diff options
Diffstat (limited to 'advtrains/helpers.lua')
| -rw-r--r-- | advtrains/helpers.lua | 266 |
1 files changed, 266 insertions, 0 deletions
diff --git a/advtrains/helpers.lua b/advtrains/helpers.lua new file mode 100644 index 0000000..91c0c1c --- /dev/null +++ b/advtrains/helpers.lua @@ -0,0 +1,266 @@ +--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
+ y_offset=y_offset-1
+
+ nextnode_ok, nextdir1, nextdir2, nextrely1, nextrely2, nextrailheight=advtrains.get_rail_info_at(advtrains.round_vector_floor_y(next), drives_on)
+ if(not nextnode_ok) then
+ --atprint("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+8)%16)==chkdir and nextrely1==chkrely-y_offset) or (((nextdir2+8)%16)==chkdir and nextrely2==chkrely-y_offset) ) then
+ --atprint("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), drives_on)
+ if(not nextnode_ok) then
+ --atprint("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+8)%16)==chkdir and nextrely1==chkrely) or (((nextdir2+8)%16)==chkdir and nextrely2==chkrely) ) then
+ --atprint("in conway: one below "..minetest.pos_to_string(next).." rail not connecting, returning!")
+ --atprint(" in order mid1,2,next1,2,chkdir "..middir1.." "..middir2.." "..nextdir1.." "..nextdir2.." "..chkdir)
+ return nil
+ end
+ end
+
+ --atprint("conway found rail.")
+ return vector.add(advtrains.round_vector_floor_y(next), {x=0, y=nextrailheight, z=0}), chkdir
+end
+--TODO use this
+function advtrains.oppd(dir)
+ return ((dir+8)%16)
+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)
+ atlog("Dumping a path:")
+ if not path then atlog("dumppath: no path(nil)") return end
+ local temp_path={}
+ for ipt, iit in pairs(path) do
+ temp_path[#temp_path+1]={i=ipt, p=iit}
+ end
+ table.sort(temp_path, function (k1, k2) return k1.i < k2.i end)
+ for _,pit in ipairs(temp_path) do
+ atlog(pit.i.." > "..minetest.pos_to_string(pit.p))
+ 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
+ --atprint("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))
+ --atprint("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
+ --atprint("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)
+ --atprint("y "..(y1*360/(2*math.pi)).." "..(y2*360/(2*math.pi)))
+ return y1+advtrains.minAngleDiffRad(y1, y2)*pct
+end
+function advtrains.get_real_index_position(path, index)
+ if not path or not index then return end
+
+ local first_pos=path[math.floor(index)]
+ local second_pos=path[math.floor(index)+1]
+
+ if not first_pos or not second_pos then return nil end
+
+ local factor=index-math.floor(index)
+ local actual_pos={x=first_pos.x-(first_pos.x-second_pos.x)*factor, y=first_pos.y-(first_pos.y-second_pos.y)*factor, z=first_pos.z-(first_pos.z-second_pos.z)*factor,}
+ return actual_pos
+end
+function advtrains.pos_median(pos1, pos2)
+ return {x=pos1.x-(pos1.x-pos2.x)*0.5, y=pos1.y-(pos1.y-pos2.y)*0.5, z=pos1.z-(pos1.z-pos2.z)*0.5}
+end
+function advtrains.abs_ceil(i)
+ return math.ceil(math.abs(i))*math.sign(i)
+end
+
+function advtrains.serialize_inventory(inv)
+ local ser={}
+ local liszts=inv:get_lists()
+ for lisztname, liszt in pairs(liszts) do
+ ser[lisztname]={}
+ for idx, item in ipairs(liszt) do
+ local istring=item:to_string()
+ if istring~="" then
+ ser[lisztname][idx]=istring
+ end
+ end
+ end
+ return minetest.serialize(ser)
+end
+function advtrains.deserialize_inventory(sers, inv)
+ local ser=minetest.deserialize(sers)
+ if ser then
+ inv:set_lists(ser)
+ return true
+ end
+ return false
+end
+
+--is_protected wrapper that checks for protection_bypass privilege
+function advtrains.is_protected(pos, name)
+ if not name then
+ error("advtrains.is_protected() called without name parameter!")
+ end
+ if minetest.check_player_privs(name, {protection_bypass=true}) then
+ --player can bypass protection
+ return false
+ end
+ return minetest.is_protected(pos, name)
+end
+
+function advtrains.ms_to_kmh(speed)
+ return speed * 3.6
+end
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