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https://github.com/vrld/hump.git
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92 lines
2.7 KiB
Lua
92 lines
2.7 KiB
Lua
--[[
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Copyright (c) 2010 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 functions = {}
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local function update(dt)
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local to_remove = {}
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for func, delay in pairs(functions) do
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delay = delay - dt
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if delay <= 0 then
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to_remove[#to_remove+1] = func
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end
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functions[func] = delay
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end
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for _,func in ipairs(to_remove) do
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functions[func] = nil
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func(func)
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end
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end
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local function add(delay, func)
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assert(type(func) == "function", "second argument needs to be a function")
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functions[func] = delay
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end
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local function addPeriodic(delay, func, count)
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assert(type(func) == "function", "second argument needs to be a function")
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local count = count or math.huge -- exploit below: math.huge - 1 = math.huge
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add(delay, function(f)
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if func(func) == false then return end
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count = count - 1
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if count > 0 then
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add(delay, f)
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end
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end)
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end
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local function clear()
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functions = {}
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end
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local function Interpolator(length, func)
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assert(type(func) == "function", "second argument needs to be a function")
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local t = 0
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return function(dt, ...)
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t = t + dt
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return t <= length and func((t-dt)/length, ...) or nil
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end
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end
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local function Oscillator(length, func)
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assert(type(func) == "function", "second argument needs to be a function")
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local t = 0
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return function(dt, ...)
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t = (t + dt) % length
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return func(t/length, ...)
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end
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end
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-- the module
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return {
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update = update,
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add = add,
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addPeriodic = addPeriodic,
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clear = clear,
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Interpolator = Interpolator,
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Oscillator = Oscillator
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}
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