Chart axes assignment: performance difference between ATTR_ACTIVE_XAXIS and ATTR_PLOT_XAXIS
Hello
I use a graph xy with two x axes and the two axis of ordinates. There are two possibilities when you add a new record:
(1) PlotXY and SetPlotAttribute (, ATTR_PLOT_XAXIS,);
(2) SetCtrlAttribute (, ATTR_ACTIVE_XAXIS,) and PlotXY
I tend to prefer the second method, because I guess that it is slightly faster, but experts say?
Thank you!
Wolfgang,
At some point, there is always an active x axis, and so, even when you use method 1, it's really no different and no better than if you had done that:
SetCtrlAttribute
PlotXY
SetPlotAttribute
Whereas, with method 2, it is simply the next subset:
SetCtrlAttribute
PlotXY
What you need to know which changes the active axis using SetCtrlAttribute is mathematically trivial (it will affect only future locations, no current plots), while the change of the active axis of an existing field is not negligible: all data field must be remapped, and the plot needs to be redrawn, among other things.
Therefore, if you use method 1, it is really as if you were plotting twice: it draw you the first time with PlotXY against the person who is the active axis, and then you it draw a second time, when you call SetPlotAttribute, in case you are actually changing the axis of the plot and not just assigning the same axis.
There is no compromise here. Method 2 is much better.
Luis
Tags: NI Software
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