From 2c383640d699680e99c79f0aa2601df9e0843f00 Mon Sep 17 00:00:00 2001
From: wvpm <24685035+wvpm@users.noreply.github.com>
Date: Wed, 13 Dec 2023 11:56:26 +0100
Subject: Calculate distance between adjacencies

---
 src/openvic-simulation/map/Map.cpp      |  8 +++++---
 src/openvic-simulation/map/Province.cpp | 14 +++++++++++++-
 src/openvic-simulation/map/Province.hpp | 10 +++++++---
 3 files changed, 25 insertions(+), 7 deletions(-)

diff --git a/src/openvic-simulation/map/Map.cpp b/src/openvic-simulation/map/Map.cpp
index b272f1f..1e68cc6 100644
--- a/src/openvic-simulation/map/Map.cpp
+++ b/src/openvic-simulation/map/Map.cpp
@@ -612,10 +612,12 @@ bool Map::load_map_images(fs::path const& province_path, fs::path const& terrain
 bool Map::_generate_province_adjacencies() {
 	bool changed = false;
 
-	auto generate_adjacency = [&](Province* cur, size_t x, size_t y) -> bool {
+	auto generate_adjacency = [&](Province* current, size_t x, size_t y) -> bool {
 		Province* neighbour = get_province_by_index(province_shape_image[x + y * width].index);
-		if (neighbour != nullptr && cur != neighbour) {
-			return cur->add_adjacency(neighbour, 0, 0) | neighbour->add_adjacency(cur, 0, 0);
+		if (neighbour != nullptr && current != neighbour) {
+			const Province::distance_t distance = current->calculate_distance_to(neighbour);
+			const Province::flags_t flags = 0;
+			return current->add_adjacency(neighbour, distance, flags) | neighbour->add_adjacency(current, distance, flags);
 		}
 		return false;
 	};
diff --git a/src/openvic-simulation/map/Province.cpp b/src/openvic-simulation/map/Province.cpp
index 8094463..717ef35 100644
--- a/src/openvic-simulation/map/Province.cpp
+++ b/src/openvic-simulation/map/Province.cpp
@@ -121,7 +121,7 @@ Province::adjacency_t::adjacency_t(Province const* province, distance_t distance
 	assert(province != nullptr);
 }
 
-bool Province::is_adjacent_to(Province const* province) {
+bool Province::is_adjacent_to(Province const* province) const {
 	for (adjacency_t adj : adjacencies) {
 		if (adj.province == province) {
 			return true;
@@ -142,6 +142,18 @@ bool Province::add_adjacency(Province const* province, distance_t distance, flag
 	return true;
 }
 
+fvec2_t Province::get_unit_position() const {
+	return positions.unit.value_or(positions.center);
+}
+
+Province::distance_t Province::calculate_distance_to(Province const* province) const {
+	const fvec2_t my_unit_position = get_unit_position();
+	const fvec2_t other_unit_position = province->get_unit_position();
+	const fvec2_t distance_vector = other_unit_position - my_unit_position;
+	const fixed_point_t distance = distance_vector.length_squared();
+	return static_cast<Province::distance_t>(distance);
+}
+
 bool Province::reset(BuildingTypeManager const& building_type_manager) {
 	terrain_type = default_terrain_type;
 	life_rating = 0;
diff --git a/src/openvic-simulation/map/Province.hpp b/src/openvic-simulation/map/Province.hpp
index 37ecdaa..2f8068e 100644
--- a/src/openvic-simulation/map/Province.hpp
+++ b/src/openvic-simulation/map/Province.hpp
@@ -26,7 +26,7 @@ namespace OpenVic {
 
 		using index_t = uint16_t;
 		using life_rating_t = int8_t;
-		using distance_t = uint16_t;
+		using distance_t = fixed_point_t;
 		using flags_t = uint16_t;
 
 		enum struct colony_status_t : uint8_t { STATE, PROTECTORATE, COLONY };
@@ -47,7 +47,7 @@ namespace OpenVic {
 			fvec2_t text;
 			fixed_point_t text_rotation;
 			fixed_point_t text_scale;
-			fvec2_t unit;
+			std::optional<fvec2_t> unit;
 			fvec2_t city;
 			fvec2_t factory;
 			fvec2_t building_construction;
@@ -90,6 +90,8 @@ namespace OpenVic {
 		fixed_point_map_t<Culture const*> PROPERTY(culture_distribution);
 		fixed_point_map_t<Religion const*> PROPERTY(religion_distribution);
 
+		fvec2_t get_unit_position() const;
+
 		Province(std::string_view new_identifier, colour_t new_colour, index_t new_index);
 
 	public:
@@ -109,9 +111,11 @@ namespace OpenVic {
 		void update_state(Date today);
 		void tick(Date today);
 
-		bool is_adjacent_to(Province const* province);
+		bool is_adjacent_to(Province const* province) const;
 		bool add_adjacency(Province const* province, distance_t distance, flags_t flags);
 
+		distance_t calculate_distance_to(Province const* province) const;
+
 		bool reset(BuildingTypeManager const& building_type_manager);
 		bool apply_history_to_province(ProvinceHistoryEntry const* entry);
 	};
-- 
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