How can I continuously get the mouse coordinates?

I'm trying to track the position of the mouse as it scrolls across the figure, so I need the coordinates relative to that figure's axes. The best I have so far is this:

    % code
    function [x, y] = mouseMove(hobject,eventdata)
        C = get(gca,'currentpoint');
        x = C(1);
        y = C(2);
    end

    axis equal;
    axis([-8,8,-7,18]);
    hold on;
    set(gcf,'WindowButtonMotionFcn',@mouseMove);

    while 1
        loc = get(gca, 'CurrentPoint');
        plot(loc(1), loc(2), 'r.', 'markersize', 15);
        pause(.03);
    end

However, even this only plots according to the mouse's x position (it plots a straight line, with both the x and y values of that line being equal to the mouse's relative x position). So I'm halfway there, but I'm not sure why the y value is equal to the x value all the time.

[Walter Roberson]

Note: Callbacks can only return values when the callbacks are used for filtering, such as position constraint "callbacks".

Answer 1

[Walter Roberson]

          plot(loc(1,1), loc(1,2), 'r.', 'markersize', 15);