function?varargout=spm_XYZreg_Ex2（varargin）
%?Example?of?Registry?enabled?XYZ?GUI?control?/?function
%?FORMAT...
%_______________________________________________________________________
%
%?Help?goes?here...
%
%?object?must?be?indentifiable?via?a?unique?HandleGraphics?object.
%?In?this?code?this?handle?is?called?hMe.
%
%?This?HandleGraphics?objects?‘UserData‘?*must*?be?a?structure.
%?The?structure?must?have?a?field?called?‘hReg‘?which?stores?the?handle
%?of?the?registry?when?linked?and?is?empty?when?not.?Some?utility?features
%?of?spm_XYZreg?will?set/delete?the?handle?directly...
%
%?There?must?be?a?‘SetCoords‘?function?for?this?object?with?call:
%???spm_res_ui（‘SetCoords‘xyzhMehC）
%?...this?can?handle?interna?co-ordinate?setting?（as?in?this?example）?but
%?must?also?call?the?registry.
%
%?The?registry?update?function?is:
%???spm_XYZreg（‘SetCoords‘xyzhReghMe）;
%?...which?must?be?called?at?all?points?where?the?local?co-ordinates?can?be
%?changed.?It?is?robust?to?invalid?or?empty?hReg.
%
%?It‘s?*vital*?to?specify?caller?handles?（hC）?so?that?the?registry?doesn‘t
%?end?up?in?an?infinite?loop?of?updating!
%
%?Hey?if?your?function?has?multiple?places?where?you?can?change?the?XYZ
%?you?could?use?an?‘‘internal‘‘?registry?locally?with?the?external?registry
%?as?one?of?it‘s?entries!?（I?think?）
%
%_______________________________________________________________________
%?Copyright?（C）?2008?Wellcome?Trust?Centre?for?Neuroimaging

%?Andrew?Holmes
%?$Id:?spm_XYZreg_Ex2.m?1143?2008-02-07?19:33:33Z?spm?$


%=======================================================================
switch?lower（varargin{1}）?case?‘create‘
%=======================================================================
%?hMe?=?spm_XYZreg_Ex2（‘Create‘MDxyz）
if?nargin<4?xyz=[0;0;0];?else?xyz=varargin{4};?end
if?nargin<3?error（‘Insufficient?arguments‘）?end
D?=?varargin{3};
M?=?varargin{2};

xyz?=?spm_XYZreg（‘RoundCoords‘xyzMD）;

F?=?figure;

%-Create?control:
%?-?note?the?UserData?structure:?hReg?is?necessary?for?cross-registration
%???M?D?&?xyz?are?used?internally...
%?-?note?how?the?DeleteFcn?closes?the?objects?figu