mtcontrib/mapgen_rivers
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Optionally center the map around x=0 z=0

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Gael-de-Sailly
2020-12-20 22:28:54 +01:00
parent 53f88d337d
commit d5cf4a6267
3 changed files with 23 additions and 0 deletions
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19
polygons.lua
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@ -59,6 +59,12 @@ end
local blocksize = mapgen_rivers.blocksize
local min_catchment = mapgen_rivers.min_catchment
local max_catchment = mapgen_rivers.max_catchment
local map_offset, map_offset_blocks
local center = mapgen_rivers.center
if center then
map_offset = {x=math.floor(X/2), z=math.floor(Z/2)}
map_offset_blocks = {x=map_offset.x/blocksize, z=map_offset.z/blocksize}
end
-- Width coefficients: coefficients solving
-- wfactor * min_catchment ^ wpower = 1/(2*blocksize)
@ -89,6 +95,12 @@ local init = false
-- On map generation, determine into which polygon every point (in 2D) will fall.
-- Also store polygon-specific data
local function make_polygons(minp, maxp)
if center then
minp = {x=minp.x+map_offset.x, z=minp.z+map_offset.z}
maxp = {x=maxp.x+map_offset.x, z=maxp.z+map_offset.z}
map_offset_x_blocks = map_offset.x / blocksize
end
if not init then
if glaciers then
noise_heat = minetest.get_perlin(mapgen_rivers.noise_params.heat)
@ -164,6 +176,13 @@ local function make_polygons(minp, maxp)
polygon.dem = poly_dem
polygon.lake = math.min(lakes[iA], lakes[iB], lakes[iC], lakes[iD])
if center then
for i=1, 4 do
poly_x[i] = poly_x[i] - map_offset_blocks.x
poly_z[i] = poly_z[i] - map_offset_blocks.z
end
end
-- Now, rivers.
-- Load river flux values for the 4 corners
local riverA = river_width(rivers[iA])