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Allows traversing the spatialhash with a ray
This commit is contained in:
Ignazio Setti
parent
eac8874ef9
commit
d34709c426
225
spatialhash.lua
225
spatialhash.lua
@ -29,141 +29,178 @@ local min, max = math.min, math.max
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local _PACKAGE, common_local = (...):match("^(.+)%.[^%.]+"), common
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if not (type(common) == 'table' and common.class and common.instance) then
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assert(common_class ~= false, 'No class commons specification available.')
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require(_PACKAGE .. '.class')
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common_local, common = common, common_local
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assert(common_class ~= false, 'No class commons specification available.')
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require(_PACKAGE .. '.class')
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common_local, common = common, common_local
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end
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local Spatialhash = {}
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function Spatialhash:init(cell_size)
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self.cell_size = cell_size or 100
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self.cells = {}
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self.cell_size = cell_size or 100
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self.cells = {}
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end
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function Spatialhash:cellCoords(x,y)
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return floor(x / self.cell_size), floor(y / self.cell_size)
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return floor(x / self.cell_size), floor(y / self.cell_size)
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end
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function Spatialhash:cell(i,k)
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local row = rawget(self.cells, i)
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if not row then
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row = {}
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rawset(self.cells, i, row)
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end
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local row = rawget(self.cells, i)
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if not row then
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row = {}
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rawset(self.cells, i, row)
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end
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local cell = rawget(row, k)
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if not cell then
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cell = setmetatable({}, {__mode = "kv"})
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rawset(row, k, cell)
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end
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local cell = rawget(row, k)
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if not cell then
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cell = setmetatable({}, {__mode = "kv"})
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rawset(row, k, cell)
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end
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return cell
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return cell
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end
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function Spatialhash:cellAt(x,y)
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return self:cell(self:cellCoords(x,y))
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return self:cell(self:cellCoords(x,y))
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end
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-- get all shapes
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function Spatialhash:shapes()
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local set = {}
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for i,row in pairs(self.cells) do
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for k,cell in pairs(row) do
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for obj in pairs(cell) do
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rawset(set, obj, obj)
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end
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end
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end
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return set
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local set = {}
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for i,row in pairs(self.cells) do
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for k,cell in pairs(row) do
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for obj in pairs(cell) do
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rawset(set, obj, obj)
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end
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end
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end
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return set
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end
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-- get all shapes that are in the same cells as the bbox x1,y1 '--. x2,y2
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function Spatialhash:inSameCells(x1,y1, x2,y2)
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local set = {}
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x1, y1 = self:cellCoords(x1, y1)
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x2, y2 = self:cellCoords(x2, y2)
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for i = x1,x2 do
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for k = y1,y2 do
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for obj in pairs(self:cell(i,k)) do
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rawset(set, obj, obj)
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end
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end
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end
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return set
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local set = {}
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x1, y1 = self:cellCoords(x1, y1)
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x2, y2 = self:cellCoords(x2, y2)
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for i = x1,x2 do
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for k = y1,y2 do
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for obj in pairs(self:cell(i,k)) do
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rawset(set, obj, obj)
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end
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end
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end
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return set
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end
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function Spatialhash:register(obj, x1, y1, x2, y2)
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x1, y1 = self:cellCoords(x1, y1)
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x2, y2 = self:cellCoords(x2, y2)
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for i = x1,x2 do
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for k = y1,y2 do
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rawset(self:cell(i,k), obj, obj)
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end
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end
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x1, y1 = self:cellCoords(x1, y1)
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x2, y2 = self:cellCoords(x2, y2)
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for i = x1,x2 do
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for k = y1,y2 do
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rawset(self:cell(i,k), obj, obj)
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end
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end
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end
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function Spatialhash:remove(obj, x1, y1, x2,y2)
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-- no bbox given. => must check all cells
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if not (x1 and y1 and x2 and y2) then
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for _,row in pairs(self.cells) do
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for _,cell in pairs(row) do
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rawset(cell, obj, nil)
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end
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end
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return
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end
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-- no bbox given. => must check all cells
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if not (x1 and y1 and x2 and y2) then
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for _,row in pairs(self.cells) do
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for _,cell in pairs(row) do
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rawset(cell, obj, nil)
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end
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end
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return
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end
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-- else: remove only from bbox
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x1,y1 = self:cellCoords(x1,y1)
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x2,y2 = self:cellCoords(x2,y2)
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for i = x1,x2 do
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for k = y1,y2 do
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rawset(self:cell(i,k), obj, nil)
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end
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end
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-- else: remove only from bbox
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x1,y1 = self:cellCoords(x1,y1)
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x2,y2 = self:cellCoords(x2,y2)
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for i = x1,x2 do
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for k = y1,y2 do
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rawset(self:cell(i,k), obj, nil)
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end
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end
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end
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-- update an objects position
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function Spatialhash:update(obj, old_x1,old_y1, old_x2,old_y2, new_x1,new_y1, new_x2,new_y2)
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old_x1, old_y1 = self:cellCoords(old_x1, old_y1)
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old_x2, old_y2 = self:cellCoords(old_x2, old_y2)
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old_x1, old_y1 = self:cellCoords(old_x1, old_y1)
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old_x2, old_y2 = self:cellCoords(old_x2, old_y2)
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new_x1, new_y1 = self:cellCoords(new_x1, new_y1)
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new_x2, new_y2 = self:cellCoords(new_x2, new_y2)
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new_x1, new_y1 = self:cellCoords(new_x1, new_y1)
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new_x2, new_y2 = self:cellCoords(new_x2, new_y2)
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if old_x1 == new_x1 and old_y1 == new_y1 and
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old_x2 == new_x2 and old_y2 == new_y2 then
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return
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end
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if old_x1 == new_x1 and old_y1 == new_y1 and
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old_x2 == new_x2 and old_y2 == new_y2 then
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return
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end
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for i = old_x1,old_x2 do
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for k = old_y1,old_y2 do
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rawset(self:cell(i,k), obj, nil)
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end
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end
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for i = new_x1,new_x2 do
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for k = new_y1,new_y2 do
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rawset(self:cell(i,k), obj, obj)
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end
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end
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for i = old_x1,old_x2 do
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for k = old_y1,old_y2 do
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rawset(self:cell(i,k), obj, nil)
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end
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end
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for i = new_x1,new_x2 do
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for k = new_y1,new_y2 do
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rawset(self:cell(i,k), obj, obj)
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end
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end
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end
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function Spatialhash:intersectionsWithSegment(x1, y1, x2, y2)
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local odx, ody = x2 - x1, y2 - y1
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local len, cur = vector.len(odx, ody), 0
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local dx, dy = vector.normalize(odx, ody)
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local step = self.cell_size / 2
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local visited = {}
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local points = {}
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local mt = math.huge
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while (cur + step < len) do
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local cx, cy = x1 + dx * cur, y1 + dy * cur
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local shapes = self:cellAt(cx, cy)
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cur = cur + step
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for _, shape in pairs(shapes) do
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if (not visited[shape]) then
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local ints = shape:intersectionsWithRay(x1, y1, dx, dy)
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for _, t in ipairs(ints) do
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if (t >= 0 and t <= len) then
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local px, py = vector.add(x1, y1, vector.mul(t, dx, dy))
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table.insert(points, {shape, t, px, py})
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end
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end
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visited[shape] = true
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end
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end
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end
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table.sort(points, function(a, b)
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return a[2] < b[2]
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end)
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return points
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end
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function Spatialhash:draw(how, show_empty, print_key)
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if show_empty == nil then show_empty = true end
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for k1,v in pairs(self.cells) do
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for k2,cell in pairs(v) do
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local is_empty = (next(cell) == nil)
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if show_empty or not is_empty then
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local x = k1 * self.cell_size
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local y = k2 * self.cell_size
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love.graphics.rectangle(how or 'line', x,y, self.cell_size, self.cell_size)
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if show_empty == nil then show_empty = true end
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for k1,v in pairs(self.cells) do
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for k2,cell in pairs(v) do
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local is_empty = (next(cell) == nil)
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if show_empty or not is_empty then
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local x = k1 * self.cell_size
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local y = k2 * self.cell_size
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love.graphics.rectangle(how or 'line', x,y, self.cell_size, self.cell_size)
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if print_key then
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love.graphics.print(("%d:%d"):format(k1,k2), x+3,y+3)
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end
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end
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end
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end
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if print_key then
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love.graphics.print(("%d:%d"):format(k1,k2), x+3,y+3)
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end
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end
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end
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end
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end
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return common_local.class('Spatialhash', Spatialhash)
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