Prevent cursor from changing the scale

[Mads]

There seems to be a difference in how the cursor affects the scales on XY-plots in LabVIEW 8.5 vs. 7.1.1: if a cursor is snapped to a plot and you move the cursor to a point that is outside the current scale it will change the Y scale. In my case the plot values go up and down all the time and off scale...but I want to be able to move the cursor sideways without any change on the scale.

One way to solve it is to turn off the cursor scrolling, however the problem then is that I really want to be able to scroll sideways with the cursors, I just do not want the cursors to automatically scroll while they track the plot they are snapped to. This was possible in 7.1.1 - even though you had cursor scrolling on the Y scale would not change like this unless you grabbed the cursor point yourself and dragged it along the Y scale. The way it works in LV 8.5 makes horisontal scrolling a nightmare because LV automatically starts adjusting the Y scale as well.

Now there has been a few changes to the cursor and plot properties since 7.1.1 so perhaps it is possible to get back the behaviour from 7.1.1 (i.e. scrolling ON - but with no automatic scrolling along the Y axis as you scroll along X) ?

Ideally in this case I would prevent scrolling along the Y axis alltogether (not even manually by dragging the cursor vertically), but allow it along the X axis...that feature is probably one for the wish list though...(?).

[Wiebe@CARYA]

I didn't verify anything of the stuff you've mentioned, but a
solution/workaround might be this.

In 8, you have a scale change event. So, if you drag the cursor and the
scale changes, you can set the y-scale back to it's original values. It's
not ideal, but it might help.

Regards,

Wiebe.

[Mads]

Hi Wiebe,

The change in behaviour is there, no doubt about that. It's not the easiest thing to recreate though (same plot and cursor and scale settings, a suitable plot, same cursor movement etc.), and to get around it is simple enough, but it is always annoying (and risky) when the default behaviour is changed...

I did not use the scale change, but made my own scrolling function based on the cursor move event. I've turned off the cursor scrolling option to avoid the Y-rescaling, and change the X-scale range if a cursor is moved off scale.