Problems with using Graph Controls

[chemph]

Hallo all,

I've some problems with programming graph controls in CVI. I'm measuring data with 10,000 Hz and write this data seperated by an semicolon into an *.txt file. After the Measurement, I want to visualize the data with an graph control. The problem is, when I read one Value from the File, CVI can not draw a "thin Line" so I have to use "connected point" what I want to avoid.
I thought I can take a hand full of data e.g. 50 samples and draw a graph with "thin line". This was the idea.
Here is my code:
while (stop == 0)
{
    for(count=0; count<50; count++)
    {
        end = fgets(puffer, 100, MESS_FILE);
   
        if (end == NULL)
        {
            stop = 1;
        }

       
        if (stop == 0)
        {
            pch = strtok (puffer, ";");
            graph_x[0] = atof(pch);
           
            pch = strtok(NULL, ";");
            graph_y_s[0] = atof(pch);
        }
    }
           
    PlotXY (handle_panel_graph, PANEL_PLOT_GRAPH_2, graph_x, graph_y_s, count-1, VAL_DOUBLE, VAL_DOUBLE, VAL_CONNECTED_POINTS,
            VAL_ASTERISK, VAL_SOLID, 1, VAL_RED);
       
}

How can I solve the problem on a better way?


Greets from germany

[Jerome30]

Maybe you can use  PlotWaveform...

[cdk52]

You could use the functions ArrayToFile() and FileToArray() (from the Formatting and I/O Library) to save and retrieve the data.

[dcl9000]

You should be able to plot thin line only with this:

PlotXY (handle_panel_graph, PANEL_PLOT_GRAPH_2, graph_x, graph_y_s, count-1,

            VAL_DOUBLE, VAL_DOUBLE, VAL_THIN_LINE,
            VAL_NO_POINT, VAL_SOLID, 1, VAL_RED);

[chemph]

Both, PlotWaveform and PlotXY works, but there is the next problem:

When reading always for example 10 data samples from file, I can Plot a waveform with 10 elements from x=0 to x=9, wen I read the next 10 samples, the waveform from x=10 to x=19 are plotted, but the points x=9 and x=10 (the last of first wave and first of second wave) are not connected. How can I do this?

[RobertoBozzolo]

In both case you could add a point before the first measure of the second plot, that is plot 11 points instead of 10, conveniently adjusting initial x field in case you are using PlotWaveform.