timeutils.txt

--@name timeutils
--@author katsu
--@shared
timeutils = {}

function timeutils.newDTtween()
    local savedTime = timer.systime()
    local firstExecAfterCompleted = true
    
    return function(length,delay,func)
        if func == nil then
            func = delay
            delay = 0
        end
        
        local time = timer.systime()

        local beforeDelayDT = time - savedTime
        local DT = beforeDelayDT - delay
        
        if beforeDelayDT >= delay then
            if DT <= length then
                local up = DT/length
                func(up)
                return false
            else
                if firstExecAfterCompleted then
                    func(1) --incase this function is ever tick divided
                    firstExecAfterCompleted = false
                end
                return true
            end
        end
    end
end

function timeutils.newEdgeTrigger()
    local savedTime = timer.systime()

    local risingFuncCalled = false
    local fallingFuncCalled = false
    return function(length,delay,risingEdgeFunc,fallingEdgeFunc)  
        if fallingEdgeFunc == nil then
            fallingEdgeFunc = risingEdgeFunc
            risingEdgeFunc = delay
            delay = 0
        end
        
        local time = timer.systime()
        
        local beforeDelayDT = time - savedTime
        local DT = beforeDelayDT - delay
        
        if beforeDelayDT >= delay then
            if DT <= length then
                if not risingFuncCalled and risingEdgeFunc ~= nil then
                    risingEdgeFunc()
                    risingFuncCalled = true
                end
                return false
            else
                if not fallingFuncCalled and fallingEdgeFunc ~= nil then
                    fallingEdgeFunc()
                    fallingFuncCalled = true
                end
                return true
            end
        end
    end
end

function timeutils.newTickDivider()
    local savedTime = timer.systime()
    return function(length,func)
        local time = timer.systime()
        local DT = time - savedTime
        
        if DT > length then
            func()
            savedTime = time
        end
    end
end