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get line plot data just by mouse stay on it (without click)

Asked by Morteza on 27 Jan 2013

I plot my data and I need to show data (Y) in text box when I put the mouse cursor on it (without click), is there any fuction that help me?

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Morteza

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3 Answers

Answer by Teja Muppirala on 28 Jan 2013
Accepted answer

Here is a simple example that outlines how to do it using HITTEST.

function my_example
plot(rand(5));
set(gcf,'windowbuttonmotionfcn',@getcoords)
function getcoords(varargin)
this = hittest;
if strcmp(get(this,'type'),'line');
    cp = get(gca,'currentpoint');
    ht = title(num2str(cp([1 3])));
    set(ht,'color',get(this,'color'));
end

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Teja Muppirala
Answer by Walter Roberson on 28 Jan 2013

datacursormode() with a custom callback function that sends the coordinate to the edit box as well as displaying it on the screen.

1 Comment

Morteza on 28 Jan 2013

I knew that datacursormode can return current position mose on the figure, but it is require to call the function and the click on the screen to get result. In my plot just by move the mouse program should realize that current mouse position is on the line plot if you are already. I found a function like overobj2.m and put it in the function that is called by my program every secound to get data, but it just return only axes .....

Walter Roberson
Answer by Jan Simon on 28 Jan 2013

You can use the WindowsButtonMotion function of the parent figure. There OVEROBJ can check, if the mouse is over the specified axes and the CurrentPoint property of this axes contains the coordinates. Now you need a method to find the nearest (interpolated?) point of your data for the display.

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Jan Simon

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