Good Evening.

i need an help. i have write this sample code to understand how many time Prorealtime platform call my indicator and how platform manage screen and drawing.

defparam drawonlastbaronly = true

MyTime =  Time
MySecond = MyTime mod 100

if islastbarupdate then
 
  for i = 1 to 50
    if MySecond mod 2 = 0 then
      drawtext("A#i#", barindex-i,1.1743)
    else
      drawtext("B#i#", barindex-i,1.1741)
    endif
   next

endif

return

code is very simple. it draw only on the last bar call, and if the last bar closing second is even or odd it draw text A or B.

when i run the indicator, i see on the screen apper line A, then text disappear then appear text line B and so on.

this i a video i record that explain.

http://www.mediafire.com/file/4n4zqz2ld1xfiqe/2020-10-13_23-38-06.mkv/file

i deduce that platform call my indicator for every new price, and within these call platform does nested call for each bar.

but i deduce also that platform clear screen for every new call associated with new price, otherwise I would have seen both lines of text remain on the screen, both A and B.

Instead, if line A appears, the B disappears and vice versa, so it means that the screen is cleared before every new call.

Do you know a way for the screen not to be blanked, at least for a certain indicator, so that what was previously drawn can be left on the screen?

If i have an indicator that calcuate a value for yesterday and plot it on the screen, that value will be ok forever and i wont’ to recalculate for every price in the future, wasting cpu.

Or i will have the chance to decide if clear past value or leave on the screen.