Snap to point cursor: How do I determine which axes?

[kirkm]

I have a graph displaying multiple plots.
Some of the plots use the lower-x and left-y axes.
Others use the upper-x and right-y axes.

I use a cursor in snap-to-point mode to select a data point on the plot and display an annotation that indicates the x and y value of the selected point.

How do I determine which pair of xy axes are associated with the plot the cursor has snapped to?

If I knew this I could use SetCursorAttribute(....) to set ATTR_CURSOR_XAXIS and ATTR_CURSOR_XAXIS to the appropriate value.

Thanks,
Kirk
Using Labwindows/CVI 2009

[RobertoBozzolo · Accepted solution]

You can obtain this by using:

GetGraphCursorIndex (panelHandle, controlID, cursorID, &plothandle, &index);
GetPlotAttribute (panelHandle, controlID, plotHandle, ATTR_PLOT_XAXIS, &axis);

You can compare 'axis' variable value with VAL_BOTTOM_XAXIS and VAL_TOP_XAXIS constants to determine X-axis of the plot.

The corresponding ATTR_PLOT_YAXIS attribute and VAL_RIGHT_YAXIS, VAL_LEFT_YAXIS constants help you determining the Y axis to which the plot is associated.

[kirkm]

Roberto,

I did not notice that GetGraphCursorIndex(...) returns the plot handle.

That solved my problem nicely!

Thank you for you're helpful suggestion, much appreciated.

Kirk