MATLAB: Continuous tracking of ‘LocationChanged’ event of figure

figure eventlocationchanged

Hi,

I am trying to glue a (main) figure 1 to a (following) figure 2, so that when the user manually moves the main figure, the following figure moves with it. The intended effect is that they are side by side at every moment. By now, my strategy is to use a listener that listens to the 'LocationChanged' event of main figure and replaces figure 2 according to the changes notified by figure 1. The problem is that 'LocationChanged' seems to get notified only after the user has stopped moving the main figure. At this moment, figure 2 just jumps to the side of the main figure…. is there a way to ensure that the event 'LocationChanged' is issued continuously while the figure is being moved?

Best Answer

It seems to be firing and responding correctly for me (18a, Windows) as I drag fig1 around.

posOffset = [500 0]; % positional offset
fig1 = figure('Units','pixels','Position',[140 140 400 400]);
fig2 = figure('Units','pixels','Position',[fig1.Position(1:2)+posOffset 400 400]);
listener1 = event.listener(fig1, 'LocationChanged', @(~,~)set(fig2, 'Position', fig1.Position+[posOffset 0 0]));

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MATLAB: How to create a TEXT Handle Graphics object that I can move in a stand-alone application

Since the Edit plot tool is not available in stand-alone mode, you must manually write a MATLAB function that implements the capability to move the text in an axis.

function testMove
fig = figure;
ax = axes;
txt = gtext('This text is movable');
set(txt,'UserData', false);
set(txt,'Units',get(fig,'Units'));
set(txt,'ButtonDownFcn',{@activateMove, fig});
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%


function activateMove(hobj, eventdata, fig)
set(fig,'WindowButtonMotionFcn',{@moveTxtPosition, hobj});
set(fig,'WindowButtonDownFcn',{@openTxtPosition, hobj});
set(fig,'WindowButtonUpFcn',{@closeTxtPosition});
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
function openTxtPosition(fig, eventdata, hobj)
set(fig,'WindowButtonMotionFcn',{@moveTxtPosition, hobj})
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
function moveTxtPosition(fig, eventdata, hobj)
prevPos = get(fig,'UserData');
if isempty(prevPos)
      set(fig,'UserData',get(fig,'CurrentPoint'));
      return;
end
curPos = get(fig,'CurrentPoint');
posChange = curPos - prevPos;
txtPos = get(hobj,'pos');
set(hobj,'pos', [posChange + txtPos(1:2), 0]);
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
function closeTxtPosition(fig, eventdata, hobj)
set(fig, 'WindowButtonMotionFcn','');
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set(fig, 'WindowButtonUpFcn','');

MATLAB: How to eliminate “Edit Plot” arrow error in a copied figure

When you do allchild(figList(iOld)), you are copying everything. That includes the uicontrols and menu. That is the source of the error. If you only want to copy the graphics objects, you could do as follows (will copy only the 'axes' objects):

for ii = 1:10
    plot(rand(10,1));
end
% Get a list of all existing figures
figList = sort(get(0,'Children'));
for iOld = 1:length(figList)
    figOld = figList(iOld); % This is a figure to replace
        % Used later to make sure size of figure is correct
        posOld = get(figOld, 'pos'); 
        figNew = figure; % Make new figure
        % Used later to make figure appear at  
        % default horizontal position on screen
        posNew = get(figNew, 'pos'); 
        % Copy over lines (but not formatting)
        %Copy only the axes %This is the new bit
        kids = allchild(figList(iOld));
        type = get(kids,'Type');
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        copyobj(kids(idx),figNew); 
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        set(figNew, 'Name', get(figOld, 'Name'), ...
            'pos', [posNew(1:2) posOld(3:4)]);
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        close(figList(iOld));
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Best Answer

Related Solutions

MATLAB: How to create a TEXT Handle Graphics object that I can move in a stand-alone application

MATLAB: How to eliminate “Edit Plot” arrow error in a copied figure

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