changes:

- exchanged switch+door sprites
- added asesprite cheat sheet
- implemented door toggle on switch toggle

systems/pair_system.go

@@ -0,0 +1,117 @@
+package systems
+
+import (
+	"openquell/components"
+	. "openquell/components"
+	. "openquell/config"
+	"openquell/grid"
+	"openquell/observers"
+
+	"github.com/hajimehoshi/ebiten/v2"
+	"github.com/mlange-42/arche/ecs"
+	"github.com/mlange-42/arche/generic"
+)
+
+type PairSystem struct {
+	World          *ecs.World
+	DoorSelector   *generic.Filter4[Position, Renderable, Bond, Door]
+	SwitchSelector *generic.Filter4[Position, Renderable, Bond, Switch]
+	GridContainer  *grid.GridContainer
+	DoorMapper     generic.Map4[
+		components.Position,
+		components.Renderable,
+		components.Bond,
+		components.Door]
+}
+
+type ToggleDoor struct {
+	Entity ecs.Entity
+	Open   bool
+}
+
+func NewPairSystem(world *ecs.World, gridcontainer *grid.GridContainer) System {
+	doormapper := generic.NewMap4[
+		components.Position,
+		components.Renderable,
+		components.Bond,
+		components.Door](world)
+
+	system := &PairSystem{
+		DoorSelector:   generic.NewFilter4[Position, Renderable, Bond, Door](),
+		SwitchSelector: generic.NewFilter4[Position, Renderable, Bond, Switch](),
+		World:          world,
+		GridContainer:  gridcontainer,
+		DoorMapper:     doormapper,
+	}
+
+	return system
+}
+
+func (system *PairSystem) Update() error {
+	observer := observers.GetGameObserver(system.World)
+	posID := ecs.ComponentID[components.Position](system.World)
+	veloID := ecs.ComponentID[components.Velocity](system.World)
+
+	query := system.SwitchSelector.Query(system.World)
+	relID := ecs.ComponentID[Bond](system.World)
+
+	EntitiesToSwitch := []*ToggleDoor{}
+
+	for query.Next() {
+		swpos, _, _, switcher := query.Get()
+
+		for _, player := range observer.GetPlayers() {
+			if !system.World.Alive(player) {
+				continue
+			}
+
+			playerposition := (*Position)(system.World.Get(player, posID))
+			playervelocity := (*Velocity)(system.World.Get(player, veloID))
+
+			ok, newpos := swpos.Intersects(playerposition, playervelocity)
+			if ok {
+				// player moved on top of the switch
+				switcher.Toggle()
+				// open door
+				door := system.World.Relations().Get(query.Entity(), relID)
+				EntitiesToSwitch = append(EntitiesToSwitch,
+					&ToggleDoor{Entity: door, Open: true})
+
+				playervelocity.Change(Stop)
+				playerposition.Set(newpos)
+
+			}
+		}
+	}
+
+	for _, toggle := range EntitiesToSwitch {
+		_, _, _, door := system.DoorMapper.Get(toggle.Entity)
+		door.Toggle()
+	}
+
+	return nil
+}
+
+func (system *PairSystem) Draw(screen *ebiten.Image) {
+	op := &ebiten.DrawImageOptions{}
+	query := system.SwitchSelector.Query(system.World)
+
+	for query.Next() {
+		pos, _, _, switcher := query.Get()
+
+		op.GeoM.Reset()
+		op.GeoM.Translate(float64(pos.X), float64(pos.Y))
+		screen.DrawImage(switcher.Sprite(), op)
+	}
+
+	doorquery := system.DoorSelector.Query(system.World)
+
+	for doorquery.Next() {
+		pos, _, _, door := doorquery.Get()
+
+		op.GeoM.Reset()
+		op.GeoM.Translate(float64(pos.X), float64(pos.Y))
+		screen.DrawImage(door.Sprite(), op)
+	}
+
+}