refactoring to systems complete. also added observers for collision checks

grid/grid.go

@@ -6,6 +6,7 @@ import (
 	"log"
 	"openquell/assets"
 	"openquell/components"
+	"openquell/observers"
 
 	"github.com/mlange-42/arche/ecs"
 	"github.com/mlange-42/arche/generic"
@@ -45,14 +46,11 @@ func NewGrid(world *ecs.World,
 		components.Renderable,
 		components.Collectible](world)
 
-	ptmapper := generic.NewMap2[
-		components.Position,
-		components.Particle,
-	](world)
-
 	var pos *components.Position
 	var render *components.Renderable
 
+	playerobserver := observers.GetPlayerObserver(world)
+
 	for point, tile := range mapslice {
 		switch tile.Renderable {
 		case true:
@@ -63,6 +61,8 @@ func NewGrid(world *ecs.World,
 			case tile.Player:
 				entity := playermapper.New()
 				pos, _, render, _ = playermapper.Get(entity)
+				playerobserver.AddEntity(entity)
+
 				fmt.Printf("player start pos: %d,%d\n", point.X*tilesize, point.Y*tilesize)
 			case tile.Collectible:
 				entity := colmapper.New()
@@ -85,12 +85,6 @@ func NewGrid(world *ecs.World,
 		pos.Update(point.X*tilesize, point.Y*tilesize, tilesize)
 	}
 
-	// not part of the grid, but add them as well
-	entity := ptmapper.New()
-	_, particle := ptmapper.Get(entity)
-	particle.Index = assets.Tiles['*'].Particle
-	particle.Particles = assets.Tiles['*'].Particles
-
 	return &Grid{
 		Size:     len(mapslice),
 		Tilesize: tilesize,