ginput with right mouse button

hello, i would like to use apply ginput function in such way that the user will chose the amount of coordinates to save (left click) and when he decide to finish so he will click the right button on the mouse.

how do i apply this?

thanks

Answer 1

[Image Analyst]

If you have the Image Processing Toolbox, you can use impoint() instead of ginput().

[daniel]

Thanks for the quick answer, i checked the function help and i didn't find how to apply the desired mouse button. any lead?

thanks again.

[Image Analyst]

You can use ginput but it does not drop down a marker after you click a point so you're essentially doing it blind:

plot(1:9)
grid on;
uiwait(msgbox('Left click points.  Type Enter when done'));
[x,y] = ginput()
hold on;
plot(x,y, 'b+');

[daniel]

is there a way to use a loop which will runs until right click will press (this will be the flag which stops the loop), how do i define a variable which get as input the right mouse click (mouse callback)?

thanks.

[Joseph Cheng]

See my second post to your question below about how to get the right click.

[Image Analyst]

Daniel, try getpts() instead of ginput:

grayImage = imread('cameraman.tif');  % Read the image into an array
imshow(grayImage);  % Display the image 
[x,y] = getpts

Answer 2

[Joseph Cheng]

I do not know if ginput will let you use the right mouse button the way you want. But you can go with something like this. which will select the range of points with the left click. Perhaps a prompt to say these are the points you select, are you sure?

t=1:100;plotDATA = rand(1,100);
figure,plot(t,plotDATA)
[x,y] = ginput(2);
x = sortrows(x);
sectiont = t(ceil(x(1)):floor(x(2)));
sectionData = plotDATA(ceil(x(1)):floor(x(2)));
hold on, plot(sectiont,sectionData,'r.')

[Joseph Cheng]

Thinking about it more, to get the right click to finalize the selection of points you can use

set(gcf,'WindowButtonDownFcn', yourfunctionhere);

Write a function that uses get(gcf,'SelectionType') which will detect whether it is a left, right, or middle click. Filter for right click with a switch statement that will store or return the points selected by Image Analyst method.

1. normal: left mouse button
2. extend: right mouse button on a 2-button mouse; middle mouse button on a 3-button mouse
3. alt: left+right buttons on a 2-button mouse; right mouse button on a 3-button mouse
4. open:double mouse click

an example of this function working and detecting what mouse button is pressed:

figure,plot(1:100);
set(gcf,'WindowButtonDownFcn', 'disp(get(gcf,''SelectionType''));');

[daniel]

Thanks!