throw batons with animation

game/commands.go

@@ -13,7 +13,7 @@ func doCommand(cmd command, s State, teamID int) State {
 	da := 1
 	//da += rand.Intn(3) - 1
 
-	b := activeBot(s.Teams[teamID])
+	b := ActiveBot(s.Teams[teamID])
 	if b == nil {
 		return s
 	}

game/game.go

@@ -5,14 +5,14 @@ import "log"
 func UpdateState(s State, sOld State) State {
 	for i := range s.Teams {
 		s = doCommand(chooseCommand(s, i), s, i)
-		if b := activeBot(s.Teams[i]); b != nil {
+		if b := ActiveBot(s.Teams[i]); b != nil {
 			s = moveBot(s, i, *b)
 		}
 		s = maybePassBaton(s, i)
 	}
 
 	for _, t := range s.Teams {
-		if b := activeBot(t); b != nil && won(*b, s) {
+		if b := ActiveBot(t); b != nil && won(*b, s) {
 			log.Printf("team %d won", t.id)
 			s.GameOver = true
 		}
@@ -23,7 +23,7 @@ func UpdateState(s State, sOld State) State {
 
 func maybePassBaton(s State, teamID int) State {
 	t := s.Teams[teamID]
-	h := activeBot(t)
+	h := ActiveBot(t)
 	if h == nil {
 		return s
 	}
@@ -47,7 +47,7 @@ func maybePassBaton(s State, teamID int) State {
 	return s
 }
 
-func activeBot(t Team) *Bot {
+func ActiveBot(t Team) *Bot {
 	for _, b := range t.Bots {
 		if b.ID == t.Baton.HolderID {
 			return &b

game/physics.go

@@ -52,6 +52,6 @@ func collide(pos, lane int, s State) interface{} {
 }
 
 const (
-	passDistance = 1
+	passDistance = 3
 	baseAccel    = 1
 )

gfx/gfx.go

@@ -17,7 +17,7 @@ type RenderState struct {
 }
 
 func Render(rs RenderState, sOld, sNew game.State, w *pixelgl.Window) RenderState {
-	w.Clear(colornames.Peru)
+	w.Clear(colornames.Olivedrab)
 
 	tween := float64(rs.Frame) / float64(rs.Frames)
 
@@ -51,15 +51,20 @@ func renderBots(sOld, sNew game.State, tween float64, w *pixelgl.Window, colors
 			}
 
 			im.Push(pos)
-
 			im.Clear()
 			im.Circle(botWidth, 0)
-
 			im.Draw(w)
-			if t.Bots[j].ID == t.Baton.HolderID {
-				renderBaton(pos, w)
-			}
 		}
+
+		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)
+
+		pos := pixel.Vec{
+			X: oldPos.X + tween*(newPos.X-oldPos.X),
+			Y: oldPos.Y + tween*(newPos.Y-oldPos.Y),
+		}
+		renderBaton(pos, w)
 	}
 }
 
@@ -110,7 +115,7 @@ func teamColors(ts []game.Team) map[*game.Team]pixel.RGBA {
 		case 2:
 			c = colornames.Lavender
 		case 3:
-			c = colornames.Maroon
+			c = colornames.Rosybrown
 		}
 		m[&ts[i]] = pixel.ToRGBA(c)
 	}