Step Detector

local scene = storyboard.newScene()

local mAbs = math.abs
local mSqrt = math.sqrt
local mFloor = math.floor
local tRemove = table.remove

function scene:createScene (event)
    local group = self.view
    self.steps = 0
    self.lastx = 0
    self.lasty = 0
    self.lastz = 0
    self.lastdiff = 0
    self.lastdot = 0
    self.delta = 0.3
end

function scene:accelerometer (event)
    local lastx, lasty, lastz, x, y, z = self.lastx, self.lasty, self.lastz, event.xInstant, event.yInstant, event.zInstant
    local dot = mAbs(lastx * x + lasty * y + lastz * z)
    local diff = self.lastdot - dot

    -- Условие опрделения тряски, self.delta - пороговое значение
    -- self.delta determines sensivity
    if mAbs(diff) > self.delta then
        if not self.lastStep then
            event.isStep = true
            self.lastStep = true
        end
    else
        self.lastStep = false
    end

    self.lastdot = dot
    self.lastdiff = diff
    self.lastx = x
    self.lasty = y
    self.lastz = z

    if event.isStep == true then
        -- Здесь идёт код, который должен выполнится на тряску
        -- Shake event code is here
        print('Shake it!')
    end
end

function scene:enterScene (event)
    system.setAccelerometerInterval(10)
    Runtime:addEventListener('accelerometer', self)
end

function scene:exitScene (event)
    Runtime:removeEventListener('accelerometer', self)
end

scene:addEventListener('createScene', scene)
scene:addEventListener('enterScene', scene)
scene:addEventListener('exitScene', scene)
return scene