MATLAB: How to obtain the coordinates of the mouse on the screen displayed somewhere in the figure window

axesaxiscoordinatecoordinatesfigureimageMATLABmousetrack;

I would like to obtain the coordinates of the mouse on the screen displayed somewhere in my figure window.

Best Answer

This enhancement has been incorporated in MATLAB 7.5 (R2007b).

As a workaround in previous MATLAB releases, you can use the following MATLAB function to track mouse motion:

function mousetrk
%MOUSETRK function to track mouse motion
% This function creates two static text controls
% which contain the x & y coordinates of the mouse
% The driving callback is executed by the
% WindowButtonMotionFcn of the figure.
figure
axes('Visible','off')
xbox = uicontrol('Style','text','Tag','xbox');
xboxlabel = uicontrol('Style','text','String','X Value',...
    'Position',get(xbox,'position')+[0 21 0 0]);
ybox = uicontrol('Style','text','Position',[90 20 60 20],'Tag','ybox');
yboxlabel = uicontrol('Style','text','String','Y Value',...
    'Position',get(ybox,'position')+[0 21 0 0]);
callback = ['pt = get(gca,''CurrentPoint'');'...
  'xbox = findobj(''Tag'',''xbox'');' ...
  'ybox = findobj(''Tag'',''ybox'');' ...
  'set(xbox,''String'',num2str(pt(1,1)));' ...
  'set(ybox,''String'',num2str(pt(1,2)));'];
set(gcf,'WindowButtonMotionFcn',callback);

For more information on the WindowButton functions, please refer to the Handle Graphics Property Browser:

https://www.mathworks.com/help/releases/R2009b/techdoc/infotool/hgprop/doc_frame.html

Related Solutions

MATLAB: How to override the zoom uicontextmenu with a custom uicontextmenu, when in zoom mode, in MATLAB 7.3 (R2006b)

This can be accomplished with the zoom accessor object. The following example illustartes how this can be done:

% Define the context menu
cmenu = uicontextmenu;
% Define the line and associate it with the context menu
hline = plot(1:10,'UIContextMenu', cmenu);
% Define callbacks for context menu items
cb1 = ['set(hline, ''LineStyle'', ''--'')'];
cb2 = ['set(hline, ''LineStyle'', '':'')'];
cb3 = ['set(hline, ''LineStyle'', ''-'')'];
% Define the context menu items
item1 = uimenu(cmenu, 'Label', 'dashed', 'Callback', cb1);
item2 = uimenu(cmenu, 'Label', 'dotted', 'Callback', cb2);
item3 = uimenu(cmenu, 'Label', 'solid', 'Callback', cb3);
% Get the handle to the zoom mode object for the figure
zh = zoom(gcf);
% Set the UI Context Menu to the custom menu
set(zh, 'uicontextmenu', cmenu)

MATLAB: How to create an encrypted password in MATLAB

Currently, you cannot have letters or numbers appear as particular characters in MATLAB. This has been forwarded to our development staff to be considered for a future version of MATLAB.

Please consider the following workarounds:

1. Use an ActiveX control

2. Set the foreground color to be the same as the background color, the typing will not be visible.

h = uicontrol('Style','Edit','ForeGroundColor',[.75 .75 .75]);

3. Use a font that does not appear as normal letters.

h = uicontrol('Style','Edit','Fontname','symbol');

4. A file exchange submission that replaces the characters typed with asterisks can be found in the following link:

http://www.mathworks.com/matlabcentral/fileexchange/8499-login

Also, keep in mind if you are creating an application that will be used on a number of different platforms you will need to use a font name particular for each platform.

See the following as a possible MATLAB code workaround:

function passwd_test
u = uicontrol('style','edit','enable','inactive','backgroundcolor','w',...
    'units','norm',...
    'position',[.1 .1 .5 .1],...
    'tag','edit')
u = uicontrol('style','text','enable','inactive','backgroundcolor','w',...
    'units','norm',...
    'position',[.1 .25 .5 .1],...
    'tag','text')
set(gcf,'keypressfcn', {@handle_passwd})
function handle_passwd(h,eventData)
CK = get(gcf,'currentkey');
h_disp = findobj(gcbf,'tag','text');
h_asterix = findobj(gcbf,'tag','edit');
if gco == h_asterix,
    str = get(h_disp,'string');
      if strcmp(CK,'backspace'),
          % Do something here if the backspace key was pressed
          if length(str) > 1,
              str = str(1:end-1);
          end
      elseif strcmp(CK,'space')
          str = [str,' '];
      else
          str = [str,CK];
      end
      set(h_disp,'string',str);
      set(h_asterix,'string',char(ones(1,length(str))*double('*')));
  end

Best Answer

Related Solutions

MATLAB: How to override the zoom uicontextmenu with a custom uicontextmenu, when in zoom mode, in MATLAB 7.3 (R2006b)

MATLAB: How to create an encrypted password in MATLAB

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