Add white room browsing mode

main.lua

@@ -194,6 +194,8 @@ function love.keypressed(key)
 	elseif editorView ~= "world" and editorView ~= "wire" and Input.isPlayerSwitch(key) then
 		local c = Input.playerColor(key)
 		gameWorld:switchPlayerColor(currentRoom, c)
+	elseif editorView ~= "world" and editorView ~= "wire" and gameWorld:browseRoom(currentRoom, key) then
+		return
 	end
 
 	-- if key == "w" then

room.lua

@@ -140,7 +140,8 @@ function Room:draw()
 	-- draw only the channels the player has. Each object just exposes sprites per
 	-- channel via Entity:draw(channel); a door registered on all three channels
 	-- naturally draws its red sprite on the red pass, etc. No per-object logic.
-	for _, channel in ipairs(self.colorsPlayerHas) do
+	local drawChannels = gameWorld and gameWorld.roomBrowseMode and {"red", "green", "blue"} or self.colorsPlayerHas
+	for _, channel in ipairs(drawChannels) do
 		if self.player[channel] then self.player[channel]:draw(channel) end
 		for _, entity in pairs(self.collideables[channel]) do entity:draw(channel) end
 		-- The zoomed-out neighbourhood already draws every room directly. Calling
@@ -201,8 +202,11 @@ function Room:drawWiresAt(originX, originY, cellSize, selectedCircuit, editorCol
 	table.sort(ordered)
 
 	love.graphics.setBlendMode("alpha")
-	local visibleColors = {red = false, green = false, blue = false}
+	local showAllChannels = gameWorld and gameWorld.roomBrowseMode
-	for _, color in ipairs(self.colorsPlayerHas or {}) do visibleColors[color] = true end
+	local visibleColors = {red = showAllChannels, green = showAllChannels, blue = showAllChannels}
+	if not showAllChannels then
+		for _, color in ipairs(self.colorsPlayerHas or {}) do visibleColors[color] = true end
+	end
 	local editorIsOn = editorView ~= nil and editorView ~= "off"
 	for _, circuitId in ipairs(ordered) do
 		local selected = not selectedCircuit or selectedCircuit == circuitId

tests/test_wire.lua

@@ -370,6 +370,27 @@ test("co-located colours join the active player selection", function()
 		"separated blue player should still select by itself")
 end)
 
+test("WASD room browsing changes view without moving players", function()
+	local player = {x = 3, y = 4}
+	local roomA = {name = "a", player = {red = player}}
+	local roomB = {name = "b", player = {green = {x = 7, y = 8}}}
+	local world = setmetatable({
+		levels = {a = roomA, b = roomB},
+		roomByName = {a = {name = "a", x = 1, y = 1}, b = {name = "b", x = 2, y = 1}},
+		rooms = {{name = "a", x = 1, y = 1}, {name = "b", x = 2, y = 1}},
+	}, {__index = World})
+	local oldCurrentRoom, oldSetEditorRoomName = currentRoom, setEditorRoomName
+	currentRoom = roomA
+	setEditorRoomName = function() end
+
+	assertTrue(world:browseRoom(roomA, "d"))
+	assertTrue(currentRoom == roomB)
+	assertTrue(world.roomBrowseMode)
+	assertTrue(player.x == 3 and player.y == 4, "browsing moved the player")
+
+	currentRoom, setEditorRoomName = oldCurrentRoom, oldSetEditorRoomName
+end)
+
 test("one run cannot terminate at two different switches", function()
 	local second = switch("red", 1, 2)
 	local world, _, roomB = makeWorld(second)

world.lua

@@ -663,6 +663,7 @@ function World:playerJoinCheck(room, previousPositions, newPositions)
 end
 
 function World:movePlayer(room, key)
+	self.roomBrowseMode = false
 	local directions = {
 		up = {x = 0, y = -1, axis = "y"}, down = {x = 0, y = 1, axis = "y"},
 		left = {x = -1, y = 0, axis = "x"}, right = {x = 1, y = 0, axis = "x"},
@@ -714,6 +715,7 @@ function World:movePlayer(room, key)
 end
 
 function World:switchPlayerColor(room, color)
+	self.roomBrowseMode = false
 	local player = room.player[color]
 	if not player then
 		-- A colour copy can be parked in another world room.  Number keys are a
@@ -771,6 +773,19 @@ function World:switchPlayerColor(room, color)
 	return canSwitch
 end
 
+-- Developer room browser. It changes only the displayed room; players,
+-- collision, and runtime save state remain untouched.
+function World:browseRoom(room, key)
+	local exits = {a = "left", d = "right", w = "top", s = "bottom"}
+	local destinationName = exits[key] and self:getNeighbor(room.name, exits[key])
+	local destination = destinationName and self.levels[destinationName]
+	if not destination then return false end
+	currentRoom = destination
+	self.roomBrowseMode = true
+	if setEditorRoomName then setEditorRoomName(destination.name) end
+	return true
+end
+
 function World:tick(room)
 	room:tickLocal()
 	self:rebuildCollision()