Create a Button in a figure which activates another function
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Actually I use the 'getpts' function a lot in one of my scripts since I need the user to specify some points in an image. Sometimes the image might have a big resolution, so it would be nice to zoom in before choosing the points (the original 'getpts' function doesn't allow zooming). I read on another forum about the idea to impement a button in the opened figure which starts 'getpts' upon pressing it. With this option the user can zoom into the part of the image where he/she wants to specify points. I wrote a function which does exactly what I want it to do, but there are no output arguments given by it. Can someone help me to spot my mistake and maybe give a solution to this problem.
Thanks
David
function [x,y] = getpts_zoom(pic_analyze)
% open preloaded picture
image(pic_analyze)
axis equal
% create button
button=uicontrol('style','push','Position',[20 20 100 50],'String','Get Points','Callback',@(x,y)buttonpress_getpoints);
% subfunction getpts
function [x,y] = buttonpress_getpoints
[x,y] = getpts;
end
end
回答（1 个）
function [x,y] = getpts_zoom(pic_analyze)
x = []; % Must be specified in the main workspace.
y = []; % Must be specified in the main workspace.
% Show picture
image(pic_analyze)
axis equal
% Create button:
uicontrol('style','push','Position',[20 20 100 50],'String','Get Points','Callback',@mynest);
% Nested function:
function mynest(~,~)
[x,y] = getpts();
end
waitfor(gcf)
end
Read about nested functions:
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2018-10-2
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