74 lines
1.6 KiB
Lua
74 lines
1.6 KiB
Lua
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function generate_terrain(seed)
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if(seed!=nil)srand(seed)
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local complexity=11
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-- generate a random heightmap
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local hmap={}
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for x=0,127 do
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hmap[x]={}
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for y=0,127 do
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hmap[x][y]=rnd(complexity)
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end
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end
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-- smooth the heightmap using a simple average filter
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local function smooth()
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local temp={}
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for x=0,127 do
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temp[x]={}
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for y=0,127 do
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local sum=0
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local ct=0
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for dx=-1,1 do
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for dy=-1,1 do
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local nx=x+dx
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local ny=y+dy
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if nx>-1 and nx<128 and ny>-1 and ny<128 then
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sum+=hmap[nx][ny]
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ct+=1
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end
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end
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end
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temp[x][y]=sum/ct
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end
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end
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hmap=temp
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end
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-- smooth the heightmap 5 times
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for i=1,4 do
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smooth()
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end
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--setting the pixel values
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for x=0,127 do
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for y=0,127 do
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local val=(hmap[x][y])
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--write your own logic here!
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--this could be substituted
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--with mset() or sth similar
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--and take the values into
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--account.ill provide a small
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--example
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if val<4.5 then
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--deep water
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sset(x,y,1)
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elseif val<5 then
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--water
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sset(x,y,12)
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elseif val<5.2 then
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--beach
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sset(x,y,9)
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elseif val<6 then
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--grass
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sset(x,y,3)
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elseif val<6.7 then
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--mountain
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sset(x,y,13)
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else
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--snow
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sset(x,y,6)
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end
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end
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end
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end
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