dcearth/cities.lua

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Lua
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--Load and save the fixed width plaintext data used by DEFCON.
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local t = {}
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local io = io
local math = math
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local table = table
local tonumber = tonumber
local lfs = love.filesystem
local lg = love.graphics
local locationQuery = require 'locationQuery'
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local cities
local points = {}
local caps = {}
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t.selected = nil
t.selectionLocked = false
function t.lockSelection()
t.selectionLocked = true
end
function t.unlockSelection()
t.selectionLocked = false
end
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function t.draw()
return lg.points( points )
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end
function t.drawSelected( )
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local c = t.selected
if not c then return end
lg.circle( "line", c.x, c.y, 1.0 )
end
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function t.drawCapitals()
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if cities.visible then lg.points( caps ) end
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end
function t.selectNearest( cities, x, y )
return cities:getClosestPoint(x, y) --defer to locationQuery
end
local city = {}
local citymt = {__index = city}
function city:formatDisplayInfo()
return (
[[
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NAME: %s
COUNTRY: %s
LONGITUDE: %3.2f
LATITUDE: %3.2f
POP: %d
CAPITAL: %s]]):format( self.name, self.country, self.x, self.y, self.pop, tostring(self.capital) )
end
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function t.load( filename )
print( "=== LOADING CITIES. ===" )
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cities = { visible = true, active = false, filename = filename }
local n = 1
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local idxPts = 1
local idxCaps = 1
points = {}
caps = {}
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for line in assert( lfs.lines( filename ), "Error: could not open cities.dat" ) do
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local _, _, x, y, pop, capital = line:sub( 83 ):find( "(%g+)%s+(%g+)%s+(%g+)%s+(%g+)" )
if capital then --check against empty or malformed line
x, y, pop, capital = tonumber( x ), tonumber( y ), tonumber( pop ), ( tonumber( capital ) > 0)
local city = setmetatable({
name = line:sub( 1, 39 ):gsub("%s+$",""),
country = line:sub( 42, 82 ):gsub("%s+$",""),
x = x, y = y, pop = pop, capital = capital
}, citymt )
cities[n] = city
n = n + 1
points[idxPts], points[idxPts + 1] = x, y
idxPts = idxPts + 2
if capital then
caps[idxCaps], caps[idxCaps + 1] = x, y
idxCaps = idxCaps + 2
end
else
print( "CITIES: malformed line:", line )
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end
end
--Multiple inheritance.
cities = locationQuery.New( cities )
setmetatable( getmetatable( cities ).__index, {__index = t } )
print( "=== CITIES LOADED:", filename, n, "===" )
return cities
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end
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function t.save( cities )
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local str = {}
for n, city in ipairs( cities ) do
str[n] = ("%-41s%-41s%-14f%-14f%-19d %d"):format(
city.name, city.country, city.x, city.y, city.pop, city.capital and 1 or 0 )
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end
return assert(table.concat( str, "\n" ))
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end
return t