MATLAB: Problem with ginput when having 2 axes in the same figure

ginputtwo axes

I have a figure containing 2 axes, the first axes ax(1) contains a line object, it is a spectrum y = y(k). The x-axis here is inverse. The second axes ax(2) ('color','none') is just overlaid and does not contain any graphic object. It's x-axis on top is the (not reversed) wavelength.(The x-limits of the second are adjusted, so that both x-axis have the appropriate positions, e.g. k=0.1 –> x=10 stacked) However, this is to my knowledge the only way in MATLAB to achieve a second reverse x-axis for the same curve in a loglog diagram.

My problem: I want to get two x-coordinates in ax(1) by [x,~]=ginput(2); To be sure it is the right axes I use set(gcf,'CurrentAxes',ax(1))

Now, when I look at the resulting x values, they do come from ax(2), not from ax(1). I haven't any clue why this doesn't work.

Any help is much appreciated.

Best Answer

Answered by Walter:

"Try setting HitTest off for the second axis."

 set(ax(2),'HitTest','off')

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This enhancement has been incorporated in Release 2008a (R2008a). For previous product releases, read below for any possible workarounds:

The default behavior of the Data Cursor tool selects the axis on the right, since it is the 'CurrentAxes' (the one most recently drawn by the PLOTYY function. To get the data cursor to pick points from the curve on the left-hand axis, you can execute the following series of commands after the figure is plotted:

set(gcf,'currentaxes',AX(1)) % Make the axes on the left the current axes

set(AX(2),'hittest','off')          % turn off the HitTest property on the axis on the right
set(AX(1),'hittest','on')           % Turn on HitTest for the appropriate axis

Now the data cursor will only pick points on the curve from the axis on the left side of the plot. To switch back, execute the following code:

set(gcf,'currentaxes',AX(2)) % Make the axes on the left the current axes
set(AX(1),'hittest','off')          % turn off the HitTestproperty on the axis on the right
set(AX(2),'hittest','on')           % Turn on HitTest for the appropriate axis

Best Answer

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