ginput with right mouse button

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daniel
daniel 2014-3-25
评论： Image Analyst 2014-4-19
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

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采纳的回答

Image Analyst
Image Analyst 2014-3-25
If you have the Image Processing Toolbox, you can use impoint() instead of ginput().
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Joseph Cheng
Joseph Cheng 2014-3-27
See my second post to your question below about how to get the right click.
Image Analyst
Image Analyst 2014-4-19
Daniel, try getpts() instead of ginput:
grayImage = imread('cameraman.tif'); % Read the image into an array
imshow(grayImage); % Display the image
[x,y] = getpts

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更多回答（1 个）

Joseph Cheng
Joseph Cheng 2014-3-25
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.')
  2 个评论
Joseph Cheng
Joseph Cheng 2014-3-26
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''));');

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