How can I update single plot in multi plot xy graph?

Hi all,
I'm working on an HMI "front" for a larger acquisition/analysis system, that includes continuous performance monitoring of a turbine. The results of the measurements are stored arrays of contour lines, that represents turbine efficiency and guide vane openings. This analysis is all performed in the background. In the HMI, the performance data is loaded from file when the specific "report" is requested, and is plotted in an XY graph. I would like to indicate the current operation point of the machine by using a plot that is a single point. Thus, that point's position among the contour lines indicates the current performance of the turbine. This point is updated once every second, while the performance data remains the same for considerable amounts of time between recalculations (days to weeks).
Is there any way of updating the value of a single plot in a multiple plot XY Graph without having to redraw all the plots?
I've tried using the "Active Plot" property, which doesn't work.
My current solution is to keep all the data as input to the executing while loop and replace a subset of the plot array, but that of course requires the entire rewrite every time the operation point plot is updated.
Best regards,
Jarle Ekanger, MSc, CLD
Flow Design Bureau AS
Solved!
Go to Solution.

You cannot redraw a single plot. If you want to update a single plot, you need to retain all plots in a shift regsiter and replace the data of the desired plot. However, your problem seems much simpler than that. To show a single point on a nearly static plot you have several options.
You can use a cursor that is controlled programmatically (the style can be a point, don't allow drag).
You can use annotations.
You can use the "plot images" feature that allows you to use image commands to draw anything on top of a graph.
None of these ideas require a redraw of any data.
I think the cursor idea is probably the easiest and most appropriate. Just use a property node with the following properties:
active cursor
cursor position x
cursor position y
LabVIEW Champion . Do more with less code and in less time .

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Most of the times this text won't get populated
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The Form :
/:PERFORM CDE_CENT IN PROGRAM ZKRPMM_PERFORM_Z1MEDRUCK
/:USING &EKKO-EBELN&
/:CHANGING &CDECENT&
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REPORT zkrpmm_perform_z1medruck .
DATA : BEGIN OF it_input_table OCCURS 10.
INCLUDE STRUCTURE itcsy.
DATA : END OF it_input_table.
déclaration de la table output_table contenant les
variables exportées
DATA : BEGIN OF it_output_table OCCURS 0.
INCLUDE STRUCTURE itcsy.
DATA : END OF it_output_table.
DATA : w_ebeln LIKE ekko-ebeln,
w_vbeln LIKE vbak-vbeln,
w_zcdffa LIKE vbak-zcdffa.
FORM CDE_CENT
FORM cde_cent TABLES input output.
it_input_table[] = input[].
it_output_table[] = output[].
READ TABLE it_input_table INDEX 1.
MOVE it_input_table-value TO w_ebeln.
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_INPUT'
EXPORTING
input = w_ebeln
IMPORTING
output = w_ebeln.
SELECT SINGLE zcdffa FROM ekko
INTO w_zcdffa
WHERE ebeln = w_ebeln.
it_output_table-name = 'CDECENT'.
MOVE w_zcdffa TO it_output_table-value.
MODIFY it_output_table INDEX 1.
output[] = it_output_table[].
ENDFORM.
/: PERFORM
/: USING &INVAR1&
/: USING &INVAR2&
/: CHANGING &OUTVAR1&
/: CHANGING &OUTVAR2&
/: ENDPERFORM
INVAR1 and INVAR2 are variable symbols and may be of any of the four SAPscript symbol types.
OUTVAR1 and OUTVAR2 are local text symbols and must therefore be character strings.
Example:
In script form
/: PERFORM READ_TEXTS IN PROGRAM 'Z08M1_FORM_EKFORM1'
/: USING &EKKO-EKORG&
/: USING &EKPO-WERKS&
/: USING &EKKO-EKGRP&
/: USING &EKKO-BSTYP&
/: CHANGING &COMPNAME&
/: CHANGING &SENDADR&
/: CHANGING &INVCADR&
/: CHANGING &COMPADR&
/: CHANGING &COVERLTR&
/: CHANGING &SHIPADR&
/: CHANGING &REMINDER&
/: CHANGING &REJECTION&
/: CHANGING &POSTADR&
/: CHANGING &LOGO&
/: ENDPERFORM
In program
FORM Read_texts - To extract the standard texts from the table *
FORM READ_TEXTS TABLES IN_PAR STRUCTURE ITCSY
OUT_PAR STRUCTURE ITCSY.
DATA : L_EKORG TYPE EKORG,
L_WERKS TYPE WERKS_D,
L_BSTYP TYPE BSTYP,
L_EKGRP TYPE BKGRP.
READ TABLE IN_PAR WITH KEY 'EKKO-EKORG' .
CHECK SY-SUBRC = 0.
L_EKORG = IN_PAR-VALUE.
READ TABLE IN_PAR WITH KEY 'EKPO-WERKS' .
CHECK SY-SUBRC = 0.
L_WERKS = IN_PAR-VALUE.
READ TABLE IN_PAR WITH KEY 'EKKO-EKGRP' .
CHECK SY-SUBRC = 0.
L_EKGRP = IN_PAR-VALUE.
READ TABLE IN_PAR WITH KEY 'EKKO-BSTYP' .
CHECK SY-SUBRC = 0.
L_BSTYP = IN_PAR-VALUE.
CLEAR Z08M1_ORG_TEXTS.
SELECT SINGLE * FROM Z08M1_ORG_TEXTS WHERE EKORG = L_EKORG
AND WERKS = L_WERKS
AND EKGRP = L_EKGRP
AND BSTYP = L_BSTYP.
IF SY-SUBRC NE 0.
SELECT SINGLE * FROM Z08M1_ORG_TEXTS WHERE EKORG = L_EKORG
AND WERKS = L_WERKS
AND EKGRP = L_EKGRP
AND BSTYP = SPACE.
ENDIF.
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OUT_PAR-VALUE = Z08M1_ORG_TEXTS-TXT_COMP.
MODIFY OUT_PAR INDEX SY-TABIX.
READ TABLE OUT_PAR WITH KEY 'SENDADR'.
OUT_PAR-VALUE = Z08M1_ORG_TEXTS-TXT_ADRS.
MODIFY OUT_PAR INDEX SY-TABIX.
READ TABLE OUT_PAR WITH KEY 'INVCADR'.
OUT_PAR-VALUE = Z08M1_ORG_TEXTS-TXT_INVC.
MODIFY OUT_PAR INDEX SY-TABIX.
READ TABLE OUT_PAR WITH KEY 'COMPADR'.
OUT_PAR-VALUE = Z08M1_ORG_TEXTS-TXT_CPAD.
MODIFY OUT_PAR INDEX SY-TABIX.
READ TABLE OUT_PAR WITH KEY 'COVERLTR'.
OUT_PAR-VALUE = Z08M1_ORG_TEXTS-TXT_COVR.
MODIFY OUT_PAR INDEX SY-TABIX.
READ TABLE OUT_PAR WITH KEY 'SHIPADR'.
OUT_PAR-VALUE = Z08M1_ORG_TEXTS-TXT_SHIP.
MODIFY OUT_PAR INDEX SY-TABIX.
READ TABLE OUT_PAR WITH KEY 'REMINDER'.
OUT_PAR-VALUE = Z08M1_ORG_TEXTS-TXT_RMDR.
MODIFY OUT_PAR INDEX SY-TABIX.
READ TABLE OUT_PAR WITH KEY 'REJECTION'.
OUT_PAR-VALUE = Z08M1_ORG_TEXTS-TXT_RJCT.
MODIFY OUT_PAR INDEX SY-TABIX.
READ TABLE OUT_PAR WITH KEY 'POSTADR'.
OUT_PAR-VALUE = Z08M1_ORG_TEXTS-TXT_POST.
MODIFY OUT_PAR INDEX SY-TABIX.
READ TABLE OUT_PAR WITH KEY 'LOGO'.
OUT_PAR-VALUE = Z08M1_ORG_TEXTS-TXT_LOGO.
MODIFY OUT_PAR INDEX SY-TABIX.
ENDFORM.
REPORT ZMPO1 .
form get_freight tables in_par structure itcsy out_par structure itcsy.
tables: ekko,konv,t685t.
data: begin of itab occurs 0,
         ebeln like ekko-ebeln,
         knumv like ekko-knumv,
       end of itab.
data: begin of itab1 occurs 0,
         knumv like konv-knumv,
         kposn like konv-kposn,
         kschl like konv-kschl,
         kbetr like konv-kbetr,
         waers like konv-waers,
         kwert like konv-kwert,
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data: begin of iout occurs 0,
         kschl like konv-kschl,
         vtext like t685t-vtext,
         kbetr like konv-kbetr,
         kwert like konv-kwert,
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data v_po like ekko-ebeln.
read table in_par with key 'EKKO-EBELN'.
if sy-subrc = 0.
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     ebeln
     knumv
from ekko
into table itab
where ebeln = v_po.
if sy-subrc = 0.
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        kposn
        kschl
        kbetr
        waers
        kwert
      into table itab1
      from konv
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        select single * from t685t
                          where kschl = itab1-kschl
                            and kappl = 'M'
                            and spras = 'EN'.
        iout-vtext = t685t-vtext.
        iout-kschl = itab1-kschl.
        iout-kbetr = itab1-kbetr.
        iout-kwert = itab1-kwert.
        append iout.
        clear iout.
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      if ( iout-kschl eq 'GSDC' OR
           iout-kschl eq 'GSFR' OR
           iout-kschl eq 'GSIR' ).
        at end of kschl.
          read table iout index sy-tabix.
          sum.
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      out_par-value = iout-vtext.
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      out_par-name = 'A2'.
      out_par-value = iout-kwert.
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          endat.
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      endloop.
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endif.
endform.
IN THE FORM I AM WRITING THIS CODE.
/:DEFINE &A1& = ' '
/:DEFINE &A2& = ' '
/:PERFORM GET_FREIGHT IN PROGRAM ZMFORM_PO1
/:USING &EKKO-EBELN&
/:CHANGING &A1&
/:CHANGING &A2&
/:ENDPERFORM
&A1&
&A2&
This Code is to be written in the PO form under ADDRESS window.
/:DEFINE &A1& = ' '
/:DEFINE &A2& = ' '
/:DEFINE &A3& = ' '
/:DEFINE &A4& = ' '
/:DEFINE &A5& = ' '
/:DEFINE &A6& = ' '
/:PERFORM GET_VENDOR IN PROGRAM ZMFORM_PO
/:USING &EKKO-EBELN&
/:CHANGING &A1&
/:CHANGING &A2&
/:CHANGING &A3&
/:CHANGING &A4&
/:CHANGING &A5&
/:CHANGING &A6&
/:ENDPERFORM
&A1&
&A2&
&A3&
&A4&
&A5&
&A6&
Regards
Anji

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