mirror of
https://github.com/sys4-fr/server-nalc.git
synced 2024-12-25 18:20:36 +01:00
383 lines
7.9 KiB
Lua
Executable File
383 lines
7.9 KiB
Lua
Executable File
local load_time_start = os.clock()
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function vector.pos_to_string(pos)
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return "("..pos.x.."|"..pos.y.."|"..pos.z..")"
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end
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local r_corr = 0.25 --remove a bit more nodes (if shooting diagonal) to let it look like a hole (sth like antialiasing)
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-- this doesn't need to be calculated every time
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local f_1 = 0.5-r_corr
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local f_2 = 0.5+r_corr
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--returns information about the direction
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local function get_used_dir(dir)
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local abs_dir = {x=math.abs(dir.x), y=math.abs(dir.y), z=math.abs(dir.z)}
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local dir_max = math.max(abs_dir.x, abs_dir.y, abs_dir.z)
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if dir_max == abs_dir.x then
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local tab = {"x", {x=1, y=dir.y/dir.x, z=dir.z/dir.x}}
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if dir.x >= 0 then
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tab[3] = "+"
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end
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return tab
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end
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if dir_max == abs_dir.y then
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local tab = {"y", {x=dir.x/dir.y, y=1, z=dir.z/dir.y}}
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if dir.y >= 0 then
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tab[3] = "+"
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end
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return tab
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end
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local tab = {"z", {x=dir.x/dir.z, y=dir.y/dir.z, z=1}}
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if dir.z >= 0 then
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tab[3] = "+"
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end
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return tab
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end
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local function node_tab(z, d)
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local n1 = math.floor(z*d+f_1)
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local n2 = math.floor(z*d+f_2)
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if n1 == n2 then
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return {n1}
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end
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return {n1, n2}
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end
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local function return_line(pos, dir, range) --range ~= length
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local tab = {}
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local num = 1
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local t_dir = get_used_dir(dir)
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local dir_typ = t_dir[1]
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if t_dir[3] == "+" then
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f_tab = {0, range, 1}
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else
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f_tab = {0, -range, -1}
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end
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local d_ch = t_dir[2]
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if dir_typ == "x" then
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for d = f_tab[1],f_tab[2],f_tab[3] do
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local x = d
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local ytab = node_tab(d_ch.y, d)
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local ztab = node_tab(d_ch.z, d)
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for _,y in ipairs(ytab) do
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for _,z in ipairs(ztab) do
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tab[num] = {x=pos.x+x, y=pos.y+y, z=pos.z+z}
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num = num+1
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end
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end
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end
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elseif dir_typ == "y" then
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for d = f_tab[1],f_tab[2],f_tab[3] do
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local xtab = node_tab(d_ch.x, d)
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local y = d
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local ztab = node_tab(d_ch.z, d)
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for _,x in ipairs(xtab) do
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for _,z in ipairs(ztab) do
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tab[num] = {x=pos.x+x, y=pos.y+y, z=pos.z+z}
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num = num+1
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end
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end
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end
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else
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for d = f_tab[1],f_tab[2],f_tab[3] do
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local xtab = node_tab(d_ch.x, d)
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local ytab = node_tab(d_ch.y, d)
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local z = d
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for _,x in ipairs(xtab) do
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for _,y in ipairs(ytab) do
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tab[num] = {x=pos.x+x, y=pos.y+y, z=pos.z+z}
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num = num+1
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end
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end
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end
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end
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return tab
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end
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local function table_contains2(t, v)
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for i = #t, 1, -1 do
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if t[i] == v then
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return true
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end
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end
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return false
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end
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local function return_fine_line(pos, dir, range, scale)
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local ps1 = return_line(vector.round(vector.multiply(pos, scale)), dir, range*scale)
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local ps2 = {}
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local ps2_num = 1
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for _,p1 in ipairs(ps1) do
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local p2 = vector.round(vector.divide(p1, scale))
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if not table_contains2(ps2, p2) then
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ps2[ps2_num] = p2
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ps2_num = ps2_num+1
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end
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end
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return ps2
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end
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function vector.fine_line(pos, dir, range, scale)
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--assert_vector(pos)
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if not range then --dir = pos2
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dir = vector.direction(pos, dir)
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range = vector.distance(pos, dir)
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end
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return return_fine_line(pos, dir, range, scale)
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end
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function vector.line(pos, dir, range, alt)
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--assert_vector(pos)
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if alt then
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if not range then --dir = pos2
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dir, range = vector.direction(pos, dir), vector.distance(pos, dir)
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end
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return return_line(pos, dir, range)
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end
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if range then --dir = pos2
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dir = vector.round(vector.multiply(dir, range))
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else
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dir = vector.subtract(dir, pos)
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end
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local line,n = {},1
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for _,i in ipairs(vector.threeline(dir.x, dir.y, dir.z)) do
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line[n] = {x=pos.x+i[1], y=pos.y+i[2], z=pos.z+i[3]}
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n = n+1
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end
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return line
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end
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local twolines = {}
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function vector.twoline(x, y)
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local pstr = x.." "..y
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local line = twolines[pstr]
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if line then
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return line
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end
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line = {}
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local n = 1
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local dirx = 1
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if x < 0 then
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dirx = -dirx
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end
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local ymin, ymax = 0, y
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if y < 0 then
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ymin, ymax = ymax, ymin
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end
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local m = y/x --y/0 works too
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local dir = 1
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if m < 0 then
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dir = -dir
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end
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for i = 0,x,dirx do
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local p1 = math.max(math.min(math.floor((i-0.5)*m+0.5), ymax), ymin)
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local p2 = math.max(math.min(math.floor((i+0.5)*m+0.5), ymax), ymin)
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for j = p1,p2,dir do
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line[n] = {i, j}
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n = n+1
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end
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end
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twolines[pstr] = line
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return line
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end
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local threelines = {}
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function vector.threeline(x, y, z)
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local pstr = x.." "..y.." "..z
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local line = threelines[pstr]
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if line then
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return line
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end
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if x ~= math.floor(x) then
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print("[vector_extras] INFO: The position used for vector.threeline isn't round.")
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end
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local two_line = vector.twoline(x, y)
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line = {}
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local n = 1
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local zmin, zmax = 0, z
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if z < 0 then
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zmin, zmax = zmax, zmin
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end
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local m = z/math.hypot(x, y)
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local dir = 1
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if m < 0 then
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dir = -dir
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end
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for _,i in ipairs(two_line) do
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local px, py = unpack(i)
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local ph = math.hypot(px, py)
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local z1 = math.max(math.min(math.floor((ph-0.5)*m+0.5), zmax), zmin)
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local z2 = math.max(math.min(math.floor((ph+0.5)*m+0.5), zmax), zmin)
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for pz = z1,z2,dir do
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line[n] = {px, py, pz}
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n = n+1
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end
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end
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threelines[pstr] = line
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return line
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end
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function vector.straightdelay(s, v, a)
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if not a then
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return s/v
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end
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return (math.sqrt(v*v+2*a*s)-v)/a
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end
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vector.zero = {x=0, y=0, z=0}
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function vector.sun_dir(time)
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if not time then
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time = minetest.get_timeofday()
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end
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local t = (time-0.5)*5/6+0.5 --the sun rises at 5 o'clock, not at 6
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if t < 0.25
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or t > 0.75 then
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return
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end
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local tmp = math.cos(math.pi*(2*t-0.5))
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return {x=tmp, y=math.sqrt(1-tmp*tmp), z=0}
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end
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function vector.inside(pos, minp, maxp)
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for _,i in ipairs({"x", "y", "z"}) do
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if pos[i] < minp[i]
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or pos[i] > maxp[i] then
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return false
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end
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end
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return true
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end
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function vector.minmax(p1, p2)
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local p1 = vector.new(p1) --Are these 2 redefinitions necessary?
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local p2 = vector.new(p2)
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for _,i in ipairs({"x", "y", "z"}) do
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if p1[i] > p2[i] then
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p1[i], p2[i] = p2[i], p1[i]
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end
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end
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return p1, p2
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end
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function vector.move(p1, p2, s)
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return vector.round(
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vector.add(
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vector.multiply(
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vector.direction(
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p1,
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p2
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),
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s
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),
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p1
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)
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)
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end
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local explosion_tables = {}
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function vector.explosion_table(r)
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local table = explosion_tables[r]
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if table then
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return table
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end
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local t1 = os.clock()
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local tab, n = {}, 1
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local tmp = r*r + r
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for x=-r,r do
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for y=-r,r do
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for z=-r,r do
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local rc = x*x+y*y+z*z
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if rc <= tmp then
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local np={x=x, y=y, z=z}
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if math.floor(math.sqrt(rc) +0.5) > r-1 then
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tab[n] = {np, true}
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else
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tab[n] = {np}
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end
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n = n+1
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end
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end
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end
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end
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explosion_tables[r] = tab
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print(string.format("[vector_extras] table created after ca. %.2fs", os.clock() - t1))
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return tab
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end
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local circle_tables = {}
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function vector.circle(r)
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local table = circle_tables[r]
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if table then
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return table
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end
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local t1 = os.clock()
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local tab, n = {}, 1
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for i = -r, r do
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for j = -r, r do
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if math.floor(math.sqrt(i*i+j*j)+0.5) == r then
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tab[n] = {x=i, y=0, z=j}
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n = n+1
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end
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end
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end
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circle_tables[r] = tab
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print(string.format("[vector_extras] table created after ca. %.2fs", os.clock() - t1))
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return tab
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end
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local ring_tables = {}
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function vector.ring(r)
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local table = ring_tables[r]
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if table then
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return table
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end
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local t1 = os.clock()
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local tab, n = {}, 1
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local tmp = r*r
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local p = {x=math.floor(r+0.5), z=0}
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while p.x > 0 do
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tab[n] = p
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n = n+1
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local p1, p2 = {x=p.x-1, z=p.z}, {x=p.x, z=p.z+1}
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local dif1 = math.abs(tmp-p1.x*p1.x-p1.z*p1.z)
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local dif2 = math.abs(tmp-p2.x*p2.x-p2.z*p2.z)
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if dif1 <= dif2 then
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p = p1
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else
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p = p2
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end
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end
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local tab2, n = {}, 1
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for _,i in ipairs(tab) do
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for _,j in ipairs({
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{i.x, i.z},
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{-i.z, i.x},
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{-i.x, -i.z},
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{i.z, -i.x},
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}) do
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tab2[n] = {x=j[1], y=0, z=j[2]}
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n = n+1
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end
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end
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ring_tables[r] = tab2
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print(string.format("[vector_extras] table created after ca. %.2fs", os.clock() - t1))
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return tab2
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end
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function vector.chunkcorner(pos)
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return {x=pos.x-pos.x%16, y=pos.y-pos.y%16, z=pos.z-pos.z%16}
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end
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dofile(minetest.get_modpath("vector_extras").."/vector_meta.lua")
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print(string.format("[vector_extras] loaded after ca. %.2fs", os.clock() - load_time_start))
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