148 lines
3.7 KiB
Lua
148 lines
3.7 KiB
Lua
local t = {}
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local bmp = require 'bmp'
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local lg = assert( love.graphics )
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local colours = {
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africa = {1,0,0,0.5},
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europe = {0,1,0,0.5},
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northamerica = {0,0,1,0.5},
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russia = {0,1,1,0.5},
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southamerica = {1,0,1,0.5},
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southasia = {1,1,0,0.5},
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sailable = {1, 1, 1, 0.2},
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}
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function t.load( filename, name )
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local img, imgd = assert( bmp.load( filename ) )
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local territory = {
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visible = true,
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name = name,
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colour = colours[name],
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border = {},
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img = img,
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imgd = imgd
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}
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if name == "sailable" then
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t.sailable = territory
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t.computeBorder( territory, 20 / 255 )
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end
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return setmetatable( territory, {__index = t } )
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end
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--World space coordinate.
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local function ToWorld( x, y )
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return x * 360 / 512 - 180, y * 200 / 285 - 100
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end
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local function ToPixel( x, y )
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return (x + 180) * 512 / 360, 285 - ( y + 100 ) * 285 / 200
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end
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function t.isValid( x, y )
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end
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function t.getPixel( territory, x, y )
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--ZERO INDEXED
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local imgx, imgy = math.floor( 512 * ( x + 180 ) / 360 ), math.floor( 285 * ( y + 100 ) / 200 )
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--print( territory.name, imgx, imgy )
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return territory.imgd:getPixel( imgx, imgy )
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end
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function t.toggleVisibility( territory )
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end
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--[[
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0
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20 -- once sailable.bmp is brighter than this, the area is traversable by ships
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60 -- once sailable.bmp and territory.bmp are brighter than this, ships can be placed here
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130 -- if territory.bmp is brighter than this and sailable is darker than 60, structures are placeable.
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SO:
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SAILABLE: 0 (not), 21 (traverse not place), 61 ( traverse and place )
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TERRITORY: 131 ( place land if sailable <= 60 ), 61 ( place sea ), 0
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]]
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function t.isSailable( x, y )
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local water = assert( t.sailable )
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if water:getPixel( x, y ) > 20 / 255 then return true end
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return false
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end
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function t.canPlaceShip( territory, x, y )
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local water = assert( t.sailable )
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if water:getPixel( x, y ) > 60 / 255
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and territory:getPixel( x, y ) > 60 / 255 then return true end
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return false
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end
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function t.canPlaceLand( territory, x, y )
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local water = assert( t.sailable )
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if water:getPixel( x, y ) < 60 / 255
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and territory:getPixel( x, y ) > 130 / 255 then return true end
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return false
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end
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function t.draw( territory )
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lg.setColor( territory.colour )
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lg.draw( territory.img )
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end
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function t.drawBorder( territory )
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--lg.setColor( territory.colour )
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for _, poly in ipairs( territory.border ) do
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lg.line( poly )
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end
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end
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function t.computeBorder( territory, threshold )
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territory.border = {}
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local border = territory.border
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local n = 1
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for x = 0, 511 do
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for y = 0, 284 do
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--Bottom left, bottom right, and top right of pixel in image coordinates:
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local blx, bly = x, y + 1
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local brx, bry = x + 1, y + 1
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local trx, try = x + 1, y
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--Sample image and detect edge:
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local curValue = territory.imgd:getPixel( x, y )
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local leftValue = territory.imgd:getPixel( math.min( x + 1, 511 ), y )
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local downValue = territory.imgd:getPixel( x, math.min( 284, y + 1 ) )
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local isLeftEdge =
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((curValue >= threshold) and (leftValue < threshold)) or
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((curValue <= threshold) and (leftValue > threshold))
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local isDownEdge =
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((curValue >= threshold) and (downValue < threshold)) or
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((curValue <= threshold) and (downValue > threshold))
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if isLeftEdge then
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--print( "Left edge:", brx, bry, trx, try )
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border[n] = { brx, bry, trx, try }
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n = n + 1
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end
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if isDownEdge then
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--print( "Down edge:", blx, bly, brx, bry )
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border[n] = { blx, bly, brx, bry }
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n = n + 1
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end
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end
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end
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end
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function t.drawConnections( nodes )
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end
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function t.save( nodes, filename )
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end
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return t |