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Iterators for active and neighboring shapes.

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This commit is contained in:
Matthias Richter 2012-03-05 10:26:14 +01:00
parent 87f964cb43
commit a7c65630ef
1 changed files with 12 additions and 6 deletions
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18
init.lua
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@ -112,9 +112,9 @@ local function new_shape(self, shape)
hash:update(self, {x=x1,y=y1}, {x=x2,y=y2}, {x=x3,y=y3}, {x=x4,y=y4})
end
function shape:_getNeighbors()
function shape:neighbors()
local x1,y1, x2,y2 = self:bbox()
return hash:getNeighbors(self, {x=x1,y=y1}, {x=x2,y=y2})
return pairs(hash:getNeighbors(self, {x=x1,y=y1}, {x=x2,y=y2}))
end
function shape:_removeFromHash()
@ -125,6 +125,14 @@ local function new_shape(self, shape)
return shape
end
function HC:activeShapes()
local next, t, k, v = next, self._active_shapes
return function()
k, v = next(t, k)
return v
end
end
function HC:addPolygon(...)
return new_shape(self, newPolygonShape(...))
end
@ -148,7 +156,6 @@ function HC:share_group(shape, other)
return false
end
-- get unique indentifier for an unordered pair of shapes, i.e.:
-- collision_id(s,t) = collision_id(t,s)
local function collision_id(self,s,t)
@ -161,9 +168,8 @@ end
function HC:update(dt)
-- collect colliding shapes
local tested, colliding = {}, {}
for _,shape in pairs(self._active_shapes) do
local neighbors = shape:_getNeighbors()
for _,other in pairs(neighbors) do
for shape in self:activeShapes() do
for other in shape:neighbors() do
local id = collision_id(self, shape,other)
if not tested[id] then
if not (self._ghost_shapes[other] or self:share_group(shape, other)) then