random obstacles as a service

game/game.go

@@ -1,6 +1,9 @@
 package game
 
-import "log"
+import (
+	"log"
+	"math/rand"
+)
 
 func UpdateState(s State, sOld State) State {
 	for i := range s.Teams {
@@ -178,7 +181,28 @@ func NewState() State {
 
 	return State{
 		Teams:     teams,
-		Obstacles: []Obstacle{
+		Obstacles: randomObstacles(),
+	}
+}
+
+func randomObstacles() []Obstacle {
+	var os []Obstacle
+
+	const numObstacles = 4 * NumTeams
+	for i := 0; i < numObstacles; i++ {
+		os = append(os, Obstacle{
+			Position: Position{
+				Pos:  rand.Intn(Steps-8) + 4,
+				Lane: rand.Intn(NumLanes),
+			},
+		})
+	}
+
+	return os
+}
+
+var (
+	staticObstacles = []Obstacle{
 		{
 			Position: Position{
 				Lane: 0,
@@ -203,9 +227,8 @@ func NewState() State {
 				Pos:  Steps * 3 / 4,
 			},
 		},
-		},
-	}
 	}
+)
 
 const (
 	Steps    = 40