Change controls for trains (again)

3 files changed, 154 insertions, 79 deletions

diff --git a/advtrains/init.lua b/advtrains/init.lua
index 99849cb..4834a45 100644
--- a/advtrains/init.lua
+++ b/advtrains/init.lua
@@ -271,7 +271,7 @@ advtrains.avt_save = function(remove_players_from_wagons)
 		local v=advtrains.save_keys(train, {
 			"last_pos", "last_pos_prev", "movedir", "velocity", "tarvelocity",
 			"trainparts", "savedpos_off_track_index_offset", "recently_collided_with_env",
-			"atc_brake_target", "atc_wait_finish", "atc_command", "atc_delay", "door_state"
+			"atc_brake_target", "atc_wait_finish", "atc_command", "atc_delay", "door_open"
 		})
 		--then invalidate
 		if train.index then
diff --git a/advtrains/trainhud.lua b/advtrains/trainhud.lua
index 78c7624..9b7b9e8 100644
--- a/advtrains/trainhud.lua
+++ b/advtrains/trainhud.lua
@@ -1,9 +1,11 @@
 --trainhud.lua: holds all the code for train controlling
 
 advtrains.hud = {}
+advtrains.hhud = {}
 
 minetest.register_on_leaveplayer(function(player)
 advtrains.hud[player:get_player_name()] = nil
+advtrains.hhud[player:get_player_name()] = nil
 end)
 
 local mletter={[1]="F", [-1]="R", [0]="N"}
@@ -40,12 +42,23 @@ function advtrains.on_control_change(pc, train, flip)
 		end
 		--shift+use:see wagons.lua
 	else
+		local act=false
 		if pc.up then
-		   train.tarvelocity = math.min(train.tarvelocity + 1, maxspeed)
+		   train.lever=4
+		   act=true
+		end
+		if pc.jump then
+			train.lever = 1
+			act=true
 		end
 		if pc.down then
 			if train.velocity>0 then
-				train.tarvelocity = math.max(train.tarvelocity - 1, 0)
+				if pc.jump then
+					train.lever = 0
+				else
+					train.lever = 2
+				end
+				act=true
 			else
 				train.movedir = -train.movedir
 			end
@@ -64,12 +77,7 @@ function advtrains.on_control_change(pc, train, flip)
 				train.door_open = train.movedir
 			end
 		end
-		if train.brake_hold_state~=2 then
-			train.brake = false
-		end
-		if pc.jump then
-			train.brake = true
-		end
+		train.active_control = act
 		if pc.aux1 then
 			--horn
 		end
@@ -109,6 +117,44 @@ function advtrains.set_trainhud(name, text)
 		hud.oldText=text
 	end
 end
+function advtrains.set_help_hud(name, text)
+	local hud = advtrains.hhud[name]
+	local player=minetest.get_player_by_name(name)
+	if not player then
+	   return
+	end
+	if not hud then
+		hud = {}
+		advtrains.hhud[name] = hud
+		hud.id = player:hud_add({
+			hud_elem_type = "text",
+			name = "ADVTRAINS_HELP",
+			number = 0xFFFFFF,
+			position = {x=1, y=0.3},
+			offset = {x=0, y=0},
+			text = text,
+			scale = {x=200, y=60},
+			alignment = {x=1, y=0},
+		})
+		hud.oldText=text
+		return
+	elseif hud.oldText ~= text then
+		player:hud_change(hud.id, "text", text)
+		hud.oldText=text
+	end
+end
+
+--train.lever:
+--Speed control lever in train, for new train control system.
+--[[
+Value	Disp	Control	Meaning
+0		BB		S+Space	Emergency Brake
+1		B		Space	Normal Brake
+2		-		S		Roll
+3		o		<none>	Stay at speed
+4		+		W		Accelerate
+]]
+
 function advtrains.hud_train_format(train, flip)
 	local fct=flip and -1 or 1
 	if not train then return "" end
@@ -118,9 +164,19 @@ function advtrains.hud_train_format(train, flip)
 	local tvel=advtrains.abs_ceil(train.tarvelocity)
 	local vel_kmh=advtrains.abs_ceil(advtrains.ms_to_kmh(train.velocity))
 	local tvel_kmh=advtrains.abs_ceil(advtrains.ms_to_kmh(train.tarvelocity))
+	
+	local levers = "B - o +"
+	local tlev=train.lever
+	if train.velocity==0 and not train.active_control then tlev=1 end
+	if tlev == 0 then levers = ">BB< - o +" end
+	if tlev == 1 then levers = ">B< - o +" end
+	if tlev == 2 then levers = "B >-< o +" end
+	if tlev == 3 then levers = "B - >o< +" end
+	if tlev == 4 then levers = "B - o >+<" end
+	
 	local topLine, firstLine, secondLine
 	
-	topLine="  ["..mletter[fct*train.movedir].."]  "..doorstr[(train.door_open or 0) * train.movedir].."  "..(train.brake and "="..( train.brake_hold_state==2 and "^" or "" ).."B=" or "")
+	topLine="  ["..mletter[fct*train.movedir].."]  {"..levers.."} "..doorstr[(train.door_open or 0) * train.movedir]
 	firstLine=attrans("Speed:").." |"..string.rep("+", vel)..string.rep("_", max-vel).."> "..vel_kmh.." km/h"
 	secondLine=attrans("Target:").." |"..string.rep("+", tvel)..string.rep("_", max-tvel).."> "..tvel_kmh.." km/h"
 	
diff --git a/advtrains/trainlogic.lua b/advtrains/trainlogic.lua
index 4a0b26c..5681817 100644
--- a/advtrains/trainlogic.lua
+++ b/advtrains/trainlogic.lua
@@ -31,11 +31,20 @@ function endstep()
 	end
 end
 
-advtrains.train_accel_force=2--per second and divided by number of wagons
-advtrains.train_brake_force=3--per second, not divided by number of wagons
-advtrains.train_roll_force=0.5--per second, not divided by number of wagons, acceleration when rolling without brake
-advtrains.train_emerg_force=10--for emergency brakes(when going off track)
-
+--acceleration for lever modes (trainhud.lua), per wagon
+local t_accel_all={
+	[0] = -10,
+	[1] = -3,
+	[2] = -0.5,
+	[4] = 0,
+}
+--acceleration per engine
+local t_accel_eng={
+	[0] = 0,
+	[1] = 0,
+	[2] = 0,
+	[4] = 2,
+}
 
 advtrains.mainloop_trainlogic=function(dtime)
 	--build a table of all players indexed by pts. used by damage and door system.
@@ -226,15 +235,16 @@ function advtrains.train_step_a(id, train, dtime)
 	
 	--- 3. handle velocity influences ---
 	local train_moves=(train.velocity~=0)
+	local tarvel_cap
 	
 	if train.recently_collided_with_env then
-		train.tarvelocity=0
+		tarvel_cap=0
 		if not train_moves then
 			train.recently_collided_with_env=nil--reset status when stopped
 		end
 	end
 	if train.locomotives_in_train==0 then
-		train.tarvelocity=0
+		tarvel_cap=0
 	end
 	
 	--- 3a. this can be useful for debugs/warnings and is used for check_trainpartload ---
@@ -250,86 +260,95 @@ function advtrains.train_step_a(id, train, dtime)
 	local pprint
 	
 	if front_off_track and back_off_track then--allow movement in both directions
-		if train.tarvelocity>1 then
-			train.tarvelocity=1
-			atprint("Train",t_info,"is off track at both ends. Clipping velocity to 1")
-			pprint=true
-		end
+		tarvel_cap=1
 	elseif front_off_track then--allow movement only backward
-		if train.movedir==1 and train.tarvelocity>0 then
-			train.tarvelocity=0
-			atprint("Train",t_info,"is off track. Trying to drive further out. Velocity clipped to 0")
-			pprint=true
+		if train.movedir==1 then
+			tarvel_cap=0
 		end
-		if train.movedir==-1 and train.tarvelocity>1 then
-			train.tarvelocity=1
-			atprint("Train",t_info,"is off track. Velocity clipped to 1")
-			pprint=true
+		if train.movedir==-1 then
+			tarvel_cap=1
 		end
 	elseif back_off_track then--allow movement only forward
-		if train.movedir==-1 and train.tarvelocity>0 then
-			train.tarvelocity=0
-			atprint("Train",t_info,"is off track. Trying to drive further out. Velocity clipped to 0")
-			pprint=true
+		if train.movedir==1 then
+			tarvel_cap=1
 		end
-		if train.movedir==1 and train.tarvelocity>1 then
-			train.tarvelocity=1
-			atprint("Train",t_info,"is off track. Velocity clipped to 1")
-			pprint=true
+		if train.movedir==-1 then
+			tarvel_cap=0
 		end
 	end
-	if pprint then
-		atprint("max_iot", train.max_index_on_track, "min_iot", train.min_index_on_track, "<> index", train.index, "end_index", train.end_index)
-	end
 	
-	--interpret ATC command
-	if train.atc_brake_target and train.atc_brake_target>=train.velocity then
-		train.atc_brake_target=nil
-	end
-	if train.atc_wait_finish then
-		if not train.atc_brake_target and train.velocity==train.tarvelocity then
-			train.atc_wait_finish=nil
+	--interpret ATC command and apply auto-lever control when not actively controlled
+	local trainvelocity = train.velocity
+	if not train.lever then train.lever=3 end
+	if train.active_control then
+		advtrains.atc.train_reset_command(id)
+	else
+		if train.atc_brake_target and train.atc_brake_target>=trainvelocity then
+			train.atc_brake_target=nil
 		end
-	end
-	if train.atc_command then
-		if train.atc_delay<=0 and not train.atc_wait_finish then
-			advtrains.atc.execute_atc_command(id, train)
-		else
-			train.atc_delay=train.atc_delay-dtime
+		if train.atc_wait_finish then
+			if not train.atc_brake_target and train.velocity==train.tarvelocity then
+				train.atc_wait_finish=nil
+			end
+		end
+		if train.atc_command then
+			if train.atc_delay<=0 and not train.atc_wait_finish then
+				advtrains.atc.execute_atc_command(id, train)
+			else
+				train.atc_delay=train.atc_delay-dtime
+			end
+		end
+		
+		train.lever = 3
+		if train.tarvelocity>trainvelocity then train.lever=4 end
+		if train.tarvelocity<trainvelocity then
+			if (train.atc_brake_target and train.atc_brake_target<trainvelocity) then
+				train.lever=1
+			else
+				train.lever=2
+			end
 		end
 	end
 	
-	--make brake adjust the tarvelocity if necessary
-	if train.brake and (math.ceil(train.velocity)-1)<train.tarvelocity then
-		train.tarvelocity=math.max((math.ceil(train.velocity)-1), 0)
+	if tarvel_cap and tarvel_cap<train.tarvelocity then
+		train.tarvelocity=tarvel_cap
+	end
+	local tmp_lever = train.lever
+	if tarvel_cap and trainvelocity>tarvel_cap then
+		tmp_lever = 0
 	end
 	
 	--- 3a. actually calculate new velocity ---
-	if train.velocity~=train.tarvelocity then
-		local applydiff=0
-		local mass=#train.trainparts
-		local diff=train.tarvelocity-train.velocity
-		if diff>0 then--accelerating, force will be brought on only by locomotives.
-			--atprint("accelerating with default force")
-			applydiff=(math.min((advtrains.train_accel_force*train.locomotives_in_train*dtime)/mass, math.abs(diff)))
-		else--decelerating
-			if front_off_track or back_off_track or train.recently_collided_with_env then --every wagon has a brake, so not divided by mass.
-				--atprint("braking with emergency force")
-				applydiff= -(math.min((advtrains.train_emerg_force*dtime), math.abs(diff)))
-			elseif train.brake or (train.atc_brake_target and train.atc_brake_target<train.velocity) then
-				--atprint("braking with default force")
-				--no math.min, because it can grow beyond tarvelocity, see up there
-				--dont worry, it will never fall below zero.
-				applydiff= -((advtrains.train_brake_force*dtime))
-			else
-				--atprint("roll")
-				applydiff= -(math.min((advtrains.train_roll_force*dtime), math.abs(diff)))
+	if tmp_lever~=3 then
+		local acc_all = t_accel_all[tmp_lever]
+		local acc_eng = t_accel_eng[tmp_lever]
+		local nwagons = #train.trainparts
+		local accel = acc_all + (acc_eng*train.locomotives_in_train)/nwagons
+		local vdiff = accel*dtime
+		if not train.active_control then
+			local tvdiff = train.tarvelocity - trainvelocity
+			if math.abs(vdiff) > math.abs(tvdiff) then
+				--applying this change would cross tarvelocity
+				vdiff=tvdiff
 			end
 		end
-		train.last_accel=(applydiff*train.movedir)
-		train.velocity=math.min(math.max( train.velocity+applydiff , 0), train.max_speed or 10)
+		if tarvel_cap and trainvelocity<=tarvel_cap and trainvelocity+vdiff>tarvel_cap then
+			vdiff = tarvel_cap - train.velocity
+		end
+		if trainvelocity+vdiff < 0 then
+			vdiff = - trainvelocity
+		end
+		local mspeed = (train.max_speed or 10)
+		if trainvelocity+vdiff > mspeed then
+			vdiff = mspeed - trainvelocity
+		end
+		train.last_accel=(vdiff*train.movedir)
+		train.velocity=train.velocity+vdiff
+		if train.active_control then
+			train.tarvelocity = train.velocity
+		end
 	else
-		train.last_accel=0
+		train.last_accel = 0
 	end
 	
 	--- 4. move train ---