# How to detect left mouse clicks within an area of an image

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ErikJon Pérez Mardaras le 18 Juil 2021
Hi everyone,
I am trying to display an image and what I want to do is to record in the variable h if the user clicks within an area of the image (h=1 if the users clicks within that area and h=0 if not) and save in the variable n the number of left-mouse clicks that the user makes within that area.
The image is immage.png and the three points that determine the "area" commented above are: pointA, pointB and pointC
I have the following code:
h=0;
n=0;
imshow('immage.png')
axis off
hold on
pointA=[200,145];
pointB=[210,159];
pointC=[300,162];
plot(pointA(1),pointA(2),'ro');
plot(pointB(1),pointB(2),'ro');
plot(pointC(1),pointC(2),'ro');
Which results in the following:
How can I achieve that? I have been searching but I didn`t find anything
Thank you very much
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### Réponse acceptée

Image Analyst le 18 Juil 2021
Did youi try to use drawpoint()?
Try my attached demo that counts the number of points a user clicks on.
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ErikJon Pérez Mardaras le 18 Juil 2021
Thank you! It is very useful
But is there any way of doing that without "drawing" in the image the point where the user clicks?
Is there any way of just updating the variable h and n but without appearing in the image any drawing of the dot?
Thank you very much
ErikJon Pérez Mardaras le 18 Juil 2021
Thank you very much
It can be done like that:
p=drawpoint('Visible','off');

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