I want Matlab to execute a function that takes the specific point I clicked on as an input, so for example, if I plot
plot(xy(:,1),xy(:,2))
scatter(xy(:,1),xy(:,2))
and then click on a specific point (see figure), it will execute a callback function whose inputs are not only the x,y coordinate of that point but also its index value (ie its the 4th row of variable xy)
Thanks alot!
This can be done by using the ButtonDownFcn property of Scatter objects.
In the main script:
% --- Define your data
N = 10;
x = rand(N,1);
y = rand(N,1);
% --- Plot and define the callback
h = scatter(x, y, 'bo');
set(h, 'ButtonDownFcn', @myfun);
and in the function myfun:
function myfun(h, e)
% --- Get coordinates
x = get(h, 'XData');
y = get(h, 'YData');
% --- Get index of the clicked point
[~, i] = min((e.IntersectionPoint(1)-x).^2 + (e.IntersectionPoint(2)-y).^2);
% --- Do something
hold on
switch e.Button
case 1, col = 'r';
case 2, col = 'g';
case 3, col = 'b';
end
plot(x(i), y(i), '.', 'color', col);
i is the index of the clicked point, so x(i) and y(i) are the coordinates of the clicked point.
Amazingly enough, the mouse button which performed the action is stored in e.Button:
so you can play around with that too. Here is the result:
Best,
