I solved it with an app called 'QuickMacro' - "com.cyjh.mobileanjian", which can write script like this:
Delay 5000- TickCount()
TouchDownEvent 532,1816,0
Delay 1800000- TickCount()
TouchMoveEvent 850,1400,0,9
Delay 500- TickCount()
TouchUpEvent 0
Hope Macrodroid can have these 'TouchDown'...