[amibroker] Detecting TimeFrame limits

["Herman van den Bergen" <psytek@xxxxxxxx>]

This ought to be simple... how do i detect Timeframe limits on a tick chart?
I create a 3-minute overlay on tick charts and need a signal to tell me
where the three minute time frame starts and stop. How would i add 3-min
markers (vertical lines) to this code?

Thanks!
herman

Plot(C,"",1,128);
TimeFrameSet(3*60);
O3min = O;
H3min = H;
L3min = L;
C3min = C;
TimeFrameRestore();
O3 = TimeFrameExpand(O3min,3*60);
H3 = TimeFrameExpand(H3Min,3*60,expandFirst);
L3 = TimeFrameExpand(L3Min,3*60,expandFirst);
C3 = TimeFrameExpand(C3Min,3*60,expandFirst);
Plot(H3,"",5,styleStaircase);
Plot(L3,"",4,styleStaircase);




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