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--advtrains by orwell96, see readme.txt
local print=function(t) minetest.log("action", t) minetest.chat_send_all(t) end
function advtrains.dirCoordSet(coord, dir)
local x=0
local z=0
--local dir=(dirx+2)%8
if(dir==6) then
x=-1
elseif (dir==7) then
x=-1
z=1
elseif (dir==0) then
z=1
elseif (dir==1) then
z=1
x=1
elseif (dir==2) then
x=1
elseif (dir==3) then
x=1
z=-1
elseif (dir==4) then
z=-1
elseif (dir==5) then
z=-1
x=-1
else
error("advtrains: in helpers.lua/dirCoordSet() given dir="..(dir or "nil"))
end
return {x=coord.x+x, y=coord.y, z=coord.z+z}
end
function advtrains.dirToCoord(dir)
return advtrains.dirCoordSet({x=0, y=0, z=0}, dir)
end
function advtrains.maxN(list, expectstart)
local n=expectstart or 0
while list[n] do
n=n+1
end
return n-1
end
function advtrains.minN(list, expectstart)
local n=expectstart or 0
while list[n] do
n=n-1
end
return n+1
end
--vertical_transmit:
--[[
rely1, rely2 tell to which height the connections are pointed to. 1 means it will go up the next node
]]
function advtrains.conway(midreal, prev, traintype)--in order prev,mid,return
local mid=advtrains.round_vector_floor_y(midreal)
local drives_on=advtrains.all_traintypes[traintype].drives_on
if not advtrains.get_rail_info_at(advtrains.round_vector_floor_y(prev), traintype) then
return nil
end
local midnode_ok, middir1, middir2, midrely1, midrely2=advtrains.get_rail_info_at(advtrains.round_vector_floor_y(mid), traintype)
if not midnode_ok then
return nil
end
local next, chkdir, chkrely, y_offset
y_offset=0
--print("[advtrains] in order mid1,mid2",middir1,middir2)
--try if it is dir1
local cor1=advtrains.dirCoordSet(mid, middir2)--<<<<
if math.floor(cor1.x+0.5)==math.floor(prev.x+0.5) and math.floor(cor1.z+0.5)==math.floor(prev.z+0.5) then--this was previous
next=advtrains.dirCoordSet(mid, middir1)
if midrely1>=1 then
next.y=next.y+1
--print("[advtrains]found midrely1 to be >=1: next is now "..(next and minetest.pos_to_string(next) or "nil"))
y_offset=1
end
chkdir=middir1
chkrely=midrely1
--print("[advtrains]dir2 applied next pos:",minetest.pos_to_string(next),"(chkdir is ",chkdir,")")
end
--dir2???
local cor2=advtrains.dirCoordSet(mid, middir1)--<<<<
if math.floor(cor2.x+0.5)==math.floor(prev.x+0.5) and math.floor(cor2.z+0.5)==math.floor(prev.z+0.5) then
next=advtrains.dirCoordSet(mid, middir2)--dir2 wird berprft, alles gut.
if midrely2>=1 then
next.y=next.y+1
--print("[advtrains]found midrely2 to be >=1: next is now "..(next and minetest.pos_to_string(next) or "nil"))
y_offset=1
end
chkdir=middir2
chkrely=midrely2
--print("[advtrains] dir2 applied next pos:",minetest.pos_to_string(next),"(chkdir is ",chkdir,")")
end
--print("[advtrains]dir applied next pos: "..(next and minetest.pos_to_string(next) or "nil").."(chkdir is "..(chkdir or "nil")..", y-offset "..y_offset..")")
--is there a next
if not next then
print("[advtrains]in conway: no next rail(nil), returning!")
return nil
end
local nextnode_ok, nextdir1, nextdir2, nextrely1, nextrely2, nextrailheight=advtrains.get_rail_info_at(advtrains.round_vector_floor_y(next), traintype)
--is it a rail?
if(not nextnode_ok) then
print("[advtrains]in conway: next "..minetest.pos_to_string(next).." not a rail, trying one node below!")
next.y=next.y-1
y_offset=y_offset-1
nextnode_ok, nextdir1, nextdir2, nextrely1, nextrely2, nextrailheight=advtrains.get_rail_info_at(advtrains.round_vector_floor_y(next), traintype)
if(not nextnode_ok) then
print("[advtrains]in conway: one below "..minetest.pos_to_string(next).." is not a rail either, returning!")
return nil
end
end
--is this next rail connecting to the mid?
if not ( (((nextdir1+4)%8)==chkdir and nextrely1==chkrely-y_offset) or (((nextdir2+4)%8)==chkdir and nextrely2==chkrely-y_offset) ) then
print("[advtrains]in conway: next "..minetest.pos_to_string(next).." not connecting, trying one node below!")
next.y=next.y-1
y_offset=y_offset-1
nextnode_ok, nextdir1, nextdir2, nextrely1, nextrely2, nextrailheight=advtrains.get_rail_info_at(advtrains.round_vector_floor_y(next), traintype)
if(not nextnode_ok) then
print("[advtrains]in conway: (at connecting if check again) one below "..minetest.pos_to_string(next).." is not a rail either, returning!")
return nil
end
if not ( (((nextdir1+4)%8)==chkdir and nextrely1==chkrely) or (((nextdir2+4)%8)==chkdir and nextrely2==chkrely) ) then
print("[advtrains]in conway: one below "..minetest.pos_to_string(next).." rail not connecting, returning!")
--print("[advtrains] in order mid1,2,next1,2,chkdir "..middir1.." "..middir2.." "..nextdir1.." "..nextdir2.." "..chkdir)
return nil
end
end
--print("[advtrains]conway found rail.")
return vector.add(advtrains.round_vector_floor_y(next), {x=0, y=nextrailheight, z=0}), chkdir
end
function advtrains.round_vector_floor_y(vec)
return {x=math.floor(vec.x+0.5), y=math.floor(vec.y), z=math.floor(vec.z+0.5)}
end
function advtrains.yawToDirection(yaw, conn1, conn2)
if not conn1 or not conn2 then
error("given nil to yawToDirection: conn1="..(conn1 or "nil").." conn2="..(conn1 or "nil"))
end
local yaw1=math.pi*(conn1/4)
local yaw2=math.pi*(conn2/4)
if advtrains.minAngleDiffRad(yaw, yaw1)<advtrains.minAngleDiffRad(yaw, yaw2) then--change to > if weird behavior
return conn2
else
return conn1
end
end
function advtrains.minAngleDiffRad(r1, r2)
local try1=r2-r1
local try2=(r2+2*math.pi)-r1
local try3=r2-(r1+2*math.pi)
if math.min(math.abs(try1), math.abs(try2), math.abs(try3))==math.abs(try1) then
return try1
end
if math.min(math.abs(try1), math.abs(try2), math.abs(try3))==math.abs(try2) then
return try2
end
if math.min(math.abs(try1), math.abs(try2), math.abs(try3))==math.abs(try3) then
return try3
end
end
function advtrains.dumppath(path)
if not path then print("dumppath: no path(nil)") return end
local min=advtrains.minN(path)
local max=advtrains.maxN(path)
for i=min, max do print("["..i.."] "..(path[i] and minetest.pos_to_string(path[i]) or "nil")) end
end
function advtrains.merge_tables(a, ...)
local new={}
for _,t in ipairs({a,...}) do
for k,v in pairs(t) do new[k]=v end
end
return new
end
function advtrains.yaw_from_3_positions(prev, curr, next)
local pts=minetest.pos_to_string
--print("p3 "..pts(prev)..pts(curr)..pts(next))
local prev2curr=math.atan2((curr.x-prev.x), (prev.z-curr.z))
local curr2next=math.atan2((next.x-curr.x), (curr.z-next.z))
--print("y3 "..(prev2curr*360/(2*math.pi)).." "..(curr2next*360/(2*math.pi)))
return prev2curr+(advtrains.minAngleDiffRad(prev2curr, curr2next)/2)
end
function advtrains.get_wagon_yaw(front, first, second, back, pct)
local pts=minetest.pos_to_string
--print("p "..pts(front)..pts(first)..pts(second)..pts(back))
local y2=advtrains.yaw_from_3_positions(second, first, front)
local y1=advtrains.yaw_from_3_positions(back, second, first)
--print("y "..(y1*360/(2*math.pi)).." "..(y2*360/(2*math.pi)))
return y1+advtrains.minAngleDiffRad(y1, y2)*pct
end
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