From 1ebd7d9b7b62c8e05d527611a1944ed1a876b890 Mon Sep 17 00:00:00 2001
From: ubq323 <ubq323@ubq323.website>
Date: Fri, 3 Feb 2023 19:37:28 +0000
Subject: debug drawing change, zoom clamping, partial refactoring of class
 mechanisms to allow inheritance, minor refactor of noise generator, changes
 to temp worldgen, rework of class constructor mechanism

---
 server/noise.lua | 34 +++++++++++++---------------------
 1 file changed, 13 insertions(+), 21 deletions(-)

(limited to 'server/noise.lua')

diff --git a/server/noise.lua b/server/noise.lua
index 1480448..8a83b60 100644
--- a/server/noise.lua
+++ b/server/noise.lua
@@ -1,11 +1,12 @@
 local Pos = require"common.coords".Pos
+local class = require"common.class"
 local tau = 2*math.pi
 
 math.randomseed(os.time())
 
 local function random_unit_vec()
 	local theta = math.random()*tau
-	return Pos.make(math.cos(theta),math.sin(theta))
+	return Pos:make(math.cos(theta),math.sin(theta))
 end
 local function lerp(a,b,t) return (1-t)*a + t*b end
 local function smoothstep(x)
@@ -15,14 +16,13 @@ local function smoothstep(x)
 end
 local function slerp(a,b,t) return lerp(a,b,smoothstep(t)) end
 
-local NoiseGen = {}
-NoiseGen.__index = NoiseGen
-function NoiseGen.make()
+local PerlinNoise = class()
+function PerlinNoise.make(cls)
 	local grid = {}
 	setmetatable(grid,{__index=function(t,k) t[k] = {} return t[k] end})
-	return setmetatable({grid=grid},NoiseGen)
+	return setmetatable({grid=grid},cls)
 end
-function NoiseGen.vertex(self,ix,iy)
+function PerlinNoise.vertex(self,ix,iy)
 	local v = self.grid[ix][iy]
 	if v then return v end
 	vv = random_unit_vec()
@@ -30,7 +30,7 @@ function NoiseGen.vertex(self,ix,iy)
 	return vv
 end
 
-function NoiseGen.at(self,x,y)
+function PerlinNoise.at(self,x,y)
 	local x0 = math.floor(x)
 	local y0 = math.floor(y)
 	local x1 = x0 + 1
@@ -41,7 +41,7 @@ function NoiseGen.at(self,x,y)
 	local v10 = self:vertex(x1,y0)
 	local v11 = self:vertex(x1,y1)
 
-	local p = Pos.make
+	local p = function(...) return Pos:make(...) end
 	local d00 = v00:dot(p(x-x0,y-y0))
 	local d01 = v01:dot(p(x-x0,y-y1))
 	local d10 = v10:dot(p(x-x1,y-y0))
@@ -53,17 +53,9 @@ function NoiseGen.at(self,x,y)
 	return z
 end
 
-local NoiseAgg = {}
-NoiseAgg.__index = NoiseAgg
-function NoiseAgg.make(things)
-	return setmetatable({things=things or {}},NoiseAgg)
-end
-function NoiseAgg.make_perlin_octaves(nocts)
-	local things = {}
-	for i=1,nocts do
-		table.insert(things,{amp=2^i,scale=2^(nocts-i),gen=NoiseGen.make()})
-	end
-	return NoiseAgg.make(things)
+local NoiseAgg = class()
+function NoiseAgg.make(cls,things)
+	return setmetatable({things=things or {}},cls)
 end
 function NoiseAgg.at(self,x,y)
 	local n = 0
@@ -72,7 +64,7 @@ function NoiseAgg.at(self,x,y)
 	for _,thing in ipairs(self.things) do
 		local gen,scale,amp = thing.gen,thing.scale,thing.amp
 		n = n + amp
-		t = t + gen:at(x*scale,y*scale)*amp
+		t = t + gen:at(x/scale,y/scale)*amp
 	end
 	return t/n
 end
@@ -93,4 +85,4 @@ end
 -- 	io.write("\n")
 -- end
 
-return {NoiseGen=NoiseGen,NoiseAgg=NoiseAgg}
+return {PerlinNoise=PerlinNoise,NoiseAgg=NoiseAgg}
-- 
cgit v1.2.3