* Initial commit

LICENSE

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+MIT License
+
+Copyright (c) 2016 avosirenfal
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

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+# What does this mod do?
+
+This mod makes automated trains (NOT manual trains) automatically color themselves whenever they start moving on a path with an appropriate color based on the resource they're carrying. If a train is carrying more than one type of resource the color will blend appropriately (e.g. iron is blue, copper is red- carrying 50% iron and 50% copper will make the train purple)
+
+- Colors
+    - Coal: Black
+    - Steel Plate: White
+    - Iron Ore/Iron Plate: Blue-ish
+    - Copper Ore/Copper Plate: Red-ish
+    - Raw wood/wood: Brown
+
+# (For developers) Compatibility
+
+I have not added an API or support for any other mods, but if you would me to add an API let me know. Alternatively, you may contact me and let me know appropriate RGB colors (same as in game) for each of your resource types, as well as their internal name and I'll add them to the base mod. 

Train_Ore_Color_1.0.0/colorblend.lua

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+local rgb_scale = 255.0
+local cmyk_scale = 100.0
+
+-- color mixing
+-- http://stackoverflow.com/a/30079700/1316748
+
+local function rgb_to_cmyk(r,g,b)
+	if r == 0 and g == 0 and b == 0 then
+		return {
+			['c'] = 0,
+			['m'] = 0,
+			['y'] = 0,
+			['k'] = cmyk_scale,
+		}
+	end
+
+	-- rgb [0,255] -> cmy [0,1]
+	c = 1 - r / rgb_scale
+	m = 1 - g / rgb_scale
+	y = 1 - b / rgb_scale
+
+	-- extract out k [0,1]
+	min_cmy = math.min(c, m, y)
+	c = (c - min_cmy) 
+	m = (m - min_cmy) 
+	y = (y - min_cmy) 
+	k = min_cmy
+
+	-- rescale to the range [0,cmyk_scale]
+	return {
+		['c'] = c*cmyk_scale,
+		['m'] = m*cmyk_scale,
+		['y'] = y*cmyk_scale,
+		['k'] = k*cmyk_scale,
+	}
+end
+
+local function _clamp(v, min, max)
+	if(v < min) then
+		return min
+	elseif(v > max) then
+		return max
+	else
+		return v
+	end
+end
+
+local function cmyk_to_rgb(c,m,y,k)
+	r = rgb_scale*(1.0-(c+k)/cmyk_scale)
+	g = rgb_scale*(1.0-(m+k)/cmyk_scale)
+	b = rgb_scale*(1.0-(y+k)/cmyk_scale)
+
+	return {
+		['r'] = _clamp(math.floor(r), 0, 255),
+		['g'] = _clamp(math.floor(g), 0, 255),
+		['b'] = _clamp(math.floor(b), 0, 255),
+	}
+end
+
+function ink_add_for_rgb(colors)
+	-- input: list of rgb, opacity (r,g,b,o) colours to be added, o acts as weights (may be nil)
+	local C = 0
+	local M = 0
+	local Y = 0
+	local K = 0
+
+	for _, color in pairs(colors) do
+		local cmyk = rgb_to_cmyk(color.r, color.g, color.b)
+		local o = color.o or 0.5
+
+		C = C + (o*cmyk.c)
+		M = M + (o*cmyk.m)
+		Y = Y + (o*cmyk.y)
+		K = K + (o*cmyk.k)
+	end
+
+	return cmyk_to_rgb(C, M, Y, K)
+end

Train_Ore_Color_1.0.0/control.lua

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+require('util')
+require('colorblend')
+-- for k,v in pairs(ink_add_for_rgb({
+--    {['r'] = 255, ['g'] = 100, ['b'] = 0},
+--    {['r'] = 0, ['g'] = 0, ['b'] = 255},
+-- })) do
+--     print(tostring(k) .. ': ' .. tostring(v))
+-- end
+
+colors = {
+	[{['coal']=true}] = {
+		['r'] = 0,
+		['g'] = 0,
+		['b'] = 0,
+	},
+	[{['steel-plate']=true}] = {
+		['r'] = 255,
+		['g'] = 255,
+		['b'] = 255,
+	},
+	[{['iron-ore']=true, ['iron-plate']=true}] = {
+		['r'] = 0,
+		['g'] = 50,
+		['b'] = 200,
+	},
+	[{['copper-ore']=true, ['copper-plate']=true}] = {
+		['r'] = 255,
+		['g'] = 50,
+		['b'] = 0,
+	},
+	[{['raw-wood']=true, ['wood']=true}] = {
+		['r'] = 116,
+		['g'] = 37,
+		['b'] = 0,
+	},
+}
+
+script.on_event(defines.events.on_train_changed_state, function(event)
+	local train = event.train
+	if(train.state == defines.train_state.on_the_path and not train.manual_mode and #train.cargo_wagons > 0) then
+		local total = 0
+		local hit = 0
+		calc = {}
+
+		for name, count in pairs(train.get_contents()) do
+			for key, color in pairs(colors) do
+				if(key[name] ~= nil) then
+
+					if(calc[key] ~= nil) then
+						calc[key] = calc[key] + count
+					else
+						hit = hit + 1
+						calc[key] = count
+					end
+
+					total = total + count
+				end
+			end
+		end
+		-- for _, cargo in pairs(train.cargo_wagons) do
+		-- 	game.print(#(cargo.get_inventory(defines.inventory.chest)))
+		-- end
+
+		if(hit < 1) then
+			return
+		elseif(hit == 1) then
+			-- lua is stupid...
+			local asdf = nil
+
+			for k,v in pairs(calc) do
+				asdf = k
+				break
+			end
+
+			if(asdf == nil) then
+				error('Train_Ore_Color: nil color selection')
+			end
+
+			color = colors[asdf]
+		else
+			color_mix = {}
+
+			for key, count in pairs(calc) do
+				r = table.deepcopy(colors[key])
+				r['o'] = count / total
+				table.insert(color_mix, r)
+			end
+
+			color = ink_add_for_rgb(color_mix)
+		end
+
+		final_color = {
+			['r'] = color.r / 255,
+			['g'] = color.g / 255,
+			['b'] = color.b / 255,
+			['a'] = 0.498, -- vanilla UI uses this alpha
+		}
+
+		for _, locomotive in pairs(train.locomotives['front_movers']) do
+			locomotive.color = final_color
+		end
+
+		for _, locomotive in pairs(train.locomotives['back_movers']) do
+			locomotive.color = final_color
+		end
+	end
+end)

Train_Ore_Color_1.0.0/info.json

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+{
+	"name": "Train_Ore_Color",
+	"version": "1.0.0",
+	"title": "Train Ore Color",
+	"author": "Sirenfal",
+	"description": "Sets train colors based on their contents",
+	"dependencies": ["base >= 0.14.0"],
+	"factorio_version": "0.14.0"
+}