Dynamically reading cursor location

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Ranjan Sonalkar 2020-6-23

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https://ww2.mathworks.cn/matlabcentral/answers/553327-dynamically-reading-cursor-location

评论： Ameer Hamza 2020-6-25

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?

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Answer 1

Ameer Hamza 2020-6-23

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https://ww2.mathworks.cn/matlabcentral/answers/553327-dynamically-reading-cursor-location#answer_455908

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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

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Ranjan Sonalkar 2020-6-24

编辑：Ranjan Sonalkar 2020-6-24

I put in a call to waitforbuttonpress just prior to ginput. So, now the mouse position shows dynamically up as the cursor is moved. When the user finds the desired location on the scale, a double-click of the mouse (first to resume after the waitforbuttonpress call, and the second as a response to ginput at the desired location) appeears to be the acceptable solution.

Ameer Hamza 2020-6-25

在 MATLAB Online 中打开

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