dcearth/nodes.lua

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Lua
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2023-04-28 17:35:52 +00:00
--Manage the pathfinding nodes used by DEFCON.
--This is important for a mapping tool because the DEFCON client will not load a map unless
--the pathfinding nodes form a connected graph.
local t = {}
local bmp = require 'bmp'
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local lg = assert( love.graphics )
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local isSailable
local function isConnected( startNode, endNode )
local ix, iy, fx, fy = startNode.x, startNode.y, endNode.x, endNode.y
if fx < -180 then fx = fx + 180 end
if fx > 180 then fx = fx - 180 end
local dx, dy = fx - ix, fy - iy
local mag = math.sqrt( dx * dx + dy * dy )
local n = 2 * math.floor( mag )
dx, dy = 0.5 * dx / mag, 0.5 * dy / mag
for i = 1, n do
ix, iy = ix + dx, iy + dy
if not( isSailable( ix, iy ) ) then return nil end
end
return true
end
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function t.getClosest( nodes, x, y )
local d = math.huge
local closestNode
for _, node in pairs( nodes.nodes ) do
local nx, ny = node.x, node.y
local nd = (nx - x) * (nx - x) + (ny - y) * (ny - y)
if nd < d then d = nd; closestNode = node end
end
return closestNode
end
function t.load( filename, sailable )
isSailable = sailable
local img, imgd = bmp.load( filename )
local nodes = { visible = true, nodes = {}, points = {}, connections = {}, img = img }
print( "=== Loading Nodes: ===" )
local n = 1
for x = 0, 799 do
for y = 0, 399 do
if imgd:getPixel( x, 399 - y ) > 0 then
local long = 360 * ( x - 800 ) / 800 - 360 / 2 + 360
local lat = 360 * ( 600 / 800 ) * ( 600 - y ) / 600 - 180
nodes.nodes[n] = {x = long, y = lat}
nodes.points[ 2 * n - 1 ] = long
nodes.points[ 2 * n ] = lat
print( n, long, lat )
n = n + 1
end
end
end
for i, srcNode in ipairs( nodes.nodes ) do
local adjacent = {}
for j, destNode in ipairs( nodes.nodes ) do
adjacent[j] = isConnected( srcNode, destNode )
end
nodes.connections[i] = adjacent
end
print( "=== Nodes Loaded ===" )
return setmetatable( nodes, {__index = t } )
end
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function t.isConnected( nodes )
end
function t.draw( nodes )
lg.setPointSize( 10 )
lg.setColor( 1, 1, 1, 0.5 )
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lg.points( nodes.points )
for i, connection in pairs( nodes.connections ) do
for j in pairs( connection ) do
local ix, iy, fx, fy = nodes.nodes[i].x, nodes.nodes[i].y, nodes.nodes[j].x, nodes.nodes[j].y
lg.line( ix, iy, fx, fy )
end
end
end
function t.drawConnections( nodes )
end
function t.save( nodes, filename )
end
return t