Add modifiable wagon extents

This will be required for advcarts

advtrains/api_doc.txt

@@ -71,6 +71,13 @@ advtrains.register_wagon(name, prototype, description, inventory_image)
 	wagon_span=2,
 	^- How far this wagon extends from its base position. Is the half of the wagon length.
 	^- Used to determine in which distance the other wagons have to be positioned. Will require tweaking.
+	extent_h = 1,
+	^- Determines the collision box extent in x/z direction. Defaults to 1 (=3x3)
+	^- The actual bounding box size is (extent_h*2)+1, so 0 means 1x1, 1 means 3x3 and 2 means 5x5
+	extent_v = 2,
+	^- Determines the collision box extent in y direction. Defaults to 2 (=3).
+	^- The actual bounding box size is extent_v+1, so 0 means 1, 1 means 2, 2 means 3 a.s.o.
+	
 	drops = {"default:steelblock 3"}
 	^- List of itemstrings what to drop when the wagon is destroyed
 	

advtrains/couple.lua

@@ -15,8 +15,8 @@ local couple_max_dist=3
 minetest.register_entity("advtrains:discouple", {
 	visual="sprite",
 	textures = {"advtrains_discouple.png"},
-	collisionbox = {-0.5,-0.5,-0.5, 0.5,0.5,0.5},
-	visual_size = {x=1, y=1},
+	collisionbox = {-0.3,-0.3,-0.3, 0.3,0.3,0.3},
+	visual_size = {x=0.7, y=0.7},
 	initial_sprite_basepos = {x=0, y=0},
 	
 	is_discouple=true,
@@ -101,8 +101,8 @@ train2_is_backpos
 minetest.register_entity("advtrains:couple", {
 	visual="sprite",
 	textures = {"advtrains_couple.png"},
-	collisionbox = {-0.5,-0.5,-0.5, 0.5,0.5,0.5},
-	visual_size = {x=1, y=1},
+	collisionbox = {-0.3,-0.3,-0.3, 0.3,0.3,0.3},
+	visual_size = {x=0.7, y=0.7},
 	initial_sprite_basepos = {x=0, y=0},
 	
 	is_couple=true,
@@ -114,6 +114,7 @@ minetest.register_entity("advtrains:couple", {
 				self.object:remove()
 				return
 			end
+			self.object:set_armor_groups({immmortal=1})
 		end)
 	end,
 	get_staticdata=function(self) return "COUPLE" end,

advtrains/init.lua

@@ -101,7 +101,7 @@ sid=function(id) if id then return string.sub(id, -6) end end
 
 if minetest.settings:get_bool("advtrains_enable_debugging") then
 	atprint=function(t, ...)
-		local context=advtrains.atprint_context_tid
+		local context=advtrains.atprint_context_tid or ""
 		if not context then return end
 		local text=advtrains.print_concat_table({t, ...})
 		advtrains.drb_record(context, text)
@@ -303,7 +303,7 @@ advtrains.mainloop_runcnt=0
 minetest.register_globalstep(function(dtime_mt)
 	return advtrains.pcall(function()
 		advtrains.mainloop_runcnt=advtrains.mainloop_runcnt+1
-		atprint("Running the main loop, runcnt",advtrains.mainloop_runcnt)
+		--atprint("Running the main loop, runcnt",advtrains.mainloop_runcnt)
 		--call load once. see advtrains.load() comment
 		if not init_load then
 			advtrains.load()

advtrains/trainlogic.lua

@@ -498,7 +498,8 @@ function advtrains.train_step_b(id, train, dtime)
 	
 	-- when paths get cleared, the old indices set above will be up-to-date and represent the state in which the last run of this code was made
 	local ifo, ifn, ibo, ibn = train.detector_old_index, atround(train.index), train.detector_old_end_index, atround(train.end_index)
-	
+	--atprint(ifo,">", ifn, "<==>", ibo,">", ibn)
+		
 	local path=train.path
 	
 	if train.enter_node_all then
@@ -557,6 +558,10 @@ function advtrains.train_step_b(id, train, dtime)
 	local train_moves=(train.velocity~=0)
 	
 	if train_moves then
+	
+		--TO BE REMOVED:
+		if not train.extent_h then advtrains.update_trainpart_properties(id, train) end
+		
 		local collpos
 		local coll_grace=1
 		if train.movedir==1 then
@@ -566,8 +571,8 @@ function advtrains.train_step_b(id, train, dtime)
 		end
 		if collpos then
 			local rcollpos=advtrains.round_vector_floor_y(collpos)
-			for x=-1,1 do
-				for z=-1,1 do
+			for x=-train.extent_h,train.extent_h do
+				for z=-train.extent_h,train.extent_h do
 					local testpos=vector.add(rcollpos, {x=x, y=0, z=z})
 					--- 8a Check collision ---
 					if advtrains.detector.occupied(testpos, id) then
@@ -648,6 +653,8 @@ function advtrains.update_trainpart_properties(train_id, invert_flipstate)
 	train.drives_on=advtrains.merge_tables(advtrains.all_tracktypes)
 	--FIX: deep-copy the table!!!
 	train.max_speed=20
+	train.extent_h = 0;
+	
 	local rel_pos=0
 	local count_l=0
 	for i, w_id in ipairs(train.trainparts) do
@@ -696,6 +703,8 @@ function advtrains.update_trainpart_properties(train_id, invert_flipstate)
 				end
 			end
 			train.max_speed=math.min(train.max_speed, wagon.max_speed)
+			train.extent_h = math.max(train.extent_h, wagon.extent_h or 1);
+			
 			if i==1 then
 				train.couple_lock_front=wagon.lock_couples
 			end

advtrains/wagons.lua

@@ -415,9 +415,11 @@ function wagon:on_step(dtime)
 		--checking for environment collisions(a 3x3 cube around the center)
 		if not gp.recently_collided_with_env then
 			local collides=false
-			for x=-1,1 do
-				for y=0,2 do
-					for z=-1,1 do
+			local exh = self.extent_h or 1
+			local exv = self.extent_v or 2
+			for x=-exh,exh do
+				for y=0,exv do
+					for z=-exh,exh do
 						local node=minetest.get_node_or_nil(vector.add(first_pos, {x=x, y=y, z=z}))
 						if (advtrains.train_collides(node)) then
 							collides=true