Module:Infobox dim/sandbox - Revision history

Hike395: update comment

2025-04-23T14:53:08Z

update comment

← Previous revision		Revision as of 14:53, 23 April 2025
Line 10:		Line 10:
	-- This quantity depends on the latitude (which we don't have easy access to)		-- This quantity depends on the latitude (which we don't have easy access to)
	-- Instead, we'll be correct at 38 degrees N, given en-WP bias towards NA and Europe		-- Instead, we'll be correct at 38 degrees N, given en-WP bias towards NA and Europe
			-- 38N was chosen because:
			-- * It's the furthest north where scale=100000 maps to zoom=12
			-- * One hemisphere (20000km) maps to zoom=1
	local metersPerPixelLevel9 = 305.748*math.cos(math.rad(38))		local metersPerPixelLevel9 = 305.748*math.cos(math.rad(38))

2025-04-23T14:00:44Z

use 38N to not break existing zoom @ scale=100000

← Previous revision		Revision as of 14:00, 23 April 2025
Line 9:		Line 9:
	-- On the equator, it's 305.748 meters/pixel according to https://wiki.openstreetmap.org/wiki/Zoom_levels		-- On the equator, it's 305.748 meters/pixel according to https://wiki.openstreetmap.org/wiki/Zoom_levels
	-- This quantity depends on the latitude (which we don't have easy access to)		-- This quantity depends on the latitude (which we don't have easy access to)
	-- Instead, we'll be correct at ~~the geographical center of CONUS (39~~ degrees~~, 50~~ ~~minutes)~~, given en-WP bias towards NA and Europe		-- Instead, we'll be correct at 38 degrees N, given en-WP bias towards NA and Europe
	local metersPerPixelLevel9 = 305.748*math.cos(math.rad(~~39.8333333~~))		local metersPerPixelLevel9 = 305.748*math.cos(math.rad(38))

	-- Convert from Geohack's scale to OSM style zoom levels as used by <maplink>		-- Convert from Geohack's scale to OSM style zoom levels as used by <maplink>

2025-04-23T13:52:32Z

use CONUS center

← Previous revision		Revision as of 13:52, 23 April 2025
Line 9:		Line 9:
	-- On the equator, it's 305.748 meters/pixel according to https://wiki.openstreetmap.org/wiki/Zoom_levels		-- On the equator, it's 305.748 meters/pixel according to https://wiki.openstreetmap.org/wiki/Zoom_levels
	-- This quantity depends on the latitude (which we don't have easy access to)		-- This quantity depends on the latitude (which we don't have easy access to)
	-- Instead, we'll be correct at ~~40N.~~ ~~cos~~(40) = ~~0.766.~~ ~~0.766*305.748~~ ~ ~~235~~		-- Instead, we'll be correct at the geographical center of CONUS (39 degrees, 50 minutes), given en-WP bias towards NA and Europe
	local metersPerPixelLevel9 = ~~235~~		local metersPerPixelLevel9 = 305.748*math.cos(math.rad(39.8333333))

	-- Convert from Geohack's scale to OSM style zoom levels as used by <maplink>		-- Convert from Geohack's scale to OSM style zoom levels as used by <maplink>

2025-04-23T13:35:23Z

adjust which latitude we assume, from 30 to 40 degrees

← Previous revision		Revision as of 13:35, 23 April 2025
Line 107:		Line 107:
	scale = math.floor(scale+0.5)		scale = math.floor(scale+0.5)
	-- keep scale within sane bounds (OSM zoom levels 1-17)		-- keep scale within sane bounds (OSM zoom levels 1-17)
	if scale < ~~1800~~ then		if scale < 1600 then
	scale = ~~1800~~		scale = 1600
	end		end
	if scale > ~~225e6~~ then		if scale > 200e6 then
	scale = ~~225e6~~		scale = 200e6
	end		end
	return scale		return scale

2025-04-23T13:33:03Z

adjust which latitude we assume

← Previous revision		Revision as of 13:33, 23 April 2025
Line 9:		Line 9:
	-- On the equator, it's 305.748 meters/pixel according to https://wiki.openstreetmap.org/wiki/Zoom_levels		-- On the equator, it's 305.748 meters/pixel according to https://wiki.openstreetmap.org/wiki/Zoom_levels
	-- This quantity depends on the latitude (which we don't have easy access to)		-- This quantity depends on the latitude (which we don't have easy access to)
	-- Instead, we'll be correct at ~~30N,~~ cos(~~30 degrees~~) = ~~sqrt(3)/2~~		-- Instead, we'll be correct at 40N. cos(40) = 0.766. 0.766*305.748 ~ 235
	local metersPerPixelLevel9 = ~~305.748*math.sqrt(3)/2~~		local metersPerPixelLevel9 = 235

	-- Convert from Geohack's scale to OSM style zoom levels as used by <maplink>		-- Convert from Geohack's scale to OSM style zoom levels as used by <maplink>

2025-04-22T10:47:28Z

tweak scale safety bounds

← Previous revision		Revision as of 10:47, 22 April 2025
Line 106:		Line 106:
	if not scale then return end		if not scale then return end
	scale = math.floor(scale+0.5)		scale = math.floor(scale+0.5)
	-- keep scale within sane bounds		-- keep scale within sane bounds (OSM zoom levels 1-17)
	if scale < ~~2000~~ then		if scale < 1800 then
	scale = ~~2000~~		scale = 1800
	end		end
	if scale > ~~250e6~~ then		if scale > 225e6 then
	scale = ~~250e6~~		scale = 225e6
	end		end
	return scale		return scale

2025-04-22T10:41:47Z

sync

← Previous revision		Revision as of 10:41, 22 April 2025
Line 58:		Line 58:
	if t == 'city' and population and population > 0 then		if t == 'city' and population and population > 0 then
	-- assume city is a circle with density of 1000/square kilometer		-- assume city is a circle with density of 1000/square kilometer
	-- compute diameter, in meters. Then multiply by ~~1.954~~ to account for weird shapes		-- compute diameter, in meters. Then multiply by oddShape to account for weird shapes
	dim = 35.68e-3math.sqrt(population)oddShape		dim = 35.68e-3math.sqrt(population)oddShape
	-- don't zoom in too far		-- don't zoom in too far

2025-01-07T06:03:35Z

bail early from geohackTypeToDim

← Previous revision		Revision as of 06:03, 7 January 2025
Line 51:		Line 51:
	-- Convert from Geohack's types to Geohack dim		-- Convert from Geohack's types to Geohack dim
	local function geohackTypeToDim(args)		local function geohackTypeToDim(args)
	local ~~type~~ = args.type		local t = args.type
			if not t then return end
	local typeDim = mw.loadData('Module:Infobox_dim/sandbox/data')		local typeDim = mw.loadData('Module:Infobox_dim/sandbox/data')
	local dim = typeDim[~~type~~]		local dim = typeDim[t]
	local population = tonumber(args.population)		local population = tonumber(args.population)
	if ~~type~~ == 'city' and population and population > 0 then		if t == 'city' and population and population > 0 then
	-- assume city is a circle with density of 1000/square kilometer		-- assume city is a circle with density of 1000/square kilometer
	-- compute diameter, in meters. Then multiply by 1.954 to account for weird shapes		-- compute diameter, in meters. Then multiply by 1.954 to account for weird shapes

2025-01-06T15:09:25Z

move code

@@ Line 17: / Line 17: @@
 	if not scale or scale <= 0 then return end
 	return math.log(metersPerPixelLevel9*ppm/scale)/log2 + 9
 end
@@ Line 134: / Line 113: @@
 	end
 	return scale
 end

2024-11-04T13:58:35Z

avoid cleaning arguments twice

@@ Line 109: / Line 109: @@
 end
 	if args.scale then return args.scale end
 	local dim, units, scale
@@ Line 154: / Line 134: @@
 	end
 	return scale
 end
@@ Line 159: / Line 163: @@
     args = cleanArgs(args)
 	args.viewport_px = args.viewport_px or 200 --- viewport for Kartographer is 200px high
-	local scale = p._scale(args)
+	local scale = computeScale(args)
 	if scale then
 		local zoom = geohackScaleToMapZoom(scale)