143 lines
4.5 KiB
Lua
Executable File
143 lines
4.5 KiB
Lua
Executable File
--[[
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Copyright (c) 2011 Matthias Richter
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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Except as contained in this notice, the name(s) of the above copyright holders
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shall not be used in advertising or otherwise to promote the sale, use or
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other dealings in this Software without prior written authorization.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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THE SOFTWARE.
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]]--
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local _NAME, common_local = ..., 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(_NAME .. '.class')
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end
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local Shapes = require(_NAME .. '.shapes')
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local Spatialhash = require(_NAME .. '.spatialhash')
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-- reset global table `common' (required by class commons)
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if common_local ~= common then
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common_local, common = common, common_local
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end
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local newPolygonShape = Shapes.newPolygonShape
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local newCircleShape = Shapes.newCircleShape
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local newPointShape = Shapes.newPointShape
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local HC = {}
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function HC:init(cell_size)
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self.hash = common_local.instance(Spatialhash, cell_size or 100)
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end
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-- spatial hash management
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function HC:resetHash(cell_size)
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local hash = self.hash
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self.hash = common_local.instance(Spatialhash, cell_size or 100)
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for shape in pairs(hash:shapes()) do
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self.hash:register(shape, shape:bbox())
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end
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return self
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end
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function HC:register(shape)
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self.hash:register(shape, shape:bbox())
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-- keep track of where/how big the shape is
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for _, f in ipairs({'move', 'rotate', 'scale'}) do
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local old_function = shape[f]
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shape[f] = function(this, ...)
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local x1,y1,x2,y2 = this:bbox()
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old_function(this, ...)
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self.hash:update(this, x1,y1,x2,y2, this:bbox())
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return this
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end
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end
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return shape
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end
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function HC:remove(shape)
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self.hash:remove(shape, shape:bbox())
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for _, f in ipairs({'move', 'rotate', 'scale'}) do
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shape[f] = function()
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error(f.."() called on a removed shape")
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end
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end
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return self
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end
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-- shape constructors
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function HC:polygon(...)
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return self:register(newPolygonShape(...))
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end
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function HC:rectangle(x,y,w,h)
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return self:polygon(x,y, x+w,y, x+w,y+h, x,y+h)
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end
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function HC:circle(x,y,r)
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return self:register(newCircleShape(x,y,r))
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end
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function HC:point(x,y)
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return self:register(newPointShape(x,y))
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end
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-- collision detection
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function HC:neighbors(shape)
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local neighbors = self.hash:inSameCells(shape:bbox())
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rawset(neighbors, shape, nil)
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return neighbors
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end
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function HC:collisions(shape)
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local candidates = self:neighbors(shape)
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for other in pairs(candidates) do
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local collides, dx, dy = shape:collidesWith(other)
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if collides then
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rawset(candidates, other, {dx,dy, x=dx, y=dy})
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else
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rawset(candidates, other, nil)
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end
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end
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return candidates
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end
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-- the class and the instance
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HC = common_local.class('HardonCollider', HC)
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local instance = common_local.instance(HC)
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-- the module
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return setmetatable({
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new = function(...) return common_local.instance(HC, ...) end,
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resetHash = function(...) return instance:resetHash(...) end,
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register = function(...) return instance:register(...) end,
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remove = function(...) return instance:remove(...) end,
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polygon = function(...) return instance:polygon(...) end,
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rectangle = function(...) return instance:rectangle(...) end,
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circle = function(...) return instance:circle(...) end,
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point = function(...) return instance:point(...) end,
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neighbors = function(...) return instance:neighbors(...) end,
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collisions = function(...) return instance:collisions(...) end,
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hash = function() return instance.hash end,
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}, {__call = function(_, ...) return common_local.instance(HC, ...) end})
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