Overlaying any control/indicator over an intensity chart updating in sweep mode makes the chart display blank!

[Khalil.Eslami]

When I overlay a control or indicator over my intensity chart which is updating in sweep mode, the chart display gets blank. However, when the control/indicator is not on the chart, the chart display is correct.

Attached file is an example VI including 2 charts (chart 1 without Boolean, chart 2 with Boolean). When I run it, the second chart is blank. If I change the position of the Boolean not to be overlaid on chart 2, it is not blank any more (like chart 1).

When I replace the chart with a new intensity chart, I don't see the issue. I might be related to a property of the chart that I could not realized. I have to use this chart with this appearance and I don't want to use a new chart. I would like to know where the issue is.

Do you know what the problem is and how I can fix it?

Thank you so much in advance.

[GerdW]

Hi Khalil,

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@Khalil.Eslami wrote:

When I replace the chart with a new intensity chart, I don't see the issue. I might be related to a property of the chart that I could not realized. I have to use this chart with this appearance and I don't want to use a new chart. I would like to know where the issue is.

Do you know what the problem is and how I can fix it?

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You already found the source of the problem: that specific intensity chart!

Replace that chart and configure it (again) as needed…

General suggestion: avoid overlapping indicators, especially with graphic-extensive ones like charts/graphs!

[altenbach · Accepted solution]

it's not a problem, but probably implemented as is due to careful performance considerations.

It is silly to use an intensity chart in sweep mode with the x-axis hidden. I recommend a plain intensity graph initialized with the display size and replacing data (rows) as you go. Much more lightweight and fully in-place.  Now even the control overlay works fine (If you really think you need that!)

If you really want to draw some arbitrary things (lines, circles, text, etc) over an intensity graph, use "plot images" overlay instead (not shown). (not possible on a chart!)

[Khalil.Eslami]

Thanks for the reply and your advise.