defer update panel

[Julien_31]

Oups, I have noticed that sometimes, the graph appears to be hidden after SetPlotAttribute function executes. So the behaviour is not always strictly the same...sometimes it's PlotY and sometimes it's SetPlotAttribute...

[Julien_31 · Accepted solution]

Maybe I have an idea, not very simple but it can be a solution...

I'm going to try using SetPlotAttribute with ATTR_PLOT_YDATA attribute...So, after getting a plot handle during first function call, I will have the possibility to replace plot Y data only for this plot handle (without changing any other attribute). I will need to declare some static variable inside UpdateGraph () function.

Does anybody have any other idea ?

[Julien_31]

My solution works and legend does not "blink" any more but...it's not a good idea. In terms of performance, it's lame ! So, if anybody has another suggestion, I would really appreciate it ! ^^

[Julien_31]

OK ! I kept my solution which made legend not blink. But there was something stupid in what I did : the number of points for each channels ! I plotted 1 second of data (2000 points) and needed to see only 40 ms, so I displayed only the 80 first points for each channel...but for each channel, 2000 points were "loaded" into the graph !

Instead of doing this stupid thing, I decided to plot directly 40 ms of data (80 points instead of 2000)...Now that's OK...

[Wolfgang]

Congratulations! Learning by doing is a time-consuming but sustainable method 😉

[Julien_31]

Yes indeed ! ^^ Thank you everybody for your help ! 

[LuisG]

Hi Julien,

I realize you've already resolved your problem, but I was curious about the fact that you saw the graph disappear when you plotted. I wouldn't expect that to happen. I tested the following snippet:

SetCtrlAttribute (panel, PANEL_GRAPH, ATTR_VISIBLE, 0);
PlotY (panel, PANEL_GRAPH, data, 100, VAL_DOUBLE, VAL_THIN_LINE, VAL_EMPTY_SQUARE, VAL_SOLID, 1, VAL_RED);
SetCtrlAttribute (panel, PANEL_GRAPH, ATTR_VISIBLE, 1);

... and for me, the graph never disappears, even if I single-step through the code, in the debugger. In other words, PlotY did not trigger a redraw event.

If you happen to have a code snippet for which the redraw does happen, would you mind posting here, so that I could check it?

Thanks,

Luis

[Julien_31]

Hi Luis,

My code was as follow...(this function was called in another thread, but I guess that it does not change anything)

/*========================================================================================*/
/* Update graph function                                                                                                                                                     */
/*========================================================================================*/
void UpdateGraph (float64 *acqData, CHNLCONFIG *chnlConfig)
{
 int plotIndex;
 int plotHdl;
 const int chnlColor[NB_CHANNELS] = {VAL_RED, VAL_GREEN, VAL_BLUE, VAL_DK_RED, VAL_DK_GREEN, VAL_DK_BLUE};
 const char *chnlName[NB_CHANNELS] = {"U1", "U2", "U3", "I1", "I2", "I3"};
 const int chnlAxis[NB_CHANNELS] = {VAL_LEFT_YAXIS, VAL_LEFT_YAXIS, VAL_LEFT_YAXIS, VAL_RIGHT_YAXIS, VAL_RIGHT_YAXIS, VAL_RIGHT_YAXIS};
 
 // Make graph invisible
 SetCtrlAttribute (mesPanelHdl, TABMES_UIGRAPH, ATTR_VISIBLE, 0);
 
 // Delete graph
 DeleteGraphPlot (mesPanelHdl, TABMES_UIGRAPH, -1, VAL_DELAYED_DRAW);
 
 // For each plot...
 for (plotIndex = 0 ; plotIndex < NB_CHANNELS ; plotIndex++)
 {
      // If channel activated...
      if (chnlConfig[plotIndex].selected)
      {
           // Plot curve
           plotHdl = PlotY (mesPanelHdl, TABMES_UIGRAPH, acqData + plotIndex * RATE, RATE, VAL_DOUBLE, VAL_THIN_LINE, VAL_EMPTY_SQUARE, VAL_SOLID, 1, chnlColor[plotIndex]);
  
           // Set curve name
           SetPlotAttribute (mesPanelHdl, TABMES_UIGRAPH, plotHdl, ATTR_PLOT_LG_TEXT, chnlName[plotIndex]);
  
           // Set curve axis
           SetPlotAttribute (mesPanelHdl, TABMES_UIGRAPH, plotHdl, ATTR_PLOT_YAXIS, chnlAxis[plotIndex]);
      }
 }
 
 // Make graph visible
 SetCtrlAttribute (mesPanelHdl, TABMES_UIGRAPH, ATTR_VISIBLE, 1);

[LuisG]

Thanks, Julien.

I have a couple more questions:

1. Does this graph have any cursors in VAL_SNAP_TO_POINT mode?

2. Is chnlAxis[plotIndex] = VAL_RIGHT_YAXIS for any of your plots?

Thanks,

Luis

[Julien_31]

Hi Luis,

1. Does this graph have any cursors in VAL_SNAP_TO_POINT mode? => NO

2. Is chnlAxis[plotIndex] = VAL_RIGHT_YAXIS for any of your plots? => NO (there are 6 plots : VAL_LEFT_YAXIS for plots 1 to 3, and VAL_RIGHT_YAXIS for plots 4 to 6)

Any idea ? 🙂