new module

modules/corpse_markers.lua

@@ -0,0 +1,67 @@
+local function draw_map_tag(surface, force, position)
+	force.add_chart_tag(surface, {icon = {type = 'item', name = 'heavy-armor'}, position = position, text = "   "})
+end
+
+local function is_tag_valid(tag)
+	if tag.icon.type ~= "item" then return end
+	if tag.icon.name ~= "heavy-armor" then return end
+	if tag.text ~= "   " then return end
+	return true
+end
+
+local function get_corpse_force(corpse)
+	if corpse.character_corpse_player_index then return game.players[corpse.character_corpse_player_index].force end
+	return game.forces.neutral
+end
+
+local function destroy_all_tags()
+	for _, force in pairs(game.forces) do
+		for _, surface in pairs(game.surfaces) do
+			for _, tag in pairs(force.find_chart_tags(surface)) do
+				if is_tag_valid(tag) then tag.destroy() end
+			end
+		end
+	end
+end
+
+local function redraw_all_tags()
+	for _, surface in pairs(game.surfaces) do
+		for _, corpse in pairs(surface.find_entities_filtered({name = "character-corpse"})) do
+			draw_map_tag(corpse.surface, get_corpse_force(corpse), corpse.position)
+		end
+	end
+end
+
+local function find_and_destroy_tag(corpse)
+	local force = get_corpse_force(corpse)
+	for _, tag in pairs(force.find_chart_tags(corpse.surface, {{corpse.position.x - 0.1, corpse.position.y - 0.1}, {corpse.position.x + 0.1, corpse.position.y + 0.1}})) do		
+		if is_tag_valid(tag) then
+			tag.destroy()
+			return true
+		end		
+	end
+	return false
+end
+
+local function on_player_died(event)
+	local player = game.players[event.player_index]
+	draw_map_tag(player.surface, player.force, player.position)
+end
+
+local function on_character_corpse_expired(event)
+	if find_and_destroy_tag(event.corpse) then return end
+	destroy_all_tags()
+	redraw_all_tags()
+end
+
+local function on_pre_player_mined_item(event)
+	if event.entity.name ~= "character-corpse" then return end	
+	if find_and_destroy_tag(event.entity) then return end
+	destroy_all_tags()
+	redraw_all_tags()
+end
+
+local event = require 'utils.event'
+event.add(defines.events.on_player_died, on_player_died)
+event.add(defines.events.on_character_corpse_expired, on_character_corpse_expired)
+event.add(defines.events.on_pre_player_mined_item, on_pre_player_mined_item)