>   We need a simple way of zeroing online spectra, using the roody viewer to
> select which spectra are to be zeroed.

Problem confirmed: there is a button for "clear all", but no buttons for "clear
selected histograms" and "clear just this one histogram". It was suggested that the
right-click context menu for each histogram should have a "clear" action. Maybe same
for a "group".

>    We would also like the histogram view to be unaffected by refreshing. 
> Currently the y axis is autoscaled after a refresh.

I thought this was fixed a long time ago...

>   We would also like a quicker way of manipulating the histogram display, than
> by the awkward, particularly for canvases containing multiple histograms, axis
> manipulation currently available.

I am thinking along the lines of locking the "zooming" of all histograms: on a 2x2
panel of histograms, rezooming any one of them would rezoom the others the same way.

> This could be a toolbar similar to the view
> editor that already exists - are the contents of this customisable, or would a
> separate toolbar be needed?, and would ideally contain the following ...
>    4 buttons, which could each be labelled with a single arrow, for shifting the
> histogram left/right/up/down (e.g. by half the corresponding axis's range).  4
> buttons, which could each be labelled with double arrows, for scaling the x/y
> axes (scaling by factors of 2 and 0.5, about the axis's initial position).  3
> buttons for toggling linear/log scale on each axis (these are in the current
> view editor).  3 more buttons, for resetting the view to default, for retaining
> the current view and for reverting to a previously retained view.

This does not sound like something I can do in 5 minutes, maybe Joe Chuma would take
this on?

>   We would also like to be able to attach markers to a histogram (requiring
> another button to remove markers).  markers would be placed using mouse clicks
> on the histogram, *and* by a text entry box for typing channel numbers.  Markers
> would be labelled with x,y.  There would then be a button to expand an axis
> between the last 2 placed markers.  The markers would also be used for analysis
> such as integral and peakfind/fitting.

Maybe I am missing something, but is this not "standard root" functionality, using
the pad editor and adding "TLabels"?

>   The view manipulation toolbar would be one per canvas, so there would also
> need to be a toggle button to apply the view manipulation commands to all the
> histograms on that canvas, or to just the currently selected histogram[s] (a way
> to select several, rather than just one, histograms would be useful)

I like this: a control for selecting if the action is applied to just one histogram
or to all histograms in a group.

>    This would be very much quicker and easier to use than selecting items from
> long menus, which themselves need to be called by selecting specific, often very
> small, regions of a canvas.

I see: ROOT is geared very much for manipulating ONE graphical object at a time. We
want to manipulate MANY identical objects at the same time and the existing tools
are inadequate, for example because each object is physically very small and it is
hard to point-and-click it.

K.O.