Refactor meta -> shared

FreshShit/_Shared/Colorer.lua

@@ -0,0 +1,66 @@
+---@alias Color {r: number, g: number, b: number}
+---@class Colorer
+---@field colors table<number, Color>
+---@field breakpoints table<number>
+Colorer = {
+	--- Make sure colors and breakpoints always have the same number of entries! VERY IMPORTANT!
+	---@type table<number, Color>
+	colors = {
+		{ r = 0.62, g = 0.62, b = 0.62 }, -- Grey
+		{ r = 1,    g = 1,    b = 1 }, -- White
+		{ r = 0.12, g = 1,    b = 0 }, -- Green
+		{ r = 0,    g = 0.44, b = 0.87 }, -- Blue
+		{ r = 0.64, g = 0.21, b = 0.93 }, -- Purple
+		{ r = 1,    g = 0.5,  b = 0 }, -- Orange
+		{ r = 0.9,  g = 0.8,  b = 0.5 }, -- Light Gold
+		{ r = 0,    g = 0.8,  b = 1.0 }, -- Blizzard Blue
+	},
+	breakpoints = { -999, -10, -5, -2, 2, 5, 10, 999 },
+
+	---@param value number
+	---@return Color, nil|string
+	Interpolate = function(value)
+		local color = { r = 0, g = 0, b = 0 }
+
+		---@type table<number, table<number, number>>
+		local bracket = { { 0, 0 }, { 1, 1 } }
+		for i = 1, #Colorer.breakpoints do
+			if value < Colorer.breakpoints[i] then
+				bracket[2] = { i, Colorer.breakpoints[i] }
+				break
+			end
+			bracket[1] = { i, Colorer.breakpoints[i] }
+		end
+
+		---@type Color
+		local startColor = Colorer.colors[bracket[1][1]]
+		---@type Color
+		local endColor = Colorer.colors[bracket[2][1]]
+
+		local fraction = (value - bracket[1][2]) / (bracket[2][2] - bracket[1][2])
+
+		for k, v in pairs(startColor) do
+			color[k] = Colorer.lerp(v, endColor[k], fraction)
+		end
+
+		return color, nil
+	end,
+
+	---@param color Color
+	---@return string
+	RGBToHex = function(color)
+		local r = math.floor(color.r * 255)
+		local g = math.floor(color.g * 255)
+		local b = math.floor(color.b * 255)
+		return string.format("%02x%02x%02x", r, g, b)
+	end,
+
+	---@param a number
+	---@param b number
+	---@param t number
+	---@return number
+	lerp = function(a, b, t)
+		return a * (1 - t) + b * t
+	end
+}
+setmetatable(Colorer, { __index = Colorer })