creating a line cursor in app designer

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David
David 2023-4-30
编辑： Adam Danz 2023-5-15
Hi!
assume I create a signal and show it over an UIiAxes in matlab app designer.
is there a way to create a retangle cursor or line cursor using the imaged.roi.rectangle object / imaged.roi.rectangle object ?
something like the next function:
https://www.mathworks.com/help/dsp/ref/cursormeasurementsconfiguration.html
a full code is needed, if is possible.
thanks
  2 个评论
Adam Danz
Adam Danz 2023-5-1
Could you elaborate on what you mean by cursor? Would the line/rectangle follow the mouse cursor?
David
David 2023-5-1
Yes, If we use rectangle, i want that only the vertical lines would be dragged after the mouse ). The same for 2 lines objects.

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回答（1 个）

Sachin
Sachin 2023-5-12
Hi
I understand that you want to create a line cursor for an app designer.
You can use the Callback function in MATLAB to achieve this. There are several callback functions in MATLAB uifigure that you can help you.
  1. WindorButtonMotionFcn – This callback function executes whenever the user moves the pointer within the UI figure.
  2. ButtonDownfcn - This callback executes whenever the user clicks on the mouse button
fig = uifigure();
gl = uigridlayout(fig,[2 2]);
ax = uiaxes(gl);
hline = line(ax, [5 5], ax.YLim, 'Color', 'r');
%
fig.WindowButtonMotionFcn = @(fig, eve) btnCb(fig, eve, ax, hline);
function btnCb(~, ~, ax_up, l_h)
x = ax_up.CurrentPoint(1, 1)
if (ax_up.XLim(1) < x) && (x < ax_up.XLim(2))
l_h.XData = [x,x];
end
end
Referring to this MATLAB Answer page might be helpful to you:
https://in.mathworks.com/matlabcentral/answers/603793-show-mouse-position-in-another-subplot
Hope this helps you

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