How to show the position of your mouse in a GUI that has two Axes?

Question

Meshooo 2016-2-8

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/267117-how-to-show-the-position-of-your-mouse-in-a-gui-that-has-two-axes

评论： Adam Danz 2020-6-16

采纳的回答： Walter Roberson

在 MATLAB Online 中打开

Dear all,

I have a GUI that has two axes, Main_Axes and Side_Axes.

Now I want when mouse is over a point in the Main_Axes, it will show the same position of the mouse in the Side_Axes.

So I made a function that I called 'mouseMove', that start * the mouse position

function mouseMove (object, eventdata)
C = get (gca, 'CurrentPoint');
X = C(1,1);
Y = C(1,2);
I = getimage;
hold on
plot(X, Y, 'y*')
hold off

Now in the callback I add this code

set(handles.Main_Axes,'HandleVisibility','ON');
set(handles.Side_Axes,'HandleVisibility','OFF');
imshow(I)  % to show 'I' in the Main_Axes
axes(handles.Side_Axes)
set (gca, 'WindowButtonMotionFcn', @mouseMove);

This makes the yellow star always appear in the Main_Axes, but it should appear in the Side_Axes.

Any idea how to fix that?

Meshoo

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Answer 1

Walter Roberson 2016-2-9

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https://ww2.mathworks.cn/matlabcentral/answers/267117-how-to-show-the-position-of-your-mouse-in-a-gui-that-has-two-axes#answer_209083

在 MATLAB Online 中打开

set (gca, 'WindowButtonMotionFcn', {@mouseMove, handles});
function mouseMove(object, eventdata, handles)
    if ~isfield(handles, 'side_pointer') || ~ishandle(handles.side_pointer)
      pointersize = 30;
      handles.side_pointer = scatter(nan, nan, pointersize, 'y', 'Marker', '*');
      guidata(object, handles);
    end
    C = get(handles.Main_Axes, 'CurrentPoint');
    x = C(1,1); y = C(1,2);
    %move the cursor
    set(handles.side_pointer, 'XData', x, 'YData', y);
    %zoom around the cursor
    zoomwidth = 64;
    xleft = max(0, x-zoomwidth/2);
    ybot = max(0, y-zoomwidth/2);
    set(handles.Side_Axes, 'XLim', [xleft xleft+zoomwidth], 'YLim', [ybot ybot+zoomwidth]);
    drawnow();

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Meshooo 2016-2-9

That's work well. Thank you very much.

Adam Danz 2020-6-16

在 MATLAB Online 中打开

If I'm not mistaken, I think that first line should be

set(gcf, . . . )

WindowButtonMotionFcn is a figure property.

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Answer 2

John BG 2016-2-8

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https://ww2.mathworks.cn/matlabcentral/answers/267117-how-to-show-the-position-of-your-mouse-in-a-gui-that-has-two-axes#answer_208992

Hi Meshoo

have a look to http://uk.mathworks.com/matlabcentral/fileexchange/33107-mouse-position?s_tid=srchtitle

may be you can modify GetMousePosition.m to achive

'when mouse is over a point in the Main_Axes, it will show the same position of the mouse in the Side_Axes.'

what is the purpose of doing so?

John jgb2012@sky.com

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Meshooo 2016-2-9

Thank you for the link. I didn't explain the purpose from that because I don't want to make it more complicated. So the idea is to show a zoom in the Side_Axes of the same point where the mouse is over in the Main_Axes. This will help the user to see more details in the Side_Axes.

Do you know any one tried to do similar thing?

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