added hud system, turned all observers into one central observer

grid/grid.go

@@ -71,8 +71,10 @@ func NewGrid(world *ecs.World,
 	var player *components.Player
 	var destroyable *components.Destroyable
 
-	playerobserver := observers.GetPlayerObserver(world)
-	obstacleobserver := observers.GetObstacleObserver(world)
+	playerID := ecs.ComponentID[components.Player](world)
+	obstacleID := ecs.ComponentID[components.Obstacle](world)
+
+	observer := observers.GetGameObserver(world)
 
 	for point, tile := range mapslice {
 		switch tile.Renderable {
@@ -84,7 +86,7 @@ func NewGrid(world *ecs.World,
 			case tile.Player:
 				entity := playermapper.New()
 				pos, vel, render, player = playermapper.Get(entity)
-				playerobserver.AddEntity(entity)
+				observer.AddEntity(entity, playerID)
 				vel.Speed = config.PLAYERSPEED
 				player.IsPrimary = tile.IsPrimary
 				player.Sprites = tile.Tiles
@@ -97,7 +99,7 @@ func NewGrid(world *ecs.World,
 				vel.Direction = tile.Direction
 				vel.PointingAt = tile.Direction
 				vel.Speed = config.PLAYERSPEED
-				obstacleobserver.AddEntity(entity)
+				observer.AddEntity(entity, obstacleID)
 			case tile.Transient:
 				entity := transmapper.New()
 				pos, render, transient = transmapper.Get(entity)