
-	v    int
-	a    int
 }
 
 type Baton struct {
@@ -137,8 +141,7 @@ type Baton struct {
 }
 
 type Obstacle struct {
-	Lane int
-	Pos  int
+	Position Position
 }
 
 func NewState() State {
@@ -147,9 +150,11 @@ func NewState() State {
 		var bots []Bot
 		for j := 0; j < numBots; j++ {
 			b := Bot{
-				ID:   i*NumTeams + j,
-				Lane: i,
-				Pos:  j * (Steps / numBots),
+				ID: i*NumTeams + j,
+				Position: Position{
+					Lane: i,
+					Pos:  j * (Steps / numBots),
+				},
 			}
 			bots = append(bots, b)
 		}
@@ -165,20 +170,28 @@ func NewState() State {
 		Teams: teams,
 		Obstacles: []Obstacle{
 			{
-				Lane: 0,
-				Pos:  Steps / 3,
+				Position: Position{
+					Lane: 0,
+					Pos:  Steps / 3,
+				},
 			},
 			{
-				Lane: 1,
-				Pos:  Steps * 2 / 3,
+				Position: Position{
+					Lane: 1,
+					Pos:  Steps * 2 / 3,
+				},
 			},
 			{
-				Lane: 2,
-				Pos:  Steps / 2,
+				Position: Position{
+					Lane: 2,
+					Pos:  Steps / 2,
+				},
 			},
 			{
-				Lane: 3,
-				Pos:  Steps * 3 / 4,
+				Position: Position{
+					Lane: 3,
+					Pos:  Steps * 3 / 4,
+				},
 			},
 		},
 	}

game/physics.go

@@ -23,11 +23,11 @@ func accelerate(b Bot) Bot {
 
 func moveBot(s State, teamID int, b Bot) State {
 	for i := 0; i < b.v; i++ {
-		if o := collide(b.Pos+1, b.Lane, s); o != nil {
+		if o := collide(b.Position.Pos+1, b.Position.Lane, s); o != nil {
 			log.Printf("bot %d crashed into %#v!", b.ID, o)
 			break
 		} else {
-			b.Pos++
+			b.Position.Pos++
 		}
 	}
 
@@ -37,13 +37,13 @@ func moveBot(s State, teamID int, b Bot) State {
 
 func collide(pos, lane int, s State) interface{} {
 	for _, o := range s.Obstacles {
-		if o.Pos == pos && o.Lane == lane {
+		if o.Position.Pos == pos && o.Position.Lane == lane {
 			return o
 		}
 	}
 	for _, t := range s.Teams {
 		for _, b := range t.Bots {
-			if b.Pos == pos && b.Lane == lane {
+			if b.Position.Pos == pos && b.Position.Lane == lane {
 				return b
 			}
 		}

gfx/gfx.go

@@ -42,8 +42,8 @@ func renderBots(sOld, sNew game.State, tween float64, w *pixelgl.Window, colors
 			im.Color = c
 
 			oldBot := sOld.Teams[i].Bots[j]
-			oldPos := lanePos(oldBot.Pos, oldBot.Lane, botWidth, bounds)
-			newPos := lanePos(bot.Pos, bot.Lane, botWidth, bounds)
+			oldPos := lanePos(oldBot.Position.Pos, oldBot.Position.Lane, botWidth, bounds)
+			newPos := lanePos(bot.Position.Pos, bot.Position.Lane, botWidth, bounds)
 
 			pos := pixel.Vec{
 				X: oldPos.X + tween*(newPos.X-oldPos.X),
@@ -57,8 +57,8 @@ func renderBots(sOld, sNew game.State, tween float64, w *pixelgl.Window, colors
 		}
 
 		oldHolder, newHolder := game.ActiveBot(sOld.Teams[i]), game.ActiveBot(sNew.Teams[i])
-		oldPos := lanePos(oldHolder.Pos, oldHolder.Lane, botWidth, bounds)
-		newPos := lanePos(newHolder.Pos, newHolder.Lane, botWidth, bounds)
+		oldPos := lanePos(oldHolder.Position.Pos, oldHolder.Position.Lane, botWidth, bounds)
+		newPos := lanePos(newHolder.Position.Pos, newHolder.Position.Lane, botWidth, bounds)
 
 		pos := pixel.Vec{
 			X: oldPos.X + tween*(newPos.X-oldPos.X),
@@ -92,7 +92,7 @@ func renderObstacles(s game.State, w *pixelgl.Window) {
 	for _, o := range s.Obstacles {
 		im.Color = pixel.RGB(0.1, 0.1, 0.2)
 
-		pos := lanePos(o.Pos, o.Lane, botWidth, b)
+		pos := lanePos(o.Position.Pos, o.Position.Lane, botWidth, b)
 
 		im.Push(pos)