Dynamically reading cursor location

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I am using ginput to select a location within a plot. Is there a function that would allow me to access the current location of the cursor as I move it (before pressing the mouse) and display the coordinates, something like how the current lat/long of the cursor position are displayed on Google Earth?

Accepted Answer

Ameer Hamza
Ameer Hamza on 23 Jun 2020
You can use the WindowButtonMotionFcn callback of the figure object. Run the following example
fig = figure();
ax = axes(fig);
fig.WindowButtonMotionFcn = {@mouseMotionCB, ax};
function mouseMotionCB(fig, event, ax_handle)
fprintf('Current Point is %f %f %f\n', ax_handle.CurrentPoint(1,1:3));
end
  5 Comments
Ameer Hamza
Ameer Hamza on 25 Jun 2020
If you want to use ginput(), then an alternative solution is to use a timer() objects to detect the values. In this case, you do not need to double click the axes object.
fig = figure('Interruptible', 'off');
ax1 = subplot(1,2,1);
ax2 = subplot(1,2,2);
fig.WindowButtonMotionFcn = @(~,~) [];
t = timer('Period', 0.1, 'ExecutionMode', 'fixedRate', 'TimerFcn', {@mouseMotionCB, ax1, ax2});
start(t)
ginput(1)
stop(t);
delete(t);
function mouseMotionCB(fig, event, ax1, ax2)
currentPoint1 = ax1.CurrentPoint(1,1:3);
x1 = currentPoint1(1);
y1 = currentPoint1(2);
if (ax1.XLim(1)<x1)&&(x1<ax1.XLim(2)) && (ax1.YLim(1)<y1)&&(y1<ax1.YLim(2))
fprintf('This is axes 1, Current Point is %f %f %f\n', currentPoint1);
end
currentPoint2 = ax2.CurrentPoint(1,1:3);
x2 = currentPoint2(1);
y2 = currentPoint2(2);
if (ax2.XLim(1)<x2)&&(x2<ax2.XLim(2)) && (ax2.YLim(1)<y2)&&(y2<ax2.YLim(2))
fprintf('This is axes 2, Current Point is %f %f %f\n', currentPoint2);
end
end

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