mirror of
https://github.com/kepler155c/opus
synced 2024-11-15 05:04:50 +00:00
102 lines
2.8 KiB
Lua
102 lines
2.8 KiB
Lua
--- The Grid class.
|
|
-- Implementation of the `grid` class.
|
|
-- The `grid` is a implicit graph which represents the 2D
|
|
-- world map layout on which the `pathfinder` object will run.
|
|
-- During a search, the `pathfinder` object needs to save some critical values.
|
|
-- These values are cached within each `node`
|
|
-- object, and the whole set of nodes are tight inside the `grid` object itself.
|
|
|
|
if (...) then
|
|
|
|
-- Dependencies
|
|
local _PATH = (...):gsub('%.grid$','')
|
|
|
|
-- Local references
|
|
local Utils = require (_PATH .. '.core.utils')
|
|
local Node = require (_PATH .. '.core.node')
|
|
|
|
-- Local references
|
|
local setmetatable = setmetatable
|
|
|
|
-- Offsets for straights moves
|
|
local straightOffsets = {
|
|
{x = 1, y = 0, z = 0} --[[W]], {x = -1, y = 0, z = 0}, --[[E]]
|
|
{x = 0, y = 1, z = 0} --[[S]], {x = 0, y = -1, z = 0}, --[[N]]
|
|
{x = 0, y = 0, z = 1} --[[U]], {x = 0, y = -0, z = -1}, --[[D]]
|
|
}
|
|
|
|
local Grid = {}
|
|
Grid.__index = Grid
|
|
|
|
function Grid:new(dim)
|
|
local newGrid = { }
|
|
newGrid._min_x, newGrid._max_x = dim.x, dim.ex
|
|
newGrid._min_y, newGrid._max_y = dim.y, dim.ey
|
|
newGrid._min_z, newGrid._max_z = dim.z, dim.ez
|
|
newGrid._nodes = { }
|
|
newGrid._width = (newGrid._max_x-newGrid._min_x)+1
|
|
newGrid._height = (newGrid._max_y-newGrid._min_y)+1
|
|
newGrid._length = (newGrid._max_z-newGrid._min_z)+1
|
|
return setmetatable(newGrid,Grid)
|
|
end
|
|
|
|
function Grid:isWalkableAt(x, y, z)
|
|
local node = self:getNodeAt(x,y,z)
|
|
return node and node.walkable ~= 1
|
|
end
|
|
|
|
function Grid:getWidth()
|
|
return self._width
|
|
end
|
|
|
|
function Grid:getHeight()
|
|
return self._height
|
|
end
|
|
|
|
function Grid:getNodes()
|
|
return self._nodes
|
|
end
|
|
|
|
function Grid:getBounds()
|
|
return self._min_x, self._min_y, self._min_z, self._max_x, self._max_y, self._max_z
|
|
end
|
|
|
|
--- Returns neighbours. The returned value is an array of __walkable__ nodes neighbouring a given `node`.
|
|
-- @treturn {node,...} an array of nodes neighbouring a given node
|
|
function Grid:getNeighbours(node)
|
|
local neighbours = {}
|
|
for i = 1,#straightOffsets do
|
|
local n = self:getNodeAt(
|
|
node.x + straightOffsets[i].x,
|
|
node.y + straightOffsets[i].y,
|
|
node.z + straightOffsets[i].z
|
|
)
|
|
if n and self:isWalkableAt(n.x, n.y, n.z) then
|
|
neighbours[#neighbours+1] = n
|
|
end
|
|
end
|
|
|
|
return neighbours
|
|
end
|
|
|
|
function Grid:getNodeAt(x,y,z)
|
|
if not x or not y or not z then return end
|
|
if Utils.outOfRange(x,self._min_x,self._max_x) then return end
|
|
if Utils.outOfRange(y,self._min_y,self._max_y) then return end
|
|
if Utils.outOfRange(z,self._min_z,self._max_z) then return end
|
|
|
|
-- inefficient
|
|
if not self._nodes[y] then self._nodes[y] = {} end
|
|
if not self._nodes[y][x] then self._nodes[y][x] = {} end
|
|
if not self._nodes[y][x][z] then self._nodes[y][x][z] = Node:new(x,y,z) end
|
|
return self._nodes[y][x][z]
|
|
end
|
|
|
|
return setmetatable(Grid,{
|
|
__call = function(self,...)
|
|
return self:new(...)
|
|
end
|
|
})
|
|
|
|
end
|