added primary and secondary player mode

systems/player_system.go

@@ -1,10 +1,12 @@
 package systems
 
 import (
+	"log/slog"
 	. "openquell/components"
 	. "openquell/config"
 
 	"github.com/hajimehoshi/ebiten/v2"
+	"github.com/hajimehoshi/ebiten/v2/inpututil"
 	"github.com/mlange-42/arche/ecs"
 	"github.com/mlange-42/arche/generic"
 )
@@ -34,10 +36,41 @@ func NewPlayerSystem(world *ecs.World, grid *GridSystem) *PlayerSystem {
 }
 
 func (system PlayerSystem) Update() error {
+	// first check if we need to switch player
+	switchable := false
 	query := system.Selector.Query(system.World)
-
 	for query.Next() {
-		playerposition, velocity, _, _, _ := query.Get()
+		_, _, player, _, _ := query.Get()
+		if !player.IsPrimary {
+			switchable = true
+		}
+	}
+
+	if switchable {
+		query := system.Selector.Query(system.World)
+		for query.Next() {
+			_, _, player, render, _ := query.Get()
+			if inpututil.IsKeyJustPressed(ebiten.KeyTab) {
+				slog.Debug("switch players")
+				if player.IsPrimary {
+					player.IsPrimary = false
+					render.Image = player.SwitchSprite()
+				} else {
+					player.IsPrimary = true
+					render.Image = player.SwitchSprite()
+				}
+			}
+		}
+	}
+
+	// check player movements etc
+	query = system.Selector.Query(system.World)
+	for query.Next() {
+		playerposition, velocity, player, _, _ := query.Get()
+
+		if !player.IsPrimary {
+			continue
+		}
 
 		if !velocity.Moving() {
 			switch {