From 69b5bed15b38d26c8840c083bfecaf74cf098ea4 Mon Sep 17 00:00:00 2001
From: lisyarus <lisyarus@gmail.com>
Date: Sun, 18 Aug 2024 23:53:52 +0300
Subject: [PATCH] Add crossing

---
 source/application.cpp | 58 ++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 56 insertions(+), 2 deletions(-)

diff --git a/source/application.cpp b/source/application.cpp
index 67a783d..c5bab4d 100644
--- a/source/application.cpp
+++ b/source/application.cpp
@@ -191,6 +191,11 @@ namespace gmtk
 		transformer_type type;
 	};
 
+	struct crossing
+	{
+		psemek_ecs_declare_uuid("crossing")
+	};
+
 	struct zoomer
 	{
 		psemek_ecs_declare_uuid("zoomer")
@@ -525,6 +530,17 @@ namespace gmtk
 			draw_transformer(v.location, t.type, false);
 		});
 
+		map.world.apply<vertex const, crossing const>([&](vertex const & v, crossing const &)
+		{
+			auto wbox = v.location.bbox(-0.2f);
+			auto sbox = v.location.bbox(-0.3f);
+
+			gfx::color_rgba color{64, 64, 64, 255};
+
+			painter.rect({wbox[0], sbox[1]}, color);
+			painter.rect({sbox[0], wbox[1]}, color);
+		});
+
 		map.world.apply<vertex const, lab const>([&](vertex const & v, lab const & l)
 		{
 			painter.rect(v.location.bbox(-0.2f), {128, 192, 255, 255});
@@ -748,6 +764,17 @@ namespace gmtk
 				}
 			}
 
+			if (event.down && event.key == app::keycode::T)
+			{
+				if (selected_ && !map_.world.index<index>().find(*selected_))
+				{
+					map_.world.create(
+						vertex{*selected_},
+						crossing{}
+					);
+				}
+			}
+
 			if (event.down && event.key == app::keycode::Z)
 			{
 				if (selected_ && !map_.world.index<index>().find(*selected_))
@@ -892,8 +919,8 @@ namespace gmtk
 				if (i.target)
 				{
 					{
-						auto & v = map_.world.get(map_.world.index<path_index>().get(i.start)).get<path_vertex const>();
-						if (!v.belts_to.contains(i.target))
+						auto & v = map_.world.get(i.target).get<path_vertex const>();
+						if (v.belts_from.empty() && v.belts_to.empty())
 						{
 							map_.world.detach<occupied>(i.target);
 							map_.world.destroy(entity);
@@ -933,6 +960,33 @@ namespace gmtk
 						return;
 					}
 
+					if (map_.world.get(*cell).contains<crossing>())
+					{
+						auto c = i.start.up().down();
+						auto d = c.coords - i.start.coords;
+						auto n = c.moved(d);
+
+						auto & index = map_.world.index<path_index>();
+
+						auto se = index.get(i.start);
+						auto ce = index.get(c);
+						auto ne = index.get(n);
+
+						if (map_.world.get(se).get<path_vertex>().belts_to.contains(ce))
+						{
+							if (map_.world.get(ce).get<path_vertex>().belts_to.contains(ne) && !map_.world.get(ne).contains<occupied>())
+							{
+								i.target = ne;
+								map_.world.attach(ne, occupied{entity});
+							}
+							else
+							{
+								map_.world.attach(se, occupied{entity});
+							}
+							return;
+						}
+					}
+
 					if (map_.world.get(*cell).get_if<transformer>())
 					{
 						auto se = map_.world.index<path_index>().get(i.start);