Getting no results from a mouse click when using ButtonDownFcn with imshow

2 次查看（过去 30 天）

jack feinberg 2019-3-16

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/450360-getting-no-results-from-a-mouse-click-when-using-buttondownfcn-with-imshow

评论： Jan 2019-3-19

I'm unable to obtain (x,y) coordinates of an image using a mouse click with "imshow". I can do it with "image" but not with "imshow", and I need "imshow". I've seen lots of other posts on this issue, but none of their solutions seem to work, or the discussion is too technical for me.

I have 4 images arranged two by two, and I'm interested in clicking only on the image in subplot (2,2,3). But when I click nothing happens. Apparantly my function "clicky4" is not being called. Here's the relevant section of code:

global x y
.........
Image = single(rgb2gray(FilterRGBImage));
subplot(2, 2, 3);
vv = imshow(Image,'InitialMagnification', 'Fit');
set(vv, 'HitTest','off','PickableParts','none');
% Try to use the mouse to select a pixel
 set(gca,'ButtonDownFcn', @clicky4)

And here is my function "clicky4":

function clicky4(gcbo,eventdata,handles)
%This function is supposed to grab the position (x,y) of the mouse upon a click
global x y
v = get(gca,'Currentpoint');
hold on
x = v(1,1);
y = v(1,2);
end

Any suggestions will be much appreciated. I'm a relative beginner at this stuff....

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

回答（1 个）

Image Analyst 2019-3-16

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/450360-getting-no-results-from-a-mouse-click-when-using-buttondownfcn-with-imshow#answer_365650

Would ginput(1) or impixelinfo help you?

8 个评论
显示 6更早的评论隐藏 6更早的评论

jack feinberg 2019-3-17

Yup. That was the problem; my @function was stored inthe wrong location. A beginner's mistake! Thanks. It all works now!

Jan 2019-3-19

@jack feinberg: Please use flags only to inform admins and editors about contents, which might conflict with the terms of use, but not to post a comment. Thanks.

请先登录，再进行评论。

请先登录，再回答此问题。