How can I add an associated variable to a point using the figure's data tip feature while hovering over the point with the mouse.

I'm making an App in App Designer that will allow the user to develop a flight plan given a set of predeterimed data collection lines. I would like the user to be able to select one of the graphed waypoints in a map where I used the function geoshow to map various points and the lines that connect them. Each of these points has a point name. To help the user find the point they want to select I would like to alter the curser data tip to include the point name when the user hovers over the point with the mouse. I have found a method to change the labels of the x and y in the data tip, but I can't seem to figure out how to pass information, such as the point name into the data tip.

I have tried the following in my code:

fig = gcf;

dcm_obj = datacursormode(fig);

set(dcm_obj,'UpdateFcn',@newTitle);

with an accompanying function:

function title = newTitle(empt,event_obj,waypoints)

% Get the position of the point being clicked on

pos = get(event_obj,'Position');

% Find point name for point

pointIndex = find(pos(1),waypoints.Lat);

name = waypoints.Name(pointIndex);

title = {[name];['Lattitude: ',num2str(pos(1))]; ['Longitude: ',num2str(pos(2))]};

end

But, Matlab does not actually pass the structure variable waypoints to the function newTitle using the @newTitle command in set().

Answer 1

[Harsha Priya Daggubati]

Hi,

You can pass additional variable waypoint to the newTitle function in 'set' method as follows:

set(dcm_obj,'UpdateFcn',{@newTitle,waypoints});

Hope this helps!