[Chimera-users] mouse selection problem

Eric Pettersen pett at cgl.ucsf.edu
Wed Aug 6 10:08:10 PDT 2008

Meikel Diepholz wrote:
> Hi,
> just a small problem I hope.
> When I am selecting residues with ctrl +left mouse
> button, chimera is always replacing the earlier selection,
> independent on the selection mode I chose (append, subtract).
> Is it possible to change this?

Hi Meikel,
	This behavior isn't a bug per se, but rather a deliberate design  
decision.  We decided to not have the mouse selection honor the  
selection mode since it is possible to emulate all the selection modes  
directly with the mouse (except for intersect).  If you hold down the  
Shift key as you are making a mouse selection then everything chosen  
with the mouse will have it's selection state toggled (selected items  
become unselected and vice versa), and other items will not have their  
selection state changed.  So you can "subtract" by shift-control  
clicking/dragging on selected items, and you can "append" by shift- 
control clicking/dragging on unselected items.


                         Eric Pettersen
                         UCSF Computer Graphics Lab

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