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--advtrains by orwell96, see readme.txt
advtrains.dir_trans_tbl={
[0]={x=0, z=1},
[1]={x=1, z=2},
[2]={x=1, z=1},
[3]={x=2, z=1},
[4]={x=1, z=0},
[5]={x=2, z=-1},
[6]={x=1, z=-1},
[7]={x=1, z=-2},
[8]={x=0, z=-1},
[9]={x=-1, z=-2},
[10]={x=-1, z=-1},
[11]={x=-2, z=-1},
[12]={x=-1, z=0},
[13]={x=-2, z=1},
[14]={x=-1, z=1},
[15]={x=-1, z=2},
}
function advtrains.dirCoordSet(coord, dir)
local x,z
if advtrains.dir_trans_tbl[dir] then
x,z=advtrains.dir_trans_tbl[dir].x, advtrains.dir_trans_tbl[dir].z
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, drives_on)--in order prev,mid,return
local mid=advtrains.round_vector_floor_y(midreal)
local midnode_ok, middir1, middir2, midrely1, midrely2=advtrains.get_rail_info_at(mid, drives_on)
if not midnode_ok then
return nil
end
local next, chkdir, chkrely, y_offset
y_offset=0
--atprint(" in order mid1,mid2",middir1,middir2)
--try if it is dir1
local cor1=advtrains.dirCoordSet(mid, middir2)--<<<<
if cor1.x==prev.x and cor1.z==prev.z then--this was previous
next=advtrains.dirCoordSet(mid, middir1)
if midrely1>=1 then
next.y=next.y+1
--atprint("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
--atprint("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 überprüft, alles gut.
if midrely2>=1 then
next.y=next.y+1
--atprint("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
--atprint(" dir2 applied next pos:",minetest.pos_to_string(next),"(chkdir is ",chkdir,")")
end
--atprint("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
atprint("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), drives_on)
--is it a rail?
if(not nextnode_ok) then
atprint("in conway: next "..minetest.pos_to_string(next).." not a rail, trying one node below!")
next.y=next.y-1
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